物理化学学报 >> 2007, Vol. 23 >> Issue (Supp): 5-9.doi: 10.3866/PKU.WHXB2007Supp02

研究论文 上一篇    下一篇

新型Li4Ti5O12/LiMn2O4体系的电化学性能

吴可; 王印萍; 王剑; 李永伟; 安平; 其鲁   

  1. 中信国安盟固利新能源科技有限公司, 北京 102200； 北京大学化学与分子工程学院应用化学系, 新能源材料与技术实验室, 北京 100871
  • 收稿日期:1900-01-01 修回日期:1900-01-01 发布日期:2008-01-04
  • 通讯作者: 王剑 E-mail:miller_wj@yahoo.com.cn

Electrochemical Performance of Novel Li4Ti5O12/LiMn2O4 System

WU Ke; WANG Yin-Ping; WANG Jian; LI Yong-Wei; AN Ping; QI Lu   

  1. CITIC Guoan Mengguli New Energy Technology Co. Ltd., Beijing 102200, P. R. China; New Energy Materials and Technology Laboratory, Department of Applied Chemistry, College of Chemical and Molecular Engineering, Peking University, Beijing 100871, P. R. China
  • Received:1900-01-01 Revised:1900-01-01 Published:2008-01-04
  • Contact: WANG Jian E-mail:miller_wj@yahoo.com.cn

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摘要： 开发了采用Li4Ti5O12/LiPF6/EC+EMC+DMC(质量比1:1:1)/LiMn2O4体系的18650型锂离子电池, 通过恒流充放电实验和差分计时电位分析等方法, 研究了该体系的电化学性能并测试了体系的抗过充和热滥用性能. 结果表明, 所研究体系的电池的质量比能量为60 Wh·kg-1, 能量密度为150 Wh·L-1, 电池常温1C(1000 mA)循环1000 次(100%DOD(放电深度))后容量仍保持95%以上, 60 ℃高温1C循环寿命大于250 次, 具有优异的常温和高温循环性能. 安全测试结果表明, 该体系具有良好的安全性能.

关键词: 锂离子二次电池, Li4Ti5O12, LiMn2O4

Abstract: A novel Li4Ti5O12/LiPF6/EC+EMC+DMC (1:1:1 mass ratio)/LiMn2O4 lithium battery of 18650 type was developed and the electrochemical performance of the system was investigated through constant current charge-discharge test and differential chronopotential method, the abuse tolerances of overcharge and overheat were tested as well. The results showed that the cell using this system owns 60 Wh·kg-1 specific energy and 150 Wh·L-1 power density, 95%of initial capacity retained after 100%DOD (depth of discharge)1000 cycles at 1C(1C=1000 mA) rate and more than 250 cycle life at 60 益 which indicates excellent cycle performance in both room and high temperatures. The abuse tests showed that the systemalso had good safety performance.

Key words: Lithium-ion secondary battery, Li4Ti5O12, LiMn2O4

MSC2000: 

  • O646