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A moisture absorbing gel electrolyte enables aqueous and flexible supercapacitors operating at high temperatures
- Liu, Lingyang, Dou, Qingyun, Sun, Yinglun, Lu, Yulan, Zhang, Qingnuan, Meng, Jianing, Zhang, Xu, Shi, Siqi, Yan, Xingbin
- Journal of materials chemistry A 2019 v.7 no.35 pp. 20398-20404
- ambient temperature, durability, electrolytes, evaporation, gels, water uptake
- Gel electrolytes are of great importance for supercapacitors (SCs) operating at high temperatures. However, it is a fundamental challenge for SCs using aqueous gel electrolytes at elevated temperatures to ensure good work durability due to the evaporation of water. Here we report a “water-in-salt” gel electrolyte that exhibits superior water-retention and even water-absorption capability. What is noteworthy is that a quasi-solid-state SC utilizing the gel electrolyte is able to work and exhibit long cycling life across a wide temperature range from room temperature up to 120 °C in an extremely dry atmosphere, representing the best record among the previously reported aqueous gel-based SCs, as far as we know. This strategy may provide a new way to develop reliable aqueous gel electrolytes for SCs operating at high temperatures.