# US 2025/0158024 A1 · Positive electrode and method of producing the same, and non-aqueous electrolyte secondary battery including positive electrode and method of producing the same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2025/0158024 A1 - Document ID: US20250158024A1 - Status: Published application - Kind: A1 - Application number: 18/896,898 - Filed: 2024-09-26 - Published: 2025-05-15 - Earliest claimed: 2023-11-10 - Assignees: Prime Planet Energy & Solutions, Inc. - Applicants: Prime Planet Energy & Solutions, Inc. - Inventors: Keiichi TAKAHASHI; Takatoshi HIGUCHI - Web page: https://patentgrep.com/patent/US20250158024A1 ## CPC - H01M 4/364: {as mixtures} - H01M 4/0404: {by coating on electrode collectors} - H01M 4/043: {involving compressing or compaction} - H01M 4/0471: {involving thermal treatment, e.g. firing, sintering, backing particulate active material, thermal decomposition, pyrolysis} - H01M 4/131: Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx - H01M 4/1391: of electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx - H01M 4/366: {as layered products} - 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 4/58: of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy; of polyanionic structures, e.g. phosphates, silicates or borates - H01M 4/62: Selection of inactive substances as ingredients for active masses, e.g. binders, fillers - H01M 4/623: {fluorinated polymers} - H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries - H01M 10/058: Construction or manufacture - H01M 2004/021: {Physical characteristics, e.g. porosity, surface area} - H01M 2004/028: {Positive electrodes} - 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 A positive electrode has an active material layer. The active material layer includes an active material including at least a first active material, and a binding agent. The first active material is a first secondary particle consisting of first primary particles aggregated together and having a surface thereof covered with a boron compound. The first secondary particle is a lithium-(transition metal) composite oxide having a titanium compound at a grain boundary between the first primary particles and including Ni at 75 mol % or more relative to a total number of moles of metallic element except Li. The binding agent covers the first active material. ## Claims ### Claim 1 A positive electrode comprising: an active material layer, wherein the active material layer includes an active material including at least a first active material, and a binding agent, the first active material is a first secondary particle consisting of first primary particles aggregated together and having a surface thereof covered with a boron compound, the first secondary particle is a lithium-(transition metal) composite oxide having a titanium compound at a grain boundary between the first primary particles and including Ni at 75 mol % or more relative to a total number of moles of metallic element except Li, and the binding agent covers the first active material. ### Claim 2 (depends on 1) The positive electrode according to claim 1, wherein the binding agent covers 60% or more of a surface of the first active material. ### Claim 3 (depends on 1) The positive electrode according to claim 1, wherein the boron compound includes Li. ### Claim 4 (depends on 1) The positive electrode according to claim 1, wherein a content of B in the first active material is from 0.5 to 3 mol % relative to the total number of moles of metallic element except Li. ### Claim 5 (depends on 1) The positive electrode according to claim 1, wherein the first secondary particle further forms a solid solution with Ti. ### Claim 6 (depends on 1) The positive electrode according to claim 1, wherein the first secondary particle includes Ti at 1 to 5 mol % relative to the total number of moles of metallic element except Li. ### Claim 7 (depends on 1) The positive electrode according to claim 1, wherein the binding agent is polyvinylidene difluoride, and a content of the polyvinylidene difluoride in the active material layer is from 0.3 to 2 wt % relative to a weight of the active material layer. ### Claim 8 (depends on 1) The positive electrode according to claim 1, wherein the first secondary particle includes a lithium-(transition metal) composite oxide represented by the following formula (I): Lix(Ni(1-y-z)CoyMez)O2 (I) [where 1.0≤x≤1.2, 0.02≤y≤0.15, and 0.02≤z≤0.18 are satisfied, and Me includes Ti and optionally includes one or more selected from the group consisting of Mn, Al, Mg, Mo, Nb, and Zr]. ### Claim 9 (depends on 1) The positive electrode according to claim 1, wherein an amount of remaining alkali in the first active material is from 0.03 to 0.3 wt %. ### Claim 10 (depends on 1) The positive electrode according to claim 1, wherein the active material further includes a second active material, the first secondary particle consists of more than 100 first primary particles aggregated together, the second active material is a single particle, or a second secondary particle consisting of up to 100 second primary particles aggregated together, and an average particle size (D50) of the second active material is equal to or less than ⅓ of an average particle size (D50) of the first active material. ### Claim 11 (depends on 10) The positive electrode according to claim 10, wherein the second active material includes a single-crystal particle. ### Claim 12 (depends on 1) The positive electrode according to claim 1, wherein an elastic modulus of the positive electrode is from 3 to 12 GPa. ### Claim 13 (depends on 1) A non-aqueous electrolyte secondary battery comprising the positive electrode according to claim 1. ### Claim 14 A method of producing a positive electrode having an active material layer, the method comprising: forming a composite material layer by applying a composite material to a positive electrode current collector, drying, and compression; and performing heat treatment of the composite material layer at a temperature within the range of a melting point of a binding agent to a pyrolytic temperature thereof, wherein the composite material includes an active material including at least a first active material, and the binding agent, the first active material is a first secondary particle consisting of first primary particles aggregated together and having a surface thereof covered with a boron compound, and the first secondary particle is a lithium-(transition metal) composite oxide having a titanium compound at a grain boundary between the first primary particles and including Ni at 75 mol % or more relative to a total number of moles of metallic element except Li. ### Claim 15 (depends on 14) The method of producing a positive electrode according to claim 14, wherein a content of B in the first active material is from 0.5 to 3 mol %, and the first secondary particle includes Ti at 1 to 5 mol % relative to the total number of moles of metallic element except Li. ### Claim 16 (depends on 14) The method of producing a positive electrode according to claim 14, wherein the binding agent is polyvinylidene difluoride, and a content of the polyvinylidene difluoride in the active material layer is from 0.3 to 2 wt % relative to a weight of the active material layer. ### Claim 17 (depends on 14) A method of producing a non-aqueous electrolyte secondary battery, the method comprising producing a positive electrode by the method of producing a positive electrode according to claim 14.