# US 11,908,993 B2 · Method for manufacturing solid electrolyte membrane for all solid type battery and solid electrolyte membrane manufactured by the method > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,908,993 B2 - Document ID: US11908993B2 - Status: Granted - Kind: B2 - Application number: 17/724,933 - Filed: 2022-04-20 - Published: 2022-08-11 - Granted: 2024-02-20 - Earliest claimed: 2017-05-15 - Assignees: LG Energy Solution, Ltd. - Applicants: LG Energy Solution, Ltd. - Inventors: Sung-Ju Cho; Ho-Suk Shin; Seung-He Woo; Sung-Joong Kang; Hyea-Eun Han - Web page: https://patentgrep.com/patent/US11908993B2 ## CPC - H01M 10/056: characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes - H01M 10/0562: Solid materials - H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries - H01M 50/403: Manufacturing processes of separators, membranes or diaphragms - H01M 50/42: Acrylic resins - H01M 50/431: Inorganic material - H01M 50/44: Fibrous material - H01M 50/443: Particulate material - H01M 50/489: Separators, membranes, diaphragms or spacing elements inside the cells, characterised by their physical properties, e.g. swelling degree, hydrophilicity or shut down properties - H01M 50/491: Porosity - Y02E 60/10: Energy storage using batteries - H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY - Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION ## Abstract A solid electrolyte membrane and method of preparing, including a plurality of polymer filaments arranged crossed as a 3-dimensional structure in the form of a net of nonwoven fabric-like shape, and a plurality of inorganic solid electrolytes inserted and uniformly distributed in the structure. By this structural feature, a large amount of solid electrolyte particles are uniformly distributed and filled in the electrolyte membrane, contact between the particles is good, and ionic conduction paths are sufficiently provided. Additionally, the durability of the solid electrolyte membrane is improved by the 3-dimensional structure, and the flexibility and strength increase. The nonwoven fabric composite solid electrolyte membrane has an effect in preventing inorganic solid electrolyte particle from being disconnected therefrom. ## Claims ### Claim 1 A battery comprising an anode, a cathode and a solid electrolyte membrane interposed between the anode and the cathode, the solid electrolyte membrane comprising: a plurality of inorganic solid electrolyte particles; and a plurality of polymer filaments, wherein the plurality of polymer filaments are entangled and arranged crossed and linked to form a 3-dimensional mesh structure, the mesh structure is filled with the plurality of inorganic solid electrolyte particles along a thicknesswise direction, a content of the plurality of inorganic solid electrolyte particles in the solid electrolyte membrane ranges from 40 wt % to 90 wt % based on a total weight of the solid electrolyte membrane, and the solid electrolyte membrane has a porosity of 10 vol % or less. ### Claim 2 (depends on 1) The battery according to claim 1, wherein the plurality of polymer filaments comprise a polymer material selected from the group consisting of polyolefin, polyester, polyamide, polyacetal, polycarbonate, polyimide, polyetherketone, polyethersulfone, polyphenyleneoxide, polyphenylenesulfide, polyvinyledene fluoride, polyvinyl chloride, polyacrylonitrile, cellulose, polyparaphenylenebenzobisoxazole, and mixtures thereof. ### Claim 3 (depends on 1) The battery according to claim 1, wherein the plurality of inorganic solid electrolyte particles comprise a particle type comprising at least one of primary particles and secondary particles, said secondary particles comprising an agglomeration of primary particles. ### Claim 4 (depends on 1) The battery according to claim 1, wherein the plurality of polymer filaments have a diameter of 100 nm to 2 μm. ### Claim 5 (depends on 1) The battery according to claim 1, wherein the plurality of inorganic solid electrolyte particles comprise at least one of an oxide-based solid electrolyte and a sulfide-based solid electrolyte. ### Claim 6 (depends on 1) The battery according to claim 1, wherein the plurality of inorganic solid electrolyte particles and the plurality of polymer filaments are included in the solid electrolyte membrane at a weight ratio of 99:1 to 30:70. ### Claim 7 (depends on 1) The battery according to claim 1, wherein the solid electrolyte membrane has a porosity of 8 vol % or less. ### Claim 8 (depends on 1) The battery according to claim 1, wherein the solid electrolyte membrane has a porosity of 3 vol % or less. ### Claim 9 (depends on 1) The battery according to claim 1, wherein the solid electrolyte membrane has a porosity close to 0 vol %. ### Claim 10 (depends on 1) The battery according to claim 1, wherein the solid electrolyte membrane has an air permeability of 3,000 sec/100 cc or above. ### Claim 11 (depends on 1) A method for manufacturing the battery according to claim 1, comprising a method for manufacturing a solid electrolyte membrane, the method comprising: preparing a nonwoven fabric precursor in which a plurality of polymer filaments are gathered; preparing a solid electrolyte membrane-forming slurry; obtaining a mixture in which the nonwoven fabric precursor and the solid electrolyte membrane-forming slurry are mixed; drying the mixture to obtain a preliminary solid electrolyte membrane; and pressing the preliminary solid electrolyte membrane to obtain the solid electrolyte membrane, wherein the solid electrolyte membrane has a porosity of 10 vol % or less. ### Claim 12 (depends on 11) The method for manufacturing the battery according to claim 11, wherein the plurality of polymer filaments are obtained by spinning by an electrospinning method. ### Claim 13 (depends on 11) The method for manufacturing the battery according to claim 11, wherein the solid electrolyte membrane has a porosity of 8 vol % or less. ### Claim 14 (depends on 11) The method for manufacturing the battery according to claim 11, wherein the solid electrolyte membrane has a porosity of 3 vol % or less. ### Claim 15 (depends on 11) The method for manufacturing the according to claim 11, wherein the solid electrolyte membrane has an air permeability of 3,000 sec/100 cc or above.