Prime Planet Energy & Solutions, Inc.

Atsushi Obayashi

Hikaru Yoshida

A non-aqueous electrolyte secondary battery comprises a positive electrode, a negative electrode, a separator, and an electrolyte solution. At least part of the separator is interposed between the positive electrode and the negative electrode. The negative electrode includes a negative electrode substrate and a negative electrode active material layer. The negative electrode active material layer is placed on a surface of the negative electrode substrate. Voids are formed in the negative electrode active material layer. In a cross section parallel to a thickness direction of the negative electrode active material layer, the voids have an average equivalent circle diameter from 9.6 μm to 35.8 μm, an average circularity of 0.26 or more, and an area percentage from 3.1% to 30.9%.

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Sumoto, Japan

Atsushi Obayashi