3D porous LiFePO₄/graphene hybrid cathodes with enhanced performance for Li-ion batteries

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• 作者：Jinli Yang^a ; Jiajun Wang^a ; Dongniu Wang^a ; Xifei Li^a ; Dongsheng Geng^a ; Guoxian Liang^b ; Michel Gauthier^b ; Ruying Li^a ; Xueliang Sun^a ; ^{xsun@eng.uwo.ca}
• 关键词：Graphene nanosheet ; Hierarchical network ; LiFePO4 ; Lithium ion batteries
• 刊名：Journal of Power Sources
• 出版年：2012
• 期刊代码：58_03787753
• 类别：ce
• 出版时间：15 June, 2012
• 卷：208
• 期：Complete
• 页码：340-344
• 文件大小：578 K

摘要

Three-dimensional porous self-assembled LiFePO₄/graphene (LFP/G) composite was successfully fabricated using a facile template-free sol-gel approach. Graphene nanosheets were incorporated into the porous hierarchical network homogenously, which greatly enhances the electrical conductivity and efficient use of the LiFePO₄ (LFP), leading to an outstanding electrochemical performance of the hybrid cathodes. The obtained LFP/G composite has a reversible capacity of 146 mAh g^鈭? at 17 mA g^鈭? after 100 cycles, which is more than 1.4 times higher than that of porous LFP (104 mAh g^鈭?). Moreover, the porous LFP/G composite also exhibits a desirable tolerance to varied charge/discharge current densities.