详细信息

锂离子电池用Si/针状焦复合负极材料的改性及其电化学性能    

Modification and Electrochemical Performance of Si/Needle Coke as Anode Material for Lithium Ion Batteries

文献类型:期刊文献

中文题名:锂离子电池用Si/针状焦复合负极材料的改性及其电化学性能

英文题名:Modification and Electrochemical Performance of Si/Needle Coke as Anode Material for Lithium Ion Batteries

作者:叶冉[1];成果[1];詹亮[1];张秀云[2];刘春法[2];梁晓怿[1];乔文明[1];凌立成[1]

机构:[1]华东理工大学,化学工程联合国家重点实验室,上海200237;[2]上海宝钢化工有限公司,上海201900

年份:2010

卷号:28

期号:1

起止页码:44

中文期刊名:材料科学与工程学报

外文期刊名:Journal of Materials Science and Engineering

收录:CSTPCD;;北大核心:【北大核心2008】;CSCD:【CSCD2011_2012】;

基金:国家863重点资助项目(2008AA062302);国家自然科学基金资助项目(20806024,50672025,5073003);中国博士点基金资助项目(20070251008);上海市国际合作资助项目(08160704000);上海市大学生创新计划资助项目(yx0237102-07)

语种:中文

中文关键词:锂离子电池;针状焦;纳米Si;化学气相沉积

外文关键词:lithium ion battery; needle coke; nano Si; chemical vapor deposition

摘要:以石墨化针状焦为原料,采用机械球磨和化学气相沉积法(CVD)制得碳/Si/针状焦复合负极材料。结合XRD、SEM分析手段和电化学特征,研究发现:当石墨化针状焦复合20%的纳米Si后,其首次放电容量高达1110mAh/g,但25次循环后放电容量衰减为200mAh/g;采用CVD方法,在Si/针状焦复合材料的表面沉积厚度为6~8nm的碳后,其首次库伦效率为81%,25次循环后放电容量仍能稳定在860mAh/g,且循环效率接近99%。
Carbon/Si/needle coke composite anode material was prepared from graphitized needle coke by using ball-milling and chemical vapor deposition (CVD) method.According to the analysis of XRD,SEM and relative electrochemical performances,the first discharge capacity of Si/needle coke composite electrode obtained 1110mAh/g if nano Si was added with a weight ratio of 20%,but the discharge capacity reduced to 200mAh/g after 25 cycles.When the carbon was deposited on the surface of Si/needle coke composite with a thickness of 6~8nm by CVD,the first coulomb efficiency was 81% and the discharge capacity can still remain at 860mAh/g even if it was charge/discharged for 25 cycles.

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