Electrochemical kinetics and cycling performance of nano Li[Li 0.23Co 0.3Mn 0.47]O 2 cathode material for lithium ion batteries

• Published in: Electrochemistry communications Vol. 11; no. 10; pp. 2008 - 2011
• Main Authors: Wei, Y.J., Nikolowski, K., Zhan, S.Y., Ehrenberg, H., Oswald, S., Chen, G., Wang, C.Z., Chen, H.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.10.2009
• Subjects: Cathode material; Cycling performance; Electrochemical kinetics; Lithium ion battery; Nano material; Cathode material; Lithium ion battery; Nano material; Cycling performance; Electrochemical kinetics
• ISSN: 1388-2481; 1873-1902
• DOI: 10.1016/j.elecom.2009.08.040

Li[Li 0.23Co 0.3Mn 0.47]O 2 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 Li 2CO 3 layer. The material showed promising electrochemical performance when cycled up to 3 C 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 (∼ C/50) in the first cycle. This led to excellent electrochemical performance in the following cycles. For instance, the 1 C-rate capacity increased to 168 mA h g −1 after 50 cycles, comparing with the 145 mA h g −1 obtained without pre-charging.