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research-article

Highly concentrated aqueous electrolyte with a large stable potential window for electrochemical double-layer capacitors

[+] Author and Article Information
Guoqing Zhang

Yangtze Normal University, 408100, Chongqing, China chongqing, 408000 China zhangguoqing@yznu.cn

Yongqing Zhao

College of Chemistry and Chemical Engineering, Lanzhou University Lanzhou, Gansu 730000 China yqzhao@lzu.edu.cn

Binbin Jin

16 Juxian Road, Chongqing, Fuling, China Chongqing, 408100 China bbjin001@126.com

Peng Zhang

16 Juxian Road, Chongqing, Fuling Chongqing, 408100 China 412711700@qq.com

Shuying Kong

16 Juxian Road, Chongqing, Fuling Chongqing, 408100 China 441746092@qq.com

1Corresponding author.

Manuscript received February 9, 2019; final manuscript received June 14, 2019; published online xx xx, xxxx. Assoc. Editor: Eui-Hyeok Yang.

ASME doi:10.1115/1.4044064 History: Received February 09, 2019; Accepted June 14, 2019

Abstract

An active carbon (AC)/AC electrochemical capacitor, taking advantage of a high concentrated lithium trifluoromethane sulfonate (LiTFS) or lithium bis(trifluoromethane sulfonyl) imide (LiTFSI) aqueous electrolyte, was demonstrated with an extended operating voltage of 2.5 V, which is the largest value till now for aqueous carbon-based capacitors. The AC electrode is entirely capacitive in these two electrolytes; and the stable potential window of single AC electrode can reach to -1.2 – 1.2 V vs. SCE. The performance of AC-based capacitor is evaluated in two- and three-electrode cells using a combination of electrochemical impedance (EIS), cyclic voltammetry (CV), galvanostatic discharge-charge (GDC), and self-discharge (SD, i.e., leakage current) measurements. At 0.5 mA·cm-2 charge-discharge rate, the AC/AC capacitor presents 5.5 wh·kg-1 and 4.5 wh·kg-1 energy density for 20 m LiTFS and LiTFSI electrolyte, respectively. The results suggest that thoroughly utilization of such lithium salt aqueous electrolyte with widening electrochemical stable potential window will no doubt lead to further development of electrochemical capacitors toward superior performance.

Copyright © 2019 by ASME
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