Novel La-Mg-Ni-series hydrogen storage alloy

A hydrogen storage alloy and alloy technology, which is applied in the field of nickel-hydrogen battery negative electrode hydrogen storage materials and La-Mg-Ni hydrogen storage alloys, can solve the problem of not meeting the requirements of commercial nickel-hydrogen batteries, poor electrode cycle stability, and hindering commercial use. problems such as chemical application, to achieve the effect of improving hydrogen storage capacity and cycle stability, increasing cycle stability, and slowing down corrosion

Inactive Publication Date: 2015-09-16
BAISE UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because the La-Mg-Ni alloy electrode is easily corroded by the alkaline electrolyte, the cycle stability of the electrode is poor, which hinders its commercial application.
In order to improve the performance of La-Mg-Ni alloy electrodes, researchers have done a lot of research, optimizing the element ratio of the alloy by element substitution or improving the preparation process of alloy electrodes by heat treatment and surface treatment, La-Mg-Ni The cycle stability performance of alloy electrodes has been improved to varying degrees, but it still cannot meet the requirements of commercial Ni-MH batteries.

Method used

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  • Novel La-Mg-Ni-series hydrogen storage alloy
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  • Novel La-Mg-Ni-series hydrogen storage alloy

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A. The design alloy composition is La 0.55 PR 0.05 Nd 0.15 Mg 0.25 Ni 3.5 (Co 0.5 al 0.5 ) 0.1

[0023] B. Proportioning each elemental element with a purity of more than 99% according to the molar percentage;

[0024] C. Prepare the alloy designed in step A by magnetic levitation melting. Put all the raw materials into the crucible together, and pass 1×10 into the melting crucible 5 Pa argon, smelting by slowly increasing the smelting power, the smelting power range is 20-2500KW, the smelting time is 2-5min, and the alloy is turned over and remelted 3-4 times during the alloy smelting process to ensure that the alloy composition is uniform. The smelted alloy ingot is polished with sandpaper to remove the surface oxide layer, and then the alloy is mechanically ground and pulverized through a 200-mesh sieve for later use.

[0025] The electrochemical performance of the alloy electrode was tested by the open three-electrode method. Mix 0.3 g of the prepared hyd...

Embodiment 2

[0027] A. The design alloy composition is La 0.55 PR 0.05 Nd 0.15 Mg 0.25 Ni 3.5 (Co 0.5 al 0.5 ) 0.3

[0028] B. Prepare the alloy designed in step A by magnetic levitation melting. Put all the raw materials into the crucible together, and pass 1×10 into the melting crucible 5 Pa argon, smelting by slowly increasing the smelting power, the smelting power range is 20-2500KW, the smelting time is 2-5min, and the alloy is turned over and remelted 3-4 times during the alloy smelting process to ensure that the alloy composition is uniform. The smelted alloy ingot is polished with sandpaper to remove the surface oxide layer, and then the alloy is mechanically ground and pulverized through a 200-mesh sieve for later use.

[0029] The electrochemical performance of the alloy electrode was tested by the open three-electrode method. Mix 0.3 g of the prepared hydrogen storage alloy powder with 1.2 g of nickel hydroxy powder in a mass ratio of 1:4, and press it into a negative ...

Embodiment 3

[0031] A. The design alloy composition is La 0.55 PR 0.05 Nd 0.15 Mg 0.25 Ni 3.5 (Co 0.5 Al 0.5 ) 0.5

[0032] B. Proportioning each elemental element with a purity of more than 99% according to the molar percentage;

[0033] C. Prepare the alloy designed in step A by magnetic levitation melting. Put all the raw materials into the crucible together, and pass 1×10 into the melting crucible 5 Pa argon, smelting by slowly increasing the smelting power, the smelting power range is 20-2500KW, the smelting time is 2-5min, and the alloy is turned over and remelted 3-4 times during the alloy smelting process to ensure that the alloy composition is uniform. The smelted alloy ingot is polished with sandpaper to remove the surface oxide layer, and then the alloy is mechanically ground and pulverized through a 200-mesh sieve for later use.

[0034] The electrochemical performance of the alloy electrode was tested by the open three-electrode method. Mix 0.3 g of the prepared hyd...

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Abstract

The invention discloses a novel La-Mg-Ni-series hydrogen storage alloy with an atomic component composition as shown in the following formula: La0.55Pr0.05Nd0.15Mg0.25Ni3.5 (Co0.5Al0.5) x, wherein x is greater than or equal to 0 but less than or equal to 0.5. The alloy is a negative electrode hydrogen storage material applied to a nickel-metal hydroxide storage battery, and is obtained by substituting La with cerium-rich rear earth as a side A and carrying out multi-component co-substitution on a side B; meanwhile, Co and Al are added into the alloy, so that the hydrogen storage amount of the alloy is increased, the corrosion of the alloy in electrolyte is alleviated, the cycling stability of an alloy electrode is improved, and the product cost is further reduced.

Description

technical field [0001] The invention relates to a negative electrode hydrogen storage material of a nickel-hydrogen battery, in particular to a La-Mg-Ni hydrogen storage alloy, which belongs to the field of battery electrode materials. Background technique [0002] As a clean, efficient and sustainable new energy, hydrogen energy is regarded as the most promising green energy in the 21st century. The development of hydrogen storage technology is one of the key links in the entire hydrogen energy system. It has become a decisive factor for the early realization of the hydrogen economy and directly restricts the healthy development of the world's social economy. Countries around the world pay special attention to the development and utilization of hydrogen storage technology. The development of nickel-metal hydride secondary batteries has effectively promoted the progress of hydrogen storage technology. The most critical material in nickel-metal hydride batteries is the hydro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C19/03C22C1/02
Inventor 覃铭何兵熊凯卢照刘淑辉
Owner BAISE UNIV
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