Non-aqueous electrolyte secondary battery

Provided is a non-aqueous electrolyte secondary battery (1) equipped with; a cathode (4) containing a cathode active material layer (4a); an anode (5) containing an anode active material layer (5a); and a non-aqueous electrolyte. The cathode active material layer (4a) and/or the anode active material layer (5a) contains carbon dioxide, and when heated for one minute at 350 DEG C, releases 0.1-10 ml inclusive of carbon dioxide for every 1 g thereof.