# US 12,015,118 B2 · Electrode electrochemical device and electronic device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,015,118 B2 - Document ID: US12015118B2 - Status: Granted - Kind: B2 - Application number: 17/707,137 - Filed: 2022-03-29 - Published: 2022-07-14 - Granted: 2024-06-18 - Earliest claimed: 2018-02-26 - Assignees: Ningde Amperex Technology Limited - Applicants: Ningde Amperex Technology Limited - Inventors: Chaowang Lin; Fan Yang; Yisong Su; Huawei Zhong; Changming Qu; Xiaozhen Zhang - Web page: https://patentgrep.com/patent/US12015118B2 ## CPC - H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries - H01M 4/131: Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx - H01M 4/366: {as layered products} - H01M 4/382: {Lithium (H01M4/405 takes precedence)} - H01M 4/386: {Silicon or alloys based on silicon} - H01M 4/485: of mixed oxides or hydroxides for inserting or intercalating light metals, e.g. LiTi2O4 or LiTi2OxFy (H01M4/505, H01M4/525 take precedence) - H01M 4/50: of manganese - H01M 4/52: of nickel, cobalt or iron - 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 4/583: Carbonaceous material, e.g. graphite-intercalation compounds or CFx - H01M 4/587: for inserting or intercalating light metals - H01M 4/622: {being polymers} - H01M 4/623: {fluorinated polymers} - H01M 4/661: {Metal or alloys, e.g. alloy coatings (H01M4/669 take precedence)} - H01M 2004/027: {Negative electrodes} - H01M 2004/028: {Positive electrodes} - Y02E 60/10: Energy storage using batteries - Y02P 70/50: Manufacturing or production processes characterised by the final manufactured product - 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 An electrode includes a current collector; a first active material layer including a first active material; and a second active material layer including a second active material; wherein the first active material layer is arranged between the current collector and the second active material layer. The first active material layer is formed on a surface of the current collector, and a particle size of 90% accumulative volume of the first active material is less than 40 μm. The active material layer is used to ensure that the electrochemical device and the electronic device do not generate a short circuit when pressed by an external force, thereby ensuring the mechanical safety performance of the electrochemical device and the electronic device. ## Claims ### Claim 1 An electrode, comprising: a current collector; a first layer comprising a first material; and a second layer comprising a second material; wherein the first layer is arranged between the current collector and the second layer, the first layer is formed on a surface of the current collector, and a particle size of 90% accumulative volume of the first material is less than 40 μm; wherein a total compaction density of the first layer and the second layer is greater than 3.2 g/cc. ### Claim 2 (depends on 1) The electrode according to claim 1, wherein a thickness of the first layer is not less than the particle size of 90% accumulative volume of the first material in the first layer. ### Claim 3 (depends on 1) The electrode according to claim 1, wherein a ratio of the average particle size of the second material to the average particle size of the first material is from 1:1 to 40:1. ### Claim 4 (depends on 1) The electrode according to claim 1, wherein the first material has an average particle size in a range of 0.2 μm to 15 μm. ### Claim 5 (depends on 1) The electrode according to claim 1, wherein a compaction density of the first layer is greater than 2.8 g/cc, and a compaction density of the second layer is greater than 3.3 g/cc. ### Claim 6 (depends on 1) The electrode according to claim 1, wherein the first layer has a lower compaction density than the second layer. ### Claim 7 (depends on 1) The electrode according to claim 1, wherein the first material comprises one selected from the group consisting of lithium cobaltate, lithium manganate, lithium nickelate, lithium nickel cobalt manganese oxide, lithium iron phosphate, lithium iron manganese phosphate, lithium vanadium phosphate, lithium vanadyl phosphate, lithium-rich manganese-based materials, lithium nickel cobalt aluminate and lithium titanate, and combinations thereof. ### Claim 8 (depends on 1) The electrode according to claim 1, wherein the second material comprises one selected from the group consisting of lithium cobaltate, lithium nickel cobalt manganese oxide, lithium nickel cobalt aluminum oxide, lithium-rich manganese-based material, lithium iron phosphate, and combinations thereof. ### Claim 9 (depends on 1) The electrode according to claim 1, wherein the first material comprises one selected from the group consisting of artificial graphite, natural graphite, mesocarbon microbeads, soft carbon, hard carbon, silicon, silicon carbide, lithium titanate, and combinations thereof. ### Claim 10 An electrochemical device, comprising an electrode, wherein the electrode comprises: a current collector; a first layer comprising a first material; and a second layer comprising a second material; wherein the first layer is arranged between the current collector and the second layer, the first layer is formed on a surface of the current collector, and a particle size of 90% accumulative volume of the first material is less than 40 μm; wherein a total compaction density of the first layer and the second layer is greater than 3.2 g/cc. ### Claim 11 (depends on 10) The electrochemical device according to claim 10, wherein a thickness of the first layer is not less than the particle size of 90% accumulative volume of the first material in the first layer. ### Claim 12 (depends on 10) The electrochemical device according to claim 10, wherein a ratio of the average particle size of the second material to the average particle size of the first material is from 1:1 to 40:1. ### Claim 13 (depends on 10) The electrochemical device according to claim 10, wherein the first material has an average particle size in a range of 0.2 μm to 15 μm. ### Claim 14 (depends on 10) The electrochemical device according to claim 10, wherein a compaction density of the first layer is greater than 2.8 g/cc, and a compaction density of the second layer is greater than 3.3 g/cc. ### Claim 15 (depends on 10) The electrochemical device according to claim 10, wherein the first layer has a lower compaction density than the second layer. ### Claim 16 (depends on 10) The electrochemical device according to claim 10, wherein the first material comprises one selected from the group consisting of lithium cobaltate, lithium manganate, lithium nickelate, lithium nickel cobalt manganese oxide, lithium iron phosphate, lithium iron manganese phosphate, lithium vanadium phosphate, lithium vanadyl phosphate, lithium-rich manganese-based materials, lithium nickel cobalt aluminate and lithium titanate, and combinations thereof. ### Claim 17 (depends on 10) The electrochemical device according to claim 10, wherein the second material comprises one selected from the group consisting of lithium cobaltate, lithium nickel cobalt manganese oxide, lithium nickel cobalt aluminum oxide, lithium-rich manganese-based material, lithium iron phosphate, and combinations thereof. ### Claim 18 (depends on 10) The electrochemical device according to claim 10, wherein the first material comprises one selected from the group consisting of artificial graphite, natural graphite, mesocarbon microbeads, soft carbon, hard carbon, silicon, silicon carbide, lithium titanate, and combinations thereof. ### Claim 19 An electronic device, comprising an electrochemical device, the electrochemical device comprising an electrode, wherein the electrode comprises: a current collector; a first layer comprising a first material; and a second layer comprising a second material; wherein the first layer is arranged between the current collector and the second layer, the first layer is formed on a surface of the current collector, and a particle size of 90% accumulative volume of the first material is less than 40 μm; wherein a total compaction density of the first layer and the second layer is greater than 3.2 g/cc. ### Claim 20 (depends on 19) The electronic device according to claim 19, wherein the first layer has a lower compaction density than the second layer.