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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 ⁶Medical Engineering and Technology Research Center, College of Radiology, Shandong First Medical University, Shandong Academy of Medical Sciences, Taian ⁵School of Chemical Engineering, Sungkyunkwan University, 2066 Seoburo, Jangan-gu, Suwon 100081, China ⁴School of Physical Science and Technology, Lanzhou University, Lanzhou 440-746, Korea, Republic of ¹Laboratory of Optoelectronic Materials and Technologies, School of Materials Science and Engineering, Sun Yat-Sen University, Guangzhou 271016, China 730000, China ²School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing 510651, China 510275, China

刊名

SSRN

年份

2022

ISSN

1556-5068

摘要

'Water-in-salt' electrolytes can enlarge the electrochemical stability window of aqueous electrolytes, and thus help to achieve safe and high-voltage aqueous electrochemical energy storage devices. WIS electrolytes use highly concentrated salts, which raises an important concern about the temperature availability. Here we demonstrate the temperature-dependent structure and performance evolution of LiTFSI/H 2 O electrolytes with different concentrations ) using Raman spectroscopy and molecular d...更多

'Water-in-salt' electrolytes can enlarge the electrochemical stability window of aqueous electrolytes, and thus help to achieve safe and high-voltage aqueous electrochemical energy storage devices. WIS electrolytes use highly concentrated salts, which raises an important concern about the temperature availability. Here we demonstrate the temperature-dependent structure and performance evolution of LiTFSI/H 2 O electrolytes with different concentrations ) using Raman spectroscopy and molecular dynamics simulations. The 21 m WIS electrolyte is advantageous in the high-temperature range , but the 5 m WIS electrolyte remains stable gel state until the temperature drops to -40 °C due to the muscular hydrogen bond network. Above 15-20 °C, the side reactions are more seriously in the all-concentrated electrolytes due to the destruction of intermolecular interaction. The electrochemical performance evaluation of carbon supercapacitors assembled with these three electrolytes further verify our findings. This work provides guidance to select suitable WIS electrolytes for electrochemical energy storage devices that will be used at different temperature applications. © 2022, The Authors. All rights reserved.收起

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