Matsushita Electric Industrial Co., Ltd.

Panasonic Corporation

Yoichi Izumi

Hiroyuki Sakamoto

Hidekatsu Izumi

Isao Matsumoto

Yoshio Moriwaki

Tetsuo Nanno

Hirokazu Kimiya

Yukihiro Okada

Chiaki Iwakura

Naoji Furukawa

Yoshitaka Dansui

Yasuharu Yamamura

Munehisa Ikoma

Yasushi Nakamura

Yoshinori Toyoguchi

Shozo Fujiwara

Kohji Yuasa

Hideo Kaiya

Futoshi Tanigawa

Akihiro Maeda

Toru Inagaki

Norikatsu Akutsu

Shinji Murashige

Hiroshi Nishiyama

Katsumi Yamashita

Takashi Tokuhiro

An alkaline storage battery includes: a positive electrode containing nickel hydroxide; a negative electrode; a separator layer intervening between the positive electrode and the negative electrode; and an alkaline electrolyte. The separator layer includes a water-absorbing polymer, a water repellent, an alkaline aqueous solution, and a scavenger capable of trapping an element which leaches from the negative electrode into the alkaline aqueous solution. The scavenger comprises an oxygen-containing metal compound. The negative electrode is a hydrogen storage alloy electrode, a cadmium electrode or a zinc electrode. The water-absorbing polymer comprises a cross-linked polymer having at least one kind of monomer unit selected from the group consisting of an acrylate unit and a methacrylate unit.

Alkaline storage battery and method for producing the same

An electrochemical device comprising an electrolyte and at least one electrode plate, the electrochemical device having a metal part constituting the electrode plate or being connected to the electrode plate; the electrolyte comprising a solute and a solvent dissolving the solute; the metal part having an insulating oxide layer for preventing the electrolyte from creeping on at least part of the surface of the metal part.

Electrochemical device including electrolyte

A method for separating a metal-resin joint including the steps of: (1) immersing an article including a metal-resin joint with a counter electrode in an alkaline solution; and (2) applying a voltage over a certain time period between the metal portion of the joint and the counter electrode such that the potential of the metal portion is lower than that of a standard hydrogen electrode.

Method and apparatus for releasing metal-resin joint

A particulate positive electrode active material for an alkaline storage battery comprising: (a) solid solution nickel hydroxide particles containing at least magnesium and (b) a coating layer comprising cobalt oxide being formed on the surface of the solid solution nickel hydroxide particles. The amount of magnesium contained in the solid solution nickel hydroxide particles (a) is not smaller than 2 mol % and not larger than 15 mol % of the total amount of metal elements contained in the solid solution nickel hydroxide particles (a). BET specific surface area of the solid solution nickel hydroxide particles (a) measured by nitrogen gas adsorption is not smaller than 5 m/g and not larger than 15 m/g. The coating layer (b) further comprises at least one element Xs selected from the group consisting of yttrium, ytterbium, lutetium, titanium and calcium.

Positive electrode active material for alkaline storage battery, positive electrode and alkaline storage battery

Disclosed is an alkaline storage battery comprising: a positive electrode comprising nickel hydroxide; a negative electrode; and an electrolyte layer interposed between the positive electrode and the negative electrode. The electrolyte layer comprises a water absorbent polymer and an aqueous alkaline solution. The water absorbent polymer is obtained by saponification of a copolymer comprising 100 parts by weight of monomer (A) and 0.01 to 10 parts by weight of monomer (B). The monomer (A) has at least one group capable of being converted to a carboxyl group by saponification and has one polymerizable double bond, and the monomer (B) has two or more polymerizable double bonds.

Alkaline storage battery

Electrode plate assemblies forming independent elements for electromotive force each contained in a partition member are series-connected and accommodated in a battery case. Each element is constructed as a nickel-metal hydride rechargeable battery cell and has an electromotive force of predetermined voltage, and so the battery connected in series has an output voltage and can be applied to general-purpose uses.

Closed alkaline storage battery

An alkaline zinc secondary battery in accordance with the present invention comprises a separator layer comprising a gel electrolyte comprising a water absorbent polymer and an alkaline aqueous solution, disposed between a negative electrode comprising at least one selected from the group consisting of zinc and zinc oxide and a positive electrode. Because the separator layer is in a gel form, transfer of zinc ions is limited. Thereby, deformation of the negative electrode and generation of dendrite due to charge and discharge of the battery are substantially inhibited. Moreover, since impurity ions such as nitrate ions become less prone to move, self-discharge of the battery is also inhibited.

Alkaline zinc secondary cell and method for preparation thereof

In order to obtain a nickel-metal hydride storage battery having a long cycle life and a low self-discharge rate, in a nickel-metal hydride storage battery comprising: a positive electrode containing nickel hydroxide; a negative electrode containing a hydrogen storage alloy; a separator interposed between the positive and negative electrodes; and an electrolyte comprising an aqueous alkaline solution, a water absorbent polymer, a water repellent and an aqueous alkaline solution are added into the separator. This battery can be produced with low cost.

Nickel-metal hydride storage battery and production method thereof

The paste type positive electrode of the present invention contains a first active material and a second active material. The first active material comprises X parts by weight of particulate nickel hydroxide with aX/100 parts by weight of cobalt oxyhydroxide carried thereon. The second active material comprises Y parts by weight of particulate nickel oxyhydroxide, of which an oxidation number of nickel is &#x3b1;, with bY/100 parts by weight of cobalt oxyhydroxide carried thereon. Here, all the following relations are satisfied: (1) 2.5&#x2266;&#x3b1;&#x3c;3.0, (2) 0.01&#x2266;(aX/100+bY/100)/(X+Y)&#x2266;0.20, (3) 0&#x3c;b&#x2266;a&#x2266;10 or 0=b&#x3c;a&#x2266;10, and (4) 2.1&#x2266;(2X+&#x3b1;Y)/(X+Y)&#x3c;2.2.

Paste type positive electrode for alkaline storage battery, and nickel-metal hydride storage battery

In order to provide a positive electrode active material capable of producing an alkaline storage battery having a high discharge voltage and an excellent discharge characteristic and also provide a positive electrode and alkaline storage battery containing thereof, a positive electrode active material for an alkaline storage battery comprising a nickel hydroxide powder is used, in which the nickel hydroxide is a solid solution containing magnesium, the magnesium content in the nickel hydroxide is 2 to 7 mol % of all metallic elements contained in the nickel hydroxide, the tap density of the nickel hydroxide is 1.9 g/cm or more, the half-width of a peak attributed to (101) face near 2&thgr;&equals;37 to 40&deg; in a powder X-ray diffraction pattern of the nickel hydroxide by CuK&agr; radiation is 0.7 to 1.2&deg; and the sulfate ion content in the nickel hydroxide is 0.5 wt % or less.

Positive electrode active material for alkaline storage batteries, and positive electrode and alkaline storage battery using the same

An alkaline storage battery comprising an improved separator and having a high energy density and an excellent cycle life characteristic is disclosed. The alkaline storage battery in accordance with the present invention comprises a positive electrode including a nickel hydroxide material as an active material, a negative electrode, a separator and an electrolyte, wherein the nickel hydroxide material of the positive electrode contains at least Mn or is disposed with a coating of a cobalt oxide material on its surface and wherein the separator carries particles of a hydrophilic and insulating metal oxide directly attached to its surface. The metal oxide particle is preferably at least one selected from the group consisting of titanium oxide, aluminum oxide, zirconium oxide, potassium titanate, tungsten oxide, and zinc oxide. The most preferable one is anatase type TiO .

A metal nitride is added as the conductivity-imparting component to a positive electrode for alkaline storage battery, which contains the active material comprising nickel hydroxide as the main component to provide alkaline storage batteries having the good cycle characteristics.

Non-sintered type positive electrode for alkaline storage battery and alkaline storage battery

A process for producing positive electrode active material includes feeding an aqueous nickel salt solution, aqueous solutions of different kinds of metals, aqueous solution containing ammonium ions and aqueous alkali solution each independently and simultaneously into a reaction vessel such that the amount of alkali metal is 1.9-2.3 moles relative to 1 mole of the total amount of nickel and different kinds of metals and the amount of ammonium ions is 2 moles or more relative to 1 mole of the total amount of nickel and different kinds of metals, the pH in the vessel is 11-13, the temperature in the vessel is 30-60&deg; C. and the average residence time is 20-50 hours. Further, in the process step of continuously growing the complex metal oxide particles from the salts of a plurality of metal elements through a plurality of successive reaction-deposition stages, the compositions and/or the kinds of the salts of metal element groups used for forming the oxide in the reaction-deposition stages adjacent to each other are made to be different from each other.

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Moriguchi, Japan

Yoichi Izumi