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Citation: YU Bing-Chuan, WU Hong-Te, YANG Guang-Zhong. Synthesis and Properties of SiO₂-Modified LiMn₂O₄ Cathode Material[J]. Chinese Journal of Applied Chemistry, ;2006, 23(4): 378-381. shu

Synthesis and Properties of SiO₂-Modified LiMn₂O₄ Cathode Material

1.
a College of Chemistry and Environmental Engineering, Yangtze University, Jingzhou 434023;
2.
b Supervision Institute of Shashi Branch Bureau, Jingzhou Environment Protection Bureau, Jingzhou

Corresponding author: YU Bing-Chuan,
Received Date: 24 May 2005
Available Online: 23 October 2005

In order to improve electrochemical performance of LiMn₂O₄ as a cathode material for lithium ion batteries at a high temperature(55℃),a stable SiO₂ film was coated on the surface of LiMn₂O₄ cathode material by sol-gel method from Si(OCH₂CH₃)₄.The structures of the coated and uncoated LiMn₂O₄ were characterized by XRD and SEM. The results show that the SiO₂ layer can reduce the direct contact between LiMn₂O₄ and the electrolyte,and thus effectively suppress the undesirable interactions between them at elevated temperatures.At 55℃,the surface modified LiMn₂O₄ cathode material can stabilize the cycling performance and largely reduce the self-discharge of the battery.
- lithium ion battery,
- cathode material,
- spinel,
- LiMn₂O₄,
- coat
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Synthesis and Properties of SiO₂-Modified LiMn₂O₄ Cathode Material