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Molten salt electrolytes for electrochemical capacitors with energy densities exceeding 50 W h kg−1
Energy & Environmental Science ( IF 32.4 ) Pub Date : 2022-11-02 , DOI: 10.1039/d2ee01969h
Kuangyu Wang 1 , Ziyao Chen 1 , Kai Liu 2 , Cheng Yang 3 , Haitian Zhang 4 , Yulong Wu 1 , Yuanzheng Long 1 , Hanlin Liu 1 , Yang Jin 5 , Meicheng Li 2 , Hui Wu 1
Affiliation  

Electrochemical capacitors (ECs) are promising energy storage devices due to their superior power density and outstanding cycling stability. The development of EC electrolytes is of key importance to further promote their energy density and overall performance. Herein, we report molten salts as a new electrolyte category for ECs with superior performance. The molten-salt-based EC (MS-EC) device assembled with an AlCl3–NaCl–LiCl electrolyte and activated carbon electrodes provided an ultrahigh energy density of 50.4 W h kg−1 at a power density of 1.1 kW kg−1 at 125 °C. The energy storage process is clarified to follow a physisorption–chemisorption combined mechanism originating from electrolyte nanoconfinement effects. MS-ECs also demonstrate high cycling stability (99.8% capacitance retention after 10 000 cycles), low cost, and capability for long-duration energy storage (over 90% voltage retention after 25 days at room temperature). This study provides insights into the research on energy storage mechanisms and broadens the application field of ECs.

中文翻译:

用于能量密度超过 50 W h kg-1 的电化学电容器的熔盐电解质

电化学电容器(ECs)因其卓越的功率密度和出色的循环稳定性而成为很有前途的储能器件。EC电解质的开发对于进一步提高其能量密度和整体性能至关重要。在这里,我们将熔盐报告为具有卓越性能的 EC 的新电解质类别。由 AlCl 3 -NaCl-LiCl 电解质和活性炭电极组装而成的熔盐基 EC (MS-EC) 装置在 1.1 kW kg -1 的功率密度下提供了 50.4 Wh kg -1的超高能量密度在 125 °C。储能过程被阐明遵循源自电解质纳米限制效应的物理吸附-化学吸附联合机制。MS-EC 还表现出高循环稳定性(10 000 次循环后 99.8% 的电容保持率)、低成本和长期储能能力(在室温下 25 天后保持超过 90% 的电压)。该研究为储能机制的研究提供了见解,拓宽了EC的应用领域。
更新日期:2022-11-02
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