Patent ID: 7563539

Claim:
A non-aqueous electrolyte secondary battery comprising: (a) a positive electrode comprising: (i) a positive electrode collector; and (ii) an electrode active material layer comprising a positive electrode material; (b) a negative electrode; (c) a film-state case housing the positive electrode and the negative electrode, the film-state case comprising a laminated film obtained by coating a metal foil coated with a resin, a polymer film, or a metal film, and (d) an electrolyte, wherein the electrolyte comprises a lithium salt, a solvent and one or more polymer compounds selected from the group consisting of ether-based polymers, wherein, (i) said positive electrode material comprises particles, (ii) said particles consisting essentially of a compound of formula LiMO 2 or LiMn 2 O 4 , wherein M comprises at least one material selected from the group consisting of Co, Ni, and Mn; and (iii) the average particle diameter of said particles is at least 10 μm to at most 22 μm.