摘要
使用球磨/热解复合工艺制备锂离子电池用微米级硅/石墨/碳复合材料。因独特的结构,合成的硅/石墨/碳(20/50/30)复合材料在0.01~1.50 V充放电,电流为100 mA/g时表现出较高的首次库仑效率82.7%和882.6 mAh/g的首次可逆比容量,循环100次的容量保持率为85.6%。将硅/石墨/碳材料和商业化石墨混合,可获得循环性能更好的硅/碳复合材料,其中硅/石墨/碳(20/50/30)复合材料与石墨的质量比为3∶7时,得到的混合材料在0.01~1.50 V充放电,电流为50 mA/g时,具有501.7 mAh/g的首次可逆比容量和81.0%的首次库仑效率,循环100次的容量保持率为98.2%。
Micro-sized silicon/graphite/carbon composites were prepared via ball milling method in combination with pyrolysis reaction. Since the unique structure, the as-synthesized silicon/graphite/carbon （20/50/30） composite exhibited a high initial Coulombic efficiency of 82. 7% and a reversible specific capacity of 882. 6 mAh/g in 0.01 - 1.50 V at the current of 100 mA/g with a good capacity retention of 85.6% after 100 cycles. A series of silicon-carbon composites with better cycle performance could be obtained by mixing the silicon/graphite/carbon composite with the commercial graphite. When the mass ratio of silicon/graphite/ carbon （20/50/30） composite and graphite was 3： 7, the initial reversible specific capacity was 501.7 mAh/g and initial Coulombic efficiency was 81.0% while the obtained blend anode material was cycled in 0.01 - 1.50 V at the current of 50 mA/g,the capacity retention after 100 cycles was 98. 2%.
作者
潘庆瑞
左朋建
木天胜
尹鸽平
PAN Qing-rui;ZUO Peng-jian;MU Tian-sheng;YIN Ge-ping(School of Chemical Engineering and Technology,Harbin Institute of Technology,Harbin,Heilongfiang 150001,China)
出处
《电池》
CAS
CSCD
北大核心
2018年第4期223-227,共5页
Battery Bimonthly
关键词
石墨
彬石墨/碳复合材料
负极材料
锂离子电池
储锂性能
graphite
silicon/graphite/carbon composites
anode material
Li-ion battery
lithium storage performance
