Patent ID: 9059467
Filing Date: 2015-06-16
Classification: C01B,H01M,Y02E

Abstract:
1. A method of producing a graphite material for an electrode material for a lithium ion battery, the method including carrying out a graphitizing step in a rectangular parallelepiped furnace body made of ceramic bricks and having an opening in an upper portion thereof, said graphitizing step comprising directly applying an electric current through a carbon material to cause the material to generate heat, in which the carbon material before graphitization has a compact powder resistivity of 0.3 Ω·cm or less when compressed to a density of 1.4 g/cm 3 , has an angle of repose of 20° or more and 50° or less, and has a particle size D90 of 120 μm or less in a volume-based particle size distribution measured by a laser diffraction method, and the carbon material after graphitization has an average interplanar spacing d002 of a (002) plane measured by an X-ray diffraction method of 0.3354 nm or more and 0.3450 nm or less, and the carbon material before graphitization is obtained by subjecting an organic carbon raw material to heat treatment at 800° C. or more and 1,500° C. or less followed by pulverization, in which a sulfur content in the organic carbon raw material is 2 mass % or less.