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Streszczenie:
This study explores the development of porous poly(vinylidene luoride-co-hexafluoropropylene) based gel polymer electrolytes (GPEs) via a general polyethylene glycol extraction method, fol-lowed by the incorporation of perchlorate salts (LiClO4, Mg(ClO4)2, NaClO4). The influence of cation valency and ionic radius on ionic transport was systematically investigated for high-voltage supercapacitors (SCs). Among the prepared electrolytes, the LiClO4 based GPE exhibits the high-est ionic conductivity of 7.4 × 10−3 S cm−1 at room temperature along with a stable electrochemi-cal window of 2.6 V and superior performance in symmetric SCs. Symmetric SCs assembled with activated carbon achieved a specific capacitance of 76.7 F g−1 and retained excellent cycling sta-bility of 96.9% after 10 000 consecutive charge-discharge cycles measured at a current density of 1 A g−1. This work highlights the enhanced performance of ion transport attributed to a well-interconnected porous structure at the electrode−electrolyte interface and provides insights into the role of chemistry in high-performance SCs.

Słowa kluczowe:
activated carbon, gel polymer electrolyte, ionic conductivity, supercapacitor, temperature dependence