| abstract |
At least one of hydroxides, oxides, and carbonates of at least one metal selected from the group of transition metals, IIA metals, and IIIA metals, which is an active material of a positive electrode which is laminated via a negative electrode and a separator, and wound in a wound shape to form a pole plate group. Species, lithium compounds containing 50 to 50 μm of D 50 , 90 μm or less of D 90 , and 100 μm or more of particle diameter to each other are mixed and calcined at 700 to 1000 ° C. for 2 to 30 hours to use a lithium composite metal oxide. . By using the positive electrode active material thus produced, the discharge capacity and cycle characteristics of the nonaqueous electrolyte secondary battery can be improved. |