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| 锂离子电池正极材料LiMn2O4的改性研究 | |
| 引用本文： | 周艺峰,聂王焰,陈春华,水江澜. 锂离子电池正极材料LiMn2O4的改性研究[J]. 功能材料, 2006, 37(9): 1381-1385 |
| 作者姓名： | 周艺峰 聂王焰 陈春华 水江澜 |
| 作者单位： | 安徽大学,化学化工学院,安徽,合肥,230039;中国科学技术大学,材料科学与工程系,安徽,合肥,230026 |
| 摘 要： | 分别采用过渡元素掺杂和不同聚合物(聚丙烯晴和聚噻吩)包覆的方法对锂离子电池用正极材料LiMn2O4进行改性,研究了改性前后LiMn2O4的电化学性能.结果表明采用掺杂改性和聚合物包覆改性都可以提高LiMn2O4的电化学性能,减缓容量衰减.但单纯用一种方法改性效果都不理想,而将两种方法结合起来使用则不仅能有效地阻止电池在室温下的容量衰减(在前60个循环中,改性前电池的放电容量从119.1mAh/g下降到99.6mAh/g,平均每个循环的容量衰减率为0.27%,经Cr元素掺杂再用聚丙烯腈包覆后电池的放电容量从94.6mAh/g下降到91.8mAh/g,平均每个循环的容量衰减率为0.05%),而且使电池在高温下(60oC)也有很好的循环性能. |
| 关 键 词： | 锂离子电池 锰酸锂 掺杂 包覆 改性研究 |
| 文章编号： | 1001-9731(2006)09-1381-05 |
| 收稿时间： | 2005-11-29 |
| 修稿时间： | 2006-02-28 |
The modification of cathode material LiMn2O4 for lithium-ion batteries |
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| ZHOU Yi-feng,NIE Wang-yan,CHEN Chun-hua,SHUI Jiang-lan. The modification of cathode material LiMn2O4 for lithium-ion batteries[J]. Journal of Functional Materials, 2006, 37(9): 1381-1385 | |
| Authors: | ZHOU Yi-feng NIE Wang-yan CHEN Chun-hua SHUI Jiang-lan |
| Affiliation: | 1. School of Chemistry and Chemical Engineering, Anhui University, Hefei 230039, China; 2. Dept. of Materials Science and Engineering, University of Science and Technology of China, Hefei 230026, China |
| Abstract: | Spinel LiMn2O4 is regarded as the most promising cathode material for lithium-ion batteries because of its low cost and environmental friendly nature over LiCoO2. In this paper, the electrochemical performance of LiMn2O4 was improved by doping with chromium and coating with polymers. Its electrochemical characteristics were measured before and after the modifications. The results showed that both of coating and doping could suppress the capacity fading of LiMn2O4 and improve its electrochemical characteristics. Nevertheless, only one way cannot achieve the best effect until both are used. With the combination of these two modification approaches we can not only stop the capacity fade of LiMn2O4 at room temperature, but also stabilize its cycling performance at high temperature. |
| Keywords: | lithium-ion batteries LiMn2O4 doping coating modification |
| 本文献已被 CNKI 维普 万方数据 等数据库收录！ | |