NON-AQUEOUS ELECTROLYTIC SECONDARY BATTERY

The purpose of the present invention is to provide a non-aqueous electrolytic secondary battery in which electrical connection between an exposed surface of a negative current collector at the outermost periphery of an electrode assembly and the inner surface of an outer can is ensured. A non-aqueous electrolytic secondary battery according to an embodiment of the present disclosure is provided with a wound electrode assembly. A negative electrode (12) comprises a sheet-like negative current collector (40) having a negative electrode mixture layer (42) formed on a surface thereof, and includes a double-side coating portion in which the negative electrode mixture layer (42) is formed on both sides of the negative current collector (40), and a single-side coating portion in which the negative electrode mixture layer (42B) is formed on one side of the negative current collector. At least a part of the single-side coating portion is disposed at the outermost periphery of the electrode assembly. At least a part of an exposed surface of the negative current collector in the single-side coating portion is in contact with the inner surface of an outer can. The charge expansion ratio of the negative electrode mixture layer (42B) in the single-side coating portion is greater than the charge expansion ratio of the negative electrode mixture layer (42A) in the double-side coating portion.