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Nitrogen-doped porous carbon-coated hydrogen storage alloy powder and preparation method thereof

A nitrogen-doped porous carbon and hydrogen storage alloy technology, which is applied in the field of hydrogen storage alloys, can solve the problem that dynamic performance and cycle stability cannot be optimized at the same time, and achieve good kinetic performance and good cycle performance.

Active Publication Date: 2020-02-28
SICHUAN UNIV
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Problems solved by technology

[0005] The invention provides a nitrogen-doped porous carbon-coated hydrogen storage alloy powder and a preparation method thereof to solve the problem that the dynamic performance and cycle stability of the existing hydrogen storage alloy electrodes cannot be optimized simultaneously

Method used

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  • Nitrogen-doped porous carbon-coated hydrogen storage alloy powder and preparation method thereof
  • Nitrogen-doped porous carbon-coated hydrogen storage alloy powder and preparation method thereof
  • Nitrogen-doped porous carbon-coated hydrogen storage alloy powder and preparation method thereof

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Effect test

Embodiment 1～16 and comparative example 1～9

[0062] Carry out experimental detection to embodiment 1~16 and comparative example 1~9:

[0063] 1. SEM and XRD detection:

[0064] Adopt scanning electron microscope and X-ray diffractometer to detect embodiment 1~16 and comparative example 1~9, take embodiment 1 and comparative example 1 as example, detection result is as follows Figure 1~4 shown.

[0065] in figure 1 The X-ray diffraction patterns of the second powder (M@NC-900) obtained in Example 1 and Comparative Example 1 (M); from the XRD analysis results, it can be seen that the crystal structure of the hydrogen storage alloy has not changed, and the CaCu 5 crystal structure, and the strongest peak of the hydrogen storage alloy becomes sharper, indicating that the crystallinity becomes better.

[0066] figure 2 It is the SEM topography figure of comparative example 1 (M), and the magnification is 10000 times, image 3 It is the SEM topography figure of the first powder (M@Zif-8) in Example 1, the magnification ...

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Abstract

The invention relates to the technical field of hydrogen storage alloys, in particular to nitrogen-doped porous carbon-coated hydrogen storage alloy powder. The nitrogen-doped porous carbon-coated hydrogen storage alloy power comprises hydrogen storage alloy powder, wherein a nitrogen-doped porous carbon layer is coated outside the hydrogen storage alloy powder, the mass fraction of the carbon content in the nitrogen-doped porous carbon layer is 5%-10%, and the mass fraction of the nitrogen content is 1%-3%. The preparation method of the nitrogen-doped porous carbon-coated hydrogen storage alloy powder comprises the following steps of pouring the hydrogen storage alloy powder into an alcohol solution containing transition metal salts; then adding the mixed solution into an alcohol solutioncontaining imidazole ligand, and performing standing to obtain a precursor; and finally carrying out high-temperature heat treatment on the precursor at 700-1000 DEG C for 1-3 hours after drying theprecursor so as to obtain the nitrogen-doped porous carbon-coated hydrogen storage alloy powder. The nitrogen-doped porous carbon-coated hydrogen storage alloy powder obtained through the preparationmethod is good in rate performance, high in power performance, excellent in low-temperature performance and good in cycle performance.

Description

technical field [0001] The invention relates to the technical field of hydrogen storage alloys, in particular to a nitrogen-doped porous carbon-coated hydrogen storage alloy powder and a preparation method thereof. Background technique [0002] Some metals have a strong ability to capture hydrogen. Under certain temperature and pressure conditions, these metals can "absorb" a large amount of hydrogen, react to form metal hydrides, and release heat at the same time. Afterwards, these metal hydrides are heated. They decompose again, releasing the hydrogen stored in them. These metals that "absorb" hydrogen gas are called hydrogen storage alloys. [0003] The electrochemical performance of nickel-metal hydride batteries is mainly determined by the negative electrode (hydrogen storage alloy), which currently affects AB 5 There are two main reasons for the kinetic performance of hydrogen storage alloys: 1. The huge charge transfer resistance on the electrode surface; 2. The slow...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/02H01M4/38H01M4/62H01M10/30
CPCH01M4/383H01M4/625H01M10/30B22F1/142B22F1/16Y02E60/10
Inventor 王尧李金池陈云贵吴朝玲严义刚廖逸飞何剑
Owner SICHUAN UNIV
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