Investigation on the properties of PVDF matrix composite porous gel polymer electrolyte doped with lithium silicon gel

School of Mechanical and Electrical Engineering, Guangdong University of Science and Technology, Dongguan, Guangdong, China

^* Corresponding author’s email: 53340450@qq.com

Abstract

Gel polymer electrolytes are safer because they do not contain liquid phase components. On this basis, the introduction of inorganic fillers effectively overcame the problem of low ionic conductivity of polymer electrolyte at room temperature, and the constructed composite polymer electrolyte (CPEs) combined the advantages of inorganic fillers and polymer segments. In this paper, lithium silicon gel SiO₂(Li⁺) was prepared by in-situ polymerization and sol-gel method, and doped in PVDF composite porous gel polymer electrolyte film prepared by immersion precipitation method. The electrochemical properties and surface topography of lithium iron phosphate were investigated by mounting a bonded lithium iron phosphate quasisolid lithium-ion battery. The experimental results show that the solid electrolyte film modified by SiO₂(Li⁺) has good electrochemical and a certain reference value.