NOVELTY - Lithium secondary battery for vehicles comprises positive electrode made of material comprising secondary particles (2) made up of primary particles (1) of lithium-transition metal composite oxide and comprising voids (5). The secondary particles are composed of a network of crystalline sintered primary particles which are in contact with each other. The voidage of secondary particles is 2.5-35% of sectional area of the particles, and secondary particles contain lithium-nickel-manganese-cobalt oxide. The crystal orientations of c-axes of greater than or equal to 60% of primary particles are within 20 degrees .    USE - As lithium secondary battery for vehicles (claimed), particularly electric vehicles and hybrid vehicles such as automobiles.    ADVANTAGE - In the lithium batteries using the positive electrode material, discharge rate characteristic and the battery capacity in a low temperature environment such as of -30 degrees C are hardly deteriorated and are excellent in the cycle characteristic. The lithium secondary battery has a rechargeable capacity of greater than or equal to 10 mAh/g at 3.0V and at -30 degrees C.    DETAILED DESCRIPTION - Lithium secondary battery for vehicles comprises a positive electrode made of a positive electrode material comprising secondary particles (2) made up of primary particles (1) of a lithium-transition metal composite oxide and comprising voids (5); a negative electrode; and a non-aqueous electrolyte. The secondary particles are composed of a network of crystalline sintered primary particles which are in contact with each other. The voidage defined as the cross-sectional area of the voids between the primary particles of a secondary particle in a central cross-section of the secondary particle is 2.5-35%. The crystal orientations of the c-axes of greater than or equal to 60% of the primary particles of a secondary particle are within a range of 20 degrees , and the secondary particles are composed of crystals having a layered crystal structure and have a composition of LiaNixMnyCozO2 (where a=1-1.2, x=0.33-0.5, y=0-0.65, z=0-0.65 and x+y+z=1). The positive electrode material is made by sintering a powder composition comprising compounds of lithium (Li), nickel (Ni), manganese (Mn) and cobalt (Co) at 950-1100 degrees C and grinding the product to a powder.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic drawing showing a positive electrode material having the layered crystal structure.    Primary particles (1)    Secondary particles (2)    Primary particle diameter (3)    Secondary particle diameter (4)    Voids (5)