Long Period Operation of Ionic Liquid Based Electrical Double Layer Capacitor at 45 ℃ and 3 V

doi:10.12096/j.2096-4528.pgt.22116

Abstract

Abstract:

The long period operation at 45 ℃ and 3 V of the mesoporous carbon-ionic liquid-carbon covered aluminum foam based electrical double layer capacitor was studied. The composite electrode sheet was formed by embedding mesoporous carbon with carbon-coated aluminum foam, and the 3 cm×5 cm pouch was composed of EMIBF₄ as electrolyte. The operation law of charge and discharge was studied at 45 ℃ and 3 V for 1 500 h. It is found that the internal resistance change rate is about 10%, and the capacitance retention rate is as high as 98%, both of which are far better than those of organic liquid-based electrical double layer capacitor at 2.7 V and 65 ℃. The gas generation of pouches at 2.7 V/65 ℃ and 3 V/45 ℃ was compared. It is proved that the soft package of mesoporous carbon-ionic liquid-carbon-coated aluminum foam based electrical double layer capacitor can work stably at 3 V, 45 ℃ for 1 500 h. It provides a solid foundation for further promoting the application of ionic liquid-based electrical double layer capacitor.

Key words: energy storage, electrical double layer capacitor, ionic liquid, carbon-coated aluminum foam, mesoporous carbon, high temperature aging

CLC Number:

TK 02

Zhenzhen YE, Xinqi CHEN, Shuting ZHANG, Jian WANG, Chaojie CUI, Gang ZHANG, Lei ZHANG, Luming QIAN, Ying JIN, Weizhong QIAN. Long Period Operation of Ionic Liquid Based Electrical Double Layer Capacitor at 45 ℃ and 3 V[J]. Power Generation Technology, 2023, 44(2): 213-220.

Figures/Tables 4

Fig. 1 Morphology characterization of the composite electrode filled with aluminum foam, carbon coated aluminum foam, mesoporous carbon and mesoporous carbon

Fig. 2 Variation of the pouch-type supercapacitor performance with the time

Fig. 3 Aging experiment of pouch at 3 V and 45 ℃

Fig. 4 Study on gas production of the pouch-type supercapacitor

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