摘要
采用砂磨机湿法研磨从鳞片石墨上剥落少量石墨烯和添加碳纳米管构建负极材料中的导电网络,通过喷雾干燥制备纳米硅-硬碳复合材料。借助激光粒度仪、XRD、SEM等分析制备的硅碳复合材料的结构与形貌。用制备的负极材料制备纽扣式半电池,并在不同模式下测试其电化学性能。结果表明,碳酸锂添加量为3%(质量分数)时,复合材料的性能最优,首次充放电容量为1279.9 mAh/g,效率高达84.5%,在200 mA/g电流密度下循环50次后容量仍能保持在68.8%。
Wet grinding with a sand mill exfoliated a small amount of graphene from flake graphite and added carbon nanotubes to realize the construction of conductive network in the negative electrode material.The nano silicon-hard carbon composite materials were prepared by spray drying.The structure and morphology of the prepared silicon-carbon composite materials were studied by means of laser particle size analyzer,XRD,SEM,etc.Using the prepared negative electrode materials to prepare button half-cells,and testing their electrochemical performance in different modes.The results show that when the amount of lithium carbonate added is 3wt%,the performance of the composite material is the best,the first charge and discharge capacity is 1279.9 mAh/g,the efficiency is as high as 84.5%,and at 200 mA/g current density,the capacity can still be maintained at 68.8%after 50 cycles.
作者
潘福森
沈龙
童磊
聂顺军
李虹
PAN Fusen;SHEN Long;TONG Lei;NIE Shunjun;LI Hong(Shanghai Shanshan Technology Co.,Ltd.,Research Institute,Shanghai 201209,China)
出处
《材料导报》
EI
CAS
CSCD
北大核心
2020年第S01期132-136,共5页
Materials Reports
关键词
锂离子电池
负极材料
纳米硅碳
纳米硅-硬碳
硅酸锂
lithium-ion battery
anode material
nano silicon carbon
nano silicon-hard carbon
lithium silicate
