Journal of South China University of Technology(Natural Science Edition) ›› 2012, Vol. 40 ›› Issue (1): 1-6.

• Chemistry,Chemical & Energy Engineering •     Next Articles

Effects of Ti Doping on Structure and Electrochemical Performance of Cathode Material LiNi1/3 Co1/3 Mn1/3 O2

Xiao Xin-yan  Wang Dong   

  1. School of Chemistry and Chemical Engineering,South China University of Technology,Guangzhou 510640,Guangdong,China
  • Received:2011-06-23 Revised:2011-08-31 Online:2012-01-25 Published:2011-12-01
  • Contact: 肖新颜( 1964-) ，男，教授，博士生导师，主要从事材料化学工程、环境化工等研究． E-mail:cexyxiao@scut.edu.cn
  • About author:肖新颜( 1964-) ，男，教授，博士生导师，主要从事材料化学工程、环境化工等研究．
  • Supported by:

    广东省科技攻关项目( 2008B01080031)

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Abstract:

In order to reveal the effects of ion doping on the structure and electrochemical performance of modified cathode material LiNi1/3 Co1/3 Mn1/3 O2 ,three kinds of Ti-doped cathode materials for lithium ion battery,namely LiNi1/3-1/40 Co1/3 Mn1/3 Ti1/40 O2 ,LiNi1/3 Co1/3-1/40 Mn1/3 Ti1/40 O2 and LiNi1/3 Co1/3 Mn1/3-1/40 Ti1/40 O2 ,were synthesized via the coprecipitation of hydroxides. Then,the crystal forms and microstructures of the products were respectively characterized by means of XRD and SEM,and the electrochemical performances of the products were tested by using a high-precision battery-testing system. The results show that all the modified cathode materials with their Ni,Co and Mn components being partly substituted by Ti keep a typical α-NaFeO2 layered structure with perfect crystalline patterns,that LiNi1/3 Co1/3 Mn1/3-1/40 Ti1/40 O2 is of the clearest profile and even morphology,that the electrochemical performances of the three kinds of modified materials all improve after the Ti doping,especially LiNi1/3 -Co1/3 Mn1/3-1/40 Ti1/40 O2 ,and that,for LiNi1/3 Co1/3 Mn1/3-1/40 Ti1/40 O2 at the rates of 0. 1C,1. 0C and 2. 0C,the first specific discharge capacity respectively reaches 145. 35,140. 79 and 125. 60mA·h /g,and the capacity retention after 30 charge and discharge cycles at 1. 0 C is up to 88. 06%.

Key words: Cathode materials, LiNi1/3 Co1/3 Mn1/3 O2, Ti-doping modification, microstructure, electrochemical performance