Yuasa Corporation

Yuasa Battery Co., Ltd.

Masaharu Watada

Masahiko Oshitani

Minoru Kuzuhara

Hiroyuki Mori

Seijiro Ochiai

Toshiki Tanaka

Keiichi Hasegawa

Kengo Furukawa

Masuhiro Ohnishi

Mitsuhiro Kodama

Hiroe Nakagawa

Masaki Miyamoto

Yoshihiro Katayama

Kouichi Sakamoto

Yuichi Matsumura

Masuhiro Onishi

Kaori Syodai

Manabu Kanemoto

Noboru Miyake

For accomplishing the subjects, the invention provides a nickel electrode material for use in a nickel electrode, wherein the positive-electrode material constituting the electrode material comprises: positive active material particles which comprise as the main component either a nickel hydroxide or a solid solution in a nickel hydroxide of one or more other elements and in which part of the nickel hydroxide has been oxidized; and a coating layer formed on the surface of the positive active material particles and comprising as the main component a high-order cobalt compound in which the cobalt has an oxidation number larger than 2, the average oxidation number of the nickel in the positive active material particles and the cobalt in the coating layer being from 2.04 to 2.40, and the positive-electrode material having a tap density of 2.0 g/cmor higher. The invention further provides a process for producing the electrode material, a nickel electrode employing the electrode material, and an alkaline storage battery having the nickel electrode.

Nickel electrode material, and production method therefor, and nickel electrode and alkaline battery

A sealed alkaline storage battery including a nickel electrode as a positive electrode, characterized by having the function of being capable of charge when the gas pressure in the battery and/or the battery temperature is not higher than a specified value and of being incapable of charge when the gas pressure in the battery and/or the battery temperature exceeds the specified value.

Sealed alkaline storage battery, electrode structure and charging method for the same, and charger for sealed alkaline storage battery

Hydrogen absorbing electrode, nickel electrode and alkaline storage

A metal hydride electrode, in which a metallic cobalt powder is mixed, within a mixing range of 3 to 20 weight percents, with a hydrogen absorbing alloy powder formed by substituting a part of Ni of alloy expressed by a rational formula of MmNi.sub.5 with Al and at least one kind of Fe, Cu, Co, Mn, and the mixed powder is loaded in a porous alkaline-proof metal body. An nickel electrode, in which a cobalt monoxide powder is mixed with an active material powder within a mixing range of 5 to 15 weight percents, the active material powder comprising zinc existing within a range of 2 to 8 weight percents, under a solid solution state in a crystal of nickel hydroxide powder assuming a spherical shape including an inner pore volume of 0.14 ml/g or less, and the mixed powder is loaded in a porous alkaline-proof metal body. A nickel-hydrogen battery, in-which the foregoing metal hydride electrode and the foregoing nickel electrode are wound with a separator put between them, aqueous solution of potassium hydroxide is filled therein and sealed, and they are maintained under standing condition for 5 hours or more.

Metal hydride electrode, nickel electrode and nickel-hydrogen battery

Metal hydride electrode

Nickel electrode for alkaline battery

A nickel electrode for use in an alkaline battery using a network-like alkaline-proof metal mesh having pores at the inside thereof as a core metal current collector, as well as an alkaline battery using such a nickel electrode. Inexpensive nickel electrode having high performance, great capacity can be obtained at high productivity.

Nickel electrode and alkaline battery using the same

Growing community of inventors

Takatsuki, Japan

Masaharu Watada