| INORGANIC MATERIALS AND CERAMIC MATRIX COMPOSITES |
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| Research Progress of Electrolytes for High-voltage Electrochemical Double-layer Capacitors |
| XU Guipei1, LIU Hao2,3, LAI Jiewen1, LU Yifeng1, HUANG Hui1, YI Zonglin2, DI Huifang2, WANG Zhenbing2, SU Fangyuan2, CHEN Chengmeng2,*
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1 Yunfu Power Supply Bureau of Guangdong Power Grid Corporation, Yunfu 527300, Guangdong, China
2 Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China
3 School of Chemical Engineering, University of Chinese Academy of Sciences, Beijing 100049, China |
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Abstract Electrochemical double-layer capacitors (EDLCs) have a wide application due to their advantages such as high power density, long cycle life, safety and reliability. However, lower energy density limits their development. To increase the energy density, widening the operating vol-tage window has been found to be the most effective method. The high voltage stability of the electrolyte is considered the main influencing factor of the operating voltage window of EDLCs. This paper provides a review of recent research progress on high voltage electrolytes for EDLCs, including aqueous electrolytes, organic electrolytes, ionic liquids, and gel electrolytes. The design of high voltage electrolyte components, including new solvent molecules and anions, and incorporating functional additives are discussed. The principles and the design of high voltage electrolyte of salt-in-water for aqueous electrolytes, functional additives for organic electrolytes, and anion/cation modulation for ionic liquids and gel electrolytes are highlighted. Finally suggestions for the issues challenging the development of high-voltage EDLC electrolytes are presented.
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Published: 10 May 2025
Online: 2025-04-28
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2025, Vol. 39 
