Hybrid Aqueous Energy Storage Cells Using Activated Carbon and Lithium-Ion Intercalated Compounds: IV. Possibility of Using Polymer Gel Electrolyte

Abstract

The polymer gel electrolyte using polyacrylamide and aqueous solution was prepared to study the applicability of polymer gel electrolyte to the activated carbon (AC)/lithium intercalated compound hybrid supercapacitors. The polymer gel electrolyte was found to have high conductivity, which even exceeded that of the aqueous solution counterpart, and wide stable potential window. A supercapacitor consisting of positive and AC negative electrodes using the polymer gel electrolyte was assembled and its charge-discharge profile at various temperatures was investigated and compared to that of a similar hybrid supercapacitor based on aqueous solution electrolyte. Moreover, the effects of polymer gel electrolyte on the capacitance profile, rate capability, self-discharge rate, leakage current, and cycle ability of the hybrid supercapacitor were intensively investigated.