| Autor: |
Peng Zhang, Weili Zhang, Zhengjie Wang, Xuefei Wang, Qingjuan Ren, Shuai Zhang, Yujia Wang, Liang He, Pan Liu, Qingyin Zhang, Zhiqiang Shi |
| Jazyk: |
angličtina |
| Rok vydání: |
2023 |
| Předmět: |
|
| Zdroj: |
eScience, Vol 3, Iss 6, Pp 100184- (2023) |
| Druh dokumentu: |
article |
| ISSN: |
2667-1417 |
| DOI: |
10.1016/j.esci.2023.100184 |
| Popis: |
Aqueous electrolytes offer superior prospects for advanced energy storage. “Water-in-salt” (WIS) electrolytes exhibit a wide electrochemical stability window (ESW), but their low conductivity, high viscosity, and precipitation at low temperatures restrict their application. Herein, we report a novel localized “water-in-pyrrolidinium chloride” electrolyte (LWIP; 1 mol/L, N-propyl-N-methylpyrrolidinium chloride/(water and N,N-dimethylformamide, 1:4 by molality)) enabling high-voltage, low-temperature supercapacitors (SCs). The greatly improved ESW (3.451 V) is mainly attributed to the strong solvation between Cl− and water molecules, which broadens the negative stability. This water-binding mechanism is very different from that of a WIS electrolyte based on alkali metal salt. SCs using LWIP electrolytes not only yield a high operating voltage of 2.4 V and excellent capacity retention (82.8% after 15,000 cycles at 5 A g−1) but also operate stably at −20 °C. This work provides new approaches for the design and preparation of novel electrolytes. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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