# US 12,119,514 B2 · Slurry composition for non-aqueous secondary battery functional layer, separator for non-aqueous secondary battery, and non-aqueous secondary battery > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,119,514 B2 - Document ID: US12119514B2 - Status: Granted - Kind: B2 - Application number: 17/268,479 - Filed: 2019-08-21 - Published: 2021-06-17 - Granted: 2024-10-15 - Earliest claimed: 2018-08-24 - Assignees: Zeon Corporation - Applicants: Zeon Corporation - Inventors: Kazuki Asai; Yasuhiro Akita; Kenya Sonobe - Web page: https://patentgrep.com/patent/US12119514B2 ## CPC - H01M 50/403: Manufacturing processes of separators, membranes or diaphragms - H01M 50/446: Composite material consisting of a mixture of organic and inorganic materials - H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries - H01M 50/409: Separators, membranes or diaphragms characterised by the material - H01M 50/414: Synthetic resins, e.g. thermoplastics or thermosetting resins - H01M 50/417: Polyolefins - H01M 50/423: Polyamide resins - H01M 50/44: Fibrous material - H01M 50/443: Particulate material - H01M 50/449: having a layered structure - H01M 50/454: comprising a non-fibrous layer and a fibrous layer superimposed on one another - H01M 50/461: {with adhesive layers between electrodes and separators} - H01M 10/052: Li-accumulators - H01M 10/0566: Liquid materials - H01M 2300/0025: Organic electrolyte - 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 is a slurry composition for a functional layer that can form a functional layer capable of closely adhering strongly to a separator substrate and that can enhance rate characteristics of a secondary battery including a separator that includes the functional layer. The slurry composition for a functional layer contains a binder and a melamine compound. The binder is a polymer including at least one functional group selected from the group consisting of a carboxy group, a hydroxyl group, an amino group, an epoxy group, an oxazoline group, a sulfo group, a nitrile group, and an amide group. The melamine compound has a volume-average particle diameter of not less than 20 nm and not more than 300 nm and constitutes a proportion of not less than 0.5 mass % and not more than 85 mass % among the total of the binder and the melamine compound. ## Claims ### Claim 1 A slurry composition for a non-aqueous secondary battery functional layer comprising a binder and a melamine compound, wherein the binder is a polymer including at least one functional group selected from the group consisting of a carboxy group, a hydroxyl group, an amino group, an epoxy group, an oxazoline group, a sulfo group, a nitrile group, and an amide group, the binder has a volume-average particle diameter of not less than 20 nm and not more than 300 nm, the melamine compound has a volume-average particle diameter of not less than 20 nm and not more than 300 nm, where the volume-average particle diameter is measured by laser diffraction and determined as a particle diameter at which a cumulative undersize calculated from a small diameter end of a particle diameter distribution by volume measured by the later diffraction reaches 50%, the melamine compound constitutes a proportion of not less than 0.5 mass % and not more than 85 mass % among a total of the binder and the melamine compound. ### Claim 2 (depends on 1) The slurry composition for a non-aqueous secondary battery functional layer according to claim 1, further comprising non-conductive particles. ### Claim 3 (depends on 1) A separator for a non-aqueous secondary battery comprising: a separator substrate; and a functional layer on the separator substrate, wherein the functional layer is a dried product of the slurry composition for a non-aqueous secondary battery functional layer according to claim 1. ### Claim 4 (depends on 3) The separator for a non-aqueous secondary battery according to claim 3, wherein a portion of the dried product encroaches into the separator substrate. ### Claim 5 (depends on 3) The separator for a non-aqueous secondary battery according to claim 3, wherein the separator substrate is a microporous membrane containing either or both of a polyolefin resin and an aromatic polyamide resin or a non-woven fabric containing either or both of a polyolefin resin and an aromatic polyamide resin. ### Claim 6 (depends on 4) A non-aqueous secondary battery comprising a positive electrode, a negative electrode, a separator, and an electrolyte solution, wherein the separator is the separator for a non-aqueous secondary battery according to claim 4. ### Claim 7 (depends on 1) The slurry composition for a non-aqueous secondary battery functional layer according to claim 1, wherein the polymer is at least one selected from the group consisting of a polymer including a carboxy group and a hydroxyl group; a polymer including a carboxy group and an amide group; a polymer including a carboxy group, a nitrile group, and an amino group; and a polymer including a carboxy group, an epoxy group, a hydroxyl group, and a nitrile group. ### Claim 8 (depends on 1) The slurry composition for a non-aqueous secondary battery functional layer according to claim 1, wherein the polymer is at least one selected from the group consisting of a polymer including a carboxy group-containing monomer unit and a hydroxyl group-containing monomer unit; a polymer including a carboxy group-containing monomer unit and an amide group-containing monomer unit; a polymer including a carboxy group-containing monomer unit, a nitrile group-containing monomer unit, and an amino group-containing monomer unit; and a polymer including a carboxy group-containing monomer unit, an epoxy group-containing monomer unit, a hydroxyl group-containing monomer unit, and a nitrile group-containing monomer unit. ### Claim 9 (depends on 1) The slurry composition for a non-aqueous secondary battery functional layer according to claim 1, further comprising a solvent, wherein the solvent is water.