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Quasi-solid-state supercapacitors based on wide-temperature eutectogels
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DOI：10.1016/j.est.2022.106414.png)
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摘要
En 中文
Carbon-based supercapacitors possess fast charge-discharge rate, superior power density, and excellent cyclic lifespan, but it is subject to some problems, such as low operating potential window and energy density. To address these issues, a ternary deep eutectic solvent with a freezing point below -85.6 degrees C was firstly prepared using lithium perchlorate trihydrate and urea and then used as a reaction solvent to take part in a free radical polymerization reaction to prepare eutectogels. The optimized eutectogel showed an ionic conductivity of 20 mS cm(-1) at room temperature and could be still stretched and twisted even at -40 degrees C. The quasi-solid-state supercapacitor composed of a eutectogel and carbon electrodes demonstrated a stable voltage window of 0-2.0 V, an energy density of 10.76 Wh kg(-1) at a power density of 465 W kg(-1) and excellent cycling stability with similar to 105 % capacitance retention after 10,000 cycles. The flexible quasi-solid-state supercapacitors with such a eutectogel not only could be operated from -40 to 60 degrees C, but also exhibited a moderate bendability. Moreover, the damaged flexible quasi-solid-state supercapacitor could be still charged and drive a mini-fan for similar to 60 s. Therefore, the eutectogels displayed a promising potential for enhancing the energy density of carbon-based supercapacitors and should also provide instructive guidance for the preparation of wide-temperature gel polymer electrolytes.
Keyword:
Supercapacitor
Deep eutectic solvent
Gel polymer electrolyte
Wide temperature
期刊
IF:
9.8
论文数:
2.3W
被引数:
10.1W
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