Lithium secondary battery positive electrode and lithium secondary battery

A lithium secondary battery comprising a positive electrode, a negative electrode, a separator and a non-aqueous electrolyte,

• wherein the positive electrode, the negative electrode and the separator form a wound electrode assembly,
• the positive electrode comprises a positive electrode material mixture layer containing a positive electrode active material, a conductivity enhancing agent and a binder on one or both sides of a current collector,
• the positive electrode active material contains a lithium-containing composite oxide represented by the general compositional formula:
• Li1+xMO2,
• where x is in a range of −0.15≦x≦0.15 and M represents an element group of three or more elements including at least Ni, Co and Mn,
• the ratios of Ni, Co and Mn to the total elements constituting M satisfy 50≦a≦90, 5≦b≦30, 5≦c≦30, and 10≦b+c≦50 where the ratios of Ni, Co and Mn are represented by a, b and c, respectively, in units of mol %,
• the binder contains a tetrafluoroethylene-vinylidene fluoride copolymer and polyvinylidene fluoride,
• the total content of the binder in the positive electrode material mixture layer is 1 to 4 mass %, and
• the ratio of the tetrafluoroethylene-vinylidene fluoride copolymer is 10 mass % or more, when the total of the tetrafluoroethylene-vinylidene fluoride copolymer and the polyvinylidene fluoride is taken as 100 mass %.