NONAQUEOUS ELECTROLYTE SECONDARY BATTERY

The purpose of the present disclosure is to improve the cycle characteristics of a nonaqueous electrolyte secondary battery which is provided with a wound electrode body that uses an Si-based active material as a negative electrode active material. With respect to a nonaqueous electrolyte secondary battery according to one embodiment of the present invention, a negative electrode comprises: a negative electrode collector; a first negative electrode mixture layer that is formed on a first surface of the negative electrode collector, said first surface facing the outside of the electrode body; and a second negative electrode mixture layer that is formed on a second surface of the negative electrode collector, said second surface facing the inside of the electrode body. The first negative electrode mixture layer contains a Si-based active material. The content ratio of the Si-based active material based on Si in the negative electrode collector side of the first negative electrode mixture layer is lower than that in the surface side of the first negative electrode mixture layer in the thickness direction of the first negative electrode mixture layer.