METHOD FOR MANUFACTURING HYDROGEN STORAGE ALLOY

PROBLEM TO BE SOLVED: To enhance high rate discharging characteristics at a low temperature by a process for treating the surface with an alkali solution having a specified temperature or higher; a process adding a pH adjusting agent and a reducer in the alkali solution for reduction; and a process...

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1. Verfasser:	ISE TADASHI
Format:	Patent
Sprache:	eng
Schlagworte:	BASIC ELECTRIC ELEMENTS CHEMICAL SURFACE TREATMENT CHEMISTRY CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION ORPROCESSING OF GOODS COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATIONOR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY IONIMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL COATING MATERIAL WITH METALLIC MATERIAL COATING METALLIC MATERIAL COMPOUNDS THEREOF DIFFUSION TREATMENT OF METALLIC MATERIAL ELECTRICITY FERROUS OR NON-FERROUS ALLOYS GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL INORGANIC CHEMISTRY METALLURGY NON-METALLIC ELEMENTS PRETREATMENT OF RAW MATERIALS PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY PRODUCTION AND REFINING OF METALS REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGYGENERATION, TRANSMISSION OR DISTRIBUTION SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE TREATMENT OF ALLOYS OR NON-FERROUS METALS
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To enhance high rate discharging characteristics at a low temperature by a process for treating the surface with an alkali solution having a specified temperature or higher; a process adding a pH adjusting agent and a reducer in the alkali solution for reduction; and a process for washing after alkali treatment is finished. SOLUTION: This hydrogen storage alloy having composition formula MmNi3.6Co0.6Al0.3Mn0.5, for example, (Mm is La, Ce, or the like) is prepared, and crushed to obtain hydrogen storage alloy powder having an average particle size of 60 μm. The powder is added in the alkali treatment solution prepared by dissolving LiOH in a KOH solution having a specific gravity of 1.3 in a ratio of 30 g/L, the resulting mixture is heated at 60 deg.C or higher, at 90 deg.C for example for surface treating. The pH adjusting agent made of hydrochloric acid solution is added to the resulting mixture to adjust pH, the reducer made of sodium hypophosphite is added in a ratio of 1 M/L to the pH adjusted solution for reduction treating, and the resulting hydrogen storage alloy powder is sufficiently washed. High rate discharging characteristics at a low temperature of a nickel - hydrogen alkaline storage battery can be enhanced.