NON-AQUEOUS ELECTROLYTE SECONDARY BATTERY

The purpose of the present invention is to improve cycle characteristics while maintaining high capacity in a non-aqueous electrolyte secondary battery having a wound electrode assembly. In an embodiment, the non-aqueous electrolyte secondary battery is provided with a wound electrode assembly in which a positive electrode and a negative electrode are wound with a separator therebetween, wherein the negative electrode has a negative electrode current collector, a first negative electrode composite layer formed on a first surface of the negative electrode current collector facing the outside of the electrode assembly, and a second negative electrode composite layer formed on a second surface of the negative electrode current collector facing the inside of the electrode. The first negative electrode composite layer contains a cellulosic binder and a rubber binder. The first negative electrode composite layer has a greater content of the cellulosic binder toward the surface of the composite layer than toward the negative electrode current collector in the thickness direction of the first negative electrode composite layer while having a greater content of the rubber binder toward the negative electrode current collector than toward the surface of the composite layer in the thickness direction of the first negative electrode composite layer.