Panasonic Holdings Corporation

Panasonic Energy Co., Ltd.

Tsukasa Gejo

Junichi Sugaya

Takuya Shinomiya

Takamitsu Tashita

Fumikazu Mizukoshi

A non-aqueous electrolyte secondary cell comprising a negative electrode () having a negative electrode collector () and a negative electrode active material layer () provided on the negative electrode collector (). The negative electrode active material layer () contains graphite particles A and graphite particles B as negative electrode active materials. The graphite particles A have an internal void rate of 5% or less. The graphite particles B have an internal void rate of 8 to 20%. When the negative electrode active material layeris halved in the thickness direction, a regionon the half closer to the outer surface contains more graphite particles A than a regionon the half closer to the negative electrode collector.

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Osaka, Japan

Tsukasa Gejo