分散剂对油性石墨烯导电浆料性能的影响及其在锂电池中的应用  

Effect of Dispersant on Properties of Oil-based Graphene Conductive Paste andIts Application in Lithium Batteries

作　　者：吴永健 唐仁衡 欧阳柳章 李文超 王英 黄玲 WU Yongjian;TANG Renheng;OUYANG Liuzhang;LI Wenchao;WANG Ying;HUANG Ling(Guangdong Provincial Key Laboratory of Advanced Energy Storage Materials,School of Material Science and Engineering,South China University of Technology,Guangzhou 510641,China;Guangdong Provincial Key Laboratory of Rare Earth Development and Application,Guangdong Research Institute of Rare Metals,Guangzhou 510650,China)

机构地区：[1]华南理工大学材料科学与工程学院,广东省先进储能材料重点实验室,广州510641 [2]广东省稀有金属研究所,广东省稀土开发及应用重点实验室,广州510650

出　　处：《材料导报》2020年第12期12030-12035,共6页Materials Reports

基　　金：广州市科技计划项目(201802020029);广东省科技计划项目(2017B030314081);广东省稀土产业技术创新联盟平台(2017B090907026);广东省科学院能力建设专项项目(2017GDASCX-0110;2018GDASCX-0110)。

摘　　要：本工作主要探讨不同分散剂在油性体系中对石墨烯分散稳定性的影响,并将获得的导电浆料应用在磷酸铁锂正极,研究其电化学性能。结果表明,与常用的分散剂聚乙烯吡咯烷酮(PVP)和未做分散处理的导电浆料相比,采用BYK-2150和KD1作为分散剂时,石墨烯在悬浮液中的分散浓度和分散稳定性均有显著提升。同时,使用两种导电浆料制备的磷酸铁锂电池显示出良好的电化学性能。以0.2C倍率充放电时,两电池的放电比容量分别达到150.7 mAh/g、156.1 mAh/g,首次放电效率分别为94.4%、97.7%。以1C倍率放电循环50次后,电池的放电比容量仍保持在152.5 mAh/g、159.7 mAh/g。In this paper,we mainly discuss the effects of different dispersants on the stability of graphene dispersion in oily systems,and apply obtained conductive slurries with different dispersants on LiFePO 4(LFP)cathode to investigate their electrochemical performance.Test results show that the dispersion concentration and stability of graphene treated by dispersant BYK-2150 and KD1 in suspension are much better than ordinary dispersant polyvinylpyrrolidone(PVP).In addition,the batteries used BYK-2150 and KD1 conductive slurry exhibit a specific discharge capacity of 150.7 mAh/g and 156.1 mAh/g and the first discharge efficiency of 94.4%and 97.7%at 0.2C,respectively.After 50 cycles,their specific discharge capacity is 152.5 mAh/g and 159.7 mAh/g at 1C,respectively.

关 键 词：石墨烯 分散剂 导电浆料 油性体系 锂离子电池 

分 类 号：TQ610.42[化学工程—精细化工]