AB5 type negative pole hydrogen-storage material

Abstract

The invention provides a AB5 type negative hydrogen storage material prepared by the rapid hardening band method, wherein, the atom proportions comprise: Mm1-zDyZnI3.55Co0.75-x-yFexCuyMn0.4Al0.3, in which the x + y ranges from 0-0.7, the z ranges from 0-0.039, the Mm is rare-earth compound formed by La, Ce, Pr and Nd elements etc., the weight of rare-earth compound Mm is selected as standard, the weight of La is 64.5-67.5 %, the weight of Ce is 22.0-24.0 %, the weight of Pr is 2.5-3.5 % and the weight of Nd is 7.0-9.0 %. The cooling rate of used rapid hardening band method is decided by the controlled linear speed 1-3 m / s of rotating surface of cooling roll and the thickness of product 0.2-0.5. Since the invention utilizes the rapid hardening band method, selects the correct cooling rate, uses a little rare-earth element Dy, and replaces the element Co with the more cheaper element Fe and Cu, the alloy can keep excellent active property, electrochemical charging and discharging capacity and cycle life, while the cost is reduced markedly.

Description

technical field [0001] The invention relates to a battery negative electrode hydrogen storage material. In particular, the invention relates to AB for NiMH batteries 5 The invention discloses a negative electrode hydrogen storage material and a preparation method thereof. The negative electrode hydrogen storage material is characterized in that the cost of the negative electrode hydrogen storage material is more than 30% lower than that of the hydrogen storage materials commonly used in the current market. Background technique [0002] Since the Ni-MH battery was put into the market in the 1990s, due to its high capacity, long life, no memory effect, and no environmental pollution, it has been widely welcomed and its market share is increasing. AAA ordinary batteries have developed into other types, and the products are widely used in electric tools, household appliances, computers, construction, aerospace, communications and mopeds, etc., and the development is very rapid....

AI Technical Summary

Problems solved by technology

[0003] At present, for nickel-metal hydride batteries, the anode materials used are mainly mixed rare earth MmNi. 5 - type hydrogen storage alloy, the alloy capacity is generally around 300-330mAh / g, and the typical composition is MmNi 3.55 co 0.75 mn 0.4 al 0.3 , where Mm is a mixed rare earth, the main components are La, Ce, Pr, Nd, in the composition formula, the weight percentage of cobalt is about 10wt%, because cobalt plays a very important role in the cycle life of the negative electrode, and in the content The best effect is achieved when it is about 10wt%, so it becomes an indispensable element, but at the same time, the price of cobalt is relatively expensive, and it is the most expensive element in the formula of this ingredient. In addition to cobalt, the formula also contains cost second only to About 50% of cobalt is nickel, and nickel is one of the most important elements affecting its hydrogen absorption and desorption capacity. The existence of these two elements has led to an increase in the cost of hydrogen storage materials and nickel-hydrogen batteries