Mg/Ni/In hydrogen storage material and preparation method thereof

A hydrogen storage material, mg2-xniinx technology, applied in chemical instruments and methods, hydrogen, inorganic chemistry, etc., can solve the problems of inconvenient transportation, long preparation period, limited commercial application, etc., to prolong the pulverization time and improve the cycle. The effect of stability

Active Publication Date: 2022-03-11
HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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AI-Extracted Technical Summary

Problems solved by technology

Although the application of the above methods has played a certain role in improving performance, the cycle stability and anti-powdering ability of the hydrogen storage materials currently studied need...
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Method used

The HRD value (high rate discharge capacity) of the hydrogen storage material prepared by embodiment 1~5 and comparative example 1 is as shown in table 5, as can be seen from table 5 under the higher discharge capacity of 400mAh/g, The HRD value of Example 5 is 30.56%, and the HRD value of Comparative Example 1 is 16.71%, which shows that the addition of In element is beneficial to the improvement of the high-rate discharge performance of the hydrogen storage material.
[0090] Jade software is used to calculate the unit cell data (a, c, c/a, V) of the alloy main phase Mg2Ni in the hydrogen storage material prepared in Examples 1 to 5 and Comparative Example 1, and the results are shown in Table 1. It can be seen from Table 1 that, compared with Comparative Example 1, the unit cell volumes of the hydrogen storage materials prepared in Examples 1-5 all increased to varying degrees. It can be seen that the addition of In element increases the volume of the unit cell of the hydrogen storage alloy, and the lattice gap increases accordingly. When charging and discharging, the degree of expansion and contraction of the hydrogen atoms entering and leaving the lattice is reduced, which is beneficial to prolong the power of the powder. time, and improve the cycle stability of the material.
[0093] Calculate the Mg2Ni phase (203) crystal plane of the diffraction peak full width at half maximum (FWHM), the results are shown in Table 2. It can be seen from Table 2 that compared with Comparative Example 1, the FWHM values ​​of the Mg2Ni phase (203) crystal planes in the hydrogen storage materials prepared in Examples 1 to 5 are all reduced. It can be seen that the addition of In element makes the Mg2...
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Abstract

The invention relates to the technical field of hydrogen storage materials, and particularly discloses an Mg/Ni/In hydrogen storage material and a preparation method thereof. The general formula of the hydrogen storage material is Mg2-xNiInx, wherein x is more than 0 and less than or equal to 0.25. The hydrogen storage material is prepared from the blocky Mg ingot, and the Mg2Ni-based hydrogen storage alloy with a layered structure is prepared by adopting a solid-phase diffusion method, so that Mg is replaced by In, and the performance of the Mg2Ni alloy is improved. According to the prepared hydrogen storage material, due to the addition of the element In, the unit cell volume of the main phase Mg2Ni is increased, the lattice gap is increased accordingly, the expansion and contraction degrees of the main phase Mg2Ni are reduced when hydrogen atoms enter and exit lattices during charging and discharging, the pulverization time is prolonged, and the cycle stability of the hydrogen storage material is improved.

Application Domain

Hydrogen

Technology Topic

Cyclic stabilityPhase diffusion +3

Image

  • Mg/Ni/In hydrogen storage material and preparation method thereof
  • Mg/Ni/In hydrogen storage material and preparation method thereof
  • Mg/Ni/In hydrogen storage material and preparation method thereof

Examples

  • Experimental program(5)
  • Comparison scheme(1)
  • Effect test(4)

Example Embodiment

[0043] Example 1
[0044] The embodiment of the present invention provides a hydrogen storage material, and the chemical formula of the hydrogen storage material is mg. 1.95 Niin 0.05.
[0045] The preparation method of the above hydrogen storage material includes the following steps:
[0046] Step 1, the Mg ingot is weighed according to the above raw material ratio, analyzed pure Ni powder and analyzed pure in powder;
[0047] Step Second, the Ni powder and IN powder were mixed with a mixed powder, and then anhydrous ethanol was added, and the ultrasound was dispersed under power 180 W for 12 min, then the temperature was dried under 50 ° C for 2 h, and the powder was pretreated. The mass ratio of anhydrous ethanol and the mixed powder is 20: 1;
[0048] Step three, the pre-treatment powder is uniformly covered on the MG ingot, pressed for 30 min, and the magnesium-based material is pressed under conditions of 25 MPa;
[0049] Step 4, under argon gas conditions, the magnesium-based material was placed in the tubular heat accumulation furnace and heated at a temperature of 10 ° C / min to 550 ° C for 4 h, cooled to room temperature, and the mg / Ni / in hydrogen storage material.

Example Embodiment

[0050] Example 2
[0051] The embodiment of the present invention provides a hydrogen storage material, and the chemical formula of the hydrogen storage material is mg. 1.9 Niin 0.1.
[0052] The preparation method of the above hydrogen storage material includes the following steps:
[0053] Step 1, the Mg ingot is weighed according to the above raw material ratio, analyzed pure Ni powder and analyzed pure in powder;
[0054] Step 2, mixing the Ni powder and IN powder, then mixed with anhydrous ethanol, and dispersed for 10 min under power 200 W, then dried at 45 ° C for 2.5 h, pretreatment powder, where the The mass ratio of anhydrous ethanol and the mixed powder is 18: 1;
[0055] Step three, the pre-treatment powder is uniformly covered on the MG ingot, pressed 35 min under conditions of 23 MPa, and magnesium-based materials;
[0056] Step 4 and under argon gas conditions, the magnesium-based material was placed in the tubular heat accumulation furnace and heated at 860 ° C for 3.5 h at 860 ° C for 3.5 h, and the mg was cooled to room temperature. / Ni / IN hydrogen storage material.

Example Embodiment

[0057] Example 3
[0058] The embodiment of the present invention provides a hydrogen storage material, and the chemical formula of the hydrogen storage material is mg. 1.85 Niin 0.15.
[0059] The preparation method of the above hydrogen storage material includes the following steps:
[0060] Step 1, the Mg ingot is weighed according to the above raw material ratio, analyzed pure Ni powder and analyzed pure in powder;
[0061] Step 2, the Ni powder and IN powder were mixed with the powder, then anhydrous ethanol was added, and the ultrasound was dispersed under the conditions of the power 190 W, and then the temperature was dried at 55 ° C for 1.5 h, and the powder was pretreated. The mass ratio of anhydrous ethanol and the mixed powder is 22: 1;
[0062] Step three, the pretreatment powder is uniformly covered on the MG ingot, pressed 25 min under conditions of 27 MPa, and magnesium-based materials;
[0063] Step 4, under argon gas conditions, the magnesium-based material is placed in the tube heat release furnace and heated at a temperature of 12 ° C / min to 530 ° C for 4.5 h, and the furnace is cooled to room temperature, and the mg is obtained. / Ni / IN hydrogen storage material.
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PUM

PropertyMeasurementUnit
Discharge capacity54.98mAh/g
tensileMPa
Particle sizePa
strength10

Description & Claims & Application Information

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Classification and recommendation of technical efficacy words

  • Improve cycle stability
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