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 object of the present invention is to provide a carbonaceous material which is obtainable from plant-derived char and has a decreased specific surface area. Further, the object of the present invention is to provide a non-aqueous electrolyte secondary battery having excellent dedoping capacity (discharge capacity), non-dedoping capacity (irreversible capacity), and charge-discharge efficiency.;The object can be solved by a carbonaceous material for non-aqueous electrolyte secondary batteries characterized in that the carbonaceous material is obtained by heat-treating plant-derived char which is demineralized in gas-phase, and carbon precursor (i.e. non-graphitizable carbon precursor, graphitizable carbon, or mixture thereof) or volatile organic compound under a non-oxidizing gas atmosphere; and a specific surface area determined by a BET method is 10 m2/g or less. Further, the object can be solved by a carbonaceous material for non-aqueous electrolyte secondary batteries characterized in that the carbonaceous material is obtained by heating plant-derived char, and hydrocarbon compound having 1 to 20 carbon atoms; and a specific surface area determined by a BET method is 15 m2/g or less.

主权项

1. A carbonaceous material for non-aqueous electrolyte secondary batteries, characterized in that the carbonaceous material is obtained by subjecting 35 weight % or more of a plant-derived char demineralized in a gas-phase, which is obtained by heating plant-derived char having an average particle diameter of 100 to 10000 μm at 500° C. to 1250° C. under an inert gas atmosphere containing a halogen compound and an organic compound having a volatile-element of 10 weight % or more in an ignition treatment at 800° C., to (a) final heat-treatment at 800 to 1600° C. under a non-oxidizing gas atmosphere, or (b) pre-heat-treatment at no less than 350° C. to less than 800° C., and final heat-treatment at 800 to 1600° C. under a non-oxidizing gas atmosphere, and the carbonaceous material has a specific surface area determined by a BET method of 10 m2/g or less.