Patent ID: 7223495

Claim:
A non-aqueous electrolyte secondary battery comprising: (a) a positive electrode comprising a positive electrode active material layer, said positive electrode active material layer comprising a positive electrode material; (b) a negative electrode comprising a negative electrode active material and (c) a film-state case as a packaging member, (d) an electrolyte, wherein, (i) said positive electrode active material comprises at most 0.15% by weight of one or more carbonate compounds; (ii) the amount of water contained in said positive electrode active material is at most equal to 300 ppm (iii) said electrolyte comprises a lithium salt, a solvent, and one or more polymers selected from the group consisting of ether-based polymers, poly(methacrylate) ester polymers, acrylate polymers, and fluorine-containing polymers.