# US 9,437,872 B2 · Negative electrode for rechargeable lithium battery, method of preparing the same and rechargeable lithium battery including the same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,437,872 B2 - Document ID: US9437872B2 - Status: Granted - Kind: B2 - Application number: 14/083,318 - Filed: 2013-11-18 - Published: 2014-06-05 - Granted: 2016-09-06 - Earliest claimed: 2012-12-04 - Assignees: Samsung SDI Co., Ltd. - Applicants: Samsung SDI Co., Ltd. - Inventors: Iwao Fukuchi - Web page: https://patentgrep.com/patent/US9437872B2 ## CPC - H01M 4/386: {Silicon or alloys based on silicon} - H01M 4/134: Electrodes based on metals, Si or alloys - H01M 4/1395: of electrodes based on metals, Si or alloys - H01M 4/387: {Tin or alloys based on tin} - H01M 4/622: {being polymers} - H01M 10/052: Li-accumulators - 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 negative electrode for a rechargeable lithium battery is disclosed. The negative electrode includes a current collector and a negative active material layer positioned on the current collector and including a negative active material and a binder, wherein the negative active material includes a silicon-based material, a tin-based material, or a combination thereof, and the binder includes an organic acid including a carboxyl group-containing polymer and an organic base having a cyclic structure. A method of preparing the same, and a rechargeable lithium battery including the same are also disclosed. ## Claims ### Claim 1 A negative electrode for a rechargeable lithium battery, comprising a current collector; and a negative active material layer positioned on the current collector and including a negative active material and a binder, wherein the negative active material comprises a silicon-based material, a tin-based material, or a combination thereof, the binder comprises an organic acid comprising a carboxyl group-containing polymer and an organic base having a cyclic structure, and wherein the organic base is selected from aromatic amine, alicyclic amine, and combination thereof. ### Claim 2 (depends on 1) The negative electrode for a rechargeable lithium battery of claim 1, wherein the organic acid comprises at least one selected from polyasparaginic acid, polyaspartic acid, alginic acid of a natural polymer, a homopolymer of acrylic acid, a copolymer of acrylic acid and another monomer, and any combinations thereof. ### Claim 3 (depends on 1) The negative electrode for a rechargeable lithium battery of claim 1, wherein the weight average molecular weight of the organic acid is in the range of about 5,000 g/mol to about 1,000,000 g/mol. ### Claim 4 (depends on 1) The negative electrode for a rechargeable lithium battery of claim 1, wherein the aromatic amine comprises at least one selected from paraphenylene diamine, metaphenylene diamine, aniline, 3,5-diaminobenzoic acid, melamine, and a derivative thereof. ### Claim 5 (depends on 1) The negative electrode for a rechargeable lithium battery of claim 1, wherein the alicyclic amine comprises at least one selected from cyclohexyl amine, cyclopentyl amine, norbornene amine, adamantane amine, and a derivative thereof. ### Claim 6 (depends on 1) The negative electrode for a rechargeable lithium battery of claim 1, wherein the cyclic amine comprises at least one selected from a pyridine, piperidine, azole-based compound, and a derivative thereof. ### Claim 7 (depends on 6) The negative electrode for a rechargeable lithium battery of claim 6, wherein the azole-based compound comprises at least one selected from pyrrole, imidazole, pyrazole, and a triazole. ### Claim 8 (depends on 1) The negative electrode for a rechargeable lithium battery of claim 1, wherein the binder comprises the organic acid and the organic base in a weight ratio of about 1:0.3 to about 1:1. ### Claim 9 (depends on 1) The negative electrode for a rechargeable lithium battery of claim 1, wherein the binder has a thermosetting temperature of less than or equal to about 200° C. ### Claim 10 (depends on 1) The negative electrode for a rechargeable lithium battery of claim 1, wherein the silicon-based material comprises a silicon-containing alloy. ### Claim 11 A method of preparing a negative electrode for a rechargeable lithium battery, comprising dissolving a carboxyl group-containing organic acid in water to obtain an acid solution; adding an organic base having a cyclic structure to the acid solution to obtain a binder solution; adding a negative active material including a silicon-based material, a tin-based material, or a combination thereof to the binder solution to provide a slurry; and coating the slurry on a current collector to form a negative active material layer. ### Claim 12 (depends on 11) The method of claim 11, wherein the viscosity of the acid solution is about 4,000 cps to about 5,000 cps. ### Claim 13 (depends on 11) The method of claim 11, wherein the binder solution has pH of about 6 to about 9. ### Claim 14 (depends on 1) A rechargeable lithium battery, comprising a positive electrode; the negative electrode according to claim 1; and an electrolyte. ### Claim 15 (depends on 11) The method of claim 11, wherein the organic acid comprises at least one selected from polyasparaginic acid, polyaspartic acid, alginic acid of a natural polymer, a homopolymer of acrylic acid, a copolymer of acrylic acid and another monomer, and any combinations thereof. ### Claim 16 (depends on 11) The method of claim 11, wherein the organic base is an amine-based compound having a cyclic structure. ### Claim 17 (depends on 11) The method of claim 11, wherein the binder comprises the organic acid and the organic base in a weight ratio of about 1:0.3 to about 1:1. ### Claim 18 (depends on 11) The method of claim 11, wherein the silicon-based material comprises a silicon-containing alloy.