Acta Phys. -Chim. Sin. ›› 2007, Vol. 23 ›› Issue (Supp): 5-9.doi: 10.3866/PKU.WHXB2007Supp02

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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

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


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