La-mg-ni series hydrogen storage alloy for nickel-hydrogen battery and preparation method thereof

A technology for hydrogen storage alloys and nickel-metal hydride batteries, which is applied to battery electrodes, circuits, electrical components, etc., can solve the problem that it is difficult to further improve the stability of charge and discharge cycles, and achieve improved electrochemical kinetics and cycle stability performance, The effect of high maximum discharge capacity, good kinetic performance and cycle stability

Active Publication Date: 2019-01-15
ADVANCED TECHNOLOGY & MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current industrialized AB 5 Type hydrogen storage alloy is the most widely used negative electrode material for Ni / MH batteries, but the discharge capacity of its alloy electrode is close to the theoretical maximum discharge capacity of 340mAh / g, and it is difficult to further improve the charge-discharge cycle stability.
La-Mg-Ni hydrogen storage alloy Ni / MH battery has a series of advantages such as high energy density (theoretical capacity reaches 410mAh / g), high-rate charge and discharge performance, and good activation performance, but it still needs to further improve its cycle stability. Only in order to meet the needs of practical applications

Method used

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  • La-mg-ni series hydrogen storage alloy for nickel-hydrogen battery and preparation method thereof
  • La-mg-ni series hydrogen storage alloy for nickel-hydrogen battery and preparation method thereof
  • La-mg-ni series hydrogen storage alloy for nickel-hydrogen battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-4

[0030] See Table 1 for the components and contents of the alloys in Examples 1-4. Table 1 shows the theoretical formulation of the alloy, the actual values ​​for compensating for the volatilization of lanthanum and magnesium, and the representative formula of the alloy.

[0031] The specific preparation method is as follows:

[0032](1) Ingredients: Commercial high-purity metal raw materials are used, which are respectively 99.5% pure lanthanum (La) block, 99.94% pure magnesium ingot (Mg), 99.96% pure electrolytic nickel (Ni) block, 99.95% pure Pure cobalt flakes (Co), 99.5% aluminum bulk (Al) and 99% molybdenum grains (Mo). Prepare materials according to the contents in Table 1; cut the magnesium ingot into small pieces of magnesium, wherein the size of the small pieces of magnesium (length×width×height) is less than 2×2×1cm.

[0033] (2) Melting: Put the materials prepared in step (1) into the alumina crucible in a certain order, wherein molybdenum particles and nickel are ...

Embodiment 5

[0074] In Examples 5-7, except that the annealing temperature is different from that of Example 3, the process parameters for preparing other alloys and the testing methods of alloy electrode performance are the same as those of Example 3, wherein the annealing temperature of Example 5 is 800°C, and the method of Example 6 is The annealing temperature in Example 7 was 850°C, and the annealing temperature in Example 7 was 950°C. The electrochemical properties of the obtained alloy electrodes are shown in Table 3 below.

[0075] The electrochemical performance data of table 3 embodiment 5-7 alloy electrode

[0076]

[0077] Considering the electrochemical properties of Examples 1-7, Example 3 is the annealed 900°C*8h alloy electrode La 0.75 Mg 0.25 Ni 3.05 co 0.20 al 0.10 Mo 0.15 While maintaining a high discharge capacity, the cycle stability and high-rate discharge performance of the alloy electrode are also greatly improved, so it has the best comprehensive electroche...

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Abstract

The invention discloses La-Mg-Ni-based hydrogen storage alloy for a nickel-metal hydride battery and a preparation method of the La-Mg-Ni-based hydrogen storage alloy. The chemical expression of the La-Mg-Ni-based hydrogen storage alloy is La0.75Mg0.25Ni3.2-xCo0.2Al0.1Mox, and the La-Mg-Ni-based hydrogen storage alloy belongs to A2B7 type La-Mg-Ni-based hydrogen storage alloy, wherein 0<=x<=0.2. The preparation method comprises the steps of proportioning, smelting and annealing treatment. When the La-Mg-Ni-based hydrogen storage alloy serves as a negative electrode material of the nickel-metal hydride battery, the La-Mg-Ni-based hydrogen storage alloy has the advantages that high maximum discharge capacity is maintained, and good dynamics performance and cycling stability are achieved.

Description

technical field [0001] The invention relates to a La-Mg-Ni series hydrogen storage alloy for a nickel-hydrogen battery and a preparation method thereof, belonging to the technical field of hydrogen storage materials. Background technique [0002] Since the 21st century, hydrogen energy has been regarded as the clean energy with the most development potential. As early as more than 200 years ago, human beings had a strong interest in the application of hydrogen energy. Until the 1970s, many countries and regions in the world began to It has set off an upsurge in hydrogen energy research. Using the reversible hydrogen absorption and desorption properties of hydrogen storage materials and the accompanying thermal effects and equilibrium pressure characteristics, energy exchange such as chemical energy, thermal energy and mechanical energy can be carried out. Specifically, it can be used for efficient storage and transportation of hydrogen, battery negative electrode materials, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C28/00C22C30/00H01M4/38
CPCC22C28/00C22C30/00H01M4/385Y02E60/10
Inventor 武英李维张宝原建光阎有花况春江周少雄
Owner ADVANCED TECHNOLOGY & MATERIALS CO LTD
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