# US 2026/0100352 A1 · Negative electrode active material for lithium secondary battery and lithium secondary battery comprising the same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2026/0100352 A1 - Document ID: US20260100352A1 - Status: Published application - Kind: A1 - Application number: 19/416,111 - Filed: 2025-12-11 - Published: 2026-04-09 - Earliest claimed: 2017-10-27 - Assignees: LG Energy Solution, Ltd. - Applicants: LG Energy Solution, Ltd. - Inventors: Su Min LEE; Yong Ju LEE; Eun Kyung KIM; Rae Hwan JO; Dong Hyuk KIM; Se Mi PARK - Web page: https://patentgrep.com/patent/US20260100352A1 ## CPC - H01M 4/364: {as mixtures} - 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 4/36: Selection of substances as active materials, active masses, active liquids - H01M 4/38: of elements or alloys - H01M 4/386: {Silicon or alloys based on silicon} - H01M 4/483: {for non-aqueous cells (H01M4/485 takes precedence)} - H01M 4/587: for inserting or intercalating light metals - 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 A negative electrode active material for a lithium secondary battery, the negative electrode active material including, based on 100 parts by weight of the total negative electrode active material, 5 parts by weight to 20 parts by weight of a first carbon-based particle, 55 parts by weight to 90 parts by weight of a second carbon-based particle, and 1 part by weight to 40 parts by weight of a silicon-based particle, wherein the specific surface area of the first carbon-based particle is 1.5 m2/g to 4.5 m2/g, the specific surface area of the second carbon-based particle is 0.4 m2/g to 1.5 m2/g, and the specific surface area of the first carbon-based particle is greater than the specific surface area of the second carbon-based particle, and capable of solving the problem of lifespan deterioration which may be caused by the use of a silicon-based particle as a negative electrode active material. ## Claims ### Claim 1 A negative electrode active material for a lithium secondary battery, the negative electrode active material comprising: 5 parts by weight to 20 parts by weight of a first carbon-based particle based on 100 parts by weight of a total negative electrode active material; 73 parts by weight to 90 parts by weight of a second carbon-based particle based on 100 parts by weight of the total negative electrode active material; and 3 parts by weight to 20 parts by weight of a silicon-based particle based on 100 parts by weight of the total negative electrode active material, wherein the first carbon-based particle has a c-axis direction crystal size Lc(002) of 90 nm to 120 nm when measured by XRD, and wherein the second carbon-based particle has a c-axis direction crystal size Lc(002) of 60 nm to 90 nm when measured by XRD. ### Claim 2 (depends on 1) The negative electrode active material of claim 1, wherein the first carbon-based particle has an average particle diameter (D50) of 8 μm to 16 μm. ### Claim 3 (depends on 1) The negative electrode active material of claim 1, wherein the first carbon-based particle has an average particle diameter (D50) of 11 μm to 16 μm. ### Claim 4 (depends on 1) The negative electrode active material of claim 1, wherein the second carbon-based particle has an average particle diameter (D50) of 15 μm to 25 μm. ### Claim 5 (depends on 1) The negative electrode active material of claim 1, wherein the second carbon-based particle has an average particle diameter (D50) of 17 μm to 24 μm. ### Claim 6 (depends on 1) The negative electrode active material of claim 1, wherein a specific surface area of the first carbon-based particle is 1.5 m2/g to 4.5 m2/g, and a specific surface area of the second carbon-based particle is 0.4 m2/g to 1.5 m2/g. ### Claim 7 (depends on 1) The negative electrode active material of claim 1, wherein a specific surface area of the first carbon-based particle is greater than a specific surface area of the second carbon-based particle. ### Claim 8 (depends on 1) The negative electrode active material of claim 1, wherein the first carbon-based particle has a tap density of 0.9 g/cc to 1.2 g/cc. ### Claim 9 (depends on 1) The negative electrode active material of claim 1, wherein the second carbon-based particle has a tap density of 0.7 g/cc to 1.0 g/cc. ### Claim 10 (depends on 1) The negative electrode active material of claim 1, wherein the first carbon-based particle has a sphericity of 0.9 or more. ### Claim 11 (depends on 1) The negative electrode active material of claim 1, wherein the second carbon-based particle has a sphericity of 0.9 or less. ### Claim 12 (depends on 1) The negative electrode active material of claim 1, wherein a ratio of a total amount of the first carbon-based particle and the second carbon-based particle to an amount of the silicon-based particle is in a range of 60:40 to 99:1. ### Claim 13 (depends on 1) The negative electrode active material of claim 1, wherein the first carbon-based particle is natural graphite, and the second carbon-based particle is artificial graphite. ### Claim 14 (depends on 1) The negative electrode active material of claim 1, wherein the silicon-based particle is a mixture of one or more selected from the group consisting of Si, a silicon oxide particle, a Si-metal alloy, and a silicon-carbon complex, wherein the silicon oxide particle has a formula SiOx, where 0