Lithium borohydride/rare earth magnesium base alloy composite hydrogen storage material and preparation method thereof

A technology of lithium borohydride and hydrogen storage materials, which is applied in the field of lithium borohydride/rare earth magnesium-based alloy composite hydrogen storage materials and its preparation, can solve problems such as complicated operation, unsuitable for large-scale sample preparation, and difficult to meet practical applications. Achieve the effect that the preparation method is simple and easy

Active Publication Date: 2013-05-15
GUANGDONG INST OF RARE METALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although some of the above methods have incorporated LiBH 4 However, it is still difficult to meet the practical application of this type of alloy, and some methods are complicated to operate and not suitable for large-scale sample preparation.

Method used

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  • Lithium borohydride/rare earth magnesium base alloy composite hydrogen storage material and preparation method thereof
  • Lithium borohydride/rare earth magnesium base alloy composite hydrogen storage material and preparation method thereof
  • Lithium borohydride/rare earth magnesium base alloy composite hydrogen storage material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] According to the alloy composition ratio, the rare earth elements and metals were prepared in the form of simple substances. 0.3 Mg 0.7 Ni 3.2 co 0.2 mn 0.2 Al 0.2 Alloy, the purity of the raw material is above 99.5%. The prepared raw material is vacuumed to 0.05Pa in a vacuum quenching furnace, and then protected by argon, smelted and thrown into a hydrogen storage alloy sheet of 0.05~0.10mm. The alloy sheet is 900 Heat treatment at ℃ for 4 hours, after cooling, ball milling, passing through a 200-mesh sieve to obtain hydrogen storage alloy powder with a particle size of less than 0.08mm. The obtained alloy is flaked alloy.

[0019] Commercially available LiBH 4 La 0.3 Mg 0.7 Ni 3.2 co 0.2 mn 0.2 Al 0.2 After the alloy is mixed according to the mass ratio of 4:1, add the heptane solution according to the ratio of the total mass of the mixed powder (g): the volume of the solution (ml) = 1:1, ball mill for 24 hours under the protection of argon, and freeze-dr...

Embodiment 2

[0023] Rare earth elements and metals are prepared in the form of simple substances according to the alloy composition ratio 0.5 Mg 0.4 Ni 3 co0.5 mn 0.4 Al 0.4 Alloy, the purity of the raw material is above 99.5%. The prepared raw material is vacuumed to 0.05Pa in a vacuum quenching furnace, and then protected by argon, smelted and thrown into a hydrogen storage alloy sheet of 0.05~0.10mm. The alloy sheet is 800 Heat treatment at ℃ for 6 hours, after cooling, ball milling, passing through a 200-mesh sieve to obtain hydrogen storage alloy powder with a particle size of less than 0.08mm. The obtained alloy powder was hydrogenated under a hydrogen pressure of 3 MPa to obtain a hydrogenated alloy.

[0024] Commercially available LiBH 4 After the powders are mixed at a mass ratio of 1:1, add 3ml of hexane solution according to the ratio of the total mass of the mixed powder (g): solution volume (ml) = 1:3, ball mill for 24 hours under the protection of argon, and test after f...

Embodiment 3

[0026] Rare earth elements and metals are prepared in the form of simple substances according to the alloy composition ratio 0.8 Mg 0.2 Ni 2.8 co 0.8 mn 0.3 Al 0.1 Alloy, the purity of the raw material is above 99.5%, the prepared raw material is vacuumed to 0.05Pa in a vacuum quenching furnace, then protected by argon gas, the pressure is about 0.05MPa, melted and thrown into a hydrogen storage alloy sheet of 0.05~0.10mm , the alloy flakes were heat treated at 1000°C for 2 hours, after cooling, they were milled into powder and passed through a 200-mesh sieve to obtain hydrogen storage alloy powder with a particle size of less than 0.08mm, and the obtained alloy was flaked alloy.

[0027] Commercially available LiBH 4 After the powders were mixed in a mass ratio of 1:4, 1ml of tetrahydrofuran solution was added according to the ratio of total mass of mixed powder (g): solution volume (ml) = 1:2, ball milled for 24 hours under the protection of argon, and tested after free...

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Abstract

The invention discloses a lithium borohydride/rare earth magnesium base alloy composite hydrogen storage material which consists of lithium borohydride and rare earth magnesium base alloy, wherein the general formula is LiBH4/La(1-x)MgxNiaCobMncAld; the rare earth magnesium base alloy accounts for 10-80% of the composite material by mass; and x is 0.1-0.8, a is 2.7-3.2, b is 0.1-0.8, c is 0.1-0.4 and d is 0.05-0.5. The lithium borohydride/rare earth magnesium base alloy composite hydrogen storage material is prepared by the following steps of: smelting according to the proportion of the components and tossing to obtain an alloy sheet; after heat treatment and cooling, performing ball milling and sieving to obtain tossing-state alloy powder; performing hydrogen treatment of the tossing-state alloy powder to obtain hydrogenated-state alloy powder; mixing LiBH4 and alloy powder according to a mass proportion; adding heptane, hexane or tetrahydrofuran, and performing ball milling; and freeze-drying to obtain the lithium borohydride/rare earth magnesium base alloy composite hydrogen storage material. The lithium borohydride/rare earth magnesium base alloy composite hydrogen storage material disclosed by the invention has high mass hydrogen storage density, and the preparation method is simple and easy to implement. The composite material can be widely applied to the fields such as large-scale transportation of hydrogen, hydrogen supply source of fuel cell, purification of hydrogen and the like.

Description

technical field [0001] The invention relates to a lithium borohydride / rare earth magnesium-based alloy composite hydrogen storage material and a preparation method thereof. The composite hydrogen storage material provided has good low-temperature hydrogen desorption performance and belongs to the field of hydrogen storage materials. Background technique [0002] Future transportation tools based on hydrogen fuel cells need to develop a more efficient and reliable hydrogen storage method to provide hydrogen sources for fuel cells. Solid material hydrogen storage is generally considered to be a hydrogen storage method superior to high-pressure gaseous hydrogen storage, low-temperature liquid hydrogen storage, and physical adsorption hydrogen storage. Nevertheless, there is currently no hydrogen storage material that can fully meet the hydrogen storage standards proposed by the U.S. Department of Energy, that is, store 5.5wt.% (mass ratio, the same below) hydrogen at relatively...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B3/02C22C19/03C22C29/00C22C32/00C22C30/00C22C1/02C22C1/05
Inventor 孙泰肖方明唐仁衡王英李伟肖志平
Owner GUANGDONG INST OF RARE METALS
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