锂离子电容器碳酸乙烯酯基电解液的研究  

The Ethylene Carbonate-Based Electrolyte of Lithium-Ion Capacitors

作　　者：王鹏磊 安亚斌 耿琳彬 孙现众[1,2] 张熊 马衍伟[1,2] WANG Penglei;AN Yabin;GENG Linbin;SUN Xianzhong;ZHANG Xiong;MA Yanwei(Institute of Electrical Engineering,Chinese Academy of Sciences,Beijing 100190,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院电工研究所,北京100190 [2]中国科学院大学,北京100049

出　　处：《华南师范大学学报（自然科学版）》2020年第6期22-27,共6页Journal of South China Normal University(Natural Science Edition)

基　　金：国家自然科学基金项目(51822706,51777200)。

摘　　要：采用2种碳酸乙烯酯基电解液制作了基于活性炭正极和软碳负极的软包装锂离子电容器(LICs),研究了器件的直流内阻、倍率、阻抗和循环稳定性等电化学性能.结果表明:通过向碳酸乙烯酯(EC)和碳酸二乙酯(DEC)的混合溶剂中加入碳酸丙烯酯(PC),得到双氟磺酰亚胺锂电解液(1.2 mol/L LiFSI∶(EC/PC/DEC)),可使LICs具有更低的内阻和更佳的倍率性能,而且低温下其电化学性能亦有显著提高.研究结果对于开发低内阻和低温LICs的电解液具有重要意义.Soft-packaged lithium ion capacitors(LICs)with activated carbon and soft carbon were assembled using two kinds of ethylene carbonate-based organic electrolytes.Their electrochemical performance,including DC internal resistance,C-rate,impedance spectra and cycleability,was studied.The results showed that the LICs with the lithium bis(fluorosulfonyl)imide salt(1.2 mol/L LiFSI∶(EC/PC/DEC)),which was obtained by adding propylene carbonate(PC)to the mixed solvent of ethylene carbonate(EC)and diethylene carbonate(DEC),possess lower internal resistance,better rate capability and higher low temperature performance.This can be significant for developing electrolytes for low internal resistance and low-temperature LICs.

关 键 词：锂离子电容器 碳酸乙烯酯基电解液 活性炭 软碳 低温性能 

分 类 号：O646[理学—物理化学]