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Active substance for use in negative electrode of lithium ion secondary battery, and negative electrode of lithium ion secondary battery and lithium ion secondary battery using same

Provided are: an active substance for use in the negative electrode of a lithium ion secondary battery that has a high capacity per unit volume (weight) and that possesses practical characteristics related to the discharge capacity, initial efficiency, input characteristics, capacity retention rate, and the like of a lithium ion secondary battery that make it possible for said active substance to be used in vehicles such as HEVs and PHEVs; and a negative electrode of a lithium ion secondary battery and a lithium ion secondary battery using said active substance. The active substance for use in the negative electrode of a lithium ion secondary battery: is formed from a carbon material having a true specific gravity of 2.00-2.16 g/cm3; has a volume-based particle size distribution that is within a range in which D10 is 3-9 µm, D50 is 10-20 µm, D90 is 21-40 µm, and D90-D10 is 15-35 µm; and has a tap density of 0.8 g/cc or higher. The lithium ion secondary battery comprises: a negative electrode comprising a composite layer formed by mixing the active substance for use in the negative electrode of a lithium ion secondary battery with a binder on a current collector; and a separator via which the negative electrode and a positive electrode are arranged to face each other.
Owner:NIPPON STEEL CHEMICAL CO LTD
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