非水電解質二次電池

Abstract

A non-aqueous electrolyte secondary battery (10) includes an electrode body (14) in which a positive electrode (11) and a negative electrode (12) face each other across a separator (13), and a battery case (15) that accommodates the electrode body (14). The positive electrode (11) includes a positive electrode composite material layer containing a binder, and the negative electrode (12) includes a negative electrode composite material layer containing a binder. The non-aqueous electrolyte secondary battery (10) is characterized in that, in a case of use thereof in a fixed state, and the electrode body (14) is equally divided into two of an upper half region and a lower half region with respect to a vertical direction in this fixed state, a swelling degree with an electrolyte is higher for the binder disposed in the upper half region than a swelling degree with the electrolyte for the binder disposed in the lower half region, in at least one of the positive electrode (11) and the negative electrode (12).

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