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作者

Zhang, Qingnuan Xu, Shan Wang, Yue Dou, Qingyun Sun, Yinglun Yan, Xingbin

作者单位

³Center of Industrial Analysis and Testing, Guangdong Academy of Science, Guangzhou, 510651, China 100081, China ⁴School of Physical Science and Technology, Lanzhou University, Lanzhou ¹Laboratory of Optoelectronic Materials and Technologies, School of Materials Science and Engineering, Sun Yat-Sen University, Guangzhou ⁵Medical Engineering and Technology Research Center, College of Radiology, Shandong First Medical University & Shandong Academy of Medical Sciences, Taian 271016, China 730000, China ²School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing 510275, China

刊名

Energy Storage Materials

年份

2023

卷号

Vol.55

页码

205-213

摘要

'Water-in-salt' electrolytes exhibit enlarged electrochemical stability windows compared to conventional dilute aqueous electrolytes, which helps to achieve high-voltage aqueous electrochemical energy storage devices. However, the ultra-high concentration of WIS electrolytes raises a serious concern about their temperature availability. Herein, we demonstrate the correlation of the temperature-dependent electrochemical performance of different-concentration electrolytes with their solvation str...更多

'Water-in-salt' electrolytes exhibit enlarged electrochemical stability windows compared to conventional dilute aqueous electrolytes, which helps to achieve high-voltage aqueous electrochemical energy storage devices. However, the ultra-high concentration of WIS electrolytes raises a serious concern about their temperature availability. Herein, we demonstrate the correlation of the temperature-dependent electrochemical performance of different-concentration electrolytes with their solvation structures and intermolecular interactions as elaborated via Raman spectroscopy and molecular dynamics simulations. The 21 m WIS electrolyte is advantageous in the high-temperature range of >25 °C, whereas the 5 m WIS electrolyte shows superior low-temperature performance, remaining a stable gel state even at −30 °C ascribed to the muscular hydrogen bond network. The electrochemical performance evaluation of carbon supercapacitors assembled with different-concentration WIS electrolytes further verify our findings. This study provides guidance to choose suitable WIS electrolytes for electrochemical energy storage devices working at different temperatures. © 2022收起

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