# US 2019/0319239 A1 · Separator and electrochemical device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0319239 A1 - Document ID: US20190319239A1 - Status: Published application - Kind: A1 - Application number: 16/015,169 - Filed: 2018-06-21 - Published: 2019-10-17 - Earliest claimed: 2018-04-11 - Assignees: Ningde Amperex Technology Limited - Applicants: Ningde Amperex Technology Limited - Inventors: Xinhui Zhou - Web page: https://patentgrep.com/patent/US20190319239A1 ## CPC - C01B 32/21: After-treatment - H01M 50/446: Composite material consisting of a mixture of organic and inorganic materials - C01B 32/184: Preparation - H01M 4/13: Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof - H01M 4/139: Processes of manufacture - H01M 4/505: of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy - H01M 4/525: of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy - H01M 4/583: Carbonaceous material, e.g. graphite-intercalation compounds or CFx - H01M 4/623: {fluorinated polymers} - 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 10/0569: characterised by the solvents - H01M 10/058: Construction or manufacture - H01M 10/0587: of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators - H01M 10/4235: {Safety or regulating additives or arrangements in electrodes, separators or electrolyte (H01M10/4242 takes precedence)} - H01M 50/403: Manufacturing processes of separators, membranes or diaphragms - H01M 50/443: Particulate material - H01M 50/46: Separators, membranes or diaphragms characterised by their combination with electrodes - 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 - Y02P 70/50: Manufacturing or production processes characterised by the final manufactured product - C01B: NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; {METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C} - 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 - Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS ## Abstract The application provides a separator and an electrochemical device. The separator includes: a porous substrate; a first coating layer including a material that reversibly intercalation and deintercalation of lithium; and a second coating layer including one or both of inorganic particles and a polymer, wherein the first coating layer is arranged between the porous substrate and the second coating layer. According to the application, the first coating layer is arranged on one or both surfaces of the porous substrate, and therefore the safety performance, rate performance, and cycle performance of the electrochemical device are improved. ## Claims ### Claim 1 A separator, comprising: a porous substrate; a first coating layer, comprising a material that reversibly intercalation and deintercalation of lithium; and a second coating layer, comprising at least one of inorganic particles and a polymer, wherein the first coating layer is arranged between the porous substrate and the second coating layer. ### Claim 2 (depends on 1) The separator according to claim 1, wherein the first coating layer is in contact with the porous substrate. ### Claim 3 (depends on 1) The separator according to claim 1, wherein the material that reversibly intercalation and deintercalation of lithium comprises at least one of artificial graphite, natural graphite, mesocarbon microbeads, soft carbon, hard carbon, silicon, tin, silicon oxides, silicon-carbon composites, titanium-niobium oxide, and lithium titanate. ### Claim 4 (depends on 1) The separator according to claim 1, wherein, the porous substrate has a thickness of 0.5 μm to 50 μm; the first coating layer has a thickness of 0.05 μm to 10 μm; and the second coating layer has a thickness of 0.5 μm to 20 μm. ### Claim 5 (depends on 1) The separator according to claim 1, wherein the first coating layer further comprises a first binder. ### Claim 6 (depends on 1) The separator according to claim 1, wherein the second coating layer further comprises a second binder, the inorganic particles are connected to each other and fixed by the second binder, and a pore structure is formed by space among the inorganic particles. ### Claim 7 (depends on 1) The separator according to claim 1, wherein the inorganic particles comprise at least one of: inorganic particles with a dielectric constant of 5 or more, inorganic particles with piezoelectricity, and inorganic particles with lithium ion conductivity. ### Claim 8 (depends on 7) The separator according to claim 7, wherein the inorganic particles with a dielectric constant of 5 or more comprise at least one of SrTiO3, SnO2, CeO2, MgO, NiO, CaO, ZnO, ZrO2, Y2O3, Al2O3, TiO2, and SiC. ### Claim 9 (depends on 7) The separator according to claim 7, wherein the inorganic particles with piezoelectricity comprises at least one of BaTiO3, Pb(Zr,Ti)O3(PZT), Pb1-xLaxZr1-yTiyO3(PLZT), Pb(Mg1/3Nb2/3)O3—PbTiO3 (PMN-PT) and hafnium dioxide (HfO2). ### Claim 10 (depends on 7) The separator according to claim 7, wherein the inorganic particles with lithium ion conductivity comprises at least one of: lithium phosphate Li3PO4; lithium titanium phosphate LixTiy(PO4)3, wherein 0