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Doped LiMgN/LiH hydrogen storage material and preparation method therefor

A technology for hydrogen storage materials and raw materials, which is applied in the field of doped LiMgN/LiH hydrogen storage materials and its preparation, can solve the problems of low LiMgN phase content, only 3.2wt% hydrogen storage capacity, and inability to obtain products, etc. Appearance rules, improvement of initial hydrogen absorption temperature, and convenient operation.

Active Publication Date: 2015-11-25
ADVANCED TECHNOLOGY & MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

People mainly through Li 3 N and Mg 3 N 2 LiMgN is prepared by high-temperature sintering of raw materials (such as: H.Yamane, T.H.Okabe, O.Ishiyama, Y.Waseda, M.Shimada, TernarynitridespreparedintheLi 3 N–Mg 3 N 2 systemat900–1000K, Journal of Alloys and Compounds, Volume319, April2001, 124–130); in addition, some people passed LiNH 2 and MgH 2 The raw material is ball milled, and the product after ball milling is dehydrogenated to prepare LiMgN (such as: J.Lu, Z.Z.Fang, Y.J.Choi, H.Y.Sohn, J.Phys.Chem.C2007, 111, 12129-12134), but this method has been Controversy, the same product cannot be obtained due to different ball milling processes, and the LiMgN phase content in the obtained product is relatively low
Lithium nitride (Li 3 N) and magnesium hydride (MgH 2 ) mixed ball milling at a ratio of 1:1 can prepare LiMgN and LiH mixed phases, and the phase content of LiMgN can reach about 73wt%, and the preparation process is simple, but its hydrogen storage capacity is only 3.2wt%, so it is necessary to further improve the nitriding Lithium (Li 3 N) and magnesium hydride (MgH 2 ) hydrogen storage properties of LiMgN / LiH mixed phase

Method used

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  • Doped LiMgN/LiH hydrogen storage material and preparation method therefor
  • Doped LiMgN/LiH hydrogen storage material and preparation method therefor
  • Doped LiMgN/LiH hydrogen storage material and preparation method therefor

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Embodiment 1

[0019] This embodiment includes the preparation of six hydrogen storage materials, and the specific preparation methods are as follows:

[0020] According to the raw material and additive M dosage relationship in Table 1, the mixed raw materials used in Examples 1-1 to 1-VI were prepared, and then six parts of the mixed raw materials were put into a 250ml ball mill tank for mechanical ball milling. The weight ratio of the mixed raw materials is 40:1, filled with 2bar argon (Ar) for protection, the ball milling speed is 500rpm, the ball milling time is 12h, and the ball milling process every 10min rests for 5 minutes to prevent the ball mill tank from overheating the sample during the ball milling process MgH 2 Decomposition occurs, and the ball milled product is the hydrogen storage material. Among them, the ball milled product of Example 1-1 is the hydrogen storage material that is not doped with M, that is, the reference material, and the Example 1-II to Example 1-VI are the mat...

Embodiment 2

[0028] The raw material Li 3 N, MgH 2 And additive LiNH 2 Mix according to the molar ratio of 1:1:2. After mixing evenly, prepare the hydrogen storage material LiMgN-LiH-LiNH according to the ten ball milling processes shown in Table 2. 2 , The entire ball milling process is filled with 2bar argon (Ar) for protection, and during the ball milling process, every 10 minutes of ball milling and rest for 5 minutes, the ball milled product is LiMgN-LiH-LiNH 2 Hydrogen storage materials.

[0029] The hydrogen absorption performance of ten kinds of hydrogen storage materials prepared by ball milling process were tested. The test equipment was a hydrogen storage tester (model: PCT-1SPWIN). The initial hydrogen absorption pressure was 10MPa (100bar) hydrogen pressure, and the heating rate was 2℃ / min, the results are shown in Table 2 and Figure 5 . From Figure 5 It can be seen that the initial hydrogen absorption temperature of the hydrogen storage material prepared in Example 2-Ш is 90...

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Abstract

The invention discloses a doped LiMgN / LiH hydrogen storage material and a preparation method therefor, and belongs to the technical field of hydrogen storage materials. According to the preparation method for the LiMgN / LiH hydrogen storage material, namely LiMgN-LiH-M (M being Ti, TiCl3 or LiNH2), mechanical alloying is carried out on raw materials by using a high energy ball milling process. The hydrogen storage material obtained by the preparation method disclosed by the invention has the advantages of being regular in shape, uniform in dimension, relatively high in hydrogen storage density, relatively quick in dynamics performance and the like.

Description

Technical field [0001] The invention relates to the field of hydrogen storage materials for fuel cells, in particular to a doped LiMgN / LiH hydrogen storage material and a preparation method thereof. Background technique [0002] With the energy crisis and environmental deterioration, hydrogen energy is regarded as an ideal clean energy in the future, and hydrogen storage materials related to hydrogen energy technology have also attracted widespread attention at home and abroad. The goal of the development of hydrogen storage materials is to explore a new generation of hydrogen storage materials with high hydrogen storage capacity and good overall performance. Metal-NH hydrogen storage material is a new type of high-capacity hydrogen storage material developed in recent years. It has excellent reversible hydrogen absorption and release performance and more suitable hydrogen absorption and release thermodynamic properties. It is also a few hydrogen storage materials with more devel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B3/02
Inventor 武英张宝阎有花高慧周少雄
Owner ADVANCED TECHNOLOGY & MATERIALS CO LTD