NON-AQUEOUS ELECTROLYTE SECONDARY BATTERY

Abstract

A secondary battery comprises: an electrode body obtained by winding a negative electrode in which a negative electrode mixture layer is formed on a negative electrode core body and a positive electrode. The secondary battery is characterized in that: the negative electrode has, at the winding direction inner-end side of the electrode body, a non-facing part which does not face the positive electrode with the separator therebetween; the non-facing part has a mixture non-facing part in which the negative electrode mixture layer is formed on at least one surface of the negative electrode core body, from the winding direction outer end of the non-facing part and toward the winding direction inner side; and the average value of a mixture surface distance which is between the mixture non-facing part and the negative electrode positioned one turn outward of the mixture non-facing part is not less than 90 μm.

CPC Classifications