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Electrochemical kinetics and cycling performance of nano Li[Li0.23Co0.3Mn0.47]O2 cathode material for lithium ion batteries

Wei, Y. J. and Nikolowski, Kristian and Zhang, Shan-Tao and Ehrenberg, Helmut and Oswald, S. and Chen, G. and Wang, C. Z. and Chen, H. (2009):
Electrochemical kinetics and cycling performance of nano Li[Li0.23Co0.3Mn0.47]O2 cathode material for lithium ion batteries.
In: Electrochemistry Communications, pp. 2008-2011, 11, (10), ISSN 13882481,
[Online-Edition: http://dx.doi.org/10.1016/j.elecom.2009.08.040],
[Article]

Abstract

Li[Li0.23Co0.3Mn0.47]O2 cathode material was prepared by a sol–gel method. The material had a primary particle size of about 100 nm, covered by a 30 Å of Li2CO3 layer. The material showed promising electrochemical performance when cycled up to 3C rate. The electrochemical kinetics of the first charge was much slower than that of the second charge, due to the complex electrochemical process which involved not only Li+ diffusion but also release of oxygen. By taking account of this, the material was pre-charged very slowly (not, vert, similarC/50) in the first cycle. This led to excellent electrochemical performance in the following cycles. For instance, the 1C-rate capacity increased to 168 mA h g−1 after 50 cycles, comparing with the 145 mA h g−1 obtained without pre-charging.

Item Type: Article
Erschienen: 2009
Creators: Wei, Y. J. and Nikolowski, Kristian and Zhang, Shan-Tao and Ehrenberg, Helmut and Oswald, S. and Chen, G. and Wang, C. Z. and Chen, H.
Title: Electrochemical kinetics and cycling performance of nano Li[Li0.23Co0.3Mn0.47]O2 cathode material for lithium ion batteries
Language: English
Abstract:

Li[Li0.23Co0.3Mn0.47]O2 cathode material was prepared by a sol–gel method. The material had a primary particle size of about 100 nm, covered by a 30 Å of Li2CO3 layer. The material showed promising electrochemical performance when cycled up to 3C rate. The electrochemical kinetics of the first charge was much slower than that of the second charge, due to the complex electrochemical process which involved not only Li+ diffusion but also release of oxygen. By taking account of this, the material was pre-charged very slowly (not, vert, similarC/50) in the first cycle. This led to excellent electrochemical performance in the following cycles. For instance, the 1C-rate capacity increased to 168 mA h g−1 after 50 cycles, comparing with the 145 mA h g−1 obtained without pre-charging.

Journal or Publication Title: Electrochemistry Communications
Volume: 11
Number: 10
Uncontrolled Keywords: Lithium ion battery; Cathode material; Nano material; Electrochemical kinetics; Cycling performance
Divisions: DFG-Collaborative Research Centres (incl. Transregio) > Collaborative Research Centres > CRC 595: Electrical fatigue > B - Characterisation > Subproject B4: In situ investigations of the degradation of intercalation batteries and their modelling
DFG-Collaborative Research Centres (incl. Transregio) > Collaborative Research Centres > CRC 595: Electrical fatigue > B - Characterisation
DFG-Collaborative Research Centres (incl. Transregio) > Collaborative Research Centres > CRC 595: Electrical fatigue
Zentrale Einrichtungen
DFG-Collaborative Research Centres (incl. Transregio) > Collaborative Research Centres
DFG-Collaborative Research Centres (incl. Transregio)
Date Deposited: 15 Aug 2011 09:41
Official URL: http://dx.doi.org/10.1016/j.elecom.2009.08.040
Additional Information:

SFB 595 B4

Identification Number: doi:10.1016/j.elecom.2009.08.040
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