NOVELTY - The cathode active material is obtained by heat processing a compound particles which generate a metallic material, precursor of a carbonaceous substance and a graphite at 800-1300degreesC in an inert atmosphere. The compound particles which generate metallic material are particles chosen from mixed oxide and alumina silica gel of tin protoxide, tin dioxide, silicon monoxide, silicon dioxide, and antimony oxide. The average particle diameter of secondary particles and primary particles of compound particles is 10 microns or less and 500 nm or less respectively.    USE - For non-aqueous secondary battery (claimed) such as lithium secondary battery, nickel-hydrogen battery and nickel-cadmium cell used as power supply for electronic device and electric vehicle.    ADVANTAGE - The cathode material is light weight and has high capacitance and provides non-aqueous secondary battery having small cyclic deterioration.    DETAILED DESCRIPTION - The cathode active material is obtained by heat processing a compound particles which generate a metallic material, precursor of a carbonaceous substance and a graphite at 800-1300degreesC in an inert atmosphere. The compound particles which generate metallic material are particles chosen from mixed oxide and alumina silica gel of tin protoxide, tin dioxide, silicon monoxide, silicon dioxide, and antimony oxide. The average particle diameter of secondary particles and primary particles of compound particles is 10 microns or less and 500 nm or less respectively. The magnitude (Lc) of microcrystal of carbonaceous substance along c axial direction is 100 ~A or less as measured by X-ray wide angle diffraction method of Gakushin-method. The content of metallic material is 23-65 wt.% with respect to 100 wt.% of cathode active material. The compound particles are microdispersed into carbonaceous substance. The compound particles are silicon-monoxide particles. An INDEPENDENT CLAIM is included for manufacture of cathode active material.