华南理工大学学报(自然科学版) ›› 2012, Vol. 40 ›› Issue (1): 1-6.

• 化学化工、能源 •    下一篇

Ti掺杂对正极材料LiNi1/3 Co1/3 Mn1/3 O2 结构和电化学性能影响

肖新颜 汪冬   

  1. 华南理工大学 化学与化工学院，广东 广州 510640
  • 收稿日期:2011-06-23 修回日期:2011-08-31 出版日期:2012-01-25 发布日期:2011-12-01
  • 通信作者: 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
  • 作者简介: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．
  • 基金资助:

    广东省科技攻关项目( 2008B01080031)

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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摘要： 为研究离子掺杂对锂离子正极材料LiNi1/3 Co1/3 Mn1/3 O2的影响，采用氢氧化物共沉淀法制备了Ti4+ 掺杂改性的锂离子正极材料LiNi1/3-1/40  Co1/3 Mn1/3 Ti1/40 O2 、LiNi1/3-Co1/3-1/40 Mn1/3 Ti1/40 O2 和LiNi1/3 Co1/3 Mn1/3-1/40 Ti1/40 O2，并运用X 射线衍射仪和扫描电子显微镜对Ti 掺杂改性后正极材料的晶型和微观结构进行表征，通过高精度电池性能检测系统对正极材料的电化学性能进行检测． 结果表明: Ti 分别取代Ni、Co 和Mn 对三元复合正极材料进行掺杂改性后，改性材料都保持典型的α-NaFeO2层状结构，且晶型良好; LiNi1/3 -Co1/3 Mn1/3-1/40 Ti1/40 O2轮廓最分明，且形貌均一; 3 种改性材料的电化学性能均有一定程度的提高，其中LiNi1/3 Co1/3 Mn1/3-1/40 Ti1/40 O2提高最为明显，在0. 1 C、1. 0 C 和2. 0 C 倍率下其首次放电比容量分别为145. 35、140. 79 和125. 60 mA·h /g，1. 0 C 倍率下循环30 次后的容量保持率为88. 06%．

关键词: 正极材料, LiNi1/3 Co1/3 Mn1/3 O2, 钛掺杂改性, 微观结构, 电化学性能

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

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