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Lithium metaborate hydrogen storage composite material adulterated with lithium hydride and preparation method thereof

A technology of composite materials and lithium metaborate, which is applied in the field of hydrogen storage composite materials and its preparation, can solve the problems of slow hydrogen discharge rate and high hydrogen discharge temperature, and achieve the effects of fast hydrogen discharge rate, low hydrogen discharge temperature and low cost

Active Publication Date: 2015-09-16
YANSHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Although the composite material prepared above has improved the hydrogen desorption performance of LiH, it still has the disadvantages of high dehydrogenation temperature and slow dehydrogenation rate.

Method used

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  • Lithium metaborate hydrogen storage composite material adulterated with lithium hydride and preparation method thereof
  • Lithium metaborate hydrogen storage composite material adulterated with lithium hydride and preparation method thereof
  • Lithium metaborate hydrogen storage composite material adulterated with lithium hydride and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Under the protection of argon atmosphere, LiH and LiBO 2 Place it in the ball mill tank of a high-energy ball mill at a molar ratio of 1:1 for ball milling, the ball-to-material ratio is 40:1, the ball material is stainless steel, the rotating speed is 500r / min, the ball milling time is 1h, and the ball milling method is positive / Reverse intermittent ball milling, every 15 minutes of ball milling, and 15 minutes of intermittent ball milling. After the ball milling is completed, it is naturally cooled to room temperature, and then compressed into tablets and packaged in an argon atmosphere.

[0020] Take a small amount of compressed samples and put them into the sample tube for temperature programmed desorption (TPD) test. The heating conditions are as follows: the heating rate is 5°C / min, the temperature rise range is from room temperature to 600°C, and the holding temperature is 600°C. Such as figure 1 As shown, it can be seen that the doped LiBO 2 The hydrogen rele...

Embodiment 2

[0022] Under the protection of argon atmosphere, LiH and LiBO 2 Place it in the ball mill tank of a high-energy ball mill at a molar ratio of 1:1 for ball milling, the ball-to-material ratio is 10:1, the ball material is stainless steel, the speed is 200r / min, the ball milling time is 5h, and the ball milling method is positive / Reverse intermittent ball milling, every 15 minutes of ball milling, and 15 minutes of intermittent ball milling. After the ball milling is completed, it is naturally cooled to room temperature, and then compressed into tablets and packaged in an argon atmosphere.

[0023] Take a small amount of compressed sample and put it into the sample tube for hydrogen desorption kinetics test. A hydrogen pressure of 3.0 MPa was given when the temperature was raised to prevent the sample from releasing hydrogen before 450°C. Such as figure 2 As shown, it can be seen that the doped LiBO at 450 °C 2 The hydrogen desorption rate of the composite material is very ...

Embodiment 3

[0025] Under the protection of argon atmosphere, LiH and LiBO 2 Place it in the ball mill tank of a high-energy ball mill at a molar ratio of 2:1 for ball milling, the ball-to-material ratio is 30:1, the ball material is stainless steel, the speed is 300r / min, the ball milling time is 5h, and the ball milling method is positive / Reverse intermittent ball milling, every 15 minutes of ball milling, and 15 minutes of intermittent ball milling. After the ball milling is completed, it is naturally cooled to room temperature, and then compressed into tablets and packaged in an argon atmosphere.

[0026] Take a small amount of compressed sample and put it into the sample tube for hydrogen desorption kinetics test. When the temperature is raised, a hydrogen pressure of 3.0 MPa is given to suppress the hydrogen release of the sample before 500°C. From the results of hydrogen desorption, at 500°C, the hydrogen desorption rate of the hydrogen storage material is equivalent to that of Ex...

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Abstract

A lithium metaborate hydrogen storage composite material adulterated with lithium hydride consists of LiBO2 and LiH, the molar ratio of the abovementioned two ingredients is LiBO2:LiH=0.5-2:1. The preparation method of the lithium metaborate hydrogen storage composite material adulterated with the lithium hydride mainly comprises the steps of under the protection of argon, mixing the LiH and the LiBO2 uniformly according to the abovementioned molar ratio, then putting the mixture in a ball-milling pot so as to carry out ball-milling treatment, the ball-milling time being 1-5 hours, the ball-to-powder weight ratio is 10-40:1, the revolving speed being 200-500r / min, the ball-milling mode being positive / reverse intermittent ball-milling, pausing for 15min when carrying out ball-milling for 15min each time, cooling down to the indoor temperature naturally after the ball-milling is finished, taking out the composite material prepared under the protection of the argon and carrying out sealed package, and obtaining the lithium metaborate hydrogen storage composite material adulterated with the lithium hydride. According to the lithium metaborate hydrogen storage composite material adulterated with the lithium hydride, the preparation method is simple, the raw material is easy to obtain, the cost is cheap, the hydrogen desorption temperature is low, the hydrogen desorption rate is fast, and the lithium metaborate hydrogen storage composite material adulterated with the lithium hydride is conducive to industrialized volume production.

Description

technical field [0001] The invention belongs to the technical field of new materials, in particular to a hydrogen storage composite material and a preparation method thereof. Background technique [0002] The hydrogen storage density per unit volume of metal hydride hydrogen storage materials is about 1000 times that of gaseous hydrogen under the same temperature and pressure conditions, and hydrogen is stored in the material in the form of atoms. The hydrogen absorption / desorption process is limited by thermal effects and speed. With a high degree of safety, it is considered to be the most practical way to store hydrogen. [0003] Solid-state LiH is the ionic crystal with the simplest electronic structure, and its unit cell contains only four electrons. It has been regarded as an ideal system for testing various calculation methods in solid-state quantum theory. In addition, lithium hydride has a high melting point (688°C), low density (0.774g / cm 3 ), high hydrogen conten...

Claims

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Application Information

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IPC IPC(8): C01B3/00
CPCY02E60/32
Inventor 韩树民马雨飞刘婷刘洋郭亮亮
Owner YANSHAN UNIV
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