水热合成Fe_2O_3/石墨烯纳米复合材料及其电化学性能研究

Hydrothermal Synthesis and Lithium Storage Properties of Fe_2O_3/Graphene Nanocomposites

利用水热法成功合成了Fe2O3/石墨烯(RGO)锂离子电池负极材料.导电性能良好的石墨烯网络起到连接导电性能极差的Fe2O3和集流体的作用.电化学性能测试表明,180℃下得到的Fe2O3/RGO具有良好的比容量和循环稳定性.在不同倍率充放电过程中,初始放电比容量为1023.6mAh/g(电流密度为40mA/g),电流密度增加到800mA/g时,放电比容量维持在406.6mAh/g,大于石墨的理论放电比容量～372mAh/g.在其他较高的电流密度下比容量均保持基本不变.该Fe2O3/RGO有望成为高容量、低成本、低毒性的新一代锂离子电池负极材料.

Fe2O3 nanoparticles on reduced grapheme oxide （RGO） sheets were successfully synthesized via hydro- thermal route for lithium ion battery applications. Selective growth of Fe2O3 nanoparticles on RGO sheets allowed for the electrically insulating Fe2O3 nanoparticles to be wired up to a current collector through the underlying conducting graphene network. The Fe2O3 nano-particles formed on RGO at 180 ℃ show good rate capability and cycling stability. During the charge and discharge process with different current density, the initial discharge ca- pacity was 1023.6 mAh/g （current density： 40 mA/g）. When the current density increased to 800 mA/g, the dis- charge capacity still retained at 406.6 mAh/g, higher than the theory capacity of grapheme-372 mAh/g, and the capacity retained stable in other relative high current density. The Fe2O3/RGO hybrid could be a promising can- didate material for a high-capacity, low-cost, and environmentally friendly anode for lithium ion batteries.