NOVELTY - A lithium secondary battery (100) consists of positive electrode (30) having a positive electrode active material layer (34), and negative electrode (40) having negative electrode active material layer (44) containing negative electrode active material. The positive electrode active material comprises lithium complex oxide containing lithium, and nickel and/or cobalt. The ratio of volume of voids per unit area in positive electrode active material layer (Sa) and volume of voids per unit area in negative electrode active material layer (Sb) is 0.9-1.4.    USE - Lithium secondary battery for vehicle (claimed) e.g. motor vehicle, hybrid vehicle and electric vehicle, and power supply of personal computer.    ADVANTAGE - The lithium secondary battery has excellent low temperature charging/discharging characteristics and low internal resistance.    DETAILED DESCRIPTION - A lithium secondary battery consists of positive electrode having a positive electrode active material layer containing positive electrode active material formed in the surface of positive electrode collector (32), and negative electrode having negative electrode active material layer containing negative electrode active material formed in the surface of negative electrode collector (42). The positive electrode active material comprises lithium complex oxide containing lithium, and nickel and/or cobalt. The porosity of the positive electrode active material layer is 30-40%, and the porosity of the negative electrode active material layer is 30-45%. The ratio (Sa/Sb) of the volume of voids per unit area in the positive electrode active material layer (Sa) and the volume of voids per unit area in the negative electrode active material layer (Sb) is 0.9-1.4. An INDEPENDENT CLAIM is included for manufacture of the lithium secondary battery.    DESCRIPTION OF DRAWING(S) - The drawing shows the sectional view of the lithium secondary battery.    Positive electrode (30)    Positive electrode collector (32)    Positive electrode active material layer (34)    Negative electrode (40)    Negative electrode collector (42)    Negative electrode active material layer (44)    Lithium secondary battery (100)