酚醛树脂包覆石墨化针状焦用作锂离子电池负极材料的研究  

Phenol-Formaldehyde Resin Coated Graphited Needle Coke as Cathode for Lithium Ion Batteries

作　　者：叶冉[1] 詹亮[1] 张秀云[2] 刘春法[2] 刘小军[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 [2]上海宝钢化工有限公司,上海200942

出　　处：《华东理工大学学报（自然科学版）》2010年第4期518-522,共5页Journal of East China University of Science and Technology

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)

摘　　要：通过对石墨化针状焦进行酚醛树脂包覆,提高其用作锂离子电池负极材料时的首次库仑效率和循环性能。结合X射线衍射(XRD)、扫描电子显微技术(SEM)等分析手段研究发现:未包覆的石墨化针状焦的首次充电容量和首次库仑效率分别为269 mA.h/g和55.0%;而经过w=10%酚醛树脂包覆的石墨化针状焦,其首次充电容量和首次库仑效率分别提高到327 mA.h/g和69.9%,且经20次充放电后的充电容量能稳定在299 mA.h/g,循环效率接近100%,表明酚醛树脂包覆能较好地改善石墨化针状焦的电极性能。In order to improve the first Coulomb efficiency and reversible capacity of graphited needle coke as cathode for lithium ion batteries, the surface of needle coke was coated by phenol-formaldehyde resin. According to the analysis of XRD, SEM and relative electrochemical performances, the first reversible capacity and Coulomb efficiency of coke as cathode were increased from 269 mA· h/g and 55.0% without coating to 327 mA ·h/g and 69. 9% coating with 10% resin, and the charge capacity remained at 299 mA· h/g and the cycle efficiency was close 100% even after 20 cycles of charge/ discharge. It means that the coating method can improve the electrochemical performance of graphited needle coke as cathode for lithium ion batteries.

关 键 词：锂离子电池 针状焦 酚醛树脂 

分 类 号：TB34[一般工业技术—材料科学与工程]