LiNi_(0.8-y)Ti_yCo_(0.2)O_2电极材料中钛离子掺杂作用机理的研究

电化学（中英文） ›› 2005, Vol. 11 ›› Issue (1): 46-52.

LiNi_(0.8-y)Ti_yCo_(0.2)O_2电极材料中钛离子掺杂作用机理的研究

刘汉三,李劼,龚正良,张忠如,杨勇

厦门大学化学系,厦门大学化学系,厦门大学化学系,厦门大学化学系,厦门大学化学系固体表面物理化学国家重点实验室,福建厦门361005 ,固体表面物理化学国家重点实验室,福建厦门361005 ,固体表面物理化学国家重点实验室,福建厦门361005 ,固体表面物理化学国家重点实验室,福建厦门361005 ,固体表面物理化学国家重点实验室,福建厦门361005

收稿日期:2005-02-28 修回日期:2005-02-28 出版日期:2005-02-28 发布日期:2005-02-28

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~

(*)(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 Published:2005-02-28 Online:2005-02-28

摘要/Abstract

摘要： 应用恒流充放电、非现场X射线粉末衍射 (ex situXRD)、电化学交流阻抗 (EIS)、程序控温脱附质谱联用(TPD MS)等实验方法研究LiNi0. 8-yTiyCo0. 2O2电极材料钛离子的掺杂作用机理.结果表明,掺钛后的电极材料于充放电过程中的结构相变和晶格的膨胀收缩受到抑制,在高电位下的界面反应活性减弱,从而减小了由结构变化和界面反应引起的容量损失;同时,钛的掺杂增强了电极材料在脱锂状态下的结构稳定性,抑制了电极材料和电解液的分解或氧化反应,以上两个方面分别改善并提高了电极材料的充放电循环性能及其热稳定性.

关键词: 锂镍钴氧化物, 掺钛, 循环性能, 热稳定性, 正极材料, 锂离子电池

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

中图分类号:

TM911

刘汉三,李劼,龚正良,张忠如,杨勇. LiNi_(0.8-y)Ti_yCo_(0.2)O_2电极材料中钛离子掺杂作用机理的研究[J]. 电化学（中英文）, 2005, 11(1): 46-52.

LIU Han-san, LI Jie, GONG Zheng-liang, ZHANG Zhong-ru, YANG Yong~. The Mechanism of the Improvement on Cycling Performance and Thermal Stability of LiNi_(0.8)Co_(0.2)O_2 by Ti-doping[J]. Journal of Electrochemistry, 2005, 11(1): 46-52.

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https://electrochem.xmu.edu.cn/CN/Y2005/V11/I1/46

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