Research progress of solvent-in-salt electrolyte for supercapacitor

doi:10.11949/0438-1157.20191530

Abstract

Abstract:

Solvent-in-salt(SIS), as a new type of electrolyte, is highly concerned, where the electrolyte ions and solvent form a special solvated structure to passivate solvent and further inhibit solvent decomposition/polarization as well as reduce its reactivity. Benefiting from these characteristics including well electrochemical stability, wide work voltage window, SIS features unique and superior merits in supercapacitor, offering prospects of unprecedented advances in device performance. This article focuses on the principles and advantages of SIS-type electrolytes, combs the research progress of SIS as an electrolyte for supercapacitors in recent years, summarizes its existing problems, and looks forward to the future development direction of SIS-type electrolyte.

Key words: supercapacitor, solvent-in-salt electrolytes, voltage window, stability, solvation

摘要：

Solvent-in-salt (SIS)型电解液作为一类新型超浓缩电解液，主要由水或者有机溶剂和易溶盐组成，具有溶液溶剂化程度小、自由溶剂分子少、电化学窗口宽、电化学稳定性高等特点，在超级电容器中显示了独特的优势并展现了良好的应用前景。本文重点综述了SIS型电解液的原理和优势，梳理了近年来SIS作为超级电容器电解液的研究进展，总结了其存在的问题，同时展望了SIS型电解液未来的发展方向。

关键词: 超级电容器, solvent-in-salt型电解液, 电压窗口, 稳定性, 溶剂化

CLC Number:

TM 53

Le YANG, Jinhe YU, Rong FU, Yuanyang XIE, Chang YU, Jieshan QIU. Research progress of solvent-in-salt electrolyte for supercapacitor[J]. CIESC Journal, 2020, 71(6): 2457-2465.

杨乐, 余金河, 付蓉, 谢远洋, 于畅, 邱介山. 超级电容器用solvent-in-salt型电解液的研究进展[J]. 化工学报, 2020, 71(6): 2457-2465.

Figures/Tables 4

Fig.1 Work voltage window for different electrolytes(a), SIS electrolytes(b)

Fig.2 Timeline for development of SIS electrolytes [34,35,36,37,38,39]

Fig.3 Schematic diagram of process at different molar or mass ratios of electrolytes to solvent in NaOTF-H2O binary system[59]

Fig.4 Comparison diagram of environment of Li+ in different electrolytes[61]

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