NOVELTY - The method comprises: placing a carbonaceous material within a container; rotating the container using a motor at a speed of 500-3000 revolutions per minute; and cutting the carbonaceous material by a milling cutter having a blade to form a carbon powder, where the carbon bonds of carbonaceous material have uniform and different structure. The cutter blade is double or triple batch blade. The container comprises an inert atmosphere. The carbonaceous material having a particle size of greater then 20 mu m is injected into the container.    USE - The method is useful for preparing a carbon powder for an energy storage device (claimed) such as a supercapacitor and a lithium ion battery, which is useful in an uninterruptible power supply system and a hybrid electric vehicle.    ADVANTAGE - The method is capable of preparing the carbon powder with improved durability and stability thus improving energy density, output characteristics and charge/discharge characteristics of the battery.    DETAILED DESCRIPTION - The method comprises: placing a carbonaceous material within a container; rotating the container using a motor at a speed of 500-3000 revolutions per minute; and cutting the carbonaceous material by a milling cutter having a blade to form a carbon powder, where the carbon bonds of carbonaceous material have uniform and different structure. The cutter blade is double or triple batch blade. The container comprises an inert atmosphere. The carbonaceous material having a particle size of greater then 20 mu m is injected into the container, where the volume of the carbon material injected into the container is less than 20%. The method further comprises adjusting the milling cutter within 3 hours after finishing the first stage of cutting. The carbon powder has: a particle size of 1-10 mu m; an interlayer spacing (d002) of less than 3.5 Angstrom ; a specific surface area of less than 25 m2/g; an aspect ratio of less than 1.5; and a spherical shape. An INDEPENDENT CLAIM is included for a carbon powder.