Patent ID: 9088035
Filing Date: 2015-07-21
Classification: H01M,Y02E,Y02P

Abstract:
1. A non-aqueous electrolyte secondary battery comprising: a positive electrode comprising a positive electrode substrate and a positive electrode material mixture layer carried on said positive electrode substrate; a negative electrode comprising a negative electrode substrate and a negative electrode material mixture layer carried on said negative electrode substrate; a separator or lithium-ion conductive porous film interposed between said positive electrode and said negative electrode; and a lithium-ion conductive non-aqueous electrolyte, wherein said positive electrode material mixture layer comprises a positive electrode active material comprising a lithium transition metal composite oxide, wherein said lithium transition metal composite oxide is represented by the general formula (I): said general formula (1) satisfies 1.0≦x≦1.03 and 0.051≦y≦0.15, the element M in said general formula (1) is at least two selected from the group consisting of Mg, Al, Sr, Mn and Ca, said negative electrode material mixture layer comprises a negative electrode active material comprising a carbon material that is capable of absorbing and desorbing lithium, the end of charge voltage of said non-aqueous electrolyte secondary battery is set to 4.25 to 4.5 V in normal operation, and the ratio R:Wp/Wn is 1.5 to 2.2 in the area where said positive electrode material mixture layer and said negative electrode material mixture layer are opposed to each other, said Wp being the weight of the positive electrode active material contained in said positive electrode material mixture layer per unit opposed area, said Wn being the weight of the negative electrode active material contained in said negative electrode material mixture layer per unit opposed area.