# US 2025/0096418 A1 · Separator and electrochemical device 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 2025/0096418 A1 - Document ID: US20250096418A1 - Status: Published application - Kind: A1 - Application number: 18/827,855 - Filed: 2024-09-09 - Published: 2025-03-20 - Earliest claimed: 2023-09-19 - Assignees: SK Innovation Co., Ltd.; SK ie technology Co., Ltd. - Applicants: SK Innovation Co., Ltd.; SK Ie Technology Co., Ltd. - Inventors: Won Sub KWACK; Sang Hoon KIM; Heung Taek BAE; Ji Sook LIM - Web page: https://patentgrep.com/patent/US20250096418A1 ## CPC - H01M 50/403: Manufacturing processes of separators, membranes or diaphragms - H01M 50/451: comprising layers of only organic material and layers containing inorganic material - H01M 50/414: Synthetic resins, e.g. thermoplastics or thermosetting resins - H01M 50/434: Ceramics - H01M 50/443: Particulate material - H01M 50/446: Composite material consisting of a mixture of organic and inorganic materials - 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 - H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries - H01M 50/417: Polyolefins - 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 Provided are a separator and an electrochemical device including the same. According to an embodiment of the present disclosure, a separator is provided which includes a porous substrate; and an inorganic particle layer which is placed on one or both surfaces of the porous substrate and includes inorganic particles and an inorganic binder, wherein the inorganic particle layer includes an organic compound having a lower content than the inorganic binder and the inorganic binder includes a metal silicate. ## Claims ### Claim 1 A separator comprising: a porous substrate; and an inorganic particle layer which is placed on one or both surfaces of the porous substrate and includes inorganic particles and an inorganic binder, wherein the inorganic particle layer further includes an organic compound having a lower content than the inorganic binder and the inorganic binder includes a metal silicate. ### Claim 2 (depends on 1) The separator of claim 1, wherein the metal silicate connects and fixes the inorganic particles together and the inorganic particle layer and the porous substrate together. ### Claim 3 (depends on 2) The separator of claim 2, wherein the organic compound includes a first organic compound of one or more selected from the group consisting of polycarboxylates, sulfonates, and polysiloxane-based compounds, a second organic compound of one or more selected from the group consisting of ester-based polymers, amide-based polymers, imide-based polymers, acryl-based polymers, styrene-based polymers, vinyl alcohol-based polymers, vinylpyrrolidone-based polymers, cellulose-based polymers, and fluorine-based polymers, or a combination thereof. ### Claim 4 (depends on 3) The separator of claim 3, wherein the organic compound includes less than 30 wt % of the second organic compound, based on the total weight of the organic compound. ### Claim 5 (depends on 4) The separator of claim 4, wherein the organic compound includes only the first organic compound and does not include any of the second organic compound. ### Claim 6 (depends on 1) The separator of claim 1, wherein the metal of the metal silicate is one or more or two or more metals selected from the group consisting of Group 1, Group 2, and Group 13 metals. ### Claim 7 (depends on 1) The separator of claim 1, wherein the metal of the metal silicate is one or more or two or more metals selected from the group consisting of Group 1 and Group 2 metals. ### Claim 8 (depends on 7) The separator of claim 7, wherein the metal silicate is represented by the following Chemical Formula 1: M2O·nSiO2 [Chemical Formula 1] wherein M is an alkali metal, and n is 4 to 10. ### Claim 9 (depends on 1) The separator of claim 1, wherein the inorganic particles include one or two or more selected from the group consisting of metal hydroxides, metal oxides, metal nitrides, metal carbides, and metal sulfates. ### Claim 10 (depends on 1) The separator of claim 1, wherein the inorganic particles have an average particle diameter (D50) of 1 μm or less. ### Claim 11 (depends on 1) The separator of claim 1, wherein a total thickness of the inorganic particle layer formed on the porous substrate is 5 μm or less. ### Claim 12 (depends on 1) The separator of claim 1, wherein a heat shrinkage rate in the width direction which is measured after allowing the separator to stand at 130° C. for 60 minutes is 3% or less. ### Claim 13 (depends on 1) The separator of claim 1, wherein a heat shrinkage rate in the width direction which is measured after allowing the separator to stand at 150° C. for 60 minutes is 7% or less. ### Claim 14 (depends on 1) The separator of claim 1, wherein the inorganic particle layer includes 0.1 to 20 parts by weight of the metal silicate with respect to 100 parts by weight of the inorganic particles. ### Claim 15 (depends on 1) The separator of claim 1, wherein the porous substrate includes a polar group on a surface. ### Claim 16 (depends on 1) An electrochemical device comprising the separator of claim 1. ### Claim 17 A separator comprising: a porous substrate having first and second large surfaces opposite to each other; and an inorganic particle layer securely adhered to at least one of the first and second large surfaces of the porous substrate, wherein the inorganic particle layer comprises inorganic particles, a metal silicate binder, and an organic compound, and wherein a content of the organic compound in the inorganic particle layer is less than a content of the metal silicate binder.