Investigation of (guar gum-ammonium bromide-propylene carbonate) solid polymer electrolyte for energy storage application

One of the foremost challenges currently faced by society pertains to the accessibility of renewable power generation in order to sustain the growth and productivity of civilization. Solid-state batteries offer a multitude of advantages in many energy storage applications. The objective of this work is to examine the synthesis and analysis of solid biopolymer electrolytes in primary proton batteries. A polymer electrolyte composed of guar gum as the polymer host, ammonium bromide as the salt dopant, and propylene carbonate as the plasticizer was synthesized utilizing the solution casting process. The maximum ionic conductivity of 1.38 × 10⁻⁴ Scm⁻¹ is obtained for the sample with 25 wt% of propylene carbonate. Investigation of temperature-dependent conductivity indicates the developed electrolyte obeys Arrhenius behaviour. XRD has been employed to investigate the amorphous characteristics of the prepared electrolyte. The study of the complexation between the polymer and the salt is conducted using the Fourier transform infrared (FTIR) technique. Transference number measurement indicates that the majority contribution of conductivity is through ions. The highest conducting membrane is electrochemically stable up to 1.48 V.