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Long-Cycling Coated LiCoO₂ Cathodes for Lithium Batteries : A Review
Fey, George Ting-Kuo,Kumar, T. Prem 한국공업화학회 2004 Journal of Industrial and Engineering Chemistry Vol.10 No.7
The improved cycling properties of coated LiCoO₂cathodes are reviewed in this article. Three methods of coating: sol-gel, precipitation and mechano-thermal, are discussed. Both simple oxides such as Al₂O₃, SiO₂, TiO₂, ZrO₂, etc. and mixed oxides such as MgAl₂O₄ and ZrTiO₄ are compared as coating materials and, where possible, studies of nanomaterial coatings of the above are incorporated. Additionally, there is a brief comparison of the sol-gel and mechano-thermal coating methods. Structural data and morphology of the oxide-coated cathodes are correlated with electrochemical behavior. The enhanced cyclability is attributed to the suppression of cycle-limiting phase transitions. When a strong thin film of nanomaterial coating prevents the cathode from expanding structurally and dissolving into the electrolyte, cyclability is substantially enhanced. Furthermore, mixed oxide-coated cathodes demonstrate greater cycability than corresponding individual oxide-coated cathodes. Using Al₂O₃ as an example, the effect of precursor selection for the coating oxide on the cyclability of the coated cathodes is also discussed.