摘要
目的:寻找可代替锂离子电池负极碳材料的新合金材料,以提高锂离子电池性能。方法:以Hummers法处理的氧化石墨烯为原料,用原位还原法制备石墨烯的同时在其表面上沉积SnSb合金,得到SnSb/石墨烯复合材料。通过X线衍射(X ray diffraction,XRD)、扫描电子显微镜(scanning electron microscope,SEM)和透射电镜(transmission electron microscope,TEM)等方法对产物进行分析,用恒电流(constant current,CC)充放电、循环伏安(cyclic voltammetry,CV)实验测试了材料的电化学性能。结果:SnSb/复合材料形貌呈现纳米晶与非晶态的混合态,复合材料具有1 349.3 m Ah/g的首次放电比容量,首次库伦效率为58.4%,30次循环后容量仍保持516 m Ah/g。结论:单一SnSb合金的容量衰减较快,而对于SnSb/石墨烯复合材料,细小的合金颗粒均匀包覆在石墨烯的表面,部分改善了颗粒的团聚现象,同时石墨烯可以提高复合材料的导电性能,使材料的循环稳定性得到改善。
Objective To find a new alloy to replace the carbon material in lithium battery anode.Methods SnSb/grapheme nano composite was prepared by an in situ reduction method.This method reduced graphene oxide and deposited SnSb alloy at the same time.X ray diffraction（XRD）,scanning electron microscope（SEM） and transmission electron microscope（TEM） tests were used to analyze the material.The electrochemical performance was tested by constant current（CC） charge discharge and cyclic voltammetry（CV） experiments.Results It showed that SnSb/graphene appeared to be a mixture structure of crystalline and amorphous.The SnSb/grapheme composite exhibited initial discharge capacity of 1 349.3 mAh/g with a coulombic efficiency of 58.4%,and showed relatively good capacity retention of 516 mAh/g after 30 cycles.Conclusion This material experiences morphology of small SnSb grains coated on the surface of graphene which reduces inter-particle agglomeration partly.Compared with SnSb alloy,the cycle stability of SnSb/graphene is partly improved.
出处
《医疗卫生装备》
CAS
2016年第6期20-24,共5页
Chinese Medical Equipment Journal
基金
广东省高等学校科技创新项目(2013KJCX0050)
关键词
SnSb合金
石墨烯
电化学性能
负极
锂离子电极
SnSb alloy
graphene
electrochemical performance
anode
lithium-ion electrode
