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A kind of lithium sodium double alkali metal aluminum hydride compound and its synthetic method

A synthesis method and alkali metal technology, applied in the field of lithium sodium double alkali metal aluminum hydride and its synthesis, can solve the problems of dehydrogenation rate to be improved, poor hydrogen absorption kinetics, high initial dehydrogenation temperature, etc., to achieve absorption and release Effects of increased hydrogen rate, low molecular weight, and reduced initial dehydrogenation temperature

Active Publication Date: 2019-04-30
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, LiAlH 4 Irreversible, NaAlH 4 Although it is reversible, its hydrogen absorption kinetics performance is poor, and the reversible conditions are relatively harsh, which has become a bottleneck restricting its popularization and application.
LiNa 2 H 6 Good reversibility, but its initial dehydrogenation temperature is relatively high, and the dehydrogenation rate needs to be improved

Method used

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  • A kind of lithium sodium double alkali metal aluminum hydride compound and its synthetic method
  • A kind of lithium sodium double alkali metal aluminum hydride compound and its synthetic method
  • A kind of lithium sodium double alkali metal aluminum hydride compound and its synthetic method

Examples

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Effect test

example 1

[0031] Li will be prepared 3 H 6 with Na 3 H 6 The powder was mixed according to the Li-Na molar ratio of 0.9:2.1, and put into a ball mill jar under an argon atmosphere, in which the balls were mixed with Li 3 H 6 Powder and Na 3 H 6 The ratio of the total mass of the two powders is 30:1. Afterwards, the ball mill jar was loaded on the star ball mill, and the Li 0.9 Na 2.1 H 6 Powder, determined by XRD test Li 0.9 Na 2.1 H 6 Pure phase, test its hydrogen storage performance according to the above method, and the dehydrogenation temperature is 210 ° C ~ 260 ° C.

example 2

[0033] Li will be prepared 3 H 6 with Na 3 H 6 The powder was mixed according to the Li-Na molar ratio of 1.0:2.0, and put into a ball mill jar under an argon atmosphere, in which the balls were mixed with Li 3 H 6 Powder and Na 3 H 6 The ratio of the total mass of the two powders is 40:1. Afterwards, the ball mill jar was loaded on the star ball mill, and the Li 1.0 Na 2.0 H 6 Powder, determined by XRD test Li 1.0 Na 2.0 H 6 Pure phase, test its hydrogen storage performance according to the above method, and the dehydrogenation temperature is 210 ° C ~ 260 ° C.

example 3

[0035] Li will be prepared 3 H 6 with Na 3 H 6 The powder was mixed according to the Li-Na molar ratio of 1.1:1.9, and put into a ball mill jar under an argon atmosphere, in which the balls were mixed with Li 3 H 6 Powder and Na 3 H 6 The ratio of the total mass of the two powders is 50:1. Afterwards, the ball mill jar was loaded on the star ball mill, and the Li 1.1 Na 1.9 H 6 Powder, determined by XRD test Li 1.1 Na 1.9 H 6 Pure phase, test its hydrogen storage performance according to the above method, and the dehydrogenation temperature is 210 ° C ~ 260 ° C.

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Abstract

The invention discloses lithium-sodium dual-alkali metal aluminum-hydrogen compound and a synthesis method thereof. The lithium-sodium dual-alkali metal aluminum-hydrogen compound has a single cubic structure and has the chemical formula of LixNa3-xAlH6, wherein x is 0.9-1.3. The lithium-sodium dual-alkali metal aluminum-hydrogen compound has high proportion hydrogen storage capacity and fast hydrogen absorption rate. The preparation method for the lithium-sodium dual-alkali metal aluminum-hydrogen compound comprises the following steps: mixing Li3AlH6 and Na3AlH6 according to the molar ratio of 0.9:2.1-1.3:1.7, and ball-milling for 10-30 h at a speed of 400 rpm-500 rpm, to obtain LixNa3-xAlH6, wherein x is 0.9-1.3; Li toms and Na atoms in the structure occupy gaps of an AlH6 octahedron, and the Li toms and the Na atoms are replaced with each other along with the different ratio of the Li toms and the Na atoms. The method is simple and easy to implement, and is suitable for mass commercial production; the optimum proportion hydrogen storage capacity is high, the initial dehydrogenation temperature is low, and the hydrogen absorption rate is obviously improved.

Description

technical field [0001] The invention relates to a lithium-sodium double alkali metal aluminum hydride compound and a synthesis method thereof, belonging to the field of hydrogen storage materials. technical background [0002] With the rapid development of human society, energy has increasingly become a bottleneck restricting the sustainable development of human beings. Traditional energy materials are mainly fossil energy oil, coal, natural gas and so on. However, with the long-term use of such energy materials, the natural environment has also been severely damaged. Acid rain, smog, greenhouse effect, etc. are inextricably linked to the use of traditional energy materials, and the environment on which human beings depend is constantly under threat. Although renewable energy sources such as wind energy and solar energy have relieved the pressure on the environment brought by fossil energy sources to a certain extent, most renewable energy sources cannot directly meet the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B6/24
CPCC01B6/243C01P2002/72
Inventor 张耀范小路
Owner SOUTHEAST UNIV
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