| abstract |
A nonaqueous electrolyte secondary battery having a flat wound electrode body, a high capacity and good charge / discharge cycle characteristics and productivity, and a positive electrode capable of constituting the nonaqueous electrolyte secondary battery. A positive electrode for use in a non-aqueous electrolyte secondary battery having a wound electrode body in which a positive electrode, a negative electrode and a separator are wound in a spiral shape so as to have a flat cross section and whose upper limit voltage of charging is set to not less than 4.3 V, And a positive electrode mixture layer containing positive electrode active material, a conductive auxiliary agent and a binder formed on both sides of the current collector, wherein the current collector has a thickness of 11 μm or less and a tensile strength of 2.5 N / mm or more , And the positive electrode material mixture layer comprises a positive electrode for a nonaqueous electrolyte secondary battery containing a vinylidene fluoride-chlorotrifluoroethylene copolymer as the binder, a flat wound electrode body having the positive electrode, and a nonaqueous electrolyte , And the upper limit voltage of charging is set to 4.3 V or higher. |