离子液体作为共盐在高压超级电容器电解质中的作用。

The effect of ILs as co-salts in electrolytes for high voltage supercapacitors.

作者信息

Kwon Ha-Na, Jang Su-Jin, Kang Yun Chan, Roh Kwang Chul

机构信息

Energy Efficient Materials Team, Energy & Environmental Division, Korea Institute of Ceramic Engineering and Technology (KICET), Soho-Ro 101, Jinju-Si, Gyeongnam, 52581, Korea.

Department of Materials Science & Engineering, Korea University, Anam-dong, Seongbuk-Gu, Seoul, 02841, Republic of Korea.

出版信息

Sci Rep. 2019 Feb 4;9(1):1180. doi: 10.1038/s41598-018-37322-y.

DOI:10.1038/s41598-018-37322-y

PMID:30718616

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC6361913/

Abstract

Ionic liquids (ILs) which have electrical stability are attractive materials to enhance the potential window of electrolyte. According to the potential window is extended, available voltage for supercapacitor is broaden. In this study, the addition of ILs which is 1-ethyl-3-methylimidazolium tetrafluoroborate (EMIBF4) and 1-ethyl-3-methylimidazolium bis(trifluoromethylesulfonyl) imide (EMITFSI) as co-salts, to a supercapacitor electrolyte increases the ionic conductivity and stability of it due to inhibition of electrolyte decomposition. As a result, the electrochemical stability potential windows (ESPWs) of supercapacitor is improved and the supercapacitor exhibited increased cycling stability. The loss of specific capacitance upon addition of 7 wt% EMIBF4 or EMITFSI to the electrolyte was 2.5% and 8.7%, respectively, after 10,000 cycles at 3.5 V, compared to the specific capacitance of the initial discharge.

摘要

具有电稳定性的离子液体（ILs）是增强电解质电位窗口的有吸引力的材料。随着电位窗口的扩大，超级电容器可用电压变宽。在本研究中，向超级电容器电解质中添加作为共盐的离子液体1-乙基-3-甲基咪唑四氟硼酸盐（EMIBF4）和1-乙基-3-甲基咪唑双（三氟甲基磺酰）亚胺（EMITFSI），由于抑制了电解质分解，提高了其离子电导率和稳定性。结果，超级电容器的电化学稳定电位窗口（ESPWs）得到改善，并且超级电容器表现出更高的循环稳定性。在3.5 V下循环10000次后，与初始放电的比电容相比，向电解质中添加7 wt%的EMIBF4或EMITFSI后，比电容损失分别为2.5%和8.7%。