摘要
为提升石墨破碎料的储锂容量,通过有机裂解碳将纳米硅粉包覆在石墨破碎料表面,制备石墨@硅(G@Si)复合负极材料,分析纳米硅、石墨破碎料及G@Si复合材料的电化学性能。相比纳米硅粉,G@Si复合材料的循环稳定性和库仑效率更高;相比石墨,纳米硅粉的引入,可提升复合材料的可逆储锂容量并改善大电流嵌锂能力。G@Si复合材料的电化学性能较好,在100 mA/g的电流放电至0.010 V、10 mA/g的电流放电至0.005 V,100 mA/g的电流充电至1.500 V时,首次可逆比容量为854.2 mAh/g,首次库仑效率为89.78%,第100次循环的比容量为511.4 mAh/g。
In order to enhance the lithium storage capacity of graphite crushed material,the graphite@silicon(G@Si)composite anode material is prepared by coating nanoscale silicon powder on the surface of graphite crushed material using organic pyrolysis carbon.The electrochemical performance of the nanoscale silicon,graphite crushed material and G@Si composite material is analyzed.The G@Si composite material has better cycle stability and Coulombic efficiency compared to nanoscale silicon powder.Compared with graphite,the nanoscale silicon powder can enhance the reversible lithium storage capacity of the composite material and improve the embed lithium ability at high current.The electrochemical performance of G@Si composite material is better,the initial reversible specific capacity is 854.2 mAh/g with the initial Coulombic efficiency of 89.78%,the reversible capacity after 100 cycles is 511.4 mAh/g,under discharging at 100 mA/g to 0.010 V,discharging at 10 mA/g to 0.005 V and charging at 100 mA/g to 1.500 V.
作者
单志强
张伟超
刘文平
秦海青
雷晓旭
SHAN Zhiqiang;ZHANG Weichao;LIU Wenping;QIN Haiqing;LEI Xiaoxu(Municipal Key Laboratory of Resource Utilization of Retired,Liuzhou Polytechnic University,Liuzhou 545000,Guangxi,China;School of Materials Science and Engineering,Guilin University of Electronic Technology,Guilin 541000,Guangxi,China;Guangxi Key Laboratory of Superhard Material,National Engineering Research Center for Special Mineral Material,Guangxi Technology Innovation Center for Special Mineral Material,China Nonferrous Metal(Guilin)Geology and Mining Co.,Ltd.,Guilin 541004,Guangxi,China)
出处
《电池》
北大核心
2025年第3期536-541,共6页
Battery Bimonthly
基金
中央引导地方科技发展资金项目(ZY20220102)
广西重点实验室运行补助计划(22-035-35)
柳州市科技计划项目(2022CCC0201)
中国有色集团科技专项(2022KJZX04)
桂林市重点研发计划项目(20220110-1)
桂林市创新平台和人才计划(20220120-5)。
