▎ 摘　　要

NOVELTY - Preparing polymer solid electrolyte comprises (i) adding solvent in graphene oxide solution, carrying out ultrasonic treatment to graphene oxide aqueous solution; (ii) adding polymer matrix to solution under the condition of stirring and heating, stirring the solution after adding the polymer matrix; (iii) dissolving inorganic salt in solvent, and the inorganic salt solution after adding the solvent is subjected to ultrasonic treatment; (iv) adding solution into the solution and stirring under heating; and (v) placing the solution in a standing mold, placing the standing mold into a blast oven for blast drying to obtain a polymer solid electrolyte; where the solvent is deionized water or a mixed solution of deionized water and organic solvents. USE - The method is useful for preparing polymer solid electrolyte, which is useful in a battery e.g. lithium-ion battery, and lithium polymer battery. ADVANTAGE - The method reduces the harm of the solid electrolyte in the manufacturing process, using the graphene and water molecule interaction, fixing the residual moisture in the electrolyte membrane, avoiding the electrolytes membrane and electrode material generating side reaction, and improving the battery cycle performance. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for: a polymer solid electrolyte; and a battery. DESCRIPTION OF DRAWING(S) - The drawing shows a charge and discharge curve of the lithium iron phosphate battery assembled by the polymer solid electrolyte membrane obtained in Example 1. (Drawing includes non-English language text).