无机材料学报

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Pt元素添加提高LiCoO2的电化学性能

杜柯1; 其鲁1; 王银杰2; 张宏3   

  1. 1. 北京大学化学与分子工程学院新能源与技术实验室, 北京 100871; 2. 北京理工大学电子工程系,北京 100081; 3. 中国科学院上海微系统与信息技术研究所, 上海 200050
  • 收稿日期:2004-02-06 修回日期:2004-02-24 出版日期:2005-03-20 网络出版日期:2005-03-20

Improved Electrochemical Performance of LiCoO2 due to Pt Additive

DU Ke1; QI Lu1; WANG Yin-Jie2; ZHANG Hong3   

  1. 1. Department of Applied Chemistry; College of Chemistry & Molecular Engineering Peking University; Beijing 100871; China; 2.Department of Electronic Engineering; Beijing Institute of Technology; Beijing 100081, China; 3.Shanghai Institute of Microsystem and Information Technology; Chinese Academy of Sciences; Shanghai 200050; China
  • Received:2004-02-06 Revised:2004-02-24 Published:2005-03-20 Online:2005-03-20

摘要: 研究了Pt掺杂对LiCoO2电化学性能的影响.以氧化物形式将少量Pt元素引入到 LiCoO2中,发现形成了LiCoO2-Li2PtO3-Pt混合化合物系统.比较了纯LiCoO2和该LiCoO2 基复合材料的电化学性能,结果显示复合材料具有比纯LiCoO2材料优秀得多的倍率性能,表 明Li离子在该复合化合物中有更快的扩散速率,恒电流滴定实验结果也证明了这一点.

关键词: LiCoO2基复合材料, Pt元素添加, 放电倍率, 扩散

Abstract: The influence of the initial addition of Pt on the microstructure and electrochemical properties of synthesized LiCoO2-based material was investigated. A small amount of Pt additive induces Li2PtO3 and Pt in matrix LiCoO2 to form a multi-phase composite. This multi-phase composite shows the improved rate performance and cycleability at high rate in comparison with the single-phase of LiCoO2. This behavior is attributed to the enhanced diffusion of Li ion in the LiCoO2 matrix, which can be demonstrated by galvanostatic intermittent titration technique.

Key words: LiCoO2-based multi-phase composite, Pt element additive, discharge rate, diffusion

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