Toyota Jidosha Kabushiki Kaisha

Japan Metals & Chemicals Co., Ltd.

Tanaka Chemical Corporation

Makio Kon

Hideki Nakayama

Hiroshi Suyama

Masashi Kodama

Shigeki Sato

Naotaka Sawada

Hiroshi Nishiyama

Katsuyuki Kudo

Takao Sawa

Saki Notoyama

Mikio Hata

Tomoya Matsunaga

Kunihiro Nobuhara

Taiki Yasuda

Naoyoshi Terashita

A hydrogen storage alloy suitable for a negative electrode of an on-board alkaline storage battery, and an alkaline storage battery using the alloy, which has an AB-type crystal structure as a main phase, represented by: (SmLaR)MgTNiCoMe. (R is selected from Pr, Nd; T is selected from Ti, Zr, Hf; M is selected from V, Nb, Ta, Cr, Mo, W, Mn, Fe, Cu, Al, Si, P, B; the following conditions are met: 0<x<1.0, 0<y<1.0, 0.8≤x+y≤1.0, x+y+z=1.0; 0.93≤(x−y)·(1−a−b)+4.5(+b)≤1.62, 0<a≤0.45, 0≤b≤0.05, 0≤d≤0.7, 0≤e≤0.15, 2.85≤c+d+e≤3.15 and 0.01≤d+e).

Hydrogen storage alloy for alkaline storage battery and alkaline storage battery using the same

Provided is a method for producing a composite alloy for use in an electrode for an alkaline storage battery, including a powder preparation step of preparing a hydrogen storage alloy powder containing Ti and Cr and having a BCC structure, an etching step of applying an acid to the hydrogen storage alloy powder prepared in the powder preparation step, a Pd film forming step of coating the surface of the hydrogen storage alloy powder subjected to the etching step with Pd using a substitution plating method, and a heat treatment step of heating the hydrogen storage alloy powder having a Pd film formed, at said heating being a temperature of 500&#xb0; C. or less, wherein in the Pd coating forming step, the hydrogen storage alloy powder is coated with Pd under the condition that the Pd element weight ratio of the composite alloy to be produced is 0.47% or more.

Method for producing composite alloy and method for producing electrode

An objective of the present invention is to provide a positive electrode active material that can inhibit the capacity changes associated with temperature variations, and an alkaline battery that contains this positive electrode active material. Aluminum and ytterbium are at least partially solid-dissolved in nickel hydroxide in the nickel composite hydroxide present in the positive electrode active material of the present invention.

Positive electrode active material and alkaline battery

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Mishima, Japan

Makio Kon