# US 11,444,272 B2 · Positive electrode including room temperature solid state plasticizer, and solid electrolyte battery including the same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,444,272 B2 - Document ID: US11444272B2 - Status: Granted - Kind: B2 - Application number: 16/648,116 - Filed: 2019-04-10 - Published: 2020-08-06 - Granted: 2022-09-13 - Earliest claimed: 2018-04-26 - Assignees: LG Energy Solution, Ltd. - Applicants: LG Chem, Ltd. - Inventors: Ji-Hoon Ryu; Jung-Pil Lee; Sung-Joong Kang; Eun-Bee Kim; Hyo-Sik Kim; Suk-Woo Lee; Jae-Hyun Lee - Web page: https://patentgrep.com/patent/US11444272B2 ## CPC - H01M 4/13: Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof - H01M 10/62: specially adapted for specific applications - H01M 4/62: Selection of inactive substances as ingredients for active masses, e.g. binders, fillers - H01M 10/052: Li-accumulators - H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries - H01M 10/0562: Solid materials - H01M 10/0565: Polymeric materials, e.g. gel-type or solid-type - H01M 10/0585: of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators - H01M 4/0404: {by coating on electrode collectors} - H01M 10/4235: {Safety or regulating additives or arrangements in electrodes, separators or electrolyte (H01M10/4242 takes precedence)} - H01M 2004/028: {Positive electrodes} - 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 The present disclosure relates to a positive electrode for a solid electrolyte battery which includes: a positive electrode current collector; a first positive electrode active material layer formed on at least one surface of the positive electrode current collector and including a first positive electrode active material, a first solid electrolyte and a first electrolyte salt; and a second positive electrode active material layer formed on the first positive electrode active material layer and including a second positive electrode active material, a second solid electrolyte, a second electrolyte salt and a plasticizer, wherein the plasticizer has a melting point of 30-130° C. The present disclosure also relates to a solid electrolyte battery including the positive electrode. ## Claims ### Claim 1 A positive electrode for a solid electrolyte battery which comprises: a positive electrode current collector; a first positive electrode active material layer formed on at least one surface of the positive electrode current collector and comprising a first positive electrode active material, a first solid electrolyte and a first electrolyte salt, and the first positive electrode active material layer comprises no plasticizer; and a second positive electrode active material layer formed on the first positive electrode active material layer and comprising a second positive electrode active material, a second solid electrolyte, a second electrolyte salt and a plasticizer, and the plasticizer has a melting point of 30-130° C. ### Claim 2 (depends on 1) The positive electrode for a solid electrolyte battery according to claim 1, wherein the plasticizer has a melting point of 35-65° C. ### Claim 3 (depends on 1) The positive electrode for a solid electrolyte battery according to claim 1, wherein the plasticizer is used in an amount of 0.1-30 wt % based on the total weight of the second positive electrode active material layer. ### Claim 4 (depends on 1) The positive electrode for a solid electrolyte battery according to claim 1, wherein each of the first positive electrode active material layer and the second positive electrode active material layer further comprises a conductive material and a binder. ### Claim 5 (depends on 1) The positive electrode for a solid electrolyte battery according to claim 1, wherein the weight ratio of the first positive electrode active material layer to the second positive electrode active material layer is 1:99-99:1. ### Claim 6 (depends on 1) The positive electrode for a solid electrolyte battery according to claim 1, wherein the first solid electrolyte and the second solid electrolyte are each a polymer solid electrolyte, an organic electrolyte, or a polymer gel electrolyte. ### Claim 7 (depends on 1) The positive electrode for a solid electrolyte battery according to claim 1, wherein the plasticizer is ethylene carbonate (EC), polyethylene glycol (PEG) having a weight average molecular weight of 1,000 or more, succinonitrile (SN), cyclic phosphate (CP), or at least two of them. ### Claim 8 (depends on 1) A solid electrolyte battery comprising a positive electrode, a negative electrode and a separator interposed between the positive electrode and the negative electrode, wherein the positive electrode is the positive electrode for a solid electrolyte battery as defined in claim 1. ### Claim 9 (depends on 8) The solid electrolyte battery according to claim 8, wherein the separator comprises a solid electrolyte membrane, and the negative electrode comprises lithium metal. ### Claim 10 (depends on 8) The solid electrolyte battery according to claim 8, which is activated at a temperature between the melting point of the plasticizer and 130° C., and the plasticizer is present in a liquid state after the solid electrolyte battery is activated. ### Claim 11 (depends on 10) The solid electrolyte battery according to claim 10, wherein the plasticizer in the liquid state infiltrates into cracks formed in the second positive electrode active material. ### Claim 12 (depends on 10) The solid electrolyte battery according to claim 10, wherein voids in the second positive electrode active material layer are filled with the plasticizer in the liquid state. ### Claim 13 (depends on 8) A battery module comprising the solid electrolyte battery as defined in claim 8 as a unit cell. ### Claim 14 (depends on 13) A battery pack comprising the battery module as defined in claim 13.