▎ 摘　　要

NOVELTY - Preparation of solid polymer electrolyte involves mixing graphene dispersion liquid obtained by dispersing graphene oxide in solvent (a), and polyethylene glycol monomethyl ether, processing, adding catalyst, stirring, heating, stirring, refluxing, filtering, repeatedly washing obtained filter product using ethanol, vacuum-drying to obtain functional graphene, mixing functional graphene and organic solvent (b), uniformly dispersing, adding polymer matrix and lithium salt, processing, transferring obtained viscous sol-gel into polyfluortetraethylene mold, processing, and drying. USE - Preparation of solid polymer electrolyte (claimed). ADVANTAGE - The method provides solid nanocomposite polymer electrolyte membrane having high room-temperature conductivity, and smooth and even surface. The solid nanocomposite polymer electrolyte has high lithium ion transference number and electrochemical stability. DETAILED DESCRIPTION - Preparation of solid polymer electrolyte involves preparing graphene oxide dispersion liquid by dissolving graphene oxide prepared by improved Hummers method in solvent (a), and ultrasonically processing for 5-30 minutes at 10-40 kHz, mixing obtained graphene dispersion liquid and polyethylene glycol monomethyl ether, ultrasonically processing for 0.1-8 hours at 10-40 kHz, adding catalyst, stirring at 25-50 degrees C for 1-3 hours, heating at 50-120 degrees C, stirring, refluxing for 1-72 hours, washing using deionized water, filtering using ultra microporous film, repeatedly washing obtained filter product using ethanol, vacuum-drying at 25-100 degrees C for 1-60 hours to obtain functional graphene, mixing functional graphene and organic solvent (b), processing under ultrasonic waves or stirring for 10 minutes to 24 hours at 10-40 kHz, uniformly dispersing functional graphene in organic solvent (b), adding polymer matrix dried at 50-80 degrees C for 1-24 hours and lithium salt dried at 100-150 degrees C for 1-24 hours, processing under ultrasonic waves or stirring for 1-24 hours at 10-40 kHz to obtain transparent viscous sol-gel, transferring obtained transparent viscous sol-gel into polyfluortetraethylene mold, processing under protection of nitrogen, transferring obtained product into vacuum glove box, and drying at 40-60 degrees C for 12-48 hours under vacuum, to obtain solid nanocomposite polymer electrolyte membrane having thickness of 10-200 microns. The graphene oxide has more than 80% single sheets. The mass ratio of polyethylene glycol monomethyl ether and graphene oxide dispersion liquid is 1:1-50:1. The mass ratio of functional graphene and polymer matrix is 0.1:100-5:100. The mass ratio of lithium salt and polymer matrix is 1:1-5:10.