# US 12,763,368 B2 · Electrochemical device and electronic device containing same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,763,368 B2 - Document ID: US12763368B2 - Status: Granted - Kind: B2 - Application number: 18/374,786 - Filed: 2023-09-29 - Published: 2024-02-08 - Granted: 2026-10-13 - Earliest claimed: 2021-03-31 - Assignees: Ningde Amperex Technology Limited - Applicants: Ningde Amperex Technology Limited - Inventors: Junfei Liu; Chao Tang - Web page: https://patentgrep.com/patent/US12763368B2 ## CPC - H01M 10/0567: characterised by the additives - H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries - H01M 10/0568: characterised by the solutes - H01M 2004/021: {Physical characteristics, e.g. porosity, surface area} - H01M 2004/027: {Negative electrodes} - H01M 4/0404: {by coating on electrode collectors} - H01M 4/133: Electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx - H01M 4/134: Electrodes based on metals, Si or alloys - H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY ## Abstract An electrochemical device includes a negative electrode and an electrolytic solution. The negative electrode includes a negative current collector and a negative active material layer disposed on at least one surface of the negative current collector. The negative active material layer includes a first region and a second region. A thickness of any position of the first region is less than an average thickness of the second region. The electrolytic solution includes a salt containing a P—O bond, and the salt accounts for a given content. The electrochemical device according to this application achieves excellent cycle performance. ## Claims ### Claim 1 An electrochemical device, comprising a negative electrode and an electrolytic solution; wherein the negative electrode comprises a negative current collector and a negative active material layer disposed on at least one surface of the negative current collector, the negative active material layer comprises a first region and a second region, and a thickness D1 of any position of the first region is less than an average thickness D2 of the second region; and the electrolytic solution comprises a salt containing a P—O bond, and a content of the salt containing a P—O bond is less than or equal to 0.05 gram per 1 cm2 of the first region. ### Claim 2 (depends on 1) The electrochemical device according to claim 1, wherein D1≤D2×97%. ### Claim 3 (depends on 1) The electrochemical device according to claim 1, wherein the salt containing P—O bond comprises at least one selected from the group consisting of LiPO2F2, NaPO2F2, KPO2F2, CsPO2F2, lithium difluorobisoxalate phosphate, and lithium tetrafluorooxalate phosphate. ### Claim 4 (depends on 1) The electrochemical device according to claim 1, wherein the electrolytic solution further comprises a first additive; and the first additive comprises at least one selected from the group consisting of 1,3-propane sultone, fluoroethylene carbonate, vinylene carbonate, succinic anhydride, and maleic anhydride. ### Claim 5 (depends on 4) The electrochemical device according to claim 4, wherein a content of the first additive is 0.001 to 0.2 gram per 1 cm2 of the first region. ### Claim 6 (depends on 1) The electrochemical device according to claim 1, wherein the electrolytic solution further comprises a second additive; the second additive comprises at least one selected from the group consisting of lithium tetrafluoroborate, lithium bis(fluorosulfonyl)imide, lithium bis(trifluoromethylsulfonyl)imide, lithium 4,5-dicyano-2-(trifluoromethyl)imidazole, lithium difluoro(oxalato)borate, lithium bis(oxalato)borate, adiponitrile, succinonitrile, 1,3,6-hexanetricarbonitrile, 1,2,3-tris(2-cyanooxy)propane, 1,4-dicyano-2-butene, glutaronitrile, and tris(2-cyanoethyl)phosphine; based on a weight of the electrolytic solution, a content of the second additive is in a range of 0.1 wt % to 10 wt %. ### Claim 7 (depends on 1) The electrochemical device according to claim 1, wherein the first region is located at an edge of the negative active material layer, and a width of the first region is less than or equal to 15 μm. ### Claim 8 (depends on 1) The electrochemical device according to claim 1, wherein an area of the first region is less than or equal to 20% of a total area of the negative active material layer. ### Claim 9 (depends on 1) The electrochemical device according to claim 1, wherein the negative active material layer comprises a negative active material, and a median particle diameter of the negative active material is 5 μm to 20 μm. ### Claim 10 (depends on 7) The electrochemical device according to claim 7, wherein the negative active material layer comprises a negative active material, and a median particle diameter of the negative active material is 5 μm to 20 μm. ### Claim 11 An electronic device, comprising an electrochemical device, the electrochemical device comprises a negative electrode and an electrolytic solution; wherein the negative electrode comprises a negative current collector and a negative active material layer disposed on at least one surface of the negative current collector, the negative active material layer comprises a first region and a second region, and a thickness D1 of any position of the first region is less than an average thickness D2 of the second region; and the electrolytic solution comprises a salt containing a P—O bond, and a content of the salt containing a P—O bond is less than or equal to 0.05 gram per 1 cm2 of the first region. ### Claim 12 (depends on 11) The electronic device according to claim 11, wherein D1≤D2×97%. ### Claim 13 (depends on 11) The electronic device according to claim 11, wherein the salt containing P—O bond comprises at least one selected from the group consisting of LiPO2F2, NaPO2F2, KPO2F2, CsPO2F2, lithium difluorobisoxalate phosphate, and lithium tetrafluorooxalate phosphate. ### Claim 14 (depends on 11) The electronic device according to claim 11, wherein the electrolytic solution further comprises a first additive; and the first additive comprises at least one selected from the group consisting of 1,3-propane sultone, fluoroethylene carbonate, vinylene carbonate, succinic anhydride, and maleic anhydride. ### Claim 15 (depends on 14) The electronic device according to claim 14, wherein a content of the first additive is 0.001 to 0.2 gram per 1 cm2 of the first region. ### Claim 16 (depends on 11) The electronic device according to claim 11, wherein the electrolytic solution further comprises a second additive; the second additive comprises at least one selected from the group consisting of lithium tetrafluoroborate, lithium bis(fluorosulfonyl)imide, lithium bis(trifluoromethylsulfonyl)imide, lithium 4,5-dicyano-2-(trifluoromethyl)imidazole, lithium difluoro(oxalato)borate, lithium bis(oxalato)borate, adiponitrile, succinonitrile, 1,3,6-hexanetricarbonitrile, 1,2,3-tris(2-cyanooxy)propane, 1,4-dicyano-2-butene, glutaronitrile, and tris(2-cyanoethyl)phosphine; based on a weight of the electrolytic solution, a content of the second additive is in a range of 0.1 wt % to 10 wt %. ### Claim 17 (depends on 11) The electronic device according to claim 11, wherein the first region is located at an edge of the negative active material layer, and a width of the first region is less than or equal to 15 μm. ### Claim 18 (depends on 11) The electronic device according to claim 11, wherein an area of the first region is less than or equal to 20% of a total area of the negative active material layer. ### Claim 19 (depends on 11) The electronic device according to claim 11, wherein the negative active material layer comprises a negative active material, and a median particle diameter of the negative active material is 5 μm to 20 μm. ### Claim 20 (depends on 17) The electronic device according to claim 17, wherein the negative active material layer comprises a negative active material, and a median particle diameter of the negative active material is 5 μm to 20 μm.