METHOD FOR PRODUCING HARDLY-GRAPHITIZABLE CARBON MATERIAL, HARDLY-GRAPHITIZABLE CARBON MATERIAL, NEGATIVE ELECTRODE MATERIAL FOR LITHIUM ION SECONDARY BATTERIES, AND LITHIUM ION SECONDARY BATTERY

Provided is a method for producing a non-graphitizable carbon material, the method including a step in which a raw material of the non-graphitizable carbon material is subjected to a cross-linking treatment to obtain a cross-linked product; a step in which the cross-linked product is subjected to an infusibility-imparting treatment to obtain an infusibility-imparted product; a step in which the infusibility-imparted product is subjected to a pulverizing treatment; and a step in which the infusibility-imparted product that has been subjected to the pulverizing treatment is fired at 900°C to 1300°C to obtain the non-graphitizable carbon material.