Electrochemical performance of MCMB/(AC+LiFePO_4) lithium-ion capacitors

查看全文 作　　者：PING [1]LiNa;ZHENG [1]JiaMing;SHI [2]ZhiQiang;QI [1]Jie;WANG [1]ChengYang

机构地区：[1]Key Laboratory for Green Chemical Technology of Ministry of Education,School of Chemical Engineering and Technology,Tianjin University;[2]Laboratory of Advanced Energy Materials and Devices,College of Materials Science and Engineering,Tianjin Key Laboratory of Fiber Modification and Functional Fiber,Tianjin Polytechnic University

出　　处：《Chinese Science Bulletin》索引2013年第58卷第6期,共7页

基　　金：supported by the National Natural Science Foundation of China (51172160,50902102);the National High Technology Research and Development Program of China (2011AA11A232);the National Basic Research Program of China (2012CB720302) 摘　　要：Lithium-ion capacitors(LICs) were fabricated using mesocarbon microbeads(MCMB) as a negative electrode and a mixture of activated carbon(AC) and LiFePO4 as a positive electrode(abbreviated as LAC).The phase structure and morphology of LAC samples were characterized by X-ray diffraction(XRD) and field emission scanning electron microscopy(FESEM).The electrochemical performance of the LICs was studied using cyclic voltammetry,charge-discharge rate measurements,and cycle performance testing.A LIC with 30 wt% LiFePO4 was found to have the best electrochemical performance with a specific energy density of 69.02 W h kg-1 remaining at 4 C rate after 100 cycles.Compared with an AC-only positive electrode system,the ratio of practical capacity to theoretical calculated capacity of the LICs was enhanced from 42.22% to 56.59%.It was proved that adding LiFePO4 to AC electrodes not only increased the capacity of the positive electrode,but also improved the electrochemical performances of the whole LICs via Li+ pre-doping. 关键词：电化学性能离子电容器 MCMB LAC 氟化锂场发射扫描电子显微镜 EPO 循环伏安法

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Electrochemical performance of MCMB/(AC+LiFePO_4) lithium-ion capacitors

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