# US 5,348,824 A · Process of coating by melt extrusion a solid polymer electrolyte on positive electrode of lithium battery > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 5,348,824 A - Document ID: US5348824A - Status: Granted - Kind: A - Application number: 08/140,536 - Filed: 1993-10-25 - Granted: 1994-09-20 - Earliest claimed: 1993-10-25 - Assignees: Hydro-Quebec - Inventors: Michel Duval - Web page: https://patentgrep.com/patent/US5348824A ## CPC - H01M 10/0565: Polymeric materials, e.g. gel-type or solid-type - H01M 10/052: Li-accumulators - B29C 48/001: {Combinations of extrusion moulding with other shaping operations} - B29C 48/0018: {combined with shaping by orienting, stretching or shrinking, e.g. film blowing (B29C48/0017 takes precedence)} - B29C 48/08: flexible, e.g. films - B29K 2995/0005: Conductive - B29L 2007/008: {Wide strips, e.g. films, webs} - B29L 2031/3468: {Batteries, accumulators or fuel cells (battery cases B29L2031/7146)} - H01M 6/188: {Processes of manufacture} - Y02E 60/10: Energy storage using batteries - Y10T 29/49115: including coating or impregnating - H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY - B29C: SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING (making preforms B29B11/00; making laminated products by combining previously unconnected layers which become one product whose layers will remain together B32B37/00 - B32B41/00) - B29K: INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR {MOULDS, } REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS - B29L: INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES - Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract Polymer based amorphous compositions are melt extruded in the form of thin films, directly on the positive electrode of an all solid lithium battery. This procedure has many advantages as compared to the procedure using a solvent (rapidity, cost, quality of the interface, no problems with recycling and environment). ## Claims ### Claim 1 Process for coating a solid polymer electrolyte on a positive electrode of an all solid lithium battery, which comprises introducing an at least partially amorphous homopolymer, copolymer or terpolymer base composition into an extruder, extruding said composition in the form of thin film and directly depositing said thin film, at the outlet of the extruder, on a previously prepared positive electrode film. ### Claim 2 (depends on 1) Process according to claim 1, which comprises circulating the positive electrode film under the die of the extruder when depositing said thin electrolyte film. ### Claim 3 (depends on 1) Process according to claim 1, wherein the thin film has a thickness between about 10 .mu. and about 100 .mu.. ### Claim 4 (depends on 3) Process according to claim 3, wherein the thin film has a thickness of about 30 .mu.. ### Claim 5 (depends on 1) Process according to claim 1, which comprises allowing the film of positive electrode to circulate at a speed between about 5 m/min and about 50 m/min. ### Claim 6 (depends on 5) Process according to claim 5, wherein the film of positive electrode circulates at a speed of about 10 m/min. ### Claim 7 (depends on 1) Process according to claim 1, which comprises heating the extruder at a temperature between about 50.degree. C. and about 230.degree. C. ### Claim 8 (depends on 7) Process according to claim 7, wherein the temperature of the extruder is at about 140.degree. C. for mixtures of crystalline polymer and salt and about 100.degree. C. for mixtures of amorphous polymer and salt. ### Claim 9 (depends on 1) Process according to claim 1, which comprises extruding said composition through a die capable of producing a film in which the thickness is between about 10 .mu. and about 100 .mu.. ### Claim 10 (depends on 9) Process according to claim 9, wherein said die produces a film in which the thickness is about 30 .mu.m. ### Claim 11 (depends on 1) Process according to claim 1, wherein the positive electrode has previously been prepared, for example by solvent coating. ### Claim 12 (depends on 1) Process according to claim 1, wherein the extruded composition includes a copolymer of ethylene oxide and an amorphous cyclic ether oxide, with or without an appropriate lithium salt. ### Claim 13 (depends on 1) Process according to claim 1, wherein the extruded composition includes at least one crystalline polymer to which there is added a salt or an electrochemically appropriate solid additive capable of making it partially amorphous. ### Claim 14 (depends on 13) Process according to claim 13, wherein an electrochemically suitable lithium salt which presents no handling danger is added to the crystalline polymer. ### Claim 15 (depends on 1) Process according to claim 1, wherein the extruded composition consists of homopolymers or copolymers derived from at least one monomer comprising at least one heteroatom capable of giving donor/receptor bonds with the cation of an appropriate lithium salt. ### Claim 16 (depends on 15) Process according to claim 15, wherein the lithium salt is selected from lithium terfluorosulfonimide (TFSI) or lithium bis perhalogenoacyl or -sulfonylimide (TFSM). ### Claim 17 (depends on 5) Process according to claim 5, which comprises circulating the film of positive electrode at a speed slightly higher than the speed of the film which exits from the extruder to provide, by stretching, a thin polymer film of required thickness on the film of positive electrode. ### Claim 18 (depends on 17) Process according to claim 17, wherein the thin film exits from the extruder at a speed between about 5 m/min and about 50 m/min. ### Claim 19 (depends on 18) Process according to claim 18, characterized in that said speed is about 10 m/min. ### Claim 20 (depends on 18) Process according to claim 18, wherein the film exits from the extruder at a speed slightly lower than 10 m/min, while the film of positive electrode circulates at a speed at least equal to 10 m/min.