碳源对Li3V2（PO4）3/C正极材料电化学性能的影响  

Effect of Carbon Source on the Electrochemical Performance of Li3V2（PO4）3/C Cathode Materials

作　　者：汪燕鸣 刘晓玉 王飞 WANG Yanming;LIU Xiaoyu;WANG Fei(School of Information,Huaibei Normal University,235000,Huaibei,Anhui,China)

机构地区：[1]淮北师范大学信息学院

出　　处：《淮北师范大学学报（自然科学版）》2019年第4期38-43,共6页Journal of Huaibei Normal University：Natural Sciences

基　　金：安徽省自然科学基金项目(1908085MB46);安徽高校自然科学研究项目(KJ2018ZD058);安徽高校优秀青年人才支持计划项目(gxyqZD2019096)

摘　　要：碳源是影响聚阴离子型锂离子电池正极材料电化学性能的关键因素之一.研究碳源对Li3V2(PO4)3正极材料晶体结构、形貌、颗粒尺寸、热解碳形态、导电性和电化学性能的影响.分别以聚丙烯腈、丹宁酸、没食子酸、葡萄糖酸内脂为碳源,通过碳热还原法制备Li3V2(PO4)3/C复合正极材料.结果表明,相比聚丙烯腈、丹宁酸,没食子酸、葡萄糖酸内脂为碳源制备的Li3V2(PO4)3/C具有更高的电化学活性和循环稳定性.在20 C的高倍率下,以葡萄糖酸内脂为碳源制备的Li3V2(PO4)3/C表现出最高的放电容量,这主要归于材料高的结晶度、导电性以及材料颗粒表面完整的包覆碳层.Carbon source is one of the key factors affecting the electrochemical properties of polyanionic cath ode materials for lithium ion batteries.In this paper,the effects of carbon source on the crystal structure,morphology,particle size,state of pyrolytic carbon,conductivity,and electrochemical performance of the Li3V2(PO4)3 materials were investigated.The Li3V2(PO4)3/C cathode materials were prepared by a carbothermal re duction method,using polyacrylonitrile,tannic acid,gallic acid,and gluconic acid lactone as carbon sources.Compared with polyacrylonitrile and tannic acid,gallic acid and gluconic acid lactone exhibit larger improvement for the electrochemical activity and cycling stability of Li3V2(PO4)3.The Li3V2(PO4)3/C,using gluconic acid lactone as carbon source,presents the largest discharge capacity at a super high rate of 20 C,which can be attributed to the high crystallinity,conductivity,and complete carbon coating layer on the particle surface.

关 键 词：锂离子电池 LI3V2(PO4)3 碳源 葡萄糖酸内脂 

分 类 号：TQ152[化学工程—电化学工业]