Fluorine-Doped SnO2@Graphene Porous Composite for High Capacity Lithium-Ion Batteries

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• 作者：Jinhua Sun ; Linhong Xiao ; Shidong Jiang ; Guoxing Li ; Yong Huang ; Jianxin Geng
• 刊名：Chemistry of Materials
• 出版年：2015
• 出版时间：July 14, 2015
• 年：2015
• 卷：27
• 期：13
• 页码：4594-4603
• 全文大小：621K
• ISSN：1520-5002

文摘

For the first time, a composite of fluorine-doped SnO₂ and reduced graphene oxide (F-SnO₂@RGO) was synthesized using a cheap F-containing Sn source, Sn(BF₄)₂, through a hydrothermal process. X-ray photoelectron spectroscopy and X-ray diffraction results identified that F was doped in the unit cells of the SnO₂ nanocrystals, instead of only on the surfaces of the nanoparticles. F doping of SnO₂ led to more uniform and higher loading of the F-SnO₂ nanoparticles on the surfaces of RGO sheets, as well as enhanced electron transportation and Li ion diffusion in the composite. As a result, the F-SnO₂@RGO composite exhibited a remarkably high specific capacity (1277 mA h g^鈥? after 100 cycles), a long-term cycling stability, and excellent high-rate capacity at large charge/discharge current densities as anode material for lithium ion batteries. The outstanding performance of the F-SnO₂@RGO composite electrode could be ascribed to the combined features of the composite electrode that dealt with both the electrode dynamics (enhanced electron transportation and Li ion diffusion due to F doping) and the electrode structure (uniform decoration of the F-SnO₂ nanoparticles on the surfaces of RGO sheets and the three-dimensional porous structures of the F-SnO₂@RGO composite).