# US 8,568,923 B1 · Electrode for lithium secondary battery > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,568,923 B1 - Document ID: US8568923B1 - Status: Granted - Kind: B1 - Application number: 13/866,265 - Filed: 2013-04-19 - Published: 2013-10-24 - Granted: 2013-10-29 - Earliest claimed: 2004-02-16 - Assignees: LG Chem, Ltd. - Applicants: LG Chem, Ltd. - Inventors: Young Soo Kim; Soon Ho Ahn - Web page: https://patentgrep.com/patent/US8568923B1 ## CPC - H01M 4/0419: {involving spraying} - H01M 4/0402: {Methods of deposition of the material} - H01M 4/0404: {by coating on electrode collectors} - H01M 4/139: Processes of manufacture - 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 10/0567: characterised by the additives - H01M 10/4235: {Safety or regulating additives or arrangements in electrodes, separators or electrolyte (H01M10/4242 takes precedence)} - H01M 2300/004: Three solvents - 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 Disclosed is a method for forming an electrode comprising a protective layer, which comprises: dispersing or dissolving an aliphatic nitrile compound into a solvent to provide a coating solution; coating a surface of the electrode with the coating solution, said electrode having an electrode active material coated thereon; and removing the solvent used in the coating solution by drying to form a protective layer comprising an aliphatic nitrile compound-electrode active material complex. ## Claims ### Claim 1 A method for forming an electrode comprising a protective layer, which comprises: dispersing or dissolving an aliphatic nitrile compound into a solvent to provide a coating solution; coating a surface of the electrode with the coating solution, said electrode having an electrode active material coated thereon; and removing the solvent used in the coating solution by drying to form a protective layer comprising an aliphatic nitrile compound-electrode active material complex. ### Claim 2 (depends on 1) The method according to claim 1, wherein the aliphatic nitrile compound is an aliphatic dinitrile compound. ### Claim 3 (depends on 1) The method according to claim 1, wherein the aliphatic nitrile compound is represented by the following formula 1: wherein R is C2-C15 alkylene. ### Claim 4 (depends on 1) The method according to claim 1, wherein the aliphatic nitrile compound is selected from the group consisting of succinonitrile, glutaronitrile, aponitrile, pimelonitrile, octanedinitrile, azelonitrile, sebaconitrile, 1,9-dicyanononane and dodecanedinitrile. ### Claim 5 (depends on 1) The method according to claim 1, wherein the protective layer comprises a ligand-metal bond between the electrode active material and the aliphatic nitrile compound. ### Claim 6 (depends on 1) The method according to claim 1, wherein the coating method is performed by dip coating or spray coating. ### Claim 7 (depends on 1) The method according to claim 1, wherein the solvent is selected from the group consisting of acetone, THF (tetrahydrofuran), NMP (N-methyl-2-pyrrolidone) and carbonate solvent. ### Claim 8 (depends on 7) The method according to claim 7, wherein the solvent is a carbonate solvent selected from the group consisting of ethylene carbonate, propylene carbonate, gamma-butyrolactone, diethyl carbonate, dimethyl carbonate, and ethylmethyl carbonate. ### Claim 9 (depends on 1) The method according to claim 1, wherein the drying step is performed at a controlled temperature of between 90° C. and 110° C. ### Claim 10 (depends on 1) The method according to claim 1, wherein the drying step is performed at a controlled drying rate of 3 m/min or less under a controlled vent flow of 2000-3000 rpm. ### Claim 11 (depends on 1) The method according to claim 1, wherein the electrode is treated at a high temperature of 30° C.-90° C. before or after assemblage of a battery. ### Claim 12 (depends on 1) The method according to claim 1, wherein the electrode active material comprises an oxide of a transition metal of the electrode active material. ### Claim 13 (depends on 1) The method according to claim 1, wherein the aliphatic nitrile compound is present in an amount of 1 to 10 weight percent, based on the total weight of the electrode active material. ### Claim 14 (depends on 1) The method according to claim 1, wherein the aliphatic nitrile compound is present in an amount of 1 to 5 weight percent, based on the total weight of the electrode active material. ### Claim 15 (depends on 1) The method according to claim 1, wherein the aliphatic nitrile compound is present in an amount of 1 to 2.5 weight percent, based on the total weight of the electrode active material. ### Claim 16 (depends on 1) The method according to claim 1, wherein the aliphatic nitrile compound is present in an amount of 1 to 20 weight percent, based on the total weight of electrolyte present in a battery. ### Claim 17 (depends on 1) The method according to claim 1, wherein the aliphatic nitrile compound is used in the range of between 1:9 and 9:1, expressed in the weight ratio to the solvent. ### Claim 18 (depends on 1) A lithium secondary battery comprising an electrode prepared by the method of claim 1 as a cathode.