Laubach, Sonja and Laubach, Stefan and Schmidt, Peter C. and Gröting, Melanie and Albe, Karsten and Jaegermann, Wolfram and Wolf, Walter (2009):
Structure, Electronic Structure and Defect Formation Energies of LixCo1-yNiyO2 as a Function of x (0<x<1) and y (y = 0, 0.5, 1).
In: Zeitschrift für Physikalische Chemie, 223 (10-11), pp. 1327-1340. ISSN 0942-9352,
[Article]
Abstract
LixCoO2 and LixNiO2 (0.5<x<1) are prototype cathode materials in lithium ion batteries.Both systems show degradation and fatigue during electrochemical cycling. We have performed band structure calculations based on density-functional theory for a series of compounds Lix(Co,Ni)O2 (0<x<1). The distribution of the transition metals (TM) cobalt and nickel on TM sites as well as the electronic structure of these compounds is investigated with focus on the change of oxidation states of cobalt, nickel and oxygen during lithium de-intercalation. We also study the total energy as a function of the lithium content x, including the vibrational energy Ev and the formation energy of lithium vacancies E(VLi). It is found that Ev is small compared to E(VLi) and that E(VLi) is increasing with increasing x for all systems.
Item Type: |
Article
|
Erschienen: |
2009 |
Creators: |
Laubach, Sonja and Laubach, Stefan and Schmidt, Peter C. and Gröting, Melanie and Albe, Karsten and Jaegermann, Wolfram and Wolf, Walter |
Title: |
Structure, Electronic Structure and Defect Formation Energies of LixCo1-yNiyO2 as a Function of x (0<x<1) and y (y = 0, 0.5, 1) |
Language: |
English |
Abstract: |
LixCoO2 and LixNiO2 (0.5<x<1) are prototype cathode materials in lithium ion batteries.Both systems show degradation and fatigue during electrochemical cycling. We have performed band structure calculations based on density-functional theory for a series of compounds Lix(Co,Ni)O2 (0<x<1). The distribution of the transition metals (TM) cobalt and nickel on TM sites as well as the electronic structure of these compounds is investigated with focus on the change of oxidation states of cobalt, nickel and oxygen during lithium de-intercalation. We also study the total energy as a function of the lithium content x, including the vibrational energy Ev and the formation energy of lithium vacancies E(VLi). It is found that Ev is small compared to E(VLi) and that E(VLi) is increasing with increasing x for all systems. |
Journal or Publication Title: |
Zeitschrift für Physikalische Chemie |
Journal volume: |
223 |
Number: |
10-11 |
Uncontrolled Keywords: |
Defect Formation Energies, Electronic Structure, Cobalt, Lithium, Nickel |
Divisions: |
11 Department of Materials and Earth Sciences > Material Science > Materials Modelling 11 Department of Materials and Earth Sciences > Material Science > Surface Science Zentrale Einrichtungen DFG-Collaborative Research Centres (incl. Transregio) > Collaborative Research Centres > CRC 595: Electrical fatigue DFG-Collaborative Research Centres (incl. Transregio) > Collaborative Research Centres > CRC 595: Electrical fatigue > A - Synthesis DFG-Collaborative Research Centres (incl. Transregio) > Collaborative Research Centres > CRC 595: Electrical fatigue > A - Synthesis > Subproject A3: Boundary layers and thin films of ionic conductors: Electronic structure, electrochemical potentials, defect formation and degradation mechanisms DFG-Collaborative Research Centres (incl. Transregio) > Collaborative Research Centres > CRC 595: Electrical fatigue > C - Modelling DFG-Collaborative Research Centres (incl. Transregio) > Collaborative Research Centres > CRC 595: Electrical fatigue > C - Modelling > Subproject C1: Quantum mechanical computer simulations for electron and defect structure of oxides 11 Department of Materials and Earth Sciences > Material Science 11 Department of Materials and Earth Sciences DFG-Collaborative Research Centres (incl. Transregio) > Collaborative Research Centres DFG-Collaborative Research Centres (incl. Transregio) |
Date Deposited: |
04 Aug 2011 08:07 |
Official URL: |
http://dx.doi.org/10.1524/zpch.2009.6082 |
Additional Information: |
SFB 595 Cooperation A3, C1 |
Identification Number: |
doi:10.1524/zpch.2009.6082 |
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