Incorporating LLTO ceramic into PVDF/PEO polymer electrolyte for lithium-ion capacitor

Abstract

Hybrid supercapacitors are a prominent energy storage option for electric vehicles because they have high power and energy densities. Electrolyte plays a major role in hybrid supercapacitor performance. Our report is on a ceramic composite polymer electrolyte made from poly (vinylidene fluoride) (PVDF)/poly (ethylene oxide) (PEO)/ Lithium Lanthanum titanate (LLTO), which we analyzed for its structure, thermal behavior, and electrical characteristics. The different weight percentages (10 wt%, 20 wt%, 30 wt% and 40 wt%) of LLTO were incorporated into the PVDF/PEO polymer blends to study the performance of the electrolyte by FTIR, microscopic analysis, TGA, and impedance spectroscopy. Based on the results, 40 wt% of LLTO containing CPE showed high liquid electrolyte uptake behaviour (275 %) and a high ionic conductivity value (3.94 mS/cm). In addition, incorporating LLTO affects the PVDF/PEO polymer backbone and enhances the amorphicity of polymer blends. This result enhances the polymer segmental motion and reduces the relaxation time. We fabricated hybrid supercapacitor coin cells using 10 wt% and 40 wt% of LLTO containing composite polymer electrolyte and tested them. The 40 wt% LLTO-containing CPE-based hybrid supercapacitor possesses a high specific capacitance value (182F/g) and a long cycle life (upto10000 cycles).