Electrochemical performance of all-solid-state lithium secondary batteries improved by the coating of Li₂O–TiO₂ films on LiCoO₂ electrode

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• 作者：Atsushi Sakuda ; Akitoshi Hayashi ; Masahiro Tatsumisago
• 关键词：All-solid-state battery ; Lithium battery ; Solid electrolyte ; Surface coating
• 刊名：Journal of Power Sources
• 出版年：2010
• 出版时间：15 January 2010
• 年：2010
• 卷：195
• 期：2
• 页码：599-603
• 全文大小：641 K

文摘

All-solid-state lithium secondary batteries using LiCoO₂ particles coated with amorphous Li₂O–TiO₂ films as an active material and Li₂S–P₂S₅ glass-ceramics as a solid electrolyte were fabricated; the electrochemical performance of the batteries was investigated. The interfacial resistance between LiCoO₂ and solid electrolyte was decreased by the coating of Li₂O–TiO₂ films on LiCoO₂ particles. The rate capability of the batteries using the LiCoO₂ coated with Li₂Ti₂O₅ (Li₂O·2TiO₂) film was improved because of the decrease of the interfacial resistance of the batteries. The cycle performance of the all-solid-state batteries under a high cutoff voltage of 4.6 V vs. Li was highly improved by using LiCoO₂ coated with Li₂Ti₂O₅ film. The oxide coatings are effective in suppressing the resistance increase between LiCoO₂ and the solid electrolyte during cycling. The battery with the LiCoO₂ coated with Li₂Ti₂O₅ film showed a large initial discharge capacity of 130 mAh/g and good capacity retention without resistance increase after 50 cycles at the current density of 0.13 mA/cm².