Studies on a novel Na+ superionic conducting polymer gel cocktail electrolyte membrane immobilizing molecular liquid mixture of carbonates, tetraglyme and ionic liquid

Novel Na+ superionic conducting polymer gel cocktail electrolyte membranes immobilizing molecular liquid mixture of carbonates, tetraglyme and ionic liquid have been prepared by solution cast method. The optimized free standing electrolyte membrane offers ionic conductivity of 3.3 x 10(-3) S cm(-1) and sodium-ion transport number of 0.31 at ambient temperature. The detailed ion-dynamics have been investigated with the help of frequency dependent dielectric and modulus studies. The possible interaction of these molecular liquids with sodium tetrafluoroborate salt and poly(vinylidiene fluoridehexafluoropropylene) polymer host is investigated by FTIR studies. The DSC study confirms that the electrolyte system maintains the gel phase up to similar to 120 degrees C. The linear sweep voltammetry reveal the working voltage range offered by the electrolyte system to be 3.46 V. The Electric double layer capacitor (EDLC) cell with optimized electrolyte membrane and electrodes of activated carbon demonstrate the specific discharge capacity of similar to 60F g(-1) and drops negligibly with cycle number. The reported Na+ superionic conducting cocktail electrolyte system can be utilized as an electrolyte while fabricating electrochemical devices especially the EDLCs. (C) 2021 Elsevier B.V. All rights reserved.

Automated summary

A novel Na+ superionic conducting polymer gel cocktail electrolyte membranes have been prepared, offering good ionic conductivity and sodium-ion transport properties at ambient temperature. The ion-dynamics and interactions with other components have been investigated, showing that the electrolyte system can maintain a gel phase at high temperatures according to DSC studies. Linear sweep voltammetry reveals a working voltage range of 3.46 V for this electrolyte system.