Biopolymer-based gel electrolytes with an ionic liquid for high-voltage electrochemical capacitors
[ 1 ] Instytut Chemii i Elektrochemii Technicznej, Wydział Technologii Chemicznej, Politechnika Poznańska | [ P ] pracownik
2022
artykuł naukowy
angielski
- Gel polymer electrolyte
- Cellulose
- Chitin
- Ionic liquid
- Supercapacitor
EN This paper reports on the preparation, characterization, and electrochemical performance of the novel, nonaqueous biopolymer-based gel electrolytes with an ionic liquid for high-voltage electrochemical capacitors. The quasi solid-state electrolytes contain a biopolymer matrix, made of cellulose or chitin, and ionic liquid (IL), 1-ethyl-3-methylimidazolium tetrafluoroborate (EMImBF4), which acts as a plasticizer and an ionic conductor. The gel biopolymer electrolytes were prepared by a novel, but simple method. It was based on the casting so- lution technique with an intermediate step of hydrogel production, followed by the exchanging of aqueous phase by IL plasticizer. Contrary to well-known hydrogel electrolytes, the biopolymer-based gels with IL could safely operate to high voltages, up to 3.0 V according to our experiments. The wide electrochemical stability allowed to extend the maximum energy density of gel electrolyte-based supercapacitors. Moreover, the investigated systems displayed a high performance in terms of specific capacitance, energy-power densities, and cyclability. There are compared to the reference cell with liquid electrolyte in terms of electrochemical characteristic, showing the specific capacitance values up to 140–145 F g−1, with excellent capacitance retention (ca. 90 %) after 10,000 galvanostatic charge and discharge cycles. Taking into account all the above-mentioned features, the prepared gel biopolymer electrolytes appear to be promising eco-friendly materials for high-performance supercapacitors.
22.04.2022
107282-1 - 107282-7
Article number: 107282
CC BY (uznanie autorstwa)
otwarte czasopismo
ostateczna wersja opublikowana
22.04.2022
w momencie opublikowania
publiczny
100
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