Samarium-containing praseodymium and neodymium-free hydrogen storage alloy for nickel-hydrogen power battery

Abstract

The invention discloses a samarium-containing praseodymium and neodymium-free hydrogen storage alloy for a nickel-hydrogen power battery. The hydrogen storage alloy is characterized in that the atomic ratio of the composition is La(1-x-y)CexSmyNiaCobMncAldMe, wherein M is one or two of Fe, Cu and B; and x is 0.20-0.70, y is 0.01-0.30, a is 3.30-4.20, b is 0.10-0.70, c is 0.40-0.65, d is 0.10-0.35 and e is 0.05-0.30. The samarium-containing praseodymium and neodymium-free hydrogen storage alloy for a nickel-hydrogen power battery disclosed by the invention does not contain relatively expensive rare earth elements such as praseodymium, neodymium and the like and thus reduces the production cost, and also has the performance such as easy activation, high discharge voltage and capacity, good high-current discharge and the like.

Description

technical field [0001] The invention relates to a hydrogen storage alloy for a nickel-hydrogen battery, in particular to a hydrogen storage alloy containing samarium and no praseodymium and neodymium for a nickel-hydrogen power battery. Background technique [0002] The nickel-metal hydride battery using rare earth hydrogen storage alloy as the negative electrode active material has the characteristics of high specific energy, fast charge and discharge, no pollution and long service life. It is the battery of choice for hybrid electric vehicles at home and abroad. However, as the price of rare earth elements continues to rise, the proportion of rare earth elements used to prepare hydrogen storage alloys to the overall battery cost has gradually increased from 14% to 55%. As the main anode material for nickel-metal hydride batteries at present, the rare earth series AB 5 Type hydrogen storage alloys have been successfully industrialized, the typical AB on the market today 5...

AI Technical Summary

Problems solved by technology

[0003] At present, the general commercially available rare earth AB for power supply 5 type hydrogen storage alloy, the composition is usually La 0.6 Ce 0.2 PR 0.05 Nd 0.15 Ni 4 co 0.45 mn 0.4 Al 0.25 Or similarly, the proportion of Pr and Nd in the ratio is large, although it has a certain high-current discharge performance, but the production cost is high, resulting in an increase in the overall cost of nickel-metal hydride batteries produced using this type of alloy, and a decline in competitiveness

And the general commercially available rare earth AB 5 Type Pr, Nd-free hydrogen storage alloy, the composition is usually La 0.6 Ce 0.4 Ni 3.8 co 0.5 mn 0.4 Al 0.3 or similar, its high current discharge capability is not ideal

Chinese patents 102492873A and 102758104A both disclose a kind of praseodymium-free neodymium AB 5 Although the former has a high discharge capacity (at 0.2C) and is easy to activate, it does not mention the high-current discharge performance of the alloy; although the latter has been tested for high-current discharge, its maximum discharge The capacity and hydrogen storage platform are both low, and the activation characteristics of the alloy are not mentioned

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