Al₂O₃ coating on LiMn₂O₄ by electrostatic attraction forces and its effects on the high temperature cyclic performance

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• 作者：Won-Keun Kim ; Dong-Wook Han ; Won-Hee Ryu ; Sung-Jin Lim ; Hyuk-Sang Kwon ; ^{hskwon@kaist.ac.kr}
• 关键词：LiMn2O4 ; Al2O3 coating ; Mn dissolution ; Li-ion battery
• 刊名：Electrochimica Acta
• 出版年：2012
• 期刊代码：30_00134686
• 类别：ch
• 出版时间：1 June, 2012
• 卷：71
• 期：Complete
• 页码：17-21
• 文件大小：712 K

摘要

Bare LiMn₂O₄ was coated by a thin Al₂O₃ layer using electrostatic attraction forces to investigate the effects of the Al₂O₃ coating on the high-temperature cyclic performance of LiMn₂O₄. Transmission electron microscopy (TEM) studies indicated that 5-nm thin and amorphous Al₂O₃ layer formed uniformly on the surface of 2 wt.%Al₂O₃ coated LiMn₂O₄. The high-temperature cyclic performance of the LiMn₂O₄ was significantly improved by the coating. From the Electrochemical Impedance Spectroscopy (EIS) and X-ray Fluorescence (XRF) analysis, the coating reduced the charge transfer resistance and inhibited the Mn dissolution. The improved electrochemical performance of the Al₂O₃ coated LiMn₂O₄ was attributed to the decrease in the Mn dissolution by the coating.