METHOD OF MANUFACTURING ANODE MATERIAL FOR LITHIUM-ION SECONDARY BATTERY, AND METHOD OF MANUFACTURING LITHIUM-ION SECONDARY BATTERY
A method of manufacturing an anode material for a lithium-ion secondary battery includes (a) a step of obtaining a mixture containing a graphitizable aggregate, a graphitizable binder, and an aromatic compound; (b) a step of obtaining a molded product with a density of 1.3 g/cm 3 or less by molding the mixture; (c) a step of obtaining a graphitized product by graphitizing the molded product; and (d) a step of obtaining a ground product by grinding the graphitized product.
1 . A method of manufacturing an anode material for a lithium-ion secondary battery, the method comprising:
(a) obtaining a mixture containing a graphitizable aggregate, a graphitizable binder, and an aromatic compound;
(b) obtaining a molded product with a density of 1.3 g/cm 3 or less by molding the mixture;
(c) obtaining a graphitized product by graphitizing the molded product; and
(d) obtaining a ground product by grinding the graphitized product.
2 . The method of manufacturing an anode material for a lithium-ion secondary battery according to claim 1 , wherein the aromatic compound includes one compound selected by the group consisting of naphthalene, methylnaphthalene, acenaphthene, biphenyl, fluorene, benzopyrene, benzanthracene, dibenzanthracene, diphenylene oxide, quinoline and isoquinoline.
3 . The method of manufacturing an anode material for a lithium-ion secondary battery according to claim 1 , wherein a content of the aromatic compound in the mixture is from 1% by mass to 20% by mass with respect to a total of 100% by mass of the aggregate and the binder.
4 . The method of manufacturing an anode material for a lithium-ion secondary battery according to claim 1 , wherein a content of the binder in the mixture is 25% by mass or less with respect to a total of 100% by mass of the aggregate and the binder.
5 . The method of manufacturing an anode material for a lithium-ion secondary battery according to claim 1 , wherein a content of the binder in the mixture is 15% by mass or less with respect to a total of 100% by mass of the aggregate and the binder.
6 . The method of manufacturing an anode material for a lithium-ion secondary battery according to claim 1 , wherein a content of the aromatic compound in the mixture is from 1.5% by mass to 20% by mass with respect to a total of 100% by mass of the aggregate and the binder.
7 . The method of manufacturing an anode material for a lithium-ion secondary battery according to claim 1 , wherein a specific surface area of the ground product that is an anode material for a lithium-ion secondary battery is 2.8 m 2 /g or less.
8 . A method of manufacturing a lithium-ion secondary battery, the method comprising producing an anode by using an anode material obtained by the method of manufacturing an anode material for a lithium-ion secondary battery according to claim 1 .
9 . A method of manufacturing a lithium-ion secondary battery, the method comprising: manufacturing an anode material by the method of manufacturing an anode material for a lithium-ion secondary battery according to claim 1 ; and producing an anode by using the anode material for a lithium-ion secondary battery.