MANUFACTURE OF NEGATIVE ACTIVE MATERIAL FOR ALKALINE BATTERY

PURPOSE:To decrease hydrogen gas evolution and to enhance discharge performance by amalgamating a zinc-lead-bismuth alloy in an inert gas atmosphere with mercury-indium amalgam in a dry process so that each component is contained at a specified ratio. CONSTITUTION:Zinc-lead-bismuth alloy powder is a...

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Hauptverfasser:	MATSUMOTO MITSUGI, UEMURA TOYOHIDE, YAMAGUCHI TOMIKO
Format:	Patent
Sprache:	eng
Schlagworte:	BASIC ELECTRIC ELEMENTS ELECTRICITY PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY
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Zusammenfassung:	PURPOSE:To decrease hydrogen gas evolution and to enhance discharge performance by amalgamating a zinc-lead-bismuth alloy in an inert gas atmosphere with mercury-indium amalgam in a dry process so that each component is contained at a specified ratio. CONSTITUTION:Zinc-lead-bismuth alloy powder is amalgamated in an inert gas atmosphere with mercury-indium amalgam or mercury-indium-lead amalgam in a dry process and amalgamated zinc alloy powder containing 0.01-2.0wt.% lead, 0.05-1.0wt.% bismuth, 0.01-0.1wt.% indium, and 0.01-1.0wt.% mercury is obtained. Even if the content of mercury is as low as 0.01-1.0wt.%, hydrogen gas evolution in an alkaline battery is remarkably decreased compared with a negative active material having the same composition prepared in a different process, and furthermore discharge performance is increased.