Kabushiki Kaisha Toshiba

Toshiba Battery Co., Ltd.

Kunihiko Sasaki

Nobukazu Suzuki

Masao Yamamoto

Shuji Yamada

Motoya Kanda

Ken Uchida

Hirokazu Niki

Akinori Hongu

Shinji Tsuruta

Yuu Kondou

Yoshiko Kanazawa

Koji Hashimoto

Yuji Sato

Hiroyuki Takahashi

Kazuhiro Yoshida

Hiroyuki Hasebe

Hirotaka Hayashida

Masaru Hayashi

Kazuta Takeno

Kiyoshi Mitsuyasu

Fuminobu Tezuka

Katuyuki Hata

Yuki Tomioka

Ichirou Sawatari

Tetsuya Tachibe

Koji Ishiwa

Koji Hasimoto

Disclosed is a method of reclaiming a cathodic active material of lithium ion secondary batteries. The lithium ion secondary battery is broken and the casing and the content are separated to remove the casing from the content. The content is dissolved into a mineral acid to separate remaining non-dissolved content from the mineral acid to obtain a liquid containing the cathodic active material represented by the formula: LiMO,, where M is a transition metal element: cobalt, nickel and manganese. A lithium salt is added to the liquid, and the cathodic active material is recovered from the liquid in the form of a mixture of lithium compound and the transition metal compound, which is calcined and reclaimed into the cathodic active material.

Method of reclaiming cathodic active material of lithium ion secondary battery

In a fuel cell comprising a stack having superposed a plurality of electromotive parts composed of a fuel electrode, an oxidizing electrode, and an electrolyte layer nipped by the two electrodes and using a liquid fuel as the fuel for the fuel cell, this invention contemplates forming a liquid fuel introducing path destined to be directly exposed to the liquid fuel on terminal surfaces of the component parts of the electromotive parts in a direction perpendicular to the flow of an oxidizing gas along at least one of the outer peripheral surfaces of the stack including the terminal surface of the fuel electrode and lying parallelly to the flow of the oxidizing gas and enabling the liquid fuel in the liquid fuel introducing path to be supplied to the fuel electrodes by a capillary attraction. A fuel cell provided with means for recovery of the water produced by the cell reaction in the oxidizing electrodes is also disclosed, which fuel cell effects the removal of the water produced in the oxidizing electrodes during the operation of the fuel cell by a capillary attraction generated by two porous members, i.e. a first porous member disposed in the oxidizing electrodes and a second porous member adjoined to the first porous member and possessed of a smaller average pore diameter than the first porous member.

Fuel cell

In a fuel cell comprising a stack having superposed a plurality of electromotive parts composed of a fuel electrode, an oxidizing electrode, and an electrolyte layer nipped by the two electrodes and using a liquid fuel as the fuel for the fuel cell, this invention contemplates forming a liquid fuel introducing path destined to be directly exposed to the liquid fuel on terminal surfaces of the component parts of the electromotive parts in a direction perpendicular to the flow of an oxidizing gas along at least one of the outer peripheral surfaces of the stack including the terminal surface of the fuel electrode and lying parallelly to the flow of the oxidizing gas and enabling the liquid fuel in the liquid fuel introducing path to be supplied to the fuel electrodes by a capillary attraction. A fuel cell provided with means for recovery of the water produced by the cell reaction in the oxidizing electrodes is also disclosed, which fuel cell effects the removal of the water produced in the oxidizing electrodes during the operation of the fuel cell by a capillary attraction generated by two porous members.

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

Kawasaki, Japan

Kunihiko Sasaki