WO3纳米棒/石墨烯复合材料的制备及电化学储锂性能

摘要

以氯化钨和氧化石墨烯(GO)为原料,乙醇为溶剂,一步合成了WO3纳米棒/石墨烯纳米复合材料(WO3/RGO).将WO3/RGO纳米复合材料用于锂离子电池负极,并通过充放电测试、循环伏安(CV)和电化学阻抗谱(EIS)技术综合考察了该材料的储锂性能.结果显示,在0.1C (1C=638 mA∙g-1)倍率下,复合物的首次放电比容量达到761.4 mAh∙g-1,100次循环后可逆容量仍保持在635 mAh∙g-1,保持率为83.4%.即使在5C倍率下容量仍高达460 mAh∙g-1.由此说明, WO3/RGO纳米复合物具有优异的循环稳定性及倍率性能,可望用于高性能锂离子电池.%WO3 nanorods/graphene nanocomposites (WO3/RGO) were prepared by the solvothermal treatment of tungsten hexachloride and graphene oxide in alcohol. The electrochemical performance of WO3/RGO as anode materials for lithium-ion batteries was investigated by galvanostatic charge-discharge tests, cyclic voltammetry (CV), and electrochemical impedance spectroscopy (EIS). The discharge capacity of the composite at the first cycle was 761.4 mAh∙g-1, and about 635 mAh∙g-1 of reversible capacity remained after 100 cycles at a rate of 0.1C (1C=638 mA∙g-1). The corresponding retention rate was 83.4%. The reversible capacity remained lager than 460 mAh∙g-1 at a rate of 5C. WO3/RGO exhibited excellent cycling stability and rate performance, and has potential in advanced lithium-ion batteries.