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Preparation method of hydrogen storage alloy material

A hydrogen storage alloy and raw material solution technology, applied in the field of alloy materials, can solve the problems of uneven composition, high production cost, and many alloy defects, and achieve the effect of simple synthesis method, no segregation, and uniform alloy composition

Inactive Publication Date: 2012-07-18
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation of hydrogen storage alloys by these methods needs to use simple metals as raw materials, the production cost is high, and the prepared alloy has many defects and uneven composition.

Method used

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  • Preparation method of hydrogen storage alloy material
  • Preparation method of hydrogen storage alloy material
  • Preparation method of hydrogen storage alloy material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] First, the La 2 o 3 The powder is burned to remove water and adsorbates, and dissolved in nitric acid with a volume ratio of 1:1 (the ratio of distilled water follows) to prepare La(NO 3 ) 3Solution, dissolving magnesium salt, nickel salt and cobalt salt in distilled water to prepare a solution containing Mg, Ni and Co. Taking the prepared product 8g as the standard, according to the product La 0.67 Mg 0.33 Ni 2.5 co 0.5 The atomic ratio of each metal salt solution is accurately pipetted in a beaker, wherein the La element is over 25%. At this time, the total content of each metal ion in the metal salt mixed solution is 37g / L, which is placed in a constant temperature water bath, and quickly Stir, and after the temperature is constant, quickly drop 250 mL of 0.5 mol / L oxalic acid-ethanol solution (the amount added is 150% of the theoretical amount) with an acid burette. After the precipitation is complete, age the solution, then wash the precipitate, filter, dry....

Embodiment 2

[0029] With the same raw material solution among the embodiment 1, take preparation product 8g as standard, press product La 0.7 Mg 0.3 Ni 2.8 co 0.5 The atomic ratio of each metal salt solution is accurately pipetted in a beaker, wherein the La element is excessive by 25%. At this time, the total content of each metal ion in the metal salt mixed solution is 37.6g / L, which is placed in a constant temperature water bath. Stir rapidly, and after the temperature is constant, quickly add 248 mL of 0.6 mol / L oxalic acid-ethanol solution (the amount added is 150% of the theoretical amount) dropwise with an acid burette. After the precipitation is complete, age the solution, and then wash the precipitate for 3- 6 times, filter, dry, burn to get La 0.7 Mg 0.3 Ni 2.8 co 0.5 Alloy oxide precursor, and then the oxide and CaH 2 mixed, CaH 2 The amount is 2 times of the theoretical value, placed in a vacuum / atmosphere tube electric furnace for reduction, and the resulting reduced p...

Embodiment 3

[0031] With the same raw material solution among the embodiment 1, take preparation product 8g as standard, press product La 0.75 Mg 0.25 Ni 3.2 co 0.3 The atomic ratio of each metal salt solution is accurately pipetted in a beaker, wherein the La element is excessive by 25%. At this time, the total content of each metal ion in the metal salt mixed solution is 40g / L, which is placed in a constant temperature water bath, Stir quickly, and after the temperature is constant, quickly add 247mL of 0.7mol / L oxalic acid-ethanol solution dropwise with an acid burette (the amount added is 150% of the theoretical amount), after the precipitation is complete, age the solution, and then wash the precipitate for 3~ 6 times, filter, dry, burn to get La 0.75 Mg 0.25 Ni 3.2 co 0.3 Alloy oxide precursors. The atomic ratio of each metal element is consistent with the set composition through X-ray fluorescence probe detection, and the X-ray results show that it is in a good crystal state,...

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Abstract

The invention discloses a preparation method of a hydrogen storage alloy material. A structural formula of the material is ABx(x=3.0-3.5), wherein a chemical constituent of an element on A side is Lz1-yMgy, and y is 0.25-0.33; and B is NipCoz (Mn Al3)w, p is 2.5-3.3, z is 0-0.5, and w is 0-0.1. The preparation method comprises the following steps of: (1) adopting oxalic acid-ethanol solution as a precipitator, taking saline solution of rare earth, magnesium, nickel and various doped metal as raw materials, preparing a precipitate, and washing, filtering, drying and firing the precipitate to obtain an alloy oxide precursor; and (2) taking calcium hydride as reducing agent, and high-purity hydrogen as reducing atmosphere, carrying out reduction in a vacuum / atmosphere tubular furnace, and rinsing, soaking, washing and drying the reduzate to obtain hydrogen storage alloy powder. According to the preparation method, the rare earth oxide and metal salt are adopted as the raw materials, so that the adoption of expensive pure metal is avoided, the cost can be obviously reduced, the prepared alloy powder has mall granularity, the compositions are uniform, the discharge capacity is high, the performance is stable, and the hydrogen storage alloy material can be used as a negative active material of a large-power nickel-hydrogen battery.

Description

technical field [0001] The invention belongs to the technical field of alloy materials, and relates to a hydrogen storage alloy material, in particular to a preparation method of La-Mg-Ni series hydrogen storage alloy powder. Background technique [0002] At present, hydrogen energy is the cleanest secondary energy source and one of the important new energy sources in the 21st century. It is considered to be an ideal choice to replace fossil energy sources. Its cheap production, storage and transportation have become important research topics today. The discovery, development and application of hydrogen storage materials have promoted the development and utilization of hydrogen energy. As an excellent hydrogen storage material, metal hydrides can reversibly absorb and release a large amount of hydrogen. An important carrier with broad application prospects. Hydrogen storage alloy is an alloy material that can store a large amount of hydrogen atoms in the gaps of crystals. T...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C19/03C22C1/04
Inventor 朱文谭聪
Owner HUAZHONG UNIV OF SCI & TECH
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