纳米碳纤维作锂离子电池负极材料的嵌锂性能  

Lithium insertion performance of carbon nanofiber anode for lithium ion batteries

作　　者：刘鸿鹏[1] 乔文明[1] 詹亮[1] 凌立成[1] 

机构地区：[1]华东理工大学化学工程联合国家重点实验室,上海200237

出　　处：《电子元件与材料》2008年第11期64-66,73,共4页Electronic Components And Materials

基　　金：国家自然科学基金重点资助项目(No.50730003);国家自然科学基金资助项目(No.50672025);上海市科技创新资助项目(No.0706H1438);上海市"登山行动计划"基础研究重点资助项目(No.06JC14018);(No.065258033)

摘　　要：用化学气相沉积法(CVD)制备了纳米碳纤维,并通过2800℃高温处理得到石墨化纳米碳纤维。采用XRD、SEM和TEM对所制的材料进行微结构分析,并考察其作为锂离子电池负极材料的嵌锂性能。结果表明:纳米碳纤维初次嵌锂容量可达到533mA·h/g,25次循环后可逆容量保持在274mA·h/g,循环效率超过99%;经过石墨化处理以后,材料初次可逆容量达到311mA·h/g,首次循环效率从55%提高到78%,25次循环后可逆容量的保持率为99%以上。Carbon nanofiber was prepared by a catalytic chemical vapor deposition （CVD） process and graphitized at 2 800℃, and the microstructures of which were examined by XRD, SEM and TEM. Its lithium insertion performance as lithium ion batteries was tested. Results show that the first lithium insertion capacity of 533 mA · h/g for the carbon nanofiber, and a reversible capacity of 274 mA · h / g with a cyclic efficiency of above 99% are obtained after 25 cycles. After graphitization, the first reversible capacity is as high as 311 mA · h/g, the initial cyclic efficiency is increases from 55% to 78%. a reversible capacity retention rate is above 99% after 25 cycles.

关 键 词：电子技术 锂离子电池 负极材料 纳米碳纤维 嵌锂性能 

分 类 号：TM911[电气工程—电力电子与电力传动]