METHOD FOR MANUFACTURING NEGATIVE ELECTRODE MATERIAL FOR LITHIUM-ION SECONDARY BATTERY, AND METHOD FOR MANUFACTURING LITHIUM-ION SECONDARY BATTERY
A method of manufacturing a negative electrode for a lithium-ion secondary battery, the method comprising: (a) a process of obtaining a mixture that comprises a graphitizable binder and at least one selected from the group consisting of a graphitizable aggregate and graphite; (b) a process of obtaining a molded product by molding the mixture, in which the graphitizable binder is in a softened state; (c) a process of obtaining a graphitized product by graphitizing the molded product; and (d) a process of obtaining a pulverized product by pulverizing the graphitized product.
1 . A method of manufacturing a negative electrode for a lithium-ion secondary battery, the method comprising:
(a) a process of obtaining a mixture that comprises a graphitizable binder and at least one selected from the group consisting of a graphitizable aggregate and graphite;
(b) a process of obtaining a molded product by molding the mixture, in which the graphitizable binder is in a softened state;
(c) a process of obtaining a graphitized product by graphitizing the molded product; and
(d) a process of obtaining a pulverized product by pulverizing the graphitized product.
2 . The method of manufacturing a negative electrode for a lithium-ion secondary battery according to claim 1 , wherein the process of obtaining a molded product is performed in a state in which the mixture has a temperature of 80° C. or more.
3 . The method of manufacturing a negative electrode for a lithium-ion secondary battery according to claim 1 , wherein the process of obtaining a molded product is performed by extrusion molding.
4 . The method of manufacturing a negative electrode for a lithium-ion secondary battery according to claim 1 , wherein the mixture further comprises a fluidity-imparting agent.
5 . The method of manufacturing a negative electrode for a lithium-ion secondary battery according to claim 4 , wherein the fluidity-imparting agent comprises a fatty acid.
6 . The method of manufacturing a negative electrode for a lithium-ion secondary battery according to claim 1 , wherein the pulverized product comprises a particle in which plural flat graphite particles are aggregated or bonded such that principal surfaces of the graphite particles are not parallel to each other.
7 . A method of manufacturing a lithium-ion secondary battery, the method comprising a process of manufacturing a negative electrode using a negative electrode material that is manufactured by the method of manufacturing a negative electrode for a lithium-ion secondary battery according to claim 1 .
8 . A method of manufacturing a lithium-ion secondary battery, the method comprising: a process of manufacturing a negative electrode material for a lithium-ion secondary battery by the method of manufacturing a negative electrode for a lithium-ion secondary battery according to claim 1 ; and a process of manufacturing a negative electrode using the negative electrode material for a lithium-ion secondary battery.