CAJ | 학술논문

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.
이록화오화양화석묵희(GO)위원료,을순위용제,일보합성료WO3납미봉/석묵희납미복합재료(WO3/RGO).장WO3/RGO납미복합재료용우리리자전지부겁,병통과충방전측시、순배복안(CV)화전화학조항보(EIS)기술종합고찰료해재료적저리성능.결과현시,재0.1C (1C=638 mA?g-1)배솔하,복합물적수차방전비용량체도761.4 mAh?g-1,100차순배후가역용량잉보지재635 mAh?g-1,보지솔위83.4%.즉사재5C배솔하용량잉고체460 mAh?g-1.유차설명, WO3/RGO납미복합물구유우이적순배은정성급배솔성능,가망용우고성능리리자전지.
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.