Abstract: A non-aqueous electrolyte secondary battery according to one aspect of the present invention includes: a positive electrode plate in which a positive electrode mixture layer containing a positive electrode active material is formed on a positive electrode current collector; a negative electrode plate in which a negative electrode mixture layer containing a negative electrode active material is formed on a negative electrode current collector; a separator; a non-aqueous electrolyte; a sealing member; and an outer casing. The negative electrode active material contains graphite and a silicon material. The silicon material contains silicon oxide represented by SiOx (0.5?x<1.6) and a silicon-lithium silicate composite in which a silicon phase is dispersed in a lithium silicate phase represented by Li2zSiO(2+z) (0<z<2). The amount of the silicon-lithium silicate composite is 33% by mass or more and 93% by mass or less relative to the silicon material.

Abstract: A non-aqueous electrolyte secondary battery which is an example of an embodiment of the present invention includes an electrode body around which a positive electrode and a negative electrode are spirally wound via a separator, a non-aqueous electrolyte, and a bottomed cylindrical outer can that accommodates the electrode body and the non-aqueous electrolyte. The negative electrode has a negative electrode core and a negative electrode mixture layer that is provided on the surface of the negative electrode core. The electrode body has, on the outer peripheral surface, an exposed portion where the surface of the negative electrode core is exposed, and the exposed portion is in contact with the inner surface of the outer can. The non-aqueous electrolyte comprises 0.1 to 1.0 mass % of a diisocyanate compound.

Abstract: A non-aqueous electrolyte secondary battery according to one aspect of the present invention includes: a positive electrode plate in which a positive electrode mixture layer containing a positive electrode active material is formed on a positive electrode current collector; a negative electrode plate in which a negative electrode mixture layer containing a negative electrode active material is formed on a negative electrode current collector; a separator; a non-aqueous electrolyte; a sealing member; and an outer casing. The negative electrode active material contains graphite and a silicon material. The silicon material contains silicon oxide represented by SiOx (0.5?x<1.6) and a silicon-lithium silicate composite in which a silicon phase is dispersed in a lithium silicate phase represented by Li2zSiO(2+z) (0<z<2). The amount of the silicon-lithium silicate composite is 33% by mass or more and 93% by mass or less relative to the silicon material.