CARBON POWDER HAVING HIGH PACKING PROPERTY FOR ELECTRODE PLATE OF NONAQUEOUS ELECTROLYTE SECONDARY BATTERY

摘要

PROBLEM TO BE SOLVED: To provide a method for manufacturing a carbon powder having high packing property for an electrode plate of a nonaqueous electrolyte secondary battery.

SOLUTION: The carbon powder having high packing property for an electrode plate of a nonaqueous electrolyte secondary battery is manufactured through a process of imparting high packing property to a carbonaceous powder by adding dynamic energy to the carbonaceous powder to obtain spherical powder particles having 1.1 or more ratio of apparent densities before and after the process and 1 or less ratio of median diameters before and after the process. It is preferable that the 15 μm-limited average circularity of the carbon powder having high packing property after the process is 0.850 or more; the carbonaceous powder before the process has an interlayer distance (d002) of 0.345 nm or less and a crystallite size (Lc) of 10 nm or more; and the carbon powder having high packing property has a median diameter of 5 to 50 μm and a BET specific surface area of 25 m2/g or less. Another carbon powder having high packing property is obtained by mixing the above carbon powder having high packing property with an organic compound and then carbonizing the organic compound to obtain a multilayer structural carbon material.

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