Praseodymium-and-neodymium-free nickel AB5 type hydrogen storage alloy

Abstract

The invention discloses praseodymium-and-neodymium-free nickel AB5 type hydrogen storage alloy. The praseodymium-and-neodymium-free nickel AB5 type hydrogen storage alloy is characterized in that the formula of the AB5 type hydrogen storage alloy is La1-xCexNiaCobMncAldCUeMf, wherein M is one, two or more than two of Fe, Sn and B; x, a, b, c, d, e and f represent a molar ratio; x is more than or equal to 0.05 and less than or equal to 0.35; a is more than or equal to 3.70 and less than or equal to 4.2; b is more than 0 and less than or equal to 0.75; c is more than or equal to 0.15 and less than or equal to 0.42; d is more than or equal to 0.20 and less than or equal to 0.40; e is more than or equal to 0.02 and less than or equal to 0.30; f is more than or equal to 0 and less than or equal to 0.10; and the sum of a, b, c, d, e is more than or equal to 4.70 and less than or equal to 5.30. The hydrogen storage alloy does not contain praseodymium or neodymium, so production cost can be reduced, the corrosion resistance of the alloy can be improved, the service life of the alloy can be prolonged, and the alloy is easy to activate.

Description

technical field [0001] The invention relates to a rare earth hydrogen storage alloy material, in particular to a praseodymium-free neodymium-nickel AB 5 type hydrogen storage alloy. Background technique [0002] Nickel-metal hydride batteries are widely used in aerospace, mobile phones, notebook computers, electric vehicles and other fields due to their high specific capacity, rapid charge and discharge, overcharge resistance, no pollution, and long cycle life. AB 5 The rare-earth hydrogen storage alloys have the advantages of reversible hydrogen absorption and desorption at normal temperature and pressure, easy activation, and fast hydrogen absorption and desorption reaction speed, and have been extensively studied as Ni / MH battery anode materials. [0003] Currently commercialized rare earth-based AB 5 The specific capacity of the type hydrogen storage alloy is about 300-340mAh / g, and the A side uses battery-grade mixed rare earth metals, mainly including lanthanum-rich...

AI Technical Summary

Problems solved by technology

In recent years, rare earth materials have developed rapidly in magnetic materials, luminescent materials, nuclear energy materials, etc., which has continuously expanded the consumer market for elements such as neodymium, praseodymium, samarium, and yttrium. It is one of the elements with high value and good market, which causes a large surplus of rare earth metals lanthanum and cerium, and the by-products of a large amount of accumulation seriously affect the balanced development of the rare earth industry; at the same time, rare earth metals, especially battery grade mixed rare earths, metal praseodymium, The price of metal neodymium has been rising all the way, resulting in high cost of hydrogen storage alloys and a decline in market competitiveness

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