Preparation method for improving hydrogen storage performance of AB2C9 La-Mg-Ni-based alloy

A base alloy and alloy technology, applied in the field of metal hydride batteries, can solve the problems of electrochemical capacity decay hindering application, and achieve the effects of good electrochemical performance, guaranteed uniformity and easy activation

Inactive Publication Date: 2010-09-29
GUANGXI UNIV
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Problems solved by technology

However, high capacity AB 2 C 9 Type hydrogen storage alloys, because the electrochemical capacity fades too fast in the electrolyte, which hinders its practical application

Method used

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  • Preparation method for improving hydrogen storage performance of AB2C9 La-Mg-Ni-based alloy
  • Preparation method for improving hydrogen storage performance of AB2C9 La-Mg-Ni-based alloy
  • Preparation method for improving hydrogen storage performance of AB2C9 La-Mg-Ni-based alloy

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[0034] La 2-x Ti x MgNi 9 (x=0.1, 0.2 or 0.3) alloy according to the atomic ratio of La:Ti:Mg:Ni=(2-x):x:1:9 (x=0.1, 0.2 or 0.3) with a good sample (considering Mg in volatilization during the smelting process, Mg mass excess 10%), then first put Ti and Ni with similar melting points in the sample into the reactor of the magnetic levitation induction melting furnace, and after 3 times of vacuuming and argon cleaning, in about 1atm argon Under the protection of air, gradually increase the frequency from zero until the alloy is completely suspended. At this time, the frequency value is the highest frequency for smelting. The alloy is left at the highest frequency for 60 seconds, and then the frequency value is quickly adjusted back to zero to stop heating. After cooling down to room temperature naturally, it was taken out from the reactor, and smelted into Ti-Ni alloy repeatedly in this way twice. According to the above smelting method, La and Ti-Ni are repeatedly melted into...

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Abstract

The invention relates to a preparation process for improving the hydrogen storage performance of an AB2C9 La-Mg-Ni-based alloy. The alloy has a chemical formula La2-xTixMgNi9 (x is 0.1, 0.2 or 0.3); and the purities of La, Ti, Mg and Ni serving as elements of the alloy are all more than 99.9 percent. The preparation process comprises the step of performing annealing treatment on the La2-xTixMgNi9 alloy (x is 0.1, 0.2 or 0.3) prepared by a magnetic suspension induction smelting method in vacuum under the protection of argon, wherein the annealing temperature is between 800 and 900 DEG C and the annealing time is 10 hours. Compared with the as-cast alloy, the alloy subjected to annealing treatment has the advantages of increasing the hydrogen absorption capacity, reducing the pressure of the hydrogen absorbing and discharging platform, improving the electrochemical property and the like. The process has great significance for promoting the practical process of the AB2C9 La-Mg-Ni-based alloy.

Description

technical field [0001] The invention relates to a metal hydride battery, in particular to a battery with improved AB 2 C 9 The preparation method of hydrogen storage properties of type La-Mg-Ni base alloy. technical background [0002] In recent years, with the widespread popularization and application of small portable electronic products such as digital cameras, notebook computers, and mobile phones, as well as the industrialized development of electric bicycles and electric vehicles, and the requirements for environmental protection, people are demanding high energy density and non-polluting products. The requirements for secondary batteries are getting higher and higher, and Ni-MH batteries, as a green and environmentally friendly secondary battery, are facing unprecedented opportunities and challenges. At present, the key to improving the competitiveness of Ni-MH batteries is to improve the hydrogen storage performance of its anode material hydrogen storage alloys. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/02B22F1/00
Inventor 郭进蓝志强蒋卫卿韦文楼黎光旭
Owner GUANGXI UNIV
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