Porous SnO₂@C/graphene nanocomposite with 3D carbon conductive network as a superior anode material for lithium-ion batteries

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• 作者：Peichao Lian ; Jingyi Wang ; D ; an Cai ; Liangxin Ding ; Qingming Jia ; Haihui Wang
• 关键词：Graphene sheets ; SnO2 ; Carbon shell ; Nanocomposite ; Lithium-ion batteries
• 刊名：Electrochimica Acta
• 出版年：10 January, 2014
• 年：2014
• 卷：116
• 期：Complete
• 页码：103-110
• 全文大小：1970 K

文摘

Porous nano-sized SnO₂@C/graphene electrode material with three-dimensional carbon conductive network was designed and prepared. The carbon shell was introduced to suppress the aggregation of nanoparticles and undesired reactions. The excellent electronic conductivity can be guaranteed by a 3D carbon conductive network consisted of graphene sheets and carbon shell. The porous structure can facilitate liquid electrolyte diffusion into the bulk materials. As a result, the as-prepared SnO₂@C/graphene nanocomposite as an anode material for lithium-ion batteries exhibits high reversible specific capacity, outstanding cyclability and good rate capability. The first reversible specific capacity is as high as 1115 mAh g^鈭? at a specific current of 100 mA g^鈭?. After 100 cycles at different specific currents from 100 to 1000 mA g^鈭?, the reversible specific capacity was still maintained at 1015 mAh g^鈭? at the specific current of 100 mA g^鈭?. Even at the high specific current of 1000 mA g^鈭?, the reversible specific capacity is still as high as 499 mAh g^鈭?, higher than the theoretical specific capacity of the commonly used graphite anode material (372 mAh g^鈭?). The results give the clear evidence that the electrochemical performance of graphene-based electrode materials can be improved by designing proper structure. The preparation approach of porous SnO₂@C/graphene nanocomposite reported in this paper may also be applied to fabricate other porous metal oxide@C/graphene electrode materials for high performance lithium-ion batteries.