New-type hydrogen-storage RE electrode alloy for secondary Ni-metal oxide battery

Abstract

The composition of new type rare earth system hydrogen-storing electrode alloy which high electrochemical volume, long cycle life and good high-multiplying power characteristics for Ni-MH secondary cell is ABx, in which A=La1-yMy, B=(NiCoN), y is greater than or equal to 0.01 and less than or equal to 0.8; x is greater than or equal to 2.0 and less than or equal to 4.0; M is one or two or more than two kinds of Ce, Pr, Nd, Mg, Ca, Be, Sr, and Ba, And Ni is one or two or more than two kinds of Mn, Fe, Mo, Co, Al, Si, Ga, S, Sc, Ti, V, Cr, Cu, Zn, Zr, Nb, RA, Rh, Cd, W, Hf, Ta, B, P, Ge, As, Se. In and Sn.

Description

technical field [0001] The invention relates to a metal hydride secondary battery, in particular to a novel rare earth hydrogen storage electrode alloy for a nickel-metal hydride secondary battery. Background technique [0002] In recent years, compared with Ni-Cd secondary batteries, nickel-metal hydride (Ni-MH) secondary batteries have high capacity, long cycle life, no memory effect, strong anti-overcharge and over-discharge capabilities and No environmental pollution and other advantages have become the focus of many scholars at home and abroad. [0003] From the current point of view, more hydrogen storage electrode alloys have been studied, including rare earth-based AB 5 Type alloy, AB 2 Type alloys, magnesium-based alloys and vanadium-based solid solution alloys. Among them, the rare earth base AB 5 The research on alloys is the most mature and has already been industrialized. But due to the rare earth base AB 5 The low capacity of typ...

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Problems solved by technology

But due to the rare earth base AB 5 The low capacity of type alloys has prompted people to research and develop hydrogen storage electrode alloys with higher capacity.

[0004] AB 2 The type Laves phase alloy 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 low, and magnesium-based alloys have high initial electrochemical discharge capacity and excellent activation performance, but the alloy in alkaline electrolyte Corrosion is quite serious, resulting in a sharp decline in capacity, and it will not be practical in the short term

Vanadium-based solid solution alloys, like magnesium-based alloys, also have high initial electrochemical discharge capacity, but due to the serious desolvation of vanadium in alkaline electrolyte, it will also lead to a sharp decline in capacity, and because vanadium is relatively expensive without practical value

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