基于LiFePO4和活性炭的混合型电化学储能器件研究  

Development of hybrid electrochemical energy storage device based on LiFePO_4 and activated carbon

作　　者：张世明 车海英[1] 杨柯[1] 杨馨蓉 郑丹 马紫峰[1,2] ZHANG Shiming;CHE Haiying;YANG Ke;YANG Xinrong;ZHENG Dan;MA Zifeng(Department of Chemical Engineering,Shanghai Electrochemical Energy Device Research Center,Shanghai Jiao Tong University,Shanghai 200240,China;Shanghai Sinopoly Jiahua Battery Technology Co.,Ltd.,Sinopoly Battery Research Center,Shanghai 200241,China)

机构地区：[1]上海交通大学化学工程系,上海电化学能源器件工程技术中心,上海200240 [2]上海中聚佳华电池科技有限公司,中聚电池研究院,上海200241

出　　处：《储能科学与技术》2018年第2期86-93,共8页Energy Storage Science and Technology

基　　金：国家基础研究项目(2014CB239703);国家自然科学基金项目(21606149,21336003);中国博士后基金项目(2016M591678);上海市青年科技启明星计划(B类)(18QB1404400)

摘　　要：基于磷酸铁锂(LiFePO_4)和活性炭(AC)两种单体材料成功构建了磷酸铁锂/活性炭(LiFePO_4/AC)复合正极。进一步,通过优化LiFePO_4/AC复合电极中两种单体材料的质量比、选择亚微米尺寸的石墨为负极材料,组装了基于"LiFePO_4+AC/石墨"体系的电化学储能器件(锂离子电容器),同时制备了AC/AC超级电容器作为参照。研究表明,不同类型黏结剂对AC电极的电容特性影响非常显著,其中LA133水性黏结剂的电极性能优于油性黏结剂的;此外,制备的LiFePO_4/AC复合正极表现出了电容和电池的双重特性,且复合电极的构建有利于锂离子的嵌入和脱出。复合正极中LiFePO_4含量为40%(质量分数)时,构建的锂离子电容器比能量为AC/AC超级电容器的4倍(约40 W·h/kg,以活性材料质量计),可实现10 C快速充放电;5000次循环后,锂离子电容器和AC/AC超级电容器容量保持率相近,约为初始容量的75%。Mixed bi-material composite electrode based on LiFePO4 and activated carbon(AC)for hybrid electrochemical energy storage(EES)devices was prepared.The EES devices have been constructed by choosing submicron graphite as anode material and optimizing LiFePO4/AC composites with different mass ratios as the cathode.The results showed that binders had great influence on the capacitive properties of AC,and LA133 as one of the water-based binders should be better choice than oily adhesives.Furthermore,the prepared LiFePO4/AC composite cathodes emerged the dual characteristics of capacitor and battery.As the 40%(weight ratio)of LiFePO4 in the composite cathode,the lithium-ion capacitor could reveal high specific energy which is about 4 times comparing with that of AC/AC supercapacitor(about 40 W·h·kg-1)by computation of the total active materials.Also,it could achieve the fast charge-discharge at 10 C rate.In addition,both of the two devices exhibited the similar cyclability with about 75%of capacity retention after about 5000 cycles

关 键 词：锂离子电容器 亚微米石墨 LiFePO4/AC复合正极 水性黏结剂 快充 长寿命 

分 类 号：TM911[电气工程—电力电子与电力传动]