锑基合金/石墨烯纳米复合负极材料的制备及电化学性能研究
首发时间:2011-10-28
摘要:以氧化石墨、NiCl2o2H2O(或FeCl3o6H2O)和SbCl3作为原料,以NaBH4为还原剂,通过一步溶剂热法制备NiSb或FeSb2/石墨烯纳米复合材料。得到了尺寸均一的NiSb(20-30 nm)或FeSb2(约5 nm)纳米颗粒,该纳米颗粒被均匀地分布并约束于石墨烯薄片中,形成了独特的纳米复合结构。用恒电流充放电、循环伏安及电化学阻抗谱测定了复合材料的电化学性能。研究表明,由于引入的石墨烯的导电、分散及约束作用,复合材料的电化学性能要优于纯合金。
关键词: 锂离子电池 NiSb/石墨烯 FeSb2/石墨烯 负极材料 溶剂热合成
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Sb-Based Alloy (NiSb, FeSb2) Nanoparticles Decorated Graphene Prepared by One-Step Solvothermal Route as Anode for Li-Ion Batteries
Abstract:NiSb/graphene and FeSb2/graphene nanocomposites were fabricated by a facile one-step solvothermal route using graphite oxide, NiCl2?2H2O (or FeCl3o6H2O) and SbCl3 as the starting materials and NaBH4 as the reductant. NiSb (20-30 nm) and FeSb2 (around 5 nm) nanoparticles were uniformly dispersed and confined by the graphene sheets, forming a unique hybrid nanostructure. The electrochemical properties of the nanocomposite were investigated by galvanostatic cycling, cyclic voltammetry and electrochemical impedance spectroscopy. The nanocomposites exhibit an obvious enhanced electrochemical performance compared with bare alloys. The improvement in the electrochemical performance could be attributed to introduction of graphene that constructs a two-dimensional conductive network, uniformly disperses and confines the alloy particles and effectively buffers the volume changes.
Keywords: Li-ion batteries NiSb/graphene FeSb2/graphene Anode solvothermal route
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