NONAQUEOUS ELECTROLYTE SECONDARY BATTERY

摘要

PROBLEM TO BE SOLVED: To provide a nonaqueous electrolyte secondary battery excellent in resistance characteristics in an electrode and output characteristics in a battery.SOLUTION: A nonaqueous electrolyte secondary battery of the present invention includes: a positive electrode having a positive electrode active material capable of adsorbing/desorbing alkali metal ions; a negative electrode having a negative electrode active material; and an electrolyte. In the nonaqueous electrolyte secondary battery, at least one of the positive electrode and the negative electrode contains an electroconductive polymer having a three dimensional structure in which a fiber shape or a portion of the fiber shape is made as a basic part, the fiber shape having an outer diameter on a cross section perpendicular to an extending direction thereof of 100 nm or less and an aspect ratio of 10 or more.