Chem. J. Chinese Universities ›› 2011, Vol. 32 ›› Issue (4): 946.

• Articles • Previous Articles     Next Articles

Preparation of LiNi0.5Mn1.5O4 as 5 V Cathode Materials for Lithium Ion Battery and Diffusion  Performance of Li+ in the Materials

LU Hua-Quan, WU Feng, SU Yue-Feng*, LI Ning, CHEN Shi, BAO Li-Ying   

  1. School of Chemical Engineering & Environment, Beijing Institute of Technology, National Development Center of Hi-Tech Green Materials, Beijing 100081,   China
  • Received:2010-06-21 Revised:2010-10-19 Online:2011-04-10 Published:2011-03-09
  • Contact: SU Yue-Feng E-mail:suyuefeng@bit.edu.cn
  • Supported by:

    国家“九七三”计划项目(批准号: 2009CB220100)资助.

Abstract: 5 V cathode material LiNi0.5M1.5O4 was synthesized via an oxalate co-precipitation method, and the relationship between the structure, morphology and the electrochemical performance of the material were investigated. The results show that the sample synthesized at 900 ℃ has the best electrochemical performance, and its reversible capacity reaches 133.0 mAh?g-1. After 30 cycles, this LiNi0.5Mn1.5O4 sample maintains a discharge capacity of 132.2 mAh?g-1 with a capacity retention rate of 99.4%. The chemical diffusion coefficient of Li-ion in LiNi0.5M1.5O4 cathode material was measured by potentiostatic intermittent titration technique (PITT). It’s found that at the different voltage point of the discharge process, the change of Li content and the redox couple is also different, thus the chemical diffusion coefficient of Li-ion is various, it ranges in 10e-10 cm2?s-1~10e-11 cm2?s-1.

Key words: Lithium-ion batteries, Cathode material, Oxalate co-precipitation; LiNi0.5Mn1.5O4; Diffusion coefficient

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