Pt元素添加提高LiCoO_2的电化学性能  

Improved Electrochemical Performance of LiCoO_2 due to Pt Additive

作　　者：杜柯[1] 其鲁[1] 王银杰[2] 张宏[3] 

机构地区：[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

出　　处：《无机材料学报》2005年第2期351-358,共8页Journal of Inorganic Materials

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.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.

关 键 词：LiCoO2基复合材料 Pt元素添加 放电倍率 扩散 

分 类 号：TM912[电气工程—电力电子与电力传动]