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Rotor blade grinding and re-annealing of LiCoO2: SEM, XPS, EIS and electrochemical study

Alcántara, Ricardo and Ortiz, Gregorio F. and Lavela, Pedro and Tirado, José L. and Jaegermann, Wolfram and Thißen, Andreas :
Rotor blade grinding and re-annealing of LiCoO2: SEM, XPS, EIS and electrochemical study.
[Online-Edition: http://dx.doi.org/10.1016/j.jelechem.2005.07.011]
In: Journal of Electroanalytical Chemistry, 584 (2) pp. 147-156. ISSN 15726657
[Article] , (2005)
Note:

SFB 595 A3

Official URL: http://dx.doi.org/10.1016/j.jelechem.2005.07.011

Abstract

The layered particles of lithium cobalt oxide (LiCoO2) have been modified using rotor blade grinding, re-annealing, and a combination of both treatments. SEM, XPS and EIS were used to study the effects of these treatments on the LiCoO2 particles, and changes in electrochemical behaviour in the 4-V region vs. Li+/Li were explored. After short grinding times (20 min), primary layered particles formed larger aggregates and poor electrochemical behaviour was observed. After 60 min grinding, LiCoO2 showed a net improvement in reversible specific capacity and capacity retention, which is due to the formation of ultrafine layered particles. Further grinding up to 180 min lead to surface carbonation, increased impedances and poor electrochemical performance. Re-annealing improved the electrochemical behaviour of both ground and unground LiCoO2. The best electrochemical behaviour was observed after grinding for 60 min and then re-annealing at 850 °C, which is linked with a low charge transfer resistance. XPS measurements revealed that the particles surface remained unchanged after heating to 500 °C, while heating to 850 °C eliminated surface carbonates, and prolonged grinding yielded extended surface carbonation.

Item Type: Article
Erschienen: 2005
Creators: Alcántara, Ricardo and Ortiz, Gregorio F. and Lavela, Pedro and Tirado, José L. and Jaegermann, Wolfram and Thißen, Andreas
Title: Rotor blade grinding and re-annealing of LiCoO2: SEM, XPS, EIS and electrochemical study
Language: English
Abstract:

The layered particles of lithium cobalt oxide (LiCoO2) have been modified using rotor blade grinding, re-annealing, and a combination of both treatments. SEM, XPS and EIS were used to study the effects of these treatments on the LiCoO2 particles, and changes in electrochemical behaviour in the 4-V region vs. Li+/Li were explored. After short grinding times (20 min), primary layered particles formed larger aggregates and poor electrochemical behaviour was observed. After 60 min grinding, LiCoO2 showed a net improvement in reversible specific capacity and capacity retention, which is due to the formation of ultrafine layered particles. Further grinding up to 180 min lead to surface carbonation, increased impedances and poor electrochemical performance. Re-annealing improved the electrochemical behaviour of both ground and unground LiCoO2. The best electrochemical behaviour was observed after grinding for 60 min and then re-annealing at 850 °C, which is linked with a low charge transfer resistance. XPS measurements revealed that the particles surface remained unchanged after heating to 500 °C, while heating to 850 °C eliminated surface carbonates, and prolonged grinding yielded extended surface carbonation.

Journal or Publication Title: Journal of Electroanalytical Chemistry
Volume: 584
Number: 2
Uncontrolled Keywords: Battery; XPS; Ac impedance; Galvanostatic Article Outline
Divisions: 11 Department of Materials and Earth Sciences
11 Department of Materials and Earth Sciences > Material Science
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
DFG-Collaborative Research Centres (incl. Transregio)
Date Deposited: 04 Aug 2011 09:22
Official URL: http://dx.doi.org/10.1016/j.jelechem.2005.07.011
Additional Information:

SFB 595 A3

Identification Number: doi:10.1016/j.jelechem.2005.07.011
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