Li₄Ti₅O₁₂/graphene nanostructure for lithium storage with high-rate performance

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• 作者：Song Gyun Ri ; Liang Zhan ; Yun Wang ; Lihui Zhou ; Jun Hu ; Honglai Liu
• 关键词：Lithium titanate ; Graphene ; Ionic liquid ; Anode materials ; Lithium ion battery
• 刊名：Electrochimica Acta
• 出版年：30 October, 2013
• 年：2013
• 卷：109
• 期：Complete
• 页码：389-394
• 全文大小：1613 K

文摘

Nano-crystalline Li₄Ti₅O₁₂ with an average size of 18 nm was in situ grown on graphene sheets using ionic liquid of C₁₂H₂₃ClN₂ [Omim]Cl as the exfoliated agent. Such unique nanostructure provides a high electrode/electrolyte area for the electron transport and the nanosized Li₄Ti₅O₁₂ leads to a short path for the lithium ion transfer. When used as an anode material for lithium-ion battery, the Li₄Ti₅O₁₂/graphene nanostructure exhibits excellent reversibility (159 mAh g^鈭? at 0.5 C after 100 cycles) and high-rate performance (162 mAh g^鈭? at 0.2 C, 148.5 mAh g^鈭? at 20 C).