Alkaline battery and method for manufacturing an alkaline battery

By blending silver oxide with manganese dioxide, using a specific electrolyte concentration and molar ratio, and adjusting separator resistivity, the alkaline battery achieves enhanced discharge performance and cost-effectiveness.

JP2026110825APending Publication Date: 2026-07-02SEIKO INSTR INC
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Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Applications
Current Assignee / Owner
SEIKO INSTR INC
Filing Date
2026-04-28
Publication Date
2026-07-02

AI Technical Summary

Technical Problem

Alkaline batteries face challenges in achieving low cost and maintaining sufficient discharge capacity due to the use of manganese dioxide, which has a lower specific gravity than silver oxide, leading to increased battery height and limited positive electrode material usage.

Method used

The alkaline battery incorporates a positive electrode mixture containing a blend of silver oxide and manganese dioxide in a specific ratio, uses a potassium hydroxide aqueous solution with a concentration of 40-50%, and adjusts the molar ratio of potassium hydroxide to sodium hydroxide in the negative electrode mixture to 89:11-96:4, along with a separator electrical resistivity of 250 mΩ·cm², to enhance discharge characteristics.

Benefits of technology

This configuration results in an alkaline battery with improved discharge characteristics, reduced costs, and prevents capacity degradation under heavy load conditions.

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Abstract

The present invention aims to provide an alkaline battery and a method for manufacturing an alkaline battery. [Solution] The alkaline battery according to the present invention is an alkaline battery 1 in which a positive electrode, a negative electrode, a separator 6, and an electrolyte are contained in a container 8 which has a positive electrode container 2, a negative electrode container 3, and a gasket 4 that seals the positive electrode container 2 and the negative electrode container 3, wherein the electrolyte is a potassium hydroxide aqueous solution with a concentration of 40-50%, the negative electrode consists of a negative electrode mixture 7 containing a negative electrode active material, a thickener, and an alkaline aqueous solution, the alkaline aqueous solution is an alkaline aqueous solution containing potassium hydroxide and sodium hydroxide in a molar ratio of 89:11-96:4, and the positive electrode consists of a positive electrode mixture 5 comprising a positive electrode active material containing silver oxide and manganese dioxide, the blending ratio of manganese dioxide in the positive electrode mixture 5 is 25-44% by mass.
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