NOVELTY - A lithium-phosphorus complex oxide-carbon composite contains aggregate (10) of lithium-phosphorus complex oxide particles (1) (I). The lithium-phosphorus complex oxide particles are aggregated through electroconductive carbon material (5). The aggregate of lithium phosphorus complex oxide-carbon composite has average particle diameter of 1-30 mu m and tap density of 0.8 g/cm3 or more.    USE - Lithium-phosphorus complex oxide-carbon composite is used for positive electrode active material for lithium secondary battery (both claimed). Uses include but are not limited to power supply for notebook personal computer, mobile telephone, video camera, pocket word processor, cordless phone unit, portable compact disc player, radio, liquid crystal television, electric shaver, memory card, video movie, motor vehicle, electric vehicle, game machine and electric tool.    ADVANTAGE - The lithium-phosphorus complex oxide-carbon composite has high electrode density. The lithium secondary battery using lithium-phosphorus complex oxide-carbon composite has excellent cyclic characteristics.    DETAILED DESCRIPTION - A lithium-phosphorus complex oxide-carbon composite contains aggregate of lithium-phosphorus complex oxide particles of formula: LiMPO4 (I). The lithium-phosphorus complex oxide particles are aggregated through electroconductive carbon material. The aggregate of lithium phosphorus complex oxide-carbon composite has average particle diameter of 1-30 mu m and tap density of 0.8 g/cm3 or more.    M=iron, manganese, cobalt, nickel or vanadium.    An INDEPENDENT CLAIM is included for manufacture of lithium-phosphorus complex oxide-carbon composite, which involves mixing lithium source, phosphorus source, metallic element source and electroconductive carbon material source, obtaining raw material mixture (a), press-molding, obtaining press-molded component of raw material mixture, baking at 500-900 degrees C in inert atmosphere, obtaining lithium-phosphorus complex oxide-carbon composite (I), aggregating, granulating and performing mechanochemical process.    DESCRIPTION OF DRAWING(S) - The drawing shows sectional view of lithium-phosphorus complex oxide-carbon composite.    Lithium-phosphorus complex oxide particles (1)    Electroconductive carbon material (5)    Aggregate (10)