针状焦改性作为锂离子电池负极材料的研究  

Research of needle coke modified anode materials for lithium-ion battery

作　　者：焦妙伦 陈明鸣[1] 王成扬[1] 赵品一 

机构地区：[1]天津大学化工学院绿色合成与转化教育部重点实验室,化工学院协同创新中心,天津300350

出　　处：《电源技术》2018年第1期3-7,共5页Chinese Journal of Power Sources

基　　金：国家高技术研究发展计划资助项目＂863＂(SQ2014GX-01D01413)

摘　　要：通过对针状焦在750~2 200℃进行炭化处理,并将针状焦生焦进行沥青基两亲性炭材料(ACM)包覆,900℃炭化后继续用氢气对其还原处理,从而对针状焦材料的电化学性能进行了优化。利用扫描电子显微镜(SEM)、X射线衍射(XRD)和恒流充放电等方法对热处理及炭包覆还原处理的针状焦进行表面分析以及结构研究。实验结果表明:900℃炭化的针状焦具有较好的电化学性能,对其进行炭包覆以及氢气还原处理以后,针状焦基锂离子电池负极材料的首次库仑效率、倍率性能和循环性能均得到了一定的提高。Carbon coating followed by H2 reduction was used to improve electrochemical properties of calcined needle coke using as lithium ion battery(LIB) anode material. Needle coke were calcined in N2 at 750, 900, 1 300, 1 500,2 000 and 2 200 ℃, respectively. The carbon precursor for coating is an amphiphilic carbonaceous material oxidized from coal tar pitch. Scanning electron microscopy(SEM), X-ray diffraction patterns(XRD) and galvanostatic charge/discharge were carried out for the characterization of the resulted samples. NC@C-H900 sample of 3-10 μm in size has an average charge specific capacity of 357.9 mA h/g at 0.1 C(37.2 mA/g). Carbon coating and H2 reduction improve the sample's initial coulomb efficiency, rate performance and cycle stability.

关 键 词：针状焦 锂离子电池 ACM 包覆处理 氢气还原 

分 类 号：TM912.9[电气工程—电力电子与电力传动]