High-capacity long-service-life hydrogen-bearing rare-earth alloy as electrodes of secondary nickel-metal oxide battery

Abstract

A high-capacity long-life hydrogen-bearing alloy as electrode of secondary Ni-metal hybride battery has a chemical formula: Mm1-yMy(NiCoN)x, where Mm is the Ce0enriched mixed rare earth, y=0.01-0.8, x-2-4, M is chosen from Mg, Ca, Be, etc, and N is chosen from Mn, Fe, Mo, Co, etc. Said secondary bettery features high activating performance, initial capacity and high-multiplication discharge performance.

Description

technical field [0001] The invention relates to a secondary battery, in particular to a high-capacity and long-life rare earth hydrogen storage electrode alloy for a nickel-metal hydride (Ni-MH) secondary battery. Background technique [0002] Since the discovery of LaNi by the Dutch Philips laboratory in 1970 5 Since the reversible hydrogen storage properties, hydrogen storage alloys are used in hydrogen storage and transportation, hydrogen purification and compression, heat pumps and refrigeration, hydrogen-fired vehicles, nickel-metal hydride (Ni-MH) secondary batteries, fuel cells and hydrogen isotopes Separation and other fields have been widely used. Especially in nickel-metal hydride (Ni-MH) secondary batteries, due to its advantages of high capacity, long cycle life, no memory effect, strong resistance to overcharge and overdischarge, and no environmental pollution, it has become the focus of many scholars at home and abroad. research hotsp...

AI Technical Summary

Problems solved by technology

But due to the rare earth base AB 5 The low capacity (about 320mAh/g) of the type alloy has prompted people to research and develop hydrogen storage electrode alloys with higher capacity.

[0009] AB 2 Type alloys once attracted people's attention. It has high electrochemical discharge capacity and long cycle life, but its large current discharge capacity and initial activation performance are relatively poor, and its cost is high, so it is difficult to be practical.

Magnesium-based alloys use relatively cheap elements such as magnesium and nickel as raw materials, so the cost is quite lo

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