Abstract: A negative electrode for a non-aqueous electrolyte secondary battery includes a negative electrode current collector, and a negative electrode mixture layer supported on the negative electrode current collector. The negative electrode mixture layer includes a silicon material, a carbon material capable of electrochemically absorbing and releasing lithium ions, and electrically conductive fibers. The silicon material has a lithium-ion conductive phase, and silicon particles dispersed in the lithium-ion conductive phase. When the negative electrode mixture layer is divided into two layers, a first region and a second region, having the same thickness, the first region is nearer to the negative electrode current collector than the second region is, the silicon material is contained more in the second region than in the first region, and the conductive fibers are contained in the second region.

Abstract: This negative electrode for nonaqueous electrolyte secondary batteries is provided with a negative electrode mixture layer that contains a negative electrode active material and carbon nanotubes. The negative electrode active material contains a first negative electrode active material and a second negative electrode active material; the first negative electrode active material and the second negative electrode active material contain lithium silicate phases, each of which contains lithium, silicon and oxygen, and silicon particles that are dispersed in the lithium silicate phases; the molar ratios of oxygen to silicon (O/Si) in the lithium silicate phases are different from each other; the carbon nanotubes have a diameter of from 1 nm to 5 nm; and the ratio of the mass of the first negative electrode active material relative to the total mass of the first negative electrode active material and the second negative electrode active material is 60% or less.

Abstract: A nonaqueous electrolyte secondary battery includes a positive electrode, a negative electrode, and a nonaqueous electrolyte, wherein the negative electrode includes a negative electrode current collector, and a negative electrode active material layer supported by the negative electrode current collector and containing a silicon material as a negative electrode active material; when dividing the negative electrode active material layer into two layers of a first region and a second region having the same thickness, the second region is closer to the negative electrode current collector than the first region; the silicon material is contained in the first region more than the second region; and the nonaqueous electrolyte includes at least one additive selected from the group consisting of a sulfite compound and a sulfate compound.

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 nonaqueous electrolyte secondary battery includes a positive electrode, a negative electrode, and an electrolyte liquid. The negative electrode includes a negative electrode mixture layer containing a first negative electrode active material and a negative electrode collector to which the negative electrode mixture layer is adhered. The first negative electrode active material contains a first lithium silicate phase containing lithium, silicon, and oxygen and first silicon particles dispersed in the first lithium silicate phase. An atomic ratio A1:O/Si of the oxygen to the silicon in the first lithium silicate phase satisfies a relationship of 2<A1?3. At a surface side of the negative electrode, an existence ratio of the first negative electrode active material in the negative electrode mixture layer is high as compared to that at a negative electrode collector side of the negative electrode.