MoO2/C共包覆Si/石墨复合锂离子电池负极材料的研究  

MoO_2/C Co-coated Si/graphite Composite as Anode Materials for Lithium Ion Batteries

作　　者：尹红[1] 周丹[1] 丛丽娜[1] 谢海明[1] 仇永清[1] 

机构地区：[1]东北师范大学化学学院,动力电池国家-地方联合工程实验室,长春130024

出　　处：《高等学校化学学报》2015年第10期1990-1994,共5页Chemical Journal of Chinese Universities

基　　金：国家“八六三”计划项目(批准号:2013AA110103)资助~~

摘　　要：采用溶胶-凝胶法,用二氧化钼(MoO2)和C共同包覆Si/石墨粒子制备了Si/石墨/MoO2/C锂离子电池负极材料.利用X射线衍射(XRD)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)、循环伏安(CV)和电化学阻抗(EIS)等分析了材料的形貌和性质.结果表明,MoO2/C的共包覆在缓解材料体积膨胀的同时提高了材料的电子和离子电导率,进而提高了材料的电化学性能.复合材料的首次充电比容量为2494mA·h/g,首次库仑效率为72%,经过100次循环后比容量为636.6mA·h/g.A sol-gel method was used to fabricate MoO2 and C co-coated Si / graphite particles to form Si / graphite / MoO2/ carbon（ SGMC） composite as anode materials for lithium ion batteries. X-ray diffraction（ XRD）,scanning electron microscopy（ SEM）,transmission electron microscopy（ TEM）,cyclic voltammetry（ CV） and electrochemical impedance spectroscopy（ EIS） were utilized to characterize the morphology and properties of the composite. The MoO2/ C double coating has inhibited the volume expansion,improved the electronic conductivity and lithium ion mobility,and further improved the electrochemical performances.Electrochemical tests showed that the first charge capacities of SGMC composite was 2494 m A·h / g with an initial coulombic efficiency of 72%. The charge capacity maintained 636. 6 m A·h / g over 100 cycles.

关 键 词：MoO2/C共包覆Si/石墨 锂离子电池 溶胶-凝胶法 负极材料 

分 类 号：O646[理学—物理化学]