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Fluorination modification method for AB3-type hydrogen storage alloy

A hydrogen storage alloy and modification technology, applied in electrical components, battery electrodes, circuits, etc., can solve the problems of easy corrosion, easy oxidation of the surface, poor cycle stability, etc., and achieve simple operation, excellent kinetic performance, and good cycle stability sexual effect

Inactive Publication Date: 2014-07-16
GUILIN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

AB 3 Hydrogen storage alloys have been favored by scientists in recent years because of their high discharge capacity, but they have been difficult to be commercialized because of their surface oxidation, corrosion, and poor cycle stability.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] (1) Preparation of AB by vacuum induction melting method 3 Type Mm 0.78 Mg 0.22 Ni 2.48 mn 0.09 Al 0.23 co 0.47 The parent alloy ingot, after the alloy ingot is mechanically crushed, ball milled at a speed of 300 rpm for 60 minutes, and sieved into 300 mesh Mm 0.78 Mg 0.22 Ni 2.48 mn 0.09 Al 0.23 co 0.47 Alloy powder; the Mm is mixed rare earth, the weight percentage of its composition is: 82.3% La and 17.7% Nd.

[0011] (2) Put the alloy powder sieved in step (1) into the fluorinated solution, stir at 50°C for 10 minutes, and then add 0.05 mol / L NaBH 4 solution until the hydrogen bubbles completely disappeared to obtain the treated Mm 0.78 Mg 0.22 Ni 2.48 mn 0.09 Al 0.23 co 0.47 Alloy powder; the fluorinated solution is a solution containing 0.02ml HF and 0.15g NaF per liter.

[0012] (3) The processed Mm obtained in step (2) 0.78 Mg 0.22 Ni 2.48 mn 0.09 Al 0.23 co 0.47 The alloy powder was washed with deionized water and absolute ethanol in seq...

Embodiment 2

[0015] Except that the fluorinated solution used in step (2) was a solution containing 0.05 ml HF and 0.15 g NaF, the rest were the same as in Example 1 to obtain fluorinated modified AB 3 Type hydrogen storage alloy M2.

Embodiment 3

[0017] Except that the fluorinated solution used in step (2) is a solution containing 0.10ml HF and 0.15g NaF, all the others are the same as in Example 1 to obtain fluorinated modified AB 3 Type hydrogen storage alloy M3.

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Abstract

The invention discloses a fluorination modification method for AB3-type hydrogen storage alloy. An AB3-type (Mm0.78 Mg0.22 Ni2.48 Mn0.09 Al0.23 Co0.47) parent alloy ingot is prepared in a vacuum induction smelting method, wherein Mm is misch metal and comprises, by weight, 82.3% of La and 17.7 % of Nd. After the parent alloy ingot is smashed mechanically, ball milling is carried out for 60-90 minutes at the rotation speed of 250-300 turns per minute, then the ground alloy ingot is screened to be AB3-type alloy powder of 200-300 meshes, the prepared alloy powder is placed in fluorination liquid, the fluorination liquid comprises 0.02-0.10 ml of HF and 0.15 g of NaF each liter, the mixture is stirred for 8-15 minutes at the temperature of 40-60 DEG C, and NaBH4 solution of 0.04-0.06 mol / L is added until hydrogen bubbles disappear completely. The obtained alloy powder is washed sequentially by deionized water and absolute ethyl alcohol and is dried for 6-10 hours at the temperature of 60 DEG C in a vacuum environment, and the modified alloy is prepared. An electrode made by the modified alloy has good circulating stability and excellent dynamic performance.

Description

technical field [0001] The invention belongs to the field of material chemistry and electrochemical research, in particular to the effect of fluorination treatment on AB 3 Type hydrogen storage alloy Mm 0.78 Mg 0.22 Ni 2.48 mn 0.09 Al 0.23 co 0.47 (Mm is mixed rare earth, composition: 82.3% La and 17.7% Nd by weight) method for surface modification. Background technique [0002] As people's awareness of environmental protection increases, many researchers use nickel-metal hydride batteries as power sources for electric vehicles and hybrid vehicles. The widespread application of electric vehicles has an important impact on the air quality of cities, national energy independence and international trade balance, and efficient batteries are the technical key to the development of practical electric vehicles. Ni-MH batteries are widely used in electric vehicles due to their advantages of high energy density, high power, long life, corrosion resistance, wide operating tempe...

Claims

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Application Information

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IPC IPC(8): B22F1/00H01M4/38
CPCY02E60/10
Inventor 黄红霞李国辉王新颖
Owner GUILIN UNIVERSITY OF TECHNOLOGY
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