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Journal of Electrochemistry ›› 2005, Vol. 11 ›› Issue (1): 46-52.

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The Mechanism of the Improvement on Cycling Performance and Thermal Stability of LiNi_(0.8)Co_(0.2)O_2 by Ti-doping

LIU Han-san, LI Jie, GONG Zheng-liang, ZHANG Zhong-ru, YANG Yong~   

  1. (*)(State Key Laboratory for Physical Chemistry of Solid Surfaces,Department of Chemistry, Xiamen University, Xiamen 361005, China
  • Received:2005-02-28 Revised:2005-02-28 Online:2005-02-28 Published:2005-02-28

Abstract: Improved cycling performance and enhanced thermal stability were observed for Ti-doped LiNi_(0.8)Co_(0.2)O_2 cathode materials. The mechanism of these positive effects was investigated in this work. The improved cycling performance of Ti-doped cathodes is ascribed to the suppression of phase transitions and lattice changes during cycling, and the decrease of interfacial reaction activity between the cathode and electrolyte. The enhanced thermal stability of Ti-doped cathodes is attributed to the suppression of thermal decomposition reaction of delithiated cathode material, which will produce heat and oxygen gas as the cause of electrolyte decomposition and combustion reaction.

Key words: Lithium nickel cobalt oxide, Ti-doping, Cycling performance, Thermal stability, Cathode materials, Lithium ion batteries

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