CARBON MATERIAL FOR NONAQUEOUS ELECTROLYTE SECONDARY BATTERY AND METHOD FOR MANUFACTURING SAME, AND NEGATIVE ELECTRODE USING CARBON MATERIAL AND NONAQUEOUS ELECTROLYTE SECONDARY BATTERY

摘要

The purpose of the present invention is to provide a carbon material with reduced specific surface area that is acquired from a plant-derived char. Further, the purpose of the present invention is to provide a nonaqueous electrolyte secondary battery using the carbon material, which is excellent in the dedoping capacity (discharge capacity), the non-dedoping capacity (irreversible capacity) and efficiency. The above-mentioned problem may be solved by the carbon material for nonaqueous electrolyte secondary battery, which is acquired by sintering the plant-derived char that was decalcified in gas phase and a carbon precursor (non-graphitizable carbon precursor, graphitizable carbon precursor, or mixture of both) or a volatile organic compound in non-oxidizing gas atmosphere, and heat-treating the plant-derived char that was decalcified in gas phase and a 1- 20C hydrocarbon compound. The carbon material for nonaqueous electrolyte secondary battery is characterized by the BET specific surface area that is 10 m2/g or less, or 15 m2/g or less.