Patent ID: 8404383

Claim:
A negative electrode material for a nonaqueous secondary battery, comprising: as the main component, graphite particles having a median diameter of from 5 μm to 40 μm in the volume-basis particle size distribution based on the laser diffraction/scattering particle size distribution measurement; a tapping density of 0.7 g/cm 3 or more; a specific surface area measured by a BET method of from 0.2 m 2 /g, to 8 m 2 /g; an average circularity of the graphite particles of from 0.83 to 1.00; and when an electrode is produced by a method for manufacturing an electrode and the resulting electrode is subjected to X-ray diffraction, the graphite crystal orientation ratio I 110 /I 004 on the electrode is 0.08 or more, where I 110 represents the wide angle X-ray diffraction peak area of the (110) peak in the region of 2θ=76.5 to 78.5 degrees of the graphite particles on the electrode and I 004 represents the wide angle X-ray diffraction peak area of the (004) peak in the region of 2θ=53.5 to 56 degrees, said method for manufacturing an electrode comprising: adding 1 part by weight of aqueous dispersion of styrene-butadiene rubber in terms of solid content and 1 part by weight of carboxymethyl cellulose having a molecular weight of from 250,000 to 300,000 present in an aqueous solution in terms of solid content to 100 parts by weight of the negative electrode material to form a slurry, applying said slurry to a current collector formed from copper foil having a thickness of 18 μm by using a doctor blade in such a way that 10±0.1 mg/cm 2 of the negative electrode material in terms of weight after drying is adhered, followed by drying, and pressing once with a roll press while a press load is adjusted in such a way that the electrode density, exclusive of the copper foil, becomes 1.63±0.03 g/cm 3 .