The influence of graphene/carbon mass ratio on microstructure and electrochemical behaviour in the graphene-SnO2-carbon composite as anodes for Liion batteries
The influence of graphene/carbon mass ratio on microstructure and electrochemical behaviour in the graphene-SnO2-carbon composite as anodes for Liion batteries
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DOI：
10.1016/j.jallcom.2015.02.160
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发表时间：
2015-07
影响因子：
6.2
通讯作者：
Xiaoxiao Lu;Fan Yang;Yaming Wang;Xin Geng;P. Xiao
中科院分区：
文献类型：
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作者：
Xiaoxiao Lu;Fan Yang;Yaming Wang;Xin Geng;P. Xiao
采用一步水热法制备了石墨烯-SnO 2-无定形碳（Gr-SnO 2-C）复合材料，该材料具有固定的SnO 2含量和不同的石墨烯/无定形碳（Gr/C）质量比，可作为锂离子电池负极材料。Gr/C质量比为1：4的Gr-SnO 2-C在300 mA g−1的电流密度下显示出最佳的循环稳定性。然后，在50 mA g−1的低电流密度下，它在50次循环后显示出约878 mA h g− 1的可逆容量。通过研究Gr/C质量比对材料微观结构和电化学性能的影响，发现Gr/C质量比对材料的孔结构、活性物质的导电性和微观结构的稳定性均有影响。Gr-SnO 2-C复合材料性能的提高归因于石墨烯、无定形碳和SnO 2纳米颗粒之间的协同作用。
This paper reports a simplified one-step hydrothermal approach to prepare the graphene–SnO2–amorphous carbon (Gr–SnO2–C) composites which have a fixed SnO2content and various graphene to amorphous carbon (Gr/C) mass ratio as anode for Li-ion batteries. The Gr–SnO2–C with a Gr/C mass ratio of 1:4 shows the best cycling stability at a current density of 300 mA g−1. Then, at a low current density of 50 mA g−1, it reveals a reversible capacity of around 878 mA h g−1after 50 cycles. By studying the microstructure evolution and electrochemical performance as a function of the Gr/C mass ratio, it is discovered that the Gr/C mass ratio can affect the Gr–SnO2–C composites in the aspects of porous structures, conductivity of active materials and microstructural stability. The enhanced performance of the Gr–SnO2–C composites is attributed to the synergism between the graphene, amorphous carbon and SnO2nanoparticles.