Tim Mason, E.H. Majzoub Center for Nanoscience, Department of Physics and Astronomy University of Missouri, St. Louis, MO Advisor: Eric Majzoub
|
|
- George Wilkerson
- 6 years ago
- Views:
Transcription
1 First-principles Study of Novel Conversion Reactions for High-capacity Li-ion Battery Anodes Tim Mason, E.H. Majzoub Center for Nanoscience, Department of Physics and Astronomy University of Missouri, St. Louis, MO Advisor: Eric Majzoub Abstract Anodes for Li-ion batteries are primarily carbon-based due to their low cost and long cycle life. However, improvements to the Li capacity of carbon anodes, LiC6 in particular, are necessary to obtain a larger energy density. Stateof-the-art light-metal hydrides for hydrogen storage applications often contain Li and involve reactions requiring Li transport, and light-metal ionic hydrides are candidates for novel conversion materials. Given a set of known solid-state and gas-phase reactants, we have determined the phase diagram in the Li-Mg-B-N-H system in the grand canonical ensemble, as a function of lithium chemical potential. Our model includes vibrational contributions to the total free energy to obtain finite temperature results. We present computational results for four new conversion reactions that are thermodynamically favorable that do not involve gas evolution. Introduction The demand for improved performance of lithium ion batteries for current applications as well as the need for improved kinetics for possible vehicular applications warrants the continued search for potential new battery materials. While current batteries are based on the Li intersertion/de-insertion process in carbon anodes, greater capacity has been shown to be possible through conversion reactions. Specifically, Oumellal et el have demonstrated the potential of an MgH 2 cathode that lithiates into Mg and LiH versus a metal lithium anode offering a capacity of 1,480 mahg -1 with an average voltage of 0.5V. Conversion reaction materials as they exist today have some problematic features. Oumellal s MgH 2 cathode for example experiences dramatically degraded reversibility after less than 20 cycles which is suspected to be due largely in part to fracturing that occurs during the large volume expansion of approximately 85% that accompanies the conversion reaction[1]. Such poor reversibility tends to cast a pessimistic cloud over these types of electrodes. Silicon anodes are another example of an otherwise promising material foiled by large volume expansions (400%) leading to heavy capacity fade from cracking and disintegration of the anode. One attempt to overcome this was the use of silicon compounds containing inactive host matrices such as CaSi 2 which performed for 10 cycles at a capacity of 1500mAhg -1 but then fell to 310mAhg -1. It is thought that this degradation was due to the alloys inability to sustain the large volume changes[4]. This suggests that there may still be hope in searching for novel conversion reaction materials with high theoretical capacities but smaller changes in volume upon conversion. Useful thermodynamic models that utilize first principles total energy calculations performed on the full set of possible compounds have the potential to aid in the effort to understand and predict the reactions that might occur within a system of any given atomic composition. Recent hydrogen storage work has led to intense exploration of compounds and their structures in the Li-Mg-B-N-H system. We leverage the results of that work using a new linear programming based lithium ion battery model to explore the usefulness of the Li-Mg- B-N-H system as an anode material. In the realm of complex compounds, these models can be useful for searching the composition space for possible conversion materials where intuition may fail. We present a simple model for a lithium ion battery based on the linear programming approach recently developed by Akbarzadeh et al[2] that was used to accurately predict hydrogen storage reactions within the Li- Mg-N-H system by minimizing the grand canonical free energy. In this case, phase diagrams were determined
2 as a function of temperature and H 2 pressure. We use the same Grand canonical scheme but replace the chemical potential of hydrogen gas with the electrochemical potential of the lithium ions as a battery s voltage is varied from a charged to a discharged state. This results in a five dimensional phase space with one axis for the atomic quantities of magnesium, boron, nitrogen, and hydrogen plus one axis for the lithium electrochemical potential (i.e. the voltage). We show that our model reproduces the findings of Oumellal et al[1] from their MgH 2 lithium ion battery cathode experiment and also predicts four noteworthy reactions with very high lithium density by mass. We have also demonstrated that this method may be used for searching any number of complex systems for potential battery materials. Computational methods In order to determine the competing phases present at equilibrium at a given temperature and lithium chemical potential, we follow the method of Akbarzadeh et al[2] in which the canonical Gibbs free energy is minimized while, in our case, the lithium chemical potential varies up to a potential corresponding to plating of metallic Li at the anode. The method described below examines only the thermodynamics of the system and does not address kinetic mechanisms or their influence on reaction rates. We consider a lithium-ion battery in which the anode and cathode are separately modeled as simultaneous systems defined by the quantity of each species of atoms present. The total number of atoms in each electrode is conserved with the exception of lithium, which is permitted to flow between the two electrodes and is thus jointly conserved between anode and cathode. In each electrode, the atoms are distributed among a set of possible phases such that the total Gibbs free energy of the battery (Eq. 1) is minimized. F a and F c are the free energies per formula unit for the anode and cathode phases, x a and x c are the unknown molar fractions of those phases, and n c Lic is the lithium count per formula unit in phase c of the cathode. The first and second terms in Eq. 1 describe the cohesive energies of all existing phases present in the anode and cathode, respectively, and the third term describes the energy due to the chemical potential of lithium ions. The Gibbs free energy is minimized subject to the atomic quantity constraints in Eqs Where A s and C s are the total quantity of non-li species s in the anode and cathode respectively, and L is the total Li count in both the anode and the cathode. Equation 4 conserves the total amount of lithium but allows it to flow between the anode and the cathode. Minimizing the free energy at varying lithium electrochemical potentials subject to the linear constraints constitutes a linear programming problem. The Gnu Linear Programming Kit (GLPK) package in the open source numerical software package Octave was used to solve for
3 the molar fractions of each phase in the electrodes. For each set of atomic constraints, we raise the electrochemical potential of the anode Li atoms from -5 to 5 ev, representing a voltage swing of -5 to 5 volts. For small voltage steps, changes in molar fractions can be interpreted as a conversion reaction that gains or loses Li. We scan the composition space (the multi-component phase diagram) to search for mass ratios that result in suitable reversible conversion reactions. In this study, anode material in the Li-Mg-B-N-H system was scanned for reversible reactions involving Li insertion/extraction that do not result in the creation of gases (e.g. N 2, H 2, or NH 3 ) as byproducts. The cathode is modeled with only two possible phases, unlithiated FePO 4 and lithiated LiFePO 4. This is a well-understood cathode material, and it simply provides a familiar reference energy. The phase space of the Li-Mg-N-B-H system is explored by determining the molar fractions of competing phases for each point on a grid of atomic quantities A s that samples the quaternary phase space of Mg-N-B-H within predetermined boundaries. It is only necessary to supply enough lithium to saturate the anode materials in a charged state and therefore the quantity L in equation 4 need not be varied. The calculation on each point on the quaternary composition space results in a set of reactions that occur as the electro-chemical potential of lithium is varied. An array was used to sample 8 4 points in the phase space over the range shown in Table 1. Table 1. Boundaries of the explored space of atomic quantities A s Element Minimum Maximum Mg 0 4 B 0 4 N 0 6 H 0 15 First-principles DFT calculations using the VASP package were performed to obtain static free energies for the candidate anode compounds in the Li-Mg-N-B-H system shown in Table 2. The static energies were calculated using the Vienna Ab-initio Simulation Package (VASP) code. [9,10,11,12] The projector augmented wave method was used for the interaction between conduction electrons and the ion cores, [7,8]in combination with the correlation-exchange functional of Perdew and Wang.[13,14] We employed a plane wave energy cutoff of 600 ev and Monkhorst-Pack k-point meshes of or larger. All structural parameters we relaxed until the forces on the ions were below 5 ev/å and stresses were below 0.1 GPa. Gamma phonons modes were also calculated using VASP s linear response capability in order to calculate vibrational contributions to the free energies at 300K and 1000K. The number of supercells used for each compound is listed in table 2. Table 2. First-principles static DFT energies and enthalpies of formation for the anode and cathode phases Phase Vasp energy (ev/fu) H of formation (kj/mol*fu) Zero_point (kj/mol*fu) 300K vib (kj/mol*fu) Volume/f.u. Unit cells for phonon calculation Li x 2 x 2
4 H N/A 1 x 1 x 1 N N/A 1 x 1 x 1 Mg x 2 x 2 B-alpha x 1 x 1 NH N/A 1 x 1 x 1 LiH x 1 x 1 LiNH x 1 x 1 Li 2 NH x 1 x 1 Li 4 NH x 1 x 1 Li 4 BN 3 H x 1 x 1 Li 3 BN 2 H x 1 x 1 Li 2 BNH x 1 x 1 Li 3 N x 2 x 2 LiN x 1 x 1 LiBH x 1 x 1 LiMgH x 1 x 1 LiMgN x 1 x 1 LiMgBN x 1 x 1 Li 3 BN x 1 x 1 Li 2 Mg(NH) x 1 x 1 Li 2 Mg 2 (NH) x 1 x 1 Mg(NH 2 ) x 1 x 1 MgB 2 H x 1 x 1 MgNH x 1 x 1 MgH x 1 x 1 Mg 3 N x 1 x 1 FePO N/A N/A N/A N/A N/A LiFePO N/A N/A N/A N/A N/A. Battery electrodes often operate far from equilibrium, and formation of metastable phases in the Li-Mg-N-B-H system may therefore be possible. Some compounds resulted in unstable phonon modes. In the case of Li3N, there is a single unstable phonon. Yan and Zhang report that the B 2g mode at slightly smaller volumes [6] and the mode in the present work stabilizes with increased volume suggesting that the mode may be a result of the harmonic approximation. Soft modes were also found in Mg 3 N 2, Mg(NH 2 ) 2 and Li 4 BN 3 H 10. In the case of Mg 3 N 2 these modes disappeared when the VASP Mg PAW pseudopotential was replaced with the the Mg_pv in which the P core electrons are treated as valence indicating that some instabilities are due to the frozen core approximation. Results and discussion The results indicate four very interesting reactions as shown in Table 3. All of the anode reactions are theoretically reversible, emit no gas and possess a high mass percentage of lithium with respect to LiC 6.
5 Reaction 1 and reaction 4 are particularly worthy of note for their simplicity in product end points and their lithium mass content. Changes in volume of up to 400% in silicon-lithium alloy systems after charging are known to cause cracking and disintegration to a silicon anode leading to heavy capacity fade with capacities well below that of LiC 6 after 5 or more charge cycles[4]. This is the primary barrier to usage of the otherwise promising silicon system, and it is worth comparing the theoretical changes in volume of our four reactions listed in Table 3. The largest expansion occurs in reaction 1 where the volume increases by about 100%, which still compares favorably with silicon. Reaction 2 expands by a smaller 75% but is rendered less competitive by its smaller lithium capacity. Reactions 3 and 4 show Table 3. Reactions at 300K Mg=1; B=0; N=2; H=4 Discharged state: Mg(NH 2 ) 2 (50 wt.% Li) µ Li (V) Volume increase Mg(NH 2 ) 2 2 LiH + Li 2 Mg(NH) 2 Li 2 MG(NH) LiH Li 2 NH Mg 3 N Li 2 NH 1.33 LiH Li 3 N Final lithiated anode: 4 LiH Li 3 N Mg 3 N 2 Mg=1; B=2; N=2; H=4 (38 wt.% Li) Discharged state: 2 B, 1 Mg(NH 2 ) 2 2 B + Mg(NH 2 ) 2 LiBH 4 + LiMgBN 2 LiBH 4 4 LiH + B LiMgBN 2 Mg + Li 3 BN 2 Final lithiated anode: 4 LiH, 1 B, Mg, Li 3 BN 2 Mg=5; B=8; N=2; H=36 (50 wt.% Li) Discharged state: Mg(NH 2 ) 2, 4 MgB 2 H 8 Mg(NH 2 ) MgB 2 H 8 7 LiBH 4 + LiMgBN 2 +4 MgH 2 7 LiBH MgH 2 4 Mg + 7 B +36 LiH LiMgBN2 Mg + Li 3 BN 2 Final lithiated anode: 36 LiH + 1 Li 3 BN B + 5 Mg Mg=1; B=2; H=8 (51 wt.% Li) Discharged state: MgB 2 H 8 MgB 2 H B LiBH4 + 1 MgH2 0.5B + MgH2 Mg +0.5 LiBH4 2 LiBH 4 8 LiH +2 B Final lithiated anode: 8 LiH, 2 B, Mg % 51% 100% 39% 57% 75% 5% 48% 51% -0.5% 13% 45%
6 comparable performance. While reaction 4 performs better on volume expansion, reaction 3 represents higher energy density due to the 3.4 volt reaction compared with 3.0 volts reaction 4. Remarkably, the first lithiation step in systems 3, and 4, with potentials of 2.6 and 2.9 volts, have very low volume increases of 4% and 13%, respectively. This is significantly lower than the volume expansion in silicon and the MgH 2 anode. In order to reduce tensile stresses upon volume expansion in silicon-based anodes, silicon is dispersed in matrix of hard, low-ductility Si 3 N 4. This greatly enhances reversibility but reduces capacity to 83 mahg -1.[4] If perhaps the loss of capacity is due to the inability of the silicon to expand as required to absorb lithium in the hard matrix, then this technique may work better with the reactions in this paper which require far less expansion. While Silicon nano-wires have successfully been employed to overcome the fracturing problems with Li-Si alloys,[5] one would expect that the empty space between each nano-wire would cause the capacity per unit volume of these batteries to be very poor. If the Si 3 N 4 can be shown to be effective with these novel materials, then they may make for more compact batteries while still delivering a significant improvement on galvanometric energy capacity far beyond what current cathode technologies can support[5]. Deleted: Conclusions In conclusion we have proposed a new method of searching complex conversion materials for reversible lithium ion batteries. Our study identifies four anode materials. The single phase anodes, (1) Mg(NH 2 ) 2 and (2) Mg(BH 4 ) 2, and two anodes consisting of mixtures (3) 4 Mg(BH 4 ) 2 + Mg(NH 2 ) 2, and (4) 2 B + Mg(NH 2 ) 2. All of them have volume expansions of 100% or less on lithium insersion, making them promising versus silicon. Additionally, (2) and (3) show volume increases of only 50%. Acknowledgements The authors would like to thank the Boeing Company for sponsoring the author s (T.H. Mason) tuition for this research. Biography: Tim Mason is a graduate student in physics at University of Missouri St. Louis References 1. Y Oumellal, A Rougier, GA Nazri, JM Tarascon, et al. Nature Materials, Vol. 7: (2008) 2. Alireza R. Akbarzadeh, Vidvuds Ozolins, and Christopher Wolverton. Advanced Materials, 19: ,( 2007) 3. J.H. Ryu, J.W. Kim, Y.-E. Sung and S.M. Oh, Electrochem. Solid State Lett. 7 (2004), p. A U. Kasavajjula, C. Wang, A. J. Appleby, Journal of Power Sources, 163, issue 2, Jan (2007), pp Candace K. Chan and Halin Peng et al.. Nature Nanotechnology, 3:31-35, (2007). 6. Y. Yan, J.Y. Zhang et al. The European Physical Journal B Condensed Matter and Complex Systems, 61, Number , (2008) 7. P.E. Blöchl, Phys. Rev. B, 50, (1994). 8. G. Kresse, and J. Joubert,Phys. Rev. B,59, 1758 (1999). 9. G. Kresse and J. Hafner. Phys. Rev. B, 47:558, (1993). 10. G. Kresse and J. Hafner. Phys. Rev. B, 49:14251, (1994). 11. G. Kresse and J. Furthmüller. Comput. Mat. Sci., 6:15,(1996). 12. G. Kresse and J. Furthmüller. Phys. Rev. B, 54:11169,( 1996). 13. J.P. Perdew, J.A. Chevary, S.H. Vosko, K.A. Jackson, M.R. Pederson, D.J. Singh, and C. Fiolhais. Phys. Rev. B, 46:6671, (1992). 14. J.P. Perdew, J.A. Chevary, S.H. Vosko, K.A. Jackson, M.R. Pederson, D.J. Singh, and C. Fiolhais. Erratum:Phys. Rev. B, 48:4978, (1993).
Anion-redox nanolithia cathodes for Li-ion batteries
ARTICLE NUMBER: 16111 Anion-redox nanolithia cathodes for Li-ion batteries Zhi Zhu 1,2, Akihiro Kushima 1,2, Zongyou Yin 1,2, Lu Qi 3 *, Khalil Amine 4, Jun Lu 4 * and Ju Li 1,2 * 1 Department of Nuclear
More informationSupporting Information
Electronic Supplementary Material (ESI) for Energy & Environmental Science. This journal is The Royal Society of Chemistry 2015 Supporting Information Pyrite FeS 2 for High-rate and Long-life Rechargeable
More informationSupporting Information Towards N-doped graphene via solvothermal synthesis
Supporting Information Towards N-doped graphene via solvothermal synthesis Dehui Deng1, Xiulian Pan1*, Liang Yu1, Yi Cui1, Yeping Jiang2, Jing Qi3, Wei-Xue Li1, Qiang Fu1, Xucun Ma2, Qikun Xue2, Gongquan
More informationAdsorption and Diffusion of Lithium on MoS 2 Monolayer: The Role of Strain and Concentration
Int. J. Electrochem. Sci., 8 (2013) 2196-2203 International Journal of ELECTROCHEMICAL SCIENCE www.electrochemsci.org Adsorption and Diffusion of Lithium on MoS 2 Monolayer: The Role of Strain and Concentration
More informationOrigin of low sodium capacity in graphite and generally weak substrate binding of Na and Mg among alkali and alkaline-earth metals
Classification: Physical Sciences: Applied Physical Sciences Origin of low sodium capacity in graphite and generally weak substrate binding of Na and Mg among alkali and alkaline-earth metals Yuanyue Liu,
More informationSupporting information. The Unusual and the Expected in the Si/C Phase Diagram. Guoying Gao, N. W. Ashcroft and Roald Hoffmann.
Supporting information The Unusual and the Expected in the Si/C Phase Diagram Guoying Gao, N. W. Ashcroft and Roald Hoffmann Table of Contents Computational Methods...S1 Hypothetical Structures for Si
More informationElectronic Supplementary Information
Electronic Supplementary Information Stable cycling of lithium sulfide cathodes through strong affinity with a bifunctional binder Zhi Wei Seh, Qianfan Zhang, Weiyang Li, Guangyuan Zheng, Hongbin Yao,
More informationMolybdenum compound MoP as an efficient. electrocatalyst for hydrogen evolution reaction
Electronic Supplementary Material (ESI) for Energy & Environmental Science. This journal is The Royal Society of Chemistry 2014 Molybdenum compound MoP as an efficient electrocatalyst for hydrogen evolution
More informationYali Liu, Pengfei Zhang, Junmin Liu, Tao Wang, Qisheng Huo, Li Yang, Lei. Sun,*, Zhen-An Qiao,*, and Sheng Dai *, ASSOCIATED CONTENT
ASSOCIATED CONTENT Supporting Information Gold Cluster-CeO 2 Nanostructured Hybrid Architectures as Catalysts for Selective Oxidation of Inert Hydrocarbons Yali Liu, Pengfei Zhang, Junmin Liu, Tao Wang,
More informationExplanation of Dramatic ph-dependence of Hydrogen Binding on Noble Metal Electrode: Greatly Weakened Water Adsorption at High ph.
Supplementary Materials Explanation of Dramatic ph-dependence of Hydrogen Binding on Noble Metal Electrode: Greatly Weakened Water Adsorption at High ph. Tao Cheng,, Lu Wang, Boris V Merinov, and William
More informationExperiment Section Fig. S1 Fig. S2
Electronic Supplementary Material (ESI) for ChemComm. This journal is The Royal Society of Chemistry 2018 Supplementary Materials Experiment Section The STM experiments were carried out in an ultrahigh
More informationMorphology-controllable ZnO rings: ionic liquid-assisted hydrothermal synthesis, growth mechanism and photoluminescence properties
Morphology-controllable ZnO rings: ionic liquid-assisted hydrothermal synthesis, growth mechanism and photoluminescence properties (Supporting information) Kezhen Qi, a Jiaqin Yang, a Jiaqi Fu, a Guichang
More information[100] directed Cu-doped h-coo Nanorods: Elucidation of. Growth Mechanism and Application to Lithium-Ion Batteries
Supplementary Information [100] directed Cu-doped h-coo Nanorods: Elucidation of Growth Mechanism and Application to Lithium-Ion Batteries Ki Min Nam, Young Cheol Choi, Sung Chul Jung, Yong-Il Kim, Mi
More informationDFT modeling of novel materials for hydrogen storage
DFT modeling of novel materials for hydrogen storage Tejs Vegge 1, J Voss 1,2, Q Shi 1, HS Jacobsen 1, JS Hummelshøj 1,2, AS Pedersen 1, JK Nørskov 2 1 Materials Research Department, Risø National Laboratory,
More informationLithium Alloying Potentials of Silicon as Anode of Lithium Secondary Batteries
Asian Journal of Chemistry; Vol. 25, No. 10 (2013), 57395743 http://dx.doi.org/10.14233/ajchem.2013.oh78 Lithium Alloying Potentials of Silicon as Anode of Lithium Secondary Batteries CHILHOON DOH 1,*,
More informationAtomic Models for Anionic Ligand Passivation of Cation- Rich Surfaces of IV-VI, II-VI, and III-V Colloidal Quantum Dots
Electronic Supplementary Material (ESI) for ChemComm. This journal is The Royal Society of Chemistry 2016 Electronic Supplementary Information Atomic Models for Anionic Ligand Passivation of Cation- Rich
More informationMgO-decorated carbon nanotubes for CO 2 adsorption: first principles calculations
MgO-decorated carbon nanotubes for CO 2 adsorption: first principles calculations Zhu Feng( ), Dong Shan( ), and Cheng Gang( ) State Key Laboratory for Superlattices and Microstructures, Institute of Semiconductors,
More informationSupplementary Information
Supplementary Information Supplementary Figure 1: Electronic Kohn-Sham potential profile of a charged monolayer MoTe 2 calculated using PBE-DFT. Plotted is the averaged electronic Kohn- Sham potential
More informationCollege of Science, Xi an University of Science and Technology, Xi an *Corresponding author
2016 International Conference on Advanced Manufacture Technology and Industrial Application (AMTIA 2016) ISBN: 978-1-60595-387-8 The Study of Coordination Adsorption Effect that CO Adsorption on 4H-SiC
More informationSupporting Information for
Supporting Information for Pb-activated Amine-assisted Photocatalytic Hydrogen Evolution Reaction on Organic-Inorganic Perovskites Lu Wang *,,, Hai Xiao, Tao Cheng, Youyong Li *,, William A. Goddard III
More informationCrystallographic Dependence of CO Activation on Cobalt Catalysts: HCP versus FCC
Crystallographic Dependence of CO Activation on Cobalt Catalysts: HCP versus FCC Jin-Xun Liu, Hai-Yan Su, Da-Peng Sun, Bing-Yan Zhang, and Wei-Xue Li* State Key Laboratory of Catalysis, Dalian Institute
More informationSelectivity in the initial C-H bond cleavage of n-butane on PdO(101)
Supporting Information for Selectivity in the initial C-H bond cleavage of n-butane on PdO(101) Can Hakanoglu (a), Feng Zhang (a), Abbin Antony (a), Aravind Asthagiri (b) and Jason F. Weaver (a) * (a)
More informationfor Magnesium-Ion Batteries
[Supporting Information] Cointercalation of Mg 2+ Ions into Graphite for Magnesium-Ion Batteries Dong Min Kim, Sung Chul Jung, Seongmin Ha, Youngjin Kim, Yuwon Park, Ji Heon Ryu ǂ, Young Kyu Han*,, Kyu
More informationSupporting Information For Pt Monolayer on Porous Pd-Cu Alloys as Oxygen Reduction Electrocatalysts
Supporting Information For Pt Monolayer on Porous Pd-Cu Alloys as Oxygen Reduction Electrocatalysts Minhua Shao, *, Krista Shoemaker, Amra Peles, Keiichi Kaneko #, Lesia Protsailo UTC Power, South Windsor,
More informationConstruction of Two Dimensional Chiral Networks
Supporting Information Construction of Two Dimensional Chiral Networks through Atomic Bromine on Surfaces Jianchen Lu, De-Liang Bao, Huanli Dong, Kai Qian, Shuai Zhang, Jie Liu, Yanfang Zhang, Xiao Lin
More informationAtomistic Simulations of Hydrogen Storage in Metal Hydrides and Nanoporous Sorbents
Atomistic Simulations of Hydrogen Storage in Metal Hydrides and Nanoporous Sorbents J. Karl Johnson 1,3, Sudhakar V. Alapati 2, Bing Dai 1, Jinchen Liu 1, David S. Sholl 2,3 1 University of Pittsburgh,
More informationSupplemental Information:
Supplemental Information: Nanoscale Voltage Enhancement at Cathode Interfaces in Li-ion Batteries Shenzhen Xu 1, Ryan Jacobs 2, Chris Wolverton 4, Thomas Kuech 3 and Dane Morgan 1,2 1 Materials Science
More informationAnisotropic Lithium Insertion Behavior in Silicon Nanowires: Binding Energy, Diffusion Barrier, and Strain Effect
pubs.acs.org/jpcc Anisotropic Lithium Insertion Behavior in Silicon Nanowires: Binding Energy, Diffusion Barrier, and Strain Effect Qianfan Zhang, Yi Cui,*, and Enge Wang, Institute of Physics, Chinese
More informationUniversity of Chinese Academy of Sciences, Beijing , People s Republic of China,
SiC 2 Siligraphene and Nanotubes: Novel Donor Materials in Excitonic Solar Cell Liu-Jiang Zhou,, Yong-Fan Zhang, Li-Ming Wu *, State Key Laboratory of Structural Chemistry, Fujian Institute of Research
More informationSupporting information. Realizing Two-Dimensional Magnetic Semiconductors with. Enhanced Curie Temperature by Antiaromatic Ring Based
Supporting information Realizing Two-Dimensional Magnetic Semiconductors with Enhanced Curie Temperature by Antiaromatic Ring Based Organometallic Frameworks Xingxing Li and Jinlong Yang* Department of
More informationEnergetics of Hydrogen Storage Reactions: The Power of DFT. Jan Herbst Materials and Processes Laboratory GM R&D Center
Energetics of Hydrogen Storage Reactions: The Power of DFT Jan Herbst Materials and Processes Laboratory GM R&D Center ACKNOWLEDGEMENTS Fellow explorer: Lou Hector Sometime shipmate: Wes Capehart Outline
More informationSpontaneous High Piezoelectricity in Poly (vinylidene fluoride) Nanoribbons Produced by Iterative Thermal Size Reduction Technique
Spontaneous High Piezoelectricity in Poly (vinylidene fluoride) Nanoribbons Produced by Iterative Thermal Size Reduction Technique Mehmet Kanik 1,2, Ozan Aktas 1,3, Huseyin Sener Sen 1, Engin Durgun 1,2
More informationSolid State Sciences
Solid State Sciences 11 (2009) 1898 1902 Contents lists available at ScienceDirect Solid State Sciences journal homepage: www.elsevier.com/locate/ssscie Structural and electronic properties of lithium
More informationSupplementary Figure 1. HRTEM images of PtNi / Ni-B composite exposed to electron beam. The. scale bars are 5 nm.
Supplementary Figure 1. HRTEM images of PtNi / Ni-B composite exposed to electron beam. The scale bars are 5 nm. S1 Supplementary Figure 2. TEM image of PtNi/Ni-B composite obtained under N 2 protection.
More informationTwo-Dimensional CH 3 NH 3 PbI 3 Perovskite: Synthesis and Optoelectronic Application
Two-Dimensional CH 3 NH 3 PbI 3 Perovskite: Synthesis and Optoelectronic Application Jingying Liu,, Yunzhou Xue,,, Ziyu Wang,, Zai-Quan Xu, Changxi Zheng, Bent Weber, Jingchao Song, Yusheng Wang, Yuerui
More informationAb initio Rutile-Cristobalite Transitions in Silicon Dioxide and Titanium Dioxide
20 Ab initio Rutile-Cristobalite Transitions in Silicon Dioxide and Titanium Dioxide Moon, Timothy Y. ; Kroll, Peter Department of Chemistry and Biochemistry, The University of Texas at Arlington, Arlington,
More informationBody Centered Cubic Magnesium Niobium Hydride with Facile Room Temperature Absorption and Four Weight Percent Reversible Capacity
Electronic Supplementary Information (ESI) for Energy & Environmental Science This journal is The Royal Society of Chemistry 212 Supporting Information Body Centered Cubic Magnesium Niobium Hydride with
More informationQuantum Chemical Study of Defective Chromium Oxide
, March 13-15, 2013, Hong Kong Quantum Chemical Study of Defective Chromium Oxide Richard Rivera, Soraya Jácome, Frank Maldonado, Arvids Stashans 1 Abstract Through the use of first-principles calculations
More informationCurvature-enhanced Spin-orbit Coupling and Spinterface Effect in Fullerene-based Spin Valves
Supplementary Information Curvature-enhanced Spin-orbit Coupling and Spinterface Effect in Fullerene-based Spin Valves Shiheng Liang 1, Rugang Geng 1, Baishun Yang 2, Wenbo Zhao 3, Ram Chandra Subedi 1,
More informationUTC Power, South Windsor, CT United Technologies Research Center, East Hartford, CT
Supporting Information Electrocatalysis on Platinum Nanoparticles: Particle Size Effect on Oxygen Reduction Reaction Activity Minhua Shao,, * Amra Peles,, * Krista Shoemaker UTC Power, South Windsor, CT
More informationarxiv: v1 [cond-mat.mes-hall] 15 Aug 2014
The potential applications of phosphorene as anode arxiv:1408.3488v1 [cond-mat.mes-hall] 15 Aug 2014 materials in Li-ion batteries Shijun Zhao,, and Wei Kang, HEDPS, Center for Applied Physics and Technology,
More informationChromium Cluster on Defected Graphene
Chromium Cluster on Defected Graphene Yuhang Liu June 29, 2017 Abstract In this work, diffusion process of Cr atoms on two types of defected graphene and structure and magnetic properties of Cr cluster
More informationSupplemental Information. Lightweight Metallic MgB 2 Mediates. Polysulfide Redox and Promises High- Energy-Density Lithium-Sulfur Batteries
JOUL, Volume 3 Supplemental Information Lightweight Metallic MgB 2 Mediates Polysulfide Redox and Promises High- Energy-Density Lithium-Sulfur Batteries Quan Pang, Chun Yuen Kwok, Dipan Kundu, Xiao Liang,
More informationSupporting Information Tuning Local Electronic Structure of Single Layer MoS2 through Defect Engineering
Supporting Information Tuning Local Electronic Structure of Single Layer MoS2 through Defect Engineering Yan Chen, 1,2,,$, * Shengxi Huang, 3,6, Xiang Ji, 2 Kiran Adepalli, 2 Kedi Yin, 8 Xi Ling, 3,9 Xinwei
More informationA Tunable, Strain-Controlled Nanoporous MoS 2 Filter for Water Desalination
Supporting Information A Tunable, Strain-Controlled Nanoporous MoS 2 Filter for Water Desalination Weifeng Li 1, Yanmei Yang 1, Jeffrey K. Weber 2, Gang Zhang* 3, Ruhong Zhou* 1,2,4 1. School for Radiological
More informationDefects in TiO 2 Crystals
, March 13-15, 2013, Hong Kong Defects in TiO 2 Crystals Richard Rivera, Arvids Stashans 1 Abstract-TiO 2 crystals, anatase and rutile, have been studied using Density Functional Theory (DFT) and the Generalized
More informationFirst Principles Calculation of Defect and Magnetic Structures in FeCo
Materials Transactions, Vol. 47, No. 11 (26) pp. 2646 to 26 Special Issue on Advances in Computational Materials Science and Engineering IV #26 The Japan Institute of Metals First Principles Calculation
More informationChemistry: The Central Science. Chapter 20: Electrochemistry
Chemistry: The Central Science Chapter 20: Electrochemistry Redox reaction power batteries Electrochemistry is the study of the relationships between electricity and chemical reactions o It includes the
More informationThe Nature of the Interlayer Interaction in Bulk. and Few-Layer Phosphorus
Supporting Information for: The Nature of the Interlayer Interaction in Bulk and Few-Layer Phosphorus L. Shulenburger, A.D. Baczewski, Z. Zhu, J. Guan, and D. Tománek, Sandia National Laboratories, Albuquerque,
More informationSupporting Information
Electronic Supplementary Material (ESI) for Journal of Materials Chemistry A. This journal is The Royal Society of Chemistry 017 Supporting Information Self-Supported Nickel Phosphosulphide Nanosheets
More informationSupporting Online Material for
www.sciencemag.org/cgi/content/full/325/5948/1670/dc1 Supporting Online Material for Coordinatively Unsaturated Al 3+ Centers as Binding Sites for Active Catalyst Phases of Platinum on γ-al 2 O 3 Ja Hun
More informationSupplementary Information: Construction of Hypothetical MOFs using a Graph Theoretical Approach. Peter G. Boyd and Tom K. Woo*
Electronic Supplementary Material ESI) for CrystEngComm. This journal is The Royal Society of Chemistry 2016 Supplementary Information: Construction of Hypothetical MOFs using a Graph Theoretical Approach
More informationApplications of the variable-composition structure prediction
Applications of the variable-composition structure prediction Chaohao Hu School of Materials Science and Engineering Guilin University of Electronic Technology August 7, 2013, GUET, China Contents Why
More information2014 GCEP Report - External
2014 GCEP Report - External Project title: High-Energy-Density Lithium Ion Battery using Self-Healing Polymers Investigators Zhenan Bao, Professor, Chemical Engineering Yi Cui, Professor, Material Sciences
More informationStructural Effect on the Oxygen Evolution Reaction in the Electrochemical Catalyst FePt
New Physics: Sae Mulli, Vol. 65, No. 9, September 2015, pp. 878 882 DOI: 10.3938/NPSM.65.878 Structural Effect on the Oxygen Evolution Reaction in the Electrochemical Catalyst FePt Wonseok Jeong Gijae
More informationSupporting Information
Copyright WILEY-VCH Verlag GmbH & Co. KGaA, 69469 Weinheim, Germany, 2018. Supporting Information for Adv. Energy Mater., DOI: 10.1002/aenm.201800144 H 2 V 3 O 8 Nanowire/Graphene Electrodes for Aqueous
More informationSupporting Information for. Revealing Surface Elemental Composition and Dynamic Processes
Supporting Information for Revealing Surface Elemental Composition and Dynamic Processes Involved in Facet-dependent Oxidation of Pt 3 Co Nanoparticles via in-situ Transmission Electron Microscopy Sheng
More informationSupporting Information for
Supporting Information for Designing Air-Stable O3-Type Cathode Materials by Combined Structure Modulation for Na-Ion Batteries Hu-Rong Yao,, Peng-Fei Wang,, Yue Gong, Jienan Zhang, Xiqian Yu, Lin Gu,,
More informationSupporting information. Origins of High Electrolyte-Electrode Interfacial Resistances in Lithium Cells. Containing Garnet Type LLZO Solid Electrolytes
Electronic Supplementary Material (ESI) for Physical Chemistry Chemical Physics. This journal is the Owner Societies 2014 Supporting information Origins of High Electrolyte-Electrode Interfacial Resistances
More informationTiC 2 : A New Two Dimensional Sheet beyond MXenes
Electronic Supplementary Material (ESI) for Nanoscale. This journal is The Royal Society of Chemistry 2015 Supplementary Information (SI) TiC 2 : A New Two Dimensional Sheet beyond MXenes Tianshan Zhao,
More informationEffective interactions between the N-H bond orientations in lithium imide and a proposed ground-state structure
Effective interactions between the N-H bond orientations in lithium imide and a proposed ground-state structure Tim Mueller and Gerbrand Ceder* Department of Materials Science and Engineering, Massachusetts
More informationChapter 19: Oxidation - Reduction Reactions
Chapter 19: Oxidation - Reduction Reactions 19-1 Oxidation and Reduction I. Oxidation States A. The oxidation rules (as summarized by Mr. Allan) 1. In compounds, hydrogen has an oxidation # of +1. In compounds,
More informationSnO 2 Physical and Chemical Properties due to the Impurity Doping
, March 13-15, 2013, Hong Kong SnO 2 Physical and Chemical Properties due to the Impurity Doping Richard Rivera, Freddy Marcillo, Washington Chamba, Patricio Puchaicela, Arvids Stashans Abstract First-principles
More informationIV.D.2 Hydrogen Storage Materials for Fuel Cell-Powered Vehicles
IV.D.2 Hydrogen Storage Materials for Fuel Cell-Powered Vehicles Andrew Goudy Delaware State University 2 N. Dupont Highway Dover, DE 99 Phone: (32) 857-6534 Email: agoudy@desu.edu DOE Managers Ned Stetson
More informationSupporting Information. Don-Hyung Ha, Liane M. Moreau, Clive R. Bealing, Haitao Zhang, Richard G. Hennig, and. Richard D.
Supporting Information The structural evolution and diffusion during the chemical transformation from cobalt to cobalt phosphide nanoparticles Don-Hyung Ha, Liane M. Moreau, Clive R. Bealing, Haitao Zhang,
More informationDirect Line-of-site Gas Desorption Study of LiBH 4 in Nanoporous Carbons: The Size Effect
Direct Line-of-site Gas Desorption Study of LiBH 4 in Nanoporous Carbons: The Size Effect David Peaslee Center for Nanoscience and Department of Physics and Astronomy University of Missouri St. Louis Advised
More information6. Computational Design of Energy-related Materials
6. Computational Design of Energy-related Materials Contents 6.1 Atomistic Simulation Methods for Energy Materials 6.2 ab initio design of photovoltaic materials 6.3 Solid Ion Conductors for Fuel Cells
More informationEffective potentials for quasicrystals from ab-initio data
Effective potentials for quasicrystals from ab-initio data Peter Brommer and Franz Gähler Institut für Theoretische und Angewandte Physik Universität Stuttgart August 31, 2005 Abstract Classical effective
More informationPhonon calculations with SCAN
Workshop on the SCAN density functional: Fundamentals, practices, and extensions Temple university, Philadelphia May 18th, 2017 Hands-on tutorial 3 Phonon calculations with SCAN Yubo Zhang and Jianwei
More informationThe effect of light impurities on the binding energy of hydrogen in magnesium metal and magnesium hydride
The effect of light impurities on the binding energy of hydrogen in magnesium metal and magnesium hydride Finnbogi Óskarsson Science Institute, University of Iceland, Dunhaga 3, IS-107 Reykjavík, Iceland
More informationELEMENTARY DIFFUSION PROCESSES IN AL-CU-ZN ALLOYS: AN AB INITIO STUDY
ELEMENTARY DIFFUSION PROCESSES IN AL-CU-ZN ALLOYS: AN AB INITIO STUDY S. GRABOWSKI AND P. ENTEL Theoretische Tieftemperaturphysik, Gerhard-Mercator-Universität Duisburg, 47048 Duisburg, Germany E-mail:
More informationMagnetic properties of quasi one-dimensional vanadium-benzene nanowire affected by gas molecules: a first-principle study
Magnetic properties of quasi one-dimensional vanadium-benzene nanowire affected by gas molecules: a first-principle study Min Wang, Yan Zhou, Sui Kong Hark, Xi Zhu School of Science and Engineering, The
More informationPS 4. Cl 2. Superionic Conductors Predicted from Silver. Thiophosphates using Efficiently Tiered Ab Initio. Molecular Dynamics Simulations
Li 3 Y(PS 4 ) 2 and Li 5 PS 4 Cl 2 : New Lithium Superionic Conductors Predicted from Silver Thiophosphates using Efficiently Tiered Ab Initio Molecular Dynamics Simulations Supporting Information Zhuoying
More informationSupplementary Materials for Oxygen-induced self-assembly of quaterphenyl molecule on metal surfaces
Electronic Supplementary Material (ESI) for ChemComm. This journal is The Royal Society of Chemistry 2014 Supplementary Materials for Oxygen-induced self-assembly of quaterphenyl molecule on metal surfaces
More informationOxygen vacancies enhance pseudocapacitive charge storage properties of MoO 3-x
In the format provided by the authors and unedited. DOI: 10.1038/NMAT4810 Oxygen vacancies enhance pseudocapacitive charge storage properties of MoO 3-x Hyung-Seok Kim, 1 John B. Cook, 2,3 Hao Lin, 1 Jesse
More informationFirst-principles studies of cation-doped spinel LiMn 2 O 4 for lithium ion batteries
First-principles studies of cation-doped spinel LiMn 2 O 4 for lithium ion batteries Siqi Shi, 1 Ding-sheng Wang, 2 Sheng Meng, 2 Liquan Chen, 1 and Xuejie Huang 1, * 1 Nanoscale Physics and Devices Laboratory,
More informationSupplementary Information for:
Supplementary Information for: Towards Active and Stable Oxygen Reduction Cathode: A Density Functional Theory Survey on Pt 2 M skin alloys Guang-Feng Wei and Zhi-Pan Liu* Shanghai Key Laboratory of lecular
More informationSTRUCTURAL AND MECHANICAL PROPERTIES OF AMORPHOUS SILICON: AB-INITIO AND CLASSICAL MOLECULAR DYNAMICS STUDY
STRUCTURAL AND MECHANICAL PROPERTIES OF AMORPHOUS SILICON: AB-INITIO AND CLASSICAL MOLECULAR DYNAMICS STUDY S. Hara, T. Kumagai, S. Izumi and S. Sakai Department of mechanical engineering, University of
More informationThe Atomic and Electronic Structure Changes Upon Delithiation of LiCoO 2 : From First Principles Calculations
Int. J. Electrochem. Sci., 7 (2012) 9390-9400 International Journal of ELECTROCHEMICAL SCIENCE www.electrochemsci.org The Atomic and Electronic Structure Changes Upon Delithiation of LiCoO 2 : From First
More informationFARMINGDALE STATE COLLEGE DEPARTMENT OF CHEMISTRY
FARMINGDALE STATE COLLEGE DEPARTMENT OF CHEMISTRY COURSE OUTLINE: COURSE TITLE: Prepared by: Dr. Victor Huang September 2016 General Chemistry Principles II COURSE CODE: CHM 153 CREDITS: 4 CONTACT HOURS:
More information1 IMEM-CNR, U.O.S. Genova, Via Dodecaneso 33, Genova, IT. 2 Dipartimento di Fisica, Università di Genova, Via Dodecaneso 33, Genova, IT
Spontaneous Oxidation of Ni Nanoclusters on MgO Monolayers Induced by Segregation of Interfacial Oxygen. M. Smerieri 1, J. Pal 1,2, L. Savio 1*, L. Vattuone 1,2, R. Ferrando 1,3, S. Tosoni 4, L. Giordano
More informationMutual Influence of Different Hydrogen Concentration in α-zirconium System with Vacancies
Mutual Influence of Different Hydrogen Concentration in α-zirconium System with Vacancies Heng-Yu Li 12, Hao-Jun Jia 12, Yan-Zhen Zhao 12, L.A. Svyatkin 1, I.P. Chernov 1 a Department of General Physics,
More informationElectronic Supplementary Information for. Impact of Intermediate Sites on Bulk Diffusion Barriers: Mg. Intercalation in Mg 2 Mo 3 O 8
Electronic Supplementary Material (ESI) for Journal of Materials Chemistry A. This journal is The Royal Society of Chemistry 2016 Electronic Supplementary Information for Impact of Intermediate Sites on
More informationLithium Batteries. Rechargeable batteries
Lithium Batteries One of the main attractions of lithium as an anode material is its position as the most electronegative metal in the electrochemical series combined with its low density, thus offering
More informationHydrogenation of Penta-Graphene Leads to Unexpected Large. Improvement in Thermal Conductivity
Supplementary information for Hydrogenation of Penta-Graphene Leads to Unexpected Large Improvement in Thermal Conductivity Xufei Wu, a Vikas Varshney, b,c Jonghoon Lee, b,c Teng Zhang, a Jennifer L. Wohlwend,
More informationSMARTMET project: Towards breaking the inverse ductility-strength relation
SMARTMET project: Towards breaking the inverse ductility-strength relation B. Grabowski, C. Tasan SMARTMET ERC advanced grant 3.8 Mio Euro for 5 years (Raabe/Neugebauer) Adaptive Structural Materials group
More informationSupplementary information for: Requirements for Reversible Extra-Capacity in Li-Rich Layered Oxides for Li-Ion Batteries
Electronic Supplementary Material (ESI) for Energy & Environmental Science. This journal is The Royal Society of Chemistry 2016 Supplementary information for: Requirements for Reversible Extra-Capacity
More informationA New Cathode Material for Potassium-Ion Batteries
A New Cathode Material for Potassium-Ion Batteries Monday, 29 May 2017 13:40-14:00 Abstract #: A02-0154 Haegyeom Kim, Jae Chul Kim, Shou-Hang Bo, Tan Shi, Deok-Hwang Kwon, and Gerbrand Ceder* Post-doc
More informationIdentifying the rate-limiting processes at the Li-air cathode
Identifying the rate-limiting processes at the Li-air cathode Tejs Vegge Risø DTU, National Laboratory for Sustainable Energy and Center for Atomic-scale Materials Design, Technical University of Denmark
More informationOptical properties of chalcopyrite-type intermediate transition metal band materials from first principles
Optical properties of chalcopyrite-type intermediate transition metal band materials from first principles I. Aguilera, P. Palacios, P. Wahnon Institute de Energia Solar and Departamiento de Tecnologias
More informationAB INITIO MOLECULAR-DYNAMICS SIMULATIONS OF ADSORPTION OF DYE MOLECULES AT SURFACES
AB INITIO MOLECULAR-DYNAMICS SIMULATIONS OF ADSORPTION OF DYE MOLECULES AT SURFACES M. SUGIHARA, H. MEYER, AND P. ENTEL Theoretische Tieftemperaturphysik, Universität Duisburg, 47048 Duisburg, Germany
More informationThe Importance of Electrochemistry for the Development of Sustainable Mobility
TUM CREATE Centre for Electromobility, Singapore The Importance of Electrochemistry for the Development of Sustainable Mobility Jochen Friedl, Ulrich Stimming DPG-Frühjahrstagung, Working Group on Energy,
More informationDesign of Efficient Catalysts with Double Transition Metal. Atoms on C 2 N Layer
Supporting Information Design of Efficient Catalysts with Double Transition Metal Atoms on C 2 N Layer Xiyu Li, 1, Wenhui Zhong, 2, Peng Cui, 1 Jun Li, 1 Jun Jiang 1, * 1 Hefei National Laboratory for
More informationCO 2 abatement by two-dimensional MXene carbides
for Journal of Materials Chemistry A. This journal is The Royal Society of Chemistry 2018 Electronic Supplementary Material (ESI) CO 2 abatement by two-dimensional MXene carbides Ángel Morales-García,
More informationDefense Technical Information Center Compilation Part Notice
UNCLASSIFIED Defense Technical Information Center Compilation Part Notice ADP012658 TITLE: Synthesis of Nanosized Lithium Manganate For Lithium-ion Secondary Batteries DISTRIBUTION: Approved for public
More informationOxidation-reduction (redox) reactions
Oxidation-reduction (redox) reactions Reactions in which there are changes in oxidation state (oxidation number) between reactants and products 2 MnO 4- + 10 Br - + 16 H + 2 Mn 2+ + 5 Br 2 + 8 H 2 O One
More informationThe Low Temperature Conversion of Methane to Methanol on CeO x /Cu 2 O catalysts: Water Controlled Activation of the C H Bond
The Low Temperature Conversion of Methane to Methanol on CeO x /Cu 2 O catalysts: Water Controlled Activation of the C H Bond Zhijun Zuo, a Pedro J. Ramírez, b Sanjaya Senanayake, a Ping Liu c,* and José
More informationStabilization of polysulfides via lithium bonds for Li S batteries
Electronic Supplementary Material (ESI) for Journal of Materials Chemistry A. This journal is The Royal Society of Chemistry 2016 Supporting Information Stabilization of polysulfides via lithium bonds
More informationSynthesis of LiFePO 4 Nanostructures for Lithium-Ion Batteries by Electrochemical Deposition
Synthesis of LiFePO 4 Nanostructures for Lithium-Ion Batteries by Electrochemical Deposition Erika Aragon and Alfredo A. Martinez-Morales Southern California Research Initiative for Solar Energy College
More informationTeacher: Mr. gerraputa. Name: Base your answer to the question on the information below. Given the electron dot diagram:
Teacher: Mr. gerraputa Print Close Name: 1. Given the electron dot diagram: The valence electrons represented by the electron dot diagram could be those of atoms in Group 1. 13 3. 3 2. 15 4. 16 2. Which
More information