A polymer electrolyte based on poly(vinylidene fluoride-hexafluoropylene)/hydroxypropyl methyl cellulose blending for lithium-ion battery

A polymer electrolyte based on the blending of poly(vinylidene fluoride-hexafluoropylene) (PVDF-HFP) and hydroxypropyl methyl cellulose (HPMC) was prepared for the first time. The structure and performance of the gel polymer electrolyte were characterized and measured by X-ray diffraction, Fourier transform infrared, thermogravimetric analysis, scanning electron microscopy, electrochemical impedance spectroscopy, linear sweep voltammetry, and by a charge/discharge test. The results show that the gel polymer electrolyte has the best performance when PVDF-HFP/HPMC ratio ( w / w ) is 4:1. At room temperature, the ionic conductivity can reach 0.38 × 10 −3 S cm −1 , the electrochemical stable window is up to 5.0 V (vs. Li/Li + ), and the half cell of Li/GPE/LiMn 2 O 4 shows high-discharge-specific capacity and good cycling performance.