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NiF2-dopped LiBH4-LiNH2-CaH2 composite hydrogen storage material and preparation method thereof

A hydrogen storage material, awt%libh4-bwt%linh2-cwt�h2-dwt%nif2 technology, applied in the production of hydrogen and other directions, can solve the problem of high hydrogen desorption temperature, and achieve the effect of accelerating the performance of hydrogen absorption and desorption

Inactive Publication Date: 2014-01-29
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the patent of this invention is to solve the problem of LiBH 4 -LiNH 2 The above-mentioned dehydrogenation temperature of the system is too high and the problems associated with the generation of impurity gases during the dehydrogenation process, improve the LiBH 4 -LiNH 2 The hydrogen storage and discharge performance of the system, the invention provides a NiF 2 Doped LiBH 4 -LiNH 2 -CaH 2 Hydrogen storage material with improved reversible hydrogen absorption and desorption performance and preparation method thereof

Method used

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  • NiF2-dopped LiBH4-LiNH2-CaH2 composite hydrogen storage material and preparation method thereof
  • NiF2-dopped LiBH4-LiNH2-CaH2 composite hydrogen storage material and preparation method thereof
  • NiF2-dopped LiBH4-LiNH2-CaH2 composite hydrogen storage material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0025] Example 1: NiF 2 Doped LiBH 4 -LiNH 2 -CaH 2 Preparation of Composite Hydrogen Storage Materials

[0026] In the glove box under the protection of argon, take by weight 0.5g LiBH altogether by mass ratio 15wt%: 50wt%: 30wt%: 5wt% 4 、LiNH 2 , CaH 2 and NiF 2 The raw materials were poured into a 100mL ball mill jar with five 10mm stainless steel balls (17.5g), sealed and taken out from the glove box; the ball mill jar was loaded on the planetary ball mill QM-3SP2; the milling speed was set to 200r / min, the ball milling time is 15h, after the ball milling is completed, put the ball mill jar back into the glove box for sampling.

[0027] Prepare different composite hydrogen storage materials by changing the additive and the doping amount of the additive; the raw material is LiBH 4 、LiNH 2 , CaH 2 and NiF 2 ;The additive is NiF 2 .

Embodiment 2

[0028] Embodiment 2: the NiF that embodiment 1 prepares 2 Doped LiBH 4 -LiNH 2 -CaH 2 TG-MS Analysis of Composite Hydrogen Storage Materials

[0029] A 90 mg sample was weighed from the glove box for thermogravimetric-mass spectrometry (TG-MS) analysis. The test used TherMax 500 high-pressure thermobalance and GAM 200 mass spectrometer, the Ar gas flow rate was controlled at 1.7% (-145mL / min), and the system was vacuumed (5-10min) for ventilation after loading the sample. It is RT-400°C, and the heating rate is 5°C / min. The analysis results showed that the LiBH without catalyst 4 -LiNH 2 -CaH 2 The sample released hydrogen slowly before 300°C, and the weight loss only reached about 2.7wt%. Add NiF 2 The sample has completed a large amount of hydrogen desorption at about 250°C, with a total weight loss of more than 13wt%, such as figure 1 shown, indicating NiF 2 to LiBH 4 -LiNH 2 -CaH 2 The composite system has obvious catalytic effect, which can accelerate the de...

Embodiment 3

[0030] Embodiment 3: the NiF that embodiment 1 prepares 2 Doped LiBH 4 -LiNH 2 -CaH 2 DSC Analysis of Composite Hydrogen Storage Materials

[0031] The test used the Q1000DSC produced by TA Company in the United States, and the flow rate of the Ar gas carrier was controlled at 50mL / min. To avoid oxidation of the material during loading into the crucible, this operation was performed in a glove box.

[0032] Figure 3A Doped with 5wt% NiF at different heating rates 2 The DSC curve of the composite system. The results show that: when the heating rate is changed (2°C / min, 5°C / min, 10°C / min, 12°C / min), the peak temperature of the system changes regularly, that is, with the increase of the heating rate , the melting point of the system increases gradually. At the same time, for LiBH prepared by ball milling under the same conditions 4 -LiNH 2 -CaH 2 The system was compared with the doped sample, such as Figure 3B shown. The results show that: doped with 5wt% NiF 2 Th...

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Abstract

The invention relates to a preparation method of an NiF2-dopped LiBH4-LiNH2-CaH2 composite hydrogen storage material, in particular relates to a hydrogen storage material which improves the hydrogen desorption performance of an LiBH4-LiNH2-CaH2 system through doping NiF2 and a preparation method thereof, and belongs to the technical field of modification. The composite material is prepared by utilizing a mechanical milling method, when the doping amount of NiF2 is 5wt%, the system starts greatly desorbing hydrogen at 47 DEG C, the main hydrogen desorption peak temperature is 234 DEG C, and the hydrogen desorption amount reaches 3.75wt% at 175 DEG C within 5000s; the hydrogen desorption amount reaches 5.03wt% within 5h; the hydrogen desorption amount reaches 6wt% at 200 DEG C within 5000s; the hydrogen desorption amount reaches 6.55wt% at 270 DEG C within 1000s. The composite hydrogen storage material which is prepared by ball milling has good hydrogen storage and desorption performances, and the prepared NiF2-dopped LiBH4-LiNH2-CaH2 composite hydrogen storage material has good hydrogen desorption performance at low temperatures.

Description

technical field [0001] The invention relates to the technical field of modification of hydrogen storage materials, especially the use of NiF 2 Doping improves LiBH 4 -LiNH 2 -CaH 2 A hydrogen storage material with system hydrogen storage performance and a preparation method thereof. Background technique [0002] Hydrogen energy is a completely clean and resource-rich secondary energy source. The use of hydrogen energy to replace fossil fuels has become a hot spot of global concern. In order to realize the large-scale application of hydrogen energy, it is necessary to solve the three major technologies of cheap hydrogen production, safe and efficient storage and transportation, and large-scale application, and hydrogen storage technology is the main bottleneck of hydrogen energy utilization at present. Solid-state hydrogen storage is a promising high-efficiency hydrogen storage technology. In order to meet the performance requirements of hydrogen storage materials propose...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B3/02
Inventor 孙立贤刘慧徐芬曹忠司晓亮李志宝
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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