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LiNH2-metal amide/metal hydride composite hydrogen storage material and preparation method thereof

A technology of metal amides and hydrogen storage materials, applied in chemical instruments and methods, non-metallic elements, hydrogen, etc., can solve the problems of poor charge-discharge cycle stability, fast capacity decay, high operating temperature, etc., shorten the grinding time and reduce the reaction Kinetic obstacle, effect of improving work efficiency

Pending Publication Date: 2020-09-22
世能氢电科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the current solid-state hydrogen storage materials generally have problems such as poor charge-discharge cycle stability, fast capacity decay, and high operating temperature during application.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Under the protective atmosphere of inert gas argon, the LiNH 2 and Mg(NH 2 ) 2 According to the molar ratio of 2:1, add it into the grinding tank of the electromagnetic grinder, and the grinding tank is equipped with a magnetic grinding needle, LiNH 2 and Mg(NH 2 ) 2 The mass ratio of the mixed material to the magnetic grinding needle is 1:20, the grinding chamber is sealed, the parameters of the grinding machine are set, the grinding frequency is set to 1800rpm, the interval between forward and reverse operation is 0.5h, the electromagnetic grinding machine is turned on, and the magnetic grinding is driven after power on The needle makes a high-speed 360-degree rotating motion and collides with the material for high-speed grinding. After grinding for 30 hours, turn off the grinder, separate the material in the grinding chamber with a magnetic object, and extract the product to obtain a composite hydrogen storage material.

Embodiment 2

[0024] Under the protective atmosphere of inert gas argon, the LiNH 2 and LiH are added into the grinding tank of the electromagnetic grinding machine according to the molar ratio of 2:1. The grinding tank is equipped with a magnetic grinding needle, and LiNH 2 The mass ratio of the mixed material with LiH to the magnetic grinding needle is 1:30, the grinding chamber is airtight, set the parameters of the grinding machine, the grinding frequency is set to 2000rpm, the interval between forward and reverse operation is 0.5h, and the electromagnetic grinding machine is turned on. The magnetic grinding needle makes a high-speed 360-degree rotating motion and collides with the material for high-speed grinding. After grinding for 25 hours, turn off the grinder, separate the material in the grinding chamber with a magnetic object, and extract the product to obtain a composite hydrogen storage material.

Embodiment 3

[0026] Under the protective atmosphere of inert gas argon, the LiNH 2 and MgH 2 According to the molar ratio of 2:1, add it into the grinding tank of the electromagnetic grinder, and the grinding tank is equipped with a magnetic grinding needle, LiNH 2 and MgH 2 The mass ratio of the mixed material to the magnetic grinding needle is 1:20, the grinding chamber is sealed, set the parameters of the grinding machine, the grinding frequency is set to 2500rpm, the interval between forward and reverse operation is 0.5h, the electromagnetic grinding machine is turned on, and the magnetic grinding is driven after power on The needle makes a high-speed 360-degree rotating motion and collides with the material for high-speed grinding. After grinding for 20 hours, turn off the grinder, separate the material in the grinding chamber with a magnetic object, and extract the product to obtain a composite hydrogen storage material.

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Abstract

The invention belongs to the technical field of hydrogen storage materials, and particularly relates to a LiNH2-metal amide / metal hydride composite hydrogen storage material and a preparation method thereof. The composite hydrogen storage material is formed by compounding LiNH2 and metal amide or metal hydride, and the molar ratio of LiNH2 to metal amide or metal hydride is (1-3): 1. The hydrogenstorage of a Li-Mg-N-H product generated by the invention depends on the migration of small flowing ions such as Li<+>, H+ and H-, so that the reaction has relatively rapid dynamics, and the system shows lower enthalpy and entropy. Meanwhile, the dehydrogenation control step of the system is diffusion of movable small ions, so that the operating temperature is further reduced, and the hydrogen absorption / desorption rate of the amide / hydride combined material is increased. The composite hydrogen storage material is prepared by grinding the material at a high speed by adopting a magnetic grinding machine, and the grinding time can be greatly shortened, so that the working efficiency is improved.

Description

technical field [0001] The invention belongs to the technical field of hydrogen storage materials, in particular to a LiNH 2 -Metal amide / metal hydride composite hydrogen storage material and preparation method thereof. Background technique [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 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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B3/00
CPCC01B3/0078Y02E60/32
Inventor 付强王鸣张方吕俊囡杨昆秦宏云于如军杨列宁夏先畅陈霞
Owner 世能氢电科技有限公司
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