Hydrogen Bond Interaction in the Trade-Off Between Electrolyte Voltage Window and Supercapacitor Low-Temperature Performances.
ChemSusChem
; 15(14): e202200539, 2022 Jul 21.
Article
em En
| MEDLINE
| ID: mdl-35470971
ABSTRACT
Liquid electrolyte determines the voltage window and extreme working temperature of supercapacitors. However, the effect of weak interaction between electrolyte species on voltage window and low-temperature capacitive performance is unclear. Herein, an electrolyte model system with increasing H-bond interaction was constructed to clarify this concern. The results indicated that strong H-bond interaction was positively correlated with the number of hydroxyls, which was beneficial to expand voltage window, but deteriorated rate performance; weak H-bond improved low-temperature performance. Supercapacitors with an optimized electrolyte presented high voltage and good low-temperature performance; even at -40 °C, the maximum energy density could be maintained at 7.0â
Wh kg-1 (>80 % retention relative to at -20 °C). This study revealed the mechanism of the influence of the H-bonds on electrolyte voltage window and anti-freezing capability and provided a new insight for the design of electrolytes with both high working voltage and low-temperature performance.
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MEDLINE
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En
Ano de publicação:
2022
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Article