锂离子电容器碳酸乙烯酯基电解液的研究

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.

The Ethylene Carbonate-Based Electrolyte of Lithium-Ion Capacitors

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.