Superior charge discharge ability of reduced graphene oxide/Li-ion embedded polymer composite films

Electroactive polymeric composites are recent generation material for energy application in lithium batteries, solar cells and supercapacitors. In present study, reduced graphene oxide is prepared from graphite powder using liquid exfoliation. The synthesized reduced graphene oxide is embedded with polystyrene sulfonic acid/lithium phosphate polymer electrolyte to obtain polymer composite films. The dielectric studies of composite reveals huge change in relaxation time with addition of rGO in polymeric lithium ion composites. This attributes to decrease in ion-dipolar interaction strength and enhanced polymer segmental motion in presence of carbon. It also implies the activation of electrochemical properties of polystyrene sulfonic acid/lithium phosphate/reduced graphene oxide (PL–rGO) composites which can be effectively utilize for charge storage applications. The PL–rGO composite exhibits an improved electrochemical performance with different scan rate on potential window ranged between − 0.5 and 1.2 V. The specific capacitance value of ~ 17 F/g with high rate charge–discharge capability over 8000 cycles was observed. Higher electrochemical stability and steady charge/discharge behavior makes PL–rGO composites a promising candidate for charge storage applications.