Kabushiki Kaisha Toshiba

Toshiba Battery Co., Ltd.

Koji Ishiwa

Yuji Sato

Hiroyuki Takahashi

Kazuhiro Yoshida

Hiroyuki Hasebe

Hirotaka Hayashida

Kazuta Takeno

Kiyoshi Mitsuyasu

Kunihiko Sasaki

Katuyuki Hata

Ichirou Sawatari

A nickel-metal hydride secondary cell comprising a non-sinter type nickel positive electrode accommodated in an enclosure and comprised of a conductive core and a layer formed on the conductive core, the layer made of a mixture of nickel hydroxide power and cobalt monoxide powder covered with a layer of high-valence cobalt oxide, a hydrogen absorbing alloy negative electrode accommodated in the enclosure and comprised of a conductive core and a layer formed on the conductive core and made of a mixture hydrogen absorbing alloy powder and carbon black having a specific surface area of 700 m.sup.2 /g or more, and having a capacity 1.0 to 2.5 times the sum of the capacity of the nickel hydroxide contained in the positive electrode and the electricity required to oxidize the cobalt monoxide powder, a separator made of synthetic resin unwoven fabric having a texture size of 50 to 100 g/m.sup.2 and a thickness of 0.1 to 0.25 mm, and located between the positive electrode and the negative electrode, and alkali electrolyte contained in the enclosure.

Nickel-metal hydride secondary cell

Growing community of inventors

Yokohama, Japan

Koji Ishiwa