# US 12,218,359 B2 · Conductive material dispersion, and electrode and lithium secondary battery manufactured using the same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,218,359 B2 - Document ID: US12218359B2 - Status: Granted - Kind: B2 - Application number: 18/377,994 - Filed: 2023-10-09 - Published: 2024-02-08 - Granted: 2025-02-04 - Earliest claimed: 2019-05-17 - Assignees: LG Energy Solution, Ltd. - Applicants: LG Energy Solution, Ltd. - Inventors: Dong Hyun Kim; Houng Sik Yoo; Seong Kyun Kang; Gye Min Kwon; Hyeon Choi - Web page: https://patentgrep.com/patent/US12218359B2 ## CPC - H01M 4/625: {Carbon or graphite} - C01B 32/174: Derivatisation; Solubilisation; Dispersion in solvents - C09C 1/56: Treatment of carbon black {; Purification} - H01B 1/24: the conductive material comprising carbon-silicon compounds, carbon or silicon - H01M 4/0404: {by coating on electrode collectors} - H01M 4/13: Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof - H01M 4/622: {being polymers} - H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries - C01B 2202/22: Electronic properties - C01B 2202/32: Specific surface area - C01P 2006/12: Surface area - C01P 2006/40: Electric properties - H01M 2004/028: {Positive 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 - C01B: NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; {METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C} - C09C: TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES (treatment of materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone C04B14/00, C04B18/00, C04B20/00); PREPARATION OF CARBON BLACK {; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS} - H01B: CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES (selection for magnetic properties H01F1/00; waveguides H01P {; printed circuits H05K}) - C01P: INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS - Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION ## Abstract A conductive material dispersion includes a carbon-based conductive material, a main dispersant, an auxiliary dispersant, and a dispersion medium, wherein the main dispersant is a nitrile-based copolymer and the auxiliary dispersant is a copolymer including an oxyalkylene unit and at least one selected from the group consisting of a styrene unit and an alkylene unit. ## Claims ### Claim 1 A conductive material dispersion comprising: a carbon-based conductive material; a dispersant; and a dispersion medium, wherein the dispersant includes a main dispersant and an auxiliary dispersant, wherein: the main dispersant is a nitrile-based copolymer having a α,β-unsaturated nitrile-derived unit and a conjugated diene-derived unit, and the conjugated diene-derived unit is partially or fully hydrogenated; and the auxiliary dispersant is a copolymer including an oxyalkylene unit and at least one of a styrene unit and an alkylene unit. ### Claim 2 (depends on 1) The conductive material dispersion of claim 1, wherein the nitrile-based copolymer includes the α,β-unsaturated nitrile-derived unit: the conjugated diene-derived unit at a weight ratio of 10 to 50:50 to 90. ### Claim 3 (depends on 1) The conductive material dispersion of any one of claim 1, wherein the nitrile-based copolymer includes a repeating unit represented by [Formula 1] below and a repeating unit represented by [Formula 2] below: ### Claim 4 (depends on 3) The conductive material dispersion of claim 3, wherein the content of the repeating unit represented by [Formula 1] is 10 to 50 wt % and the content of the repeating unit represented by [Formula 2] is 50 to 90 wt %. ### Claim 5 (depends on 1) The conductive material dispersion of claim 1, wherein the nitrile-based copolymer has a hydrogenation rate of the conjugated diene-derived unit of 80% or greater. ### Claim 6 (depends on 1) The conductive material dispersion of claim 1, wherein the main dispersant is a nitrile-based copolymer having a weight average molecular weight of 20,000 to 300,000 g/mol. ### Claim 7 (depends on 1) The conductive material dispersion of claim 1, wherein the auxiliary dispersant comprises an oxyalkylene unit in an amount of 9 wt % to 85 wt %. ### Claim 8 (depends on 1) The conductive material dispersion of claim 1, wherein the auxiliary dispersant is a copolymer having a weight average molecular weight of 800 to 30,000 g/mol. ### Claim 9 (depends on 1) The conductive material dispersion of claim 1, wherein the main dispersant and the auxiliary dispersant are included at a weight ratio of 30:70 to 90:10. ### Claim 10 (depends on 1) The conductive material dispersion of claim 1, wherein the carbon-based conductive material is a carbon nanotube having a BET specific surface area of 100 to 1000 m2/g. ### Claim 11 (depends on 1) The conductive material dispersion of claim 1, wherein the carbon-based conductive material is carbon black having a BET specific surface area of 30 to 1000. ### Claim 12 (depends on 1) The conductive material dispersion of claim 1, wherein the dispersion medium is an organic solvent including one or more hetero atoms selected from the group consisting of a nitrogen atom and an oxygen atom. ### Claim 13 (depends on 1) The conductive material dispersion of claim 1, wherein: the main dispersant is a nitrile-based copolymer having a weight average molecular weight of 10,000 to 100,000 g/mol; the auxiliary dispersant is a copolymer including an the oxyalkylene unit, the styrene unit, and the alkylene unit; and the carbon-based conductive material is a carbon nanonube having a BET specific surface area of 100 to 1000 m2/g. ### Claim 14 (depends on 1) An electrode comprising an electrode active material layer formed of an electrode slurry composition containing an electrode active material, the conductive material dispersion of claim 1, a binder, and a solvent. ### Claim 15 (depends on 14) The electrode of claim 14, wherein the electrode is a positive electrode. ### Claim 16 (depends on 14) A lithium secondary battery comprising a positive electrode, a negative electrode, a separator interposed between the positive electrode and the negative electrode, and an electrolyte, wherein the positive electrode is the electrode of claim 14. ### Claim 17 A conductive material dispersion comprising: a carbon-based conductive material; a dispersant; and a dispersion medium, wherein the dispersant includes a main dispersant and an auxiliary dispersant, wherein: the main dispersant is a nitrile-based copolymer having a α,β-unsaturated nitrile-derived unit and a conjugated diene-derived unit; and the auxiliary dispersant is a copolymer including an oxyalkylene unit and at least one of a styrene unit and an alkylene unit, wherein the conductive material dispersion satisfies Equation (1) below when the content of the main dispersant is W1 (wt %), the content of the auxiliary dispersant is W2 (wt %), the content of the carbon-based conductive material is W3 (wt %), and the BET specific surface area value of the conductive material is A (m2/g) in the conductive material dispersion: Equation (1): 0.07 A≤{(W1+W2)/W3}×100≤0.3 A.