Mitsui Minings & Melting Co., Ltd.

Masashi Sakano

Yasuhiro Ochi

Tsuneyoshi Kamada

Hidetoshi Inoue

Naoki Kumada

Hideyuki Nagaoka

A zinc foil is provided that can be used as a negative electrode active material, and in a battery including the zinc foil as a negative electrode active material, the amount of gas generated during long term storage of the battery is reduced as compared with that in a battery including a conventional zinc foil. The zinc foil contains zinc as a main material and bismuth. The bismuth content is 100 ppm or more and 10000 ppm or less on a mass basis. The zinc crystal grain size is 0.2 μm or more and 8 μm or less. The bismuth crystal grain size is less than 1000 nm, as measured in a backscattered electron image obtained using a scanning electron microscope. The zinc foil is free of aluminum and/or lead, or even if the zinc foil contains aluminum and/or lead, the aluminum content is 1% or less on a mass basis and/or the lead content is 200 ppm or less on a mass basis.

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Takehara, Japan

Masashi Sakano