Self-Assembled Fe2O3/Graphene Aerogel with High Lithium Storage Performance
Self-Assembled Fe2O3/Graphene Aerogel with High Lithium Storage Performance
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DOI：
10.1021/am400387t
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发表时间：
2013-05-08
影响因子：
9.5
通讯作者：
Feng, Xinliang
中科院分区：
文献类型：
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作者：
Xiao, Li;Wu, Dongqing;Feng, Xinliang
采用一锅法水热法制备了具有三维结构的石墨烯气凝胶（GA）负载的Fe 2 O3颗粒。Fe 2 O3颗粒均匀分散在石墨烯片上，并通过水热处理自组装成三维网络结构。该方法为大规模合成Fe 2 O3/GAs提供了一种简便、环境友好的方法。作为锂离子电池负极材料，Fe 2 O3/GAs在100 mA g（-1）充放电倍率下循环50次后，可逆容量达到995 mA h g（-1），在5000 mA g（-1）高倍率下，可逆容量甚至达到372 mA h g（-1）。Fe 2 O3/GAs优异的电化学性能可归因于均匀分散的Fe 2 O3颗粒和石墨烯气凝胶之间的协同作用，其中石墨烯的坚固的3D框架提供了具有大表面积和短扩散路径长度的高导电网络用于运输锂离子。
In this study, graphene aerogel (GA)-supported Fe2O3 particles with three-dimensional (3D) architecture was prepared by a one-pot hydrothermal process. Fe2O3 particles were dispersed uniformly on the graphene sheets, and the resulting composites self-assembled into a 3D network via hydrothermal treatment. This strategy provides a facile and environmentally friendly method for the large-scale synthesis of Fe2O3/GAs without any additional reductant. As the anode material for lithium ion batteries, the Fe2O3/GAs in this study manifested an excellent reversible capacity of 995 mA h g(-1) after 50 cycles at a charge-discharge rate of 100 mA g(-1) and even delivered reversible capacity as high as 372 mA h g(-1) at a high rate of 5000 mA g(-1). The outstanding electrochemical performance of Fe2O3/GAs can be attributed to the synergistic interaction between uniformly dispersed Fe2O3 particles and graphene aerogel, in which a robust 3D framework of graphene provided highly conductive networks with a large surface area and short diffusion path length for the transport of lithium ions.