摘要
采用机械球磨和喷雾干燥-热解法制备Si/C复合负极材料。通过XRD、SEM和恒流充放电测试对材料的结构、形貌和电化学性能进行表征。结果表明:具有碳包覆结构的Si/C复合材料颗粒形貌近似球形。在100 m A/g的电流密度下充放电,首次放电比容量达到648.1 m Ah/g,首次充放电效率为77.2%,循环30周后,可逆比容量为528 m Ah/g。
Silicon/carbon composite anode material was prepared by ball milling and spray drying pyrolysis process.Then the structure,morphology and electrochemical property of the as-prepared composite materials were examined by X-ray diffraction(XRD),scanning electron microscopy(SEM)and galvanostatic charge/discharge testing.The results show that carbon-coated Si/C composite exhibits sphere-like particles with regular morphology.The discharge specific capacity is 648.1 mAh/g at a current density of 100 mA/g and the initial coulombic efficiency of 77.2%for the first cycle.After 30 cycles,the reversible specific capacity is 528 mAh/g.
作者
吴昊
肖方明
王英
唐仁衡
周荣锋
WU Hao;XIAO Fang-ming;WANG Ying;TANG Ren-heng;ZHOU Rong-feng(School of Materials Science and Engineering,Kunming University of Science and Technology,Kunming Yunnan 650093,China;Guangdong Province Key Laboratory of Rare Earth Development and Application,Guangzhou Guangdong 510650,China;Guangdong Research Institute of Rare Metals,Guangzhou Guangdong 510650,China)
出处
《电源技术》
CAS
CSCD
北大核心
2018年第7期941-943,共3页
Chinese Journal of Power Sources
基金
广东省自然科学基金(2014A030308015)
广东省省级科技计划项目(2015B010116002)
关键词
锂离子电池
Si/C负极材料
碳包覆
喷雾干燥
电化学性能
lithium-ion batteries
silicon/carbon composite anode material
carbon-coated
spray drying
electro-chemical performance
