THIN FILM OF NON-PROTONIC ELECTROLYTE, ELECTROLYTE-IMMOBILIZED LIQUID-FILM CONDUCTOR AND POLYMER BATTERY

摘要

A thin aprotic electrolyte film comprising an aprotic electrolyte solution and a microporous polyolefin film which has an affinity for the solution and which holds the solution infiltrated thereinto. It can be produced, e.g., by a method comprising modifying a microporous polyolefin film by grafting a monomer soluble in an aprotic electrolyte solution onto the polyolefin, or coating the film with a terminal-modified polypropylene soluble in the solution, or coating the film with a wax soluble in the solution. An aprotic electrolyte solution is infiltrated into a film obtained by imparting an affinity for the solution to a microporous polyolefin film containing an electron-conducting material to obtain an immobilized liquid film conductor. When the thin aprotic electrolyte film based on the microporous polyolefin film is used in combination with positive and negative electrodes, a polymer cell such as a lithium battery is obtained. When the film conductor based on the microporous polyolefin film containing an electron-conducting material is used as at least one of positive and negative electrodes in combination with the thin aprotic electrolyte film, a polymer cell can be obtained which has satisfactory high-rate discharge performance at a lower temperature than conventional lithium batteries, is reduced in self-discharge even at high temperatures, and well retains its performance after charging over long-term standing.