# US 12,009,545 B2 · Separator including ion conductive polymer filling pores of substrate and coating layer, manufacturing method of the same, lithium secondary 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 12,009,545 B2 - Document ID: US12009545B2 - Status: Granted - Kind: B2 - Application number: 17/263,543 - Filed: 2020-05-22 - Published: 2021-07-29 - Granted: 2024-06-11 - Earliest claimed: 2019-05-23 - Assignees: LG Energy Solution, Ltd. - Applicants: LG Chem, Ltd. - Inventors: Hyunwoong Yun; Hoejin Hah; Jong Keon Yoon - Web page: https://patentgrep.com/patent/US12009545B2 ## CPC - H01M 50/446: Composite material consisting of a mixture of organic and inorganic materials - H01M 4/134: Electrodes based on metals, Si or alloys - H01M 4/382: {Lithium (H01M4/405 takes precedence)} - H01M 4/661: {Metal or alloys, e.g. alloy coatings (H01M4/669 take precedence)} - 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 10/4235: {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 50/417: Polyolefins - H01M 50/426: Fluorocarbon polymers - H01M 50/431: Inorganic material - H01M 50/443: Particulate material - H01M 50/449: having a layered structure - H01M 50/451: comprising layers of only organic material and layers containing inorganic material - H01M 50/497: Ionic conductivity - 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 separator for lithium secondary battery, a method for manufacturing same, and a lithium secondary battery including the same. Specifically, in one embodiment of the present disclosure, by filling the pores of the separator, the present invention physically inhibits the metal column capable of growing on the surface of the negative electrode from moving toward the positive electrode, inhibits a micro-short circuit of the lithium secondary battery, and ultimately improves the lifetime of the lithium secondary battery. In addition, by controlling the type of filling the pores of the separator and the type of the polymer filling it, the output characteristics of the lithium secondary battery are secured and improved. ## Claims ### Claim 1 A separator for a lithium secondary battery comprising: a substrate having a plurality of first pores formed therein; a coating layer deposited on a surface of the substrate, including inorganic particles and a binder, and having a plurality of second pores formed therein; and an ion conductive polymer that fills the first pores, wherein the ion conductive polymer comprises a compound represented by Formula 1: in Formula 1, m is 0 or 1, 3≤n≤5, and 1.5≤x≤14. ### Claim 2 (depends on 1) The separator for a lithium secondary battery according to claim 1, wherein the ion conductive polymer is contained in the coating layer to fill the plurality of second pores, and a sum of volumes of the ion conductive polymer and the binder with respect to a total volume of the coating layer containing the ion conductive polymer is 50% by volume or more and 100% by volume or less. ### Claim 3 (depends on 1) The separator for a lithium secondary battery according to claim 1, wherein the coating layer is deposited on both surfaces of the substrate and inside the substrate, and the coating layer is deposited inside the substrate and fills a part of the first pores with the inorganic particles and the binder, and the second pores are located in a remaining part of the first pores. ### Claim 4 (depends on 1) The separator for a lithium secondary battery according to claim 1, wherein the separator has an ionic conductivity at 20 to 30° C. of 5.0*10−4 S/cm. ### Claim 5 (depends on 1) A lithium secondary battery comprising: a positive electrode; a negative electrode; and the separator of claim 1 interposed between the negative electrode and the positive electrode. ### Claim 6 (depends on 5) The lithium secondary battery according to claim 5, wherein the negative electrode comprises: a lithium free negative electrode consisting of a copper current collector; or a copper current collector a lithium metal layer located on the copper current collector. ### Claim 7 (depends on 5) The lithium secondary battery according to claim 5, wherein when charging the lithium secondary battery with a constant current of 0.1 C in a temperature range of 20 to 30° C. until reaching 4.25 V and then discharging the lithium secondary battery with a constant current of 0.5C until reaching 3 V is referred to as one charge/discharge cycle, at a point of a time a capacity retention rate according to the following Equation 1 reaches 80%, wherein n is 50 or more, Capacity retention rate (%)=100*{Discharge capacity after n cycles}/{Discharge capacity after 1 cycle}. [Equation 1] ### Claim 8 (depends on 1) A method for manufacturing the separator for a lithium secondary battery according to claim 1 comprising: preparing the substrate including the plurality of first pores therein; forming the coating layer including the inorganic particles, the binder, and the plurality of second pores on the surface of the substrate; and filling first pores with the ion conductive polymer. ### Claim 9 (depends on 8) The method for manufacturing a separator for a lithium secondary battery according to claim 8, wherein the filling the first pores is performed simultaneously with the forming the coating layer, and comprises: immersing the substrate in a solution containing the inorganic particles, the binder, and the ion conductive polymer; and recovering and drying the substrate immersed in the solution containing the inorganic particles, the binder, and the ion conductive polymer. ### Claim 10 (depends on 8) The method for manufacturing a separator for a lithium secondary battery according to claim 8, wherein the filling all the first pores is performed after the preparing the substrate and before the forming the coating layer, and comprises: immersing the substrate in a solution containing the ion conductive polymer; and recovering and drying the substrate immersed in the solution containing the ion conductive polymer. ### Claim 11 (depends on 10) The method for manufacturing a separator for a lithium secondary battery according to claim 10, wherein the forming the coating layer comprises: immersing the substrate obtained through the filling the first pores in a solution containing the inorganic particles and the binder; and recovering and drying the substrate immersed in the solution containing the inorganic particles and the binder.