# US 12,119,483 B2 · Negative electrode plate, electrode assembly, lithium-ion battery and process for preparation thereof and apparatus containing lithium-ion battery > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,119,483 B2 - Document ID: US12119483B2 - Status: Granted - Kind: B2 - Application number: 17/536,118 - Filed: 2021-11-29 - Published: 2022-03-17 - Granted: 2024-10-15 - Earliest claimed: 2019-05-31 - Assignees: Contemporary Amperex Technology (Hong Kong) Limited - Applicants: Contemporary Amperex Technology Co., Limited - Inventors: Changliang Sheng; Shiwen Wang; Qisen Huang; Cheng Li; Chengdu Liang - Web page: https://patentgrep.com/patent/US12119483B2 ## CPC - H01M 4/0421: {involving vapour deposition} - H01M 4/366: {as layered products} - H01M 4/13: Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof - 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 4/1393: of electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx - H01M 4/1395: of electrodes based on metals, Si or alloys - H01M 4/382: {Lithium (H01M4/405 takes precedence)} - H01M 4/386: {Silicon or alloys based on silicon} - H01M 4/587: for inserting or intercalating light metals - H01M 4/62: Selection of inactive substances as ingredients for active masses, e.g. binders, fillers - H01M 4/628: {Inhibitors, e.g. gassing inhibitors, corrosion inhibitors} - H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries - H01M 2004/021: {Physical characteristics, e.g. porosity, surface area} - H01M 2004/027: {Negative 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 The present application discloses a negative electrode plate, an electrode assembly, a lithium-ion battery and process for the preparation thereof, and apparatus containing lithium-ion battery. The negative electrode plate includes a negative electrode current collector; a negative electrode active material layer disposed on the negative electrode current collector; a binder-free inorganic dielectric layer disposed on one side of the negative electrode active material layer away from the negative electrode current collector, the inorganic dielectric layer comprising an inorganic dielectric material, and the inorganic dielectric layer including at least a main body portion disposed on the surface of the negative electrode active material layer, the main body portion having a thickness of from 30 nm to 1000 nm; and a lithium metal layer disposed on the surface of the inorganic dielectric layer away from the negative electrode active material layer. ## Claims ### Claim 1 A lithium-ion battery, comprising an electrode assembly and an electrolyte, wherein the electrode assembly is an electrode assembly including a positive electrode plate, a negative electrode plate, and a separator, wherein the negative electrode plate is a negative electrode plate (10), comprising a negative electrode current collector (11); a negative electrode active material layer (12) disposed on the negative electrode current collector (11); a binder-free inorganic dielectric layer (13) disposed on one side of the negative electrode active material layer (12) away from the negative electrode current collector (11), the inorganic dielectric layer (13) comprising an inorganic dielectric material, and the inorganic dielectric layer (13) including at least a main body portion (131) disposed on the surface of the negative electrode active material layer (12), the main body portion (131) having a thickness of from 30 nm to 200 nm; and a lithium metal layer (14) disposed on the surface of the inorganic dielectric layer (13) away from the negative electrode active material layer (12), the inorganic dielectric layer (13) further comprises an extension portion (134) connected with the surface of the main body portion (131) facing toward the negative active material layer (132), the extension portion (134) extending along a wall surface of pores in the negative electrode active material layer (12) away from the main body portion (131) and covering the wall surface of pores in a form of a thin film, the dimension of the extension portion (134) in a thickness direction of the negative electrode active material layer (12) to the thickness of the main body portion (131) has a ratio of 1/1000 to 1/80; the inorganic dielectric material comprises oxides of Al; the negative electrode current collector is a copper foil; and the negative electrode active material layer (12) comprises a negative electrode active material, that is artificial graphite, wherein in the negative electrode plate per unit area of 2 cm×2 cm, a weight ratio of the lithium metal layer to the negative electrode active material layer is 0.5%˜5%; wherein a ratio of a capacity C1 of negative electrode per unit area to a capacity C2 of positive electrode per unit area is 1.2˜2.1; and wherein the capacity C1 of negative electrode per unit area, the capacity C2 of positive electrode per unit area and a capacity C3 of lithium metal layer per unit area satisfy C1/(C2+C3×K)≥1.05, where K is a utilization rate of metal lithium in the lithium metal layer. ### Claim 2 (depends on 1) The lithium-ion battery as claimed in claim 1, wherein in the negative electrode plate (10) per 2 cm×2 cm unit area, a weight ratio of the lithium metal layer (14) to the inorganic dielectric layer (13) is from 2:1 to 200:1. ### Claim 3 (depends on 1) The lithium-ion battery as claimed in claim 1, wherein a coverage ratio of the inorganic dielectric layer (13) on the surface of the negative electrode active material layer (12) δ is in a range of 50% to 100%. ### Claim 4 (depends on 1) The lithium-ion battery as claimed in claim 1, wherein the main body portion (131) comprises a plurality of inorganic dielectric regions, and the plurality of inorganic dielectric regions are disposed on the surface of the negative electrode active material layer (12) and adjacent inorganic dielectric regions are spaced apart from each other; or the main body portion (131) is a sheet-shaped body provided on the surface of the negative active material layer, and the sheet-shaped body has an opening penetratingly arranged along a thickness direction of the main body portion (131). ### Claim 5 (depends on 1) The lithium-ion battery as claimed in claim 1, wherein the inorganic dielectric material has an ion conductivity. ### Claim 6 (depends on 1) The lithium-ion battery as claimed in claim 1, wherein the inorganic dielectric material has an average particle size Dv50 of 1 nm to 100 nm. ### Claim 7 (depends on 1) The lithium-ion battery as claimed in claim 1, wherein the inorganic dielectric layer (13) is an inorganic dielectric layer disposed on the surface of the negative electrode active material layer, which is obtained by a vapor deposition method. ### Claim 8 (depends on 1) The lithium-ion battery as claimed in claim 1, wherein a surface of the inorganic dielectric layer (13) away from the negative active material layer (12) is an uneven surface to form a capillary channel for electrolyte infiltration between the lithium metal layer and the inorganic dielectric layer. ### Claim 9 (depends on 1) The lithium-ion battery as claimed in claim 1, wherein a binding force between the lithium metal layer (14) and the inorganic dielectric layer (13) is F1, a binding force between the inorganic dielectric layer (13) and the negative active material layer (12) is F2, and F1 and F2 satisfy: 0