Patent ID: 7718318

Claim:
A method for producing a non-aqueous electrolyte secondary battery comprising the steps of: providing a battery precursor comprising a negative electrode including a substance capable of absorbing and desorbing lithium ion and/or a metal lithium as a negative electrode active material, a positive electrode containing a positive electrode active material comprising a lithium-containing oxide, said lithium-containing oxide being expressed by the formula: Li[Li x (Ni y Mn y C p ) 1-x ]O 2 , where C is at least one element except Ni and Mn, 0.1≦x≦0.3, 0<2y+p≦1, and 0≦p≦⅓, and an electrolyte, and charging said battery precursor to a plateau voltage region greater than 4.3V where said lithium-containing oxide becomes an overcharged state and a crystal state of said lithium-containing oxide changes.