# US 11,114,670 B2 · Negative electrode and method for preparing negative electrode > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,114,670 B2 - Document ID: US11114670B2 - Status: Granted - Kind: B2 - Application number: 16/304,998 - Filed: 2017-10-26 - Published: 2020-07-23 - Granted: 2021-09-07 - Earliest claimed: 2016-11-08 - Assignees: LG Chem, Ltd. - Applicants: LG Chem, Ltd. - Inventors: Su Min Lee; Sun Young Shin; Su Yeon Lee; Eun Kyung Kim - Web page: https://patentgrep.com/patent/US11114670B2 ## CPC - H01M 4/583: Carbonaceous material, e.g. graphite-intercalation compounds or CFx - H01M 4/663: {containing carbon or carbonaceous materials as conductive part, e.g. graphite, carbon fibres} - H01M 4/133: Electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx - H01M 4/1393: of electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx - H01M 4/36: Selection of substances as active materials, active masses, active liquids - H01M 4/364: {as mixtures} - 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 A negative electrode according to one embodiment of the present invention comprises a current collector and a negative electrode active material layer disposed on the current collector, wherein the negative electrode active material layer includes a first particle and a second particle, the first particle includes a first core including artificial graphite; and a first shell disposed on the first core, said first shell including an oxide of the artificial graphite, wherein a sphericity of the first particle measured through a particle shape analyzer is from 0.94 to 0.98, the second particle is artificial graphite having sphericity measured through the particle shape analyzer of 0.70 to 0.92, and a weight ratio of the first particle and the second particle is from 1:1 to 1:9. ## Claims ### Claim 1 A negative electrode comprising: a current collector; and a negative electrode active material layer disposed on the current collector, wherein the negative electrode active material layer includes first particles, second particles and third particles, each first particle comprises a first core including artificial graphite; and a first shell disposed on the first core, said first shell including an oxide of the artificial graphite, a sphericity of each first particle measured through a particle shape analyzer is from 0.94 to 0.98, each second particle is artificial graphite having a sphericity measured through the particle shape analyzer of 0.70 to 0.92, each third particle comprises a second core including natural graphite; and a second shell disposed on the second core, said second shell including an oxide of the natural graphite, and each third particle having a sphericity measured through the particle shape analyzer from 0.94 to 0.98, and a weight ratio of first particles to second particles is from 1:1 to 1:9. ### Claim 2 (depends on 1) The negative electrode of claim 1, wherein the first particles have an average particle diameter (D50) of 10 μm to 25 μm. ### Claim 3 (depends on 1) The negative electrode of claim 1, wherein the first cores have an average particle diameter (D50) of 10 μm to 20 μm. ### Claim 4 (depends on 1) The negative electrode of claim 1, wherein each of the first shells have a thickness of 1 nm to 200 nm. ### Claim 5 (depends on 1) The negative electrode of claim 1, wherein the first particles have a tap density of 0.95 g/cm3 to 1.3 g/cm3, wherein the tap density is measured after tapping 1,000 times. ### Claim 6 (depends on 1) The negative electrode of claim 1, wherein the second particles have an average particle diameter (D50) of 10 μm to 25 μm. ### Claim 7 (depends on 1) The negative electrode of claim 1, wherein an oxygen atom content is from 1200 mg/kg to 2500 mg/kg with respect to a total weight of the first particles. ### Claim 8 (depends on 1) The negative electrode of claim 1, wherein a total weight of the first particles and the second particles is from 95% by weight to 99% by weight with respect to a total weight of the negative electrode active material layer. ### Claim 9 (depends on 1) The negative electrode of claim 1, wherein a weight ratio of the first particles, the second particles and the third particles is 10-30:40-80:10-30. ### Claim 10 (depends on 1) The negative electrode of claim 1, wherein the third particles have an average particle diameter (D50) of 7 μm to 25 μm. ### Claim 11 (depends on 1) The negative electrode of claim 1, wherein the second cores have an average particle diameter (D50) of 5 μm to 25 μm. ### Claim 12 (depends on 1) The negative electrode of claim 1, wherein each of the second shells have a thickness of 1 nm to 200 nm. ### Claim 13 (depends on 1) The negative electrode of claim 1, wherein the third particles have a tap density of 1.0 g/cm3 to 1.2 g/cm3, wherein the tap density is measured after tapping 1,000 times. ### Claim 14 A method for preparing a negative electrode comprising: preparing a negative electrode slurry (step 1); and coating the negative electrode slurry on a current collector and then drying the result (step 2), wherein the negative electrode slurry includes first particles, second particles, and third particles, each first particle comprises a first core including artificial graphite; and a first shell disposed on the first core, said first shell including an oxide of the artificial graphite, a sphericity of each first particle measured through a particle shape analyzer is from 0.94 to 0.98, each second particle is artificial graphite having a sphericity measured through the particle shape analyzer of 0.70 to 0.92, each third particle comprises a second core including natural graphite; and a second shell disposed on the second core, said second shell including an oxide of the natural graphite, and each third particle having a sphericity measured through the particle shape analyzer from 0.94 to 0.98, and a weight ratio of first particles to second particles is from 1:1 to 1:9. ### Claim 15 (depends on 1) The negative electrode of claim 1, wherein each third particle has a sphericity measured through the particle shape analyzer from 0.96 to 0.97.