A Protic Ionic Liquid Promoted Gel Polymer Electrolyte for Solid-State Electrochemical Energy Storage

Jiaxing Liu; Zan Wang; Zhihao Yang; Meiling Liu; Hongtao Liu

doi:10.3390/ma17235948

A Protic Ionic Liquid Promoted Gel Polymer Electrolyte for Solid-State Electrochemical Energy Storage

Materials (Basel). 2024 Dec 5;17(23):5948. doi: 10.3390/ma17235948.

Authors

Jiaxing Liu¹, Zan Wang¹, Zhihao Yang¹, Meiling Liu¹, Hongtao Liu¹

Affiliation

¹ Hunan Provincial Key Laboratory of Chemical Power Sources, College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China.

Abstract

This study presents the synthesis of a transparent, flexible gel polymer electrolyte (GPE) based on the protic ionic liquid BMImHSO₄ and on polyvinyl alcohol (PVA) through solution casting and electrochemical evaluation in a 2.5 V symmetrical C/C electrical double-layer solid-state capacitor (EDLC). The freestanding GPE film exhibits high thermal stability (>300 °C), wide electrochemical windows (>2.7 V), and good ionic conductivity (2.43 × 10^-2 S cm^-1 at 20 °C). EDLC, using this novel GPE film, shows high specific capacitance (81 F g^-1) as well as good retention above 90% of the initial capacitance after 4500 cycles. The engineered protic ionic liquid GPE is, hopefully, applicable to high-performance solid-state electrochemical energy storage.

Keywords: electrochemical energy storage; gel polymer electrolyte; protic ionic liquid; solid-state capacitor.

Abstract

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