高等学校化学学报

高等学校化学学报

• 研究论文 • 上一篇    下一篇

锂离子电池新型快充负极材料Li4Ti5O12的改性研究

于海英, 谢海明, 杨桂玲, 颜雪冬, 王荣顺   

  1. 东北师范大学化学学院功能材料化学研究所, 长春 130024
  • 收稿日期:2006-10-28 修回日期:1900-01-01 出版日期:2007-08-10 发布日期:2007-08-10
  • 通讯作者: 王荣顺

Modification Studies on the Novel Anode Material Li4Ti5O12 with Characteristic of Fleetly Charging for Lithium Ion Batteries

YU Hai-Ying, XIE Hai-Ming, YANG Gui-Ling, YAN Xue-Dong, WANG Rong-Shun*   

  1. Institute of Functional Material Chemistry, Faculty of Chemistry Northeast Normal University, Changchun 130024, China
  • Received:2006-10-28 Revised:1900-01-01 Online:2007-08-10 Published:2007-08-10
  • Contact: WANG Rong-Shun

PDF (PC)

摘要： 采用传统固相法制备尖晶石型Li4Ti5O12, 在前驱物中掺杂聚合物裂解碳材料聚并苯(PAS). 经四探针测试仪测量, 电导率提高9个数量级. 复合物的电化学性能测试结果表明, 其循环性和高倍率性能得到了明显改善.

关键词: 锂离子电池, 钛酸锂, 聚并苯, 复合物

Abstract: Spinel Li4Ti5O12 for the lithium ion battery was used as an anode material, during the process of Li+ intercalation and de-intercalation, its crystal structure did almost no change, so it is regarded as a “zero strain” material. But Li4Ti5O12 has a poor electric conductivity, only 10-9 S/cm, which affects its cycling stability and high rate characteristics. Here, Li4Ti5O12/polyacene (PAS) composite was prepared via a solid-state method using TiO2-anatase, Li2CO3, and polymer degradation carbonousPolyacene(PAS) as precursors. Doping with PAS greatly improved the electric conductivity and electrochemical performance over the pure Li4Ti5O12. The conclusion, which was measured by four-probe apparatus, showed that electric conducti-vity of the composite was enhanced for nine-magnitude order. The electrochemical tests indicated that the Li4Ti5O12 doping with mass fraction of 10% of PAS exhibited the initial specific capacity is 137.3 mA·h/g at 10C, and it is still 100 mA·h/g over 200 cycles.

Key words: Lithium ion battery, Lithium titanium oxide, Polyacene, Composite

中图分类号: 

TrendMD: