Alkalline battery-use anode active material and production method therefor, and alkalline battery

Abstract

An alkaline battery-use anode active material of a layered crystal structure containing oxy nickel hydroxide. The anode active material has a diffraction peak at a diffraction angle 2theta position of 8.4-10.4 degrees due to X-ray diffraction by CuK alpha-ray. The alkaline battery has an anode containing an anode active material, a cathode containing a cathode active material and an alkaline solution as an electrolyte, and contains an anode active material having the above specific diffraction peak as the anode active material. A method of producing an alkaline battery-use anode active material of a layered crystal structure containing oxy nickel hydroxide has the step of oxidizing a layered-crystal-structure starting material consisting of beta type nickel hydroxide in an air stream containing an alkaline solution or alkali to produce the above anode active material.

Description

Technical field [0001] The present invention relates to a cathode active material for alkaline batteries, the material has a new crystal structure, and also relates to a method for manufacturing the material, and an alkaline battery having the cathode active material. Background technique [0002] Alkaline batteries, such as nickel-metal hydride batteries using β-type nickel hydroxide as the cathode active material, are widely used in home appliances, communication equipment, AV-related equipment, and OA-related equipment. Such alkaline batteries are used not only as primary batteries (discharge only once), but also as secondary batteries (alkaline storage batteries) that are repeatedly charged and discharged. [0003] In alkaline batteries, the cathode active material changes its valence during charging and discharging. That is, at the time of charging, the cathode active material exists as β-type nickel oxyhydroxide (βNiOOH) in which Ni has a valence of 3. On the other hand, wh...

AI Technical Summary

Problems solved by technology

As a result, conventional alkaline batteries do not have sufficient battery capacity, and therefore, there is a problem that they cannot be used for electronic equipment or the like requiring high energy density

[0008] However, even with the above-mentioned conventional techniques, it is still difficult to make the utilization rate of nickel hydroxide equal to or higher than 100%, and it is still impossible to obtain a large-capacity alkaline battery

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