Method for preparing Li-Mg-N-H hydrogen-storing material

A technology of hydrogen storage materials and nitrides, which is applied in the production of hydrogen and various metal hydrides, can solve the problems of poor cycle stability, high cost, and high dehydrogenation temperature of Li-Mg-N-H hydrogen storage materials. Accelerated hydrogen absorption and desorption, low cost, and improved cycle stability

Inactive Publication Date: 2008-12-31
ZHEJIANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current Li-Mg-N-H hydrogen storage system is prepared from Mg(NH 2 ) 2 and 2LiH or LiNH 2 and MgH 2 Starting, the above synthesis method is due to the use of metal hydrides LiH and MgH 2 As a raw material, the cost of the material is higher
In addition, the Li-Mg-N-H hydrogen storage materials synthesized by the above method still have the disadvantages of high dehydrogenation temperature and poor cycle stability.

Method used

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  • Method for preparing Li-Mg-N-H hydrogen-storing material

Examples

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Effect test

Embodiment 1

[0033] In a glove box filled with Ar gas, the Li 3 N and Mg(NH 2 ) 2 , LiNH 2 and Mg, LiNH 2 and Mg(NH 2 ) 2 , LiNH 2 , Mg and Mg(NH 2 ) 2 Mix according to the molar ratio of 2:3, 1.95:1, 2:1 and 2.5:0.5:0.5 respectively, put them into a sealable stainless steel tank, use argon protection, and carry out mechanical mixing on an automatic mechanical powder mixer. 40:1, rotating speed 90rpm, mixing time 8h. Put the uniformly mixed mixture into the atmosphere type sintering furnace under the condition of isolating the air, protect it with nitrogen flow, nitrogen pressure 2atm, flow rate 100mL / min, sample sintering temperature 250℃, holding time 36h, sintering to prepare Li-Mg -N-H hydrogen storage materials. The molar ratios of the mixed samples and their mixing and sintering preparation conditions are listed in Table 1. The X-ray diffraction test of the samples prepared by sintering found that the samples showed Li 2 MgN 2 h 2 The diffraction pattern. figure 1 As a...

Embodiment 2

[0035] In a glove box filled with Ar gas, LiNH with a molar ratio of 2.05:1 2 and Mg(NH 2 ) 2 The mixture was put into a ball milling tank with an on-off valve. After the ball milling tank was pre-evacuated, it was ball milled and mixed on a planetary ball mill with a ball-to-material ratio of 55:1, a rotating speed of 550 rpm, and a ball milling time of 6 hours. Then, the mixture was placed in an atmosphere sintering furnace under the condition of isolating the air, protected by nitrogen flow, nitrogen pressure 1.6atm, flow rate 70mL / min, sample sintering temperature 280°C, holding time 30h, sintering to prepare Li-Mg-N-H Hydrogen storage material. The mixed sintering preparation parameters of the samples are also listed in Table 1. The X-ray diffraction test of the samples prepared by sintering showed that the product mainly contained Li 2 MgN 2 h 2 Mutually.

Embodiment 3

[0037] In a nitrogen-filled glove box, LiNH with a molar ratio of 2:0.1:0.7 2 and Mg 3 N 2 and Mg(NH 2 ) 2 The mixture was put into a sealable stainless steel tank, protected by nitrogen, and mechanically mixed on an automatic mechanical powder mixer with a ball-to-material ratio of 80:1, a rotating speed of 60 rpm, and a mixing time of 12 hours. Then, the homogeneous mixture is transferred to a vacuum sintering furnace without being exposed to the air, and the vacuum protection is adopted, and the vacuum degree is 10 -2 -10 -6 Atm, the sintering temperature of the sample is 300°C, the holding time is 24h, and the Li-Mg-N-H hydrogen storage material is prepared by sintering. The mixing and sintering preparation conditions of the samples are also listed in Table 1. Infrared spectroscopy tests were carried out on the sintered samples, figure 2 shown as LiNH 2 -Mg 3 N 2 -Mg(NH 2 ) 2 Infrared spectra of Li-Mg-N-H samples prepared as raw materials. It can be seen from...

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Abstract

The invention discloses a method for preparing Li-Mg-N-H hydrogen storage material. The mixture of the nitride or amino-compound of Li and Mg, the nitride or amino-compound of Mg is loaded in a stainless steel tank and evenly blended by a mechanical mixing or mechanical ball milling way; the evenly blended mixture is loaded in a sintering furnace, the sintering furnace is vacuumized or charged with inert gases and is heated to the temperature range from 250 to 350 DEG C for heat preservation and then the Li-Mg-N-H hydrogen storage material is obtained; the Li-Mg-N-H hydrogen storage material is loaded into a ball milling tank and undergoes ball milling process on a ball mill, and the grain diameter of the sample powder processed with ball milling is smaller than 100nm. The preparation method has simple operation, easy control and low cost. The Li-Mg-N-H prepared and processed by the invention has high hydrogen storage capacity, low working temperature and high speed of hydrogen absorbing and discharging and good reversibility, thus being the hydrogen storage material with excellent performance and being suitable for the storage and transportation of hydrogen.

Description

technical field [0001] The invention relates to a hydrogen storage material, in particular to a preparation method of a novel Li-Mg-N-H hydrogen storage material. Background technique [0002] Hydrogen is known as a green energy carrier in the 21st century due to its abundant resources, high combustion efficiency, and no pollution. The use of hydrogen storage materials to store and transport hydrogen is safe, efficient, and low in cost, so it has attracted much attention. Practical hydrogen storage materials must meet the requirements of high hydrogen storage density, fast hydrogen absorption and desorption, moderate working temperature, and high safety. For the on-board hydrogen source system for fuel cells, the International Energy Association (IEA) puts forward the goal of hydrogen storage materials that the mass hydrogen storage density is greater than 5%, and the volume hydrogen storage density is greater than 50kg H 2 / m 3 , the dehydrogenation temperature is lower ...

Claims

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Application Information

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IPC IPC(8): C01B6/24C01B3/02
Inventor 潘洪革刘永锋钟凯高明霞
Owner ZHEJIANG UNIV
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