# US 2022/0045358 A1 · Sulfide solid electrolyte and method for the preparation thereof, all-solid-state lithium secondary battery, and apparatus containing the same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2022/0045358 A1 - Document ID: US20220045358A1 - Status: Published application - Kind: A1 - Application number: 17/509,097 - Filed: 2021-10-25 - Published: 2022-02-10 - Earliest claimed: 2019-04-25 - Assignees: Contemporary Amperex Technology Co., Limited - Applicants: Contemporary Amperex Technology Co., Limited - Inventors: Chengdu LIANG; Jiawei FU; Chengyong LIU; Yongsheng GUO; Bobing HU - Web page: https://patentgrep.com/patent/US20220045358A1 ## CPC - H01M 10/0562: Solid materials - C01B 17/22: Alkali metal sulfides or polysulfides - C01B 25/14: Sulfur, selenium, or tellurium compounds of phosphorus - 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 - C01P 2002/82: by IR- or Raman-data - C01P 2004/61: Micrometer sized, i.e. from 1-100 micrometer - C01P 2006/40: Electric properties - H01M 2300/0068: inorganic - Y02E 60/10: Energy storage using batteries - H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY - C01B: NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; {METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C} - C01P: INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS - Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION ## Abstract The present application discloses a sulfide solid electrolyte and a method for the preparation thereof, an all solid state lithium secondary battery, and an apparatus containing the all solid state lithium secondary battery. The sulfide solid electrolyte is obtained by compounding at least Li2S, P2S5 and a dopant MxS2O3, wherein M is one or more selected from Na, K, Ba and Ca, and 1≤x≤2. ## Claims ### Claim 1 A sulfide solid electrolyte obtained by compounding at least Li2S, P2S5 and a dopant MxS2O3, wherein M is one or more selected from Na, K, Ba and Ca, and 1≤x≤2. ### Claim 2 (depends on 1) The sulfide solid electrolyte according to claim 1, wherein in the sulfide solid electrolyte, a mole percentage of Li2S is greater than or equal to 60% and is less than or equal to 79%, a mole percentage of P2S5 is greater than or equal to 16% and is less than or equal to 30%, and a molar percentage of MxS2O3 is greater than 0% and is less than or equal to 10%. ### Claim 3 (depends on 1) The sulfide solid electrolyte according to claim 1, wherein in the sulfide solid electrolyte, the mole percentage of Li2S is greater than or equal to 70% and is less than or equal to 79%, the mole percentage of P2S5 is greater than or equal to 20% and is less than or equal to 29%, and the molar percentage of MxS2O3 is less than or equal to 5%, and is preferably greater than or equal to 1% and less than or equal to 5%. ### Claim 4 (depends on 1) The sulfide solid electrolyte according to claim 1, wherein the M comprises one or more of Na and K, and preferably M comprises Na. ### Claim 5 (depends on 1) The sulfide solid electrolyte according to claim 1, wherein the sulfide solid electrolyte is a multiphase composite containing a glass phase and a crystal phase, comprising PS43, P2S74− and P2S64−, and the ratio of Raman characteristic peak intensities of the PS43, P2S74− and P2S64− is 1-60: 1-60:0.01-1, and is preferably 20-40: 10-20:0.01-0.1. ### Claim 6 (depends on 1) The sulfide solid electrolyte according to claim 1, wherein the sulfide solid electrolyte has an average particle size of 5 μm to 50 μm, and preferably 10 μm to 20 μm. ### Claim 7 (depends on 1) The sulfide solid electrolyte according to claim 1, wherein the sulfide solid electrolyte has an ionic conductivity of 0.6 mS/cm to 2.5 mS/cm. ### Claim 8 (depends on 1) The sulfide solid electrolyte according to claim 1, wherein in a cyclic voltammetry curve of the sulfide solid electrolyte, the peak current ratio of an anode peak to a cathode peak is from 0.55 to 0.85. ### Claim 9 (depends on 1) An all-solid-state lithium secondary battery, comprising a positive electrode plate, a negative electrode plate and a solid electrolyte membrane, wherein the solid electrolyte membrane comprises the sulfide solid electrolyte according to a claim 1. ### Claim 10 (depends on 9) The all-solid-state lithium secondary battery according to claim 9, wherein the sulfide solid electrolyte in the solid electrolyte membrane has an average particle size of 5 μm to 50 μm, and preferably 10 μm to 20 μm. ### Claim 11 (depends on 1, 9) The all-solid-state lithium secondary battery according to claim 9, wherein the positive electrode plate and/or the negative electrode plate comprises the sulfide solid electrolyte according to claim 1. ### Claim 12 (depends on 11) The all-solid-state lithium secondary battery according to claim 11, wherein the sulfide solid electrolyte in the positive electrode plate and/or the negative electrode plate has an average particle size of 5 μm to 50 μm, and preferably 10 μm to 20 μm. ### Claim 13 (depends on 9) An apparatus, comprising the all-solid-state lithium secondary battery according to claim 9. ### Claim 14 A method for the preparation of a sulfide solid electrolyte, comprising: performing a ball milling treatment on Li2S, P2S5 and the dopant MxS2O3 in the presence of an organic solvent to obtain an incipient wet material; removing the organic solvent from the incipient wet material to obtain a mixed material; and performing a heat treatment on the mixed material at a temperature of 150° C. to 450° C. for 0.5 h to 20 h to obtain the sulfide solid electrolyte. ### Claim 15 (depends on 14) The method according to claim 14, wherein the heat treatment temperature is from 200° C. to 400° C., and preferably from 230° C. to 300° C.; and/or, the heat treatment time is from 1 h to 10 h, and preferably from 2 h to 5 h.