AB5 type negative pole hydrogen storing material

Abstract

The invention provides a cobalt-free low-nickel AB5-type cathode hydrogen storage material. The atomic ratio thereof comprises the following components: La1-xMgxNi2Sn1Cu1.5Mn0.4Al0.1, wherein x is more than 0 and less than and equal to 0.125, since the elements (Co and Ni) with higher cost are replaced by the elements (Sn and Cu) with lower cost, the elements of Mg, Mn and Al are added, and the cost of the material is remarkably reduced under the conditions of good activation of the material and the electrochemistry charging and discharging capacity. The AB5-type cathode hydrogen storage material can be taken as the negative electrode material and used for preparing the nickel-hydrogen battery.

Description

Technical field [0001] The invention relates to a battery negative electrode hydrogen storage material, in particular to an AB used in a nickel-hydrogen battery 5 -Type anode hydrogen storage material. Background technique [0002] Since the Ni-MH battery was put on the market in the 1990s, it has been widely welcomed due to its high capacity, long life, no memory effect, and no environmental pollution. The market share is getting higher and higher. The types of batteries are also changed from AA, AAA ordinary batteries are developing to 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. [0003] At present, for nickel-metal hydride batteries, the anode material used is mainly mixed rare earth MmNi 5 Type hydrogen storage alloy, the electrochemical capacity of the alloy is generally about 300~330mAh / g, and the typical composition is MmNi 3.55...

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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 electrochemical capacity of the alloy is generally about 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

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