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

摘要

This method for producing a hardly-graphitizable carbon material, wherein particle diameters can be easily controlled, comprises: a step of obtaining a crosslinked product by subjecting a starting material for hardly-graphitizable carbon materials to a crosslinking process; a step of obtaining an infusibilized product by subjecting the crosslinked product to an infusibilization process; a step of subjecting the infusibilized product to a pulverization process; and a step of obtaining a hardly-graphitizable carbon material by firing the pulverized infusibilized product at 900-1,300°C.