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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 17    No. 2    April 2007

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Effect of annealing treatment on electrochemical
property of LiNi0.5Mn1.5O4 spinel
ZHANG Bao(张 宝), WANG Zhi-xing(王志兴), GUO Hua-jun(郭华军)

School of Metallurgical Science and Engineering, Central South University,
Changsha 410083, China

Abstract:LiNi0.5Mn1.5O4 was prepared under different cooling conditions. The electrochemical properties of LiNi0.5Mn1.5O4 prepared under different cooling conditions were investigated. The results show that LiNi0.5Mn1.5O4 synthesized with or without annealing treatment has similar X-ray diffraction patterns that can be indexed to cubic spinel structure. The mass loss occurring above 650 ℃ during the heating process can be mostly gained during the cooling process. LiNi0.5Mn1.5O4 synthesized with an annealing treatment exhibits almost one voltage plateau at around 4.7 V and higher capacity with a quick fading upon cycling, whereas LiNi0.5Mn1.5O4 synthesized without annealing treatment shows two voltage plateaus at around 4.1 and 4.7 V and superior capacity retention upon cycling both at rates of 1/7C and 1C, though the capacity is not high.

 

Key words: lithium ion battery; cathode material; LiNi0.5Mn1.5O4; annealing treatment; electrochemical property

ISSN 1672-7029
CN 43-1423/U

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