Air electrode for metal-air battery and preparation method thereof

A metal-air battery and air electrode technology, applied in battery electrodes, fuel cell half-cells, primary battery-type half-cells, circuits, etc., can solve the problem that the catalytic performance cannot be surpassed by precious metal catalysts, it is difficult to obtain, and there is a porous structure Difficult to control and other problems, to achieve the effect of contributing to catalytic activity and stability, preventing excessive heating rate, and excellent adsorption

Active Publication Date: 2021-08-17
HUAZHONG UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

However, it is still impossible to surpass the noble metal catalysts in terms of catalytic performance.
The reason is that due to the limitations of the carbon material preparation process, it is difficult to obtain catalysts with high specific surface area, high heteroatom doping amount and well-developed pores.
Not only that, but in the synthesis of electrochemical catalysts, there are still some problems that need to be solved, such as difficult to control the porous structure, insufficient exposure of active sites, and unclear catalytic mechanism.
[0006] Therefore, designing and preparing an air electrode catalyst with a reasonable structure and composition, so as to solve the problems of insufficient capacity and poor reversibility of metal-air batteries in the air, has become an urgent problem to be solved.

Method used

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  • Air electrode for metal-air battery and preparation method thereof
  • Air electrode for metal-air battery and preparation method thereof
  • Air electrode for metal-air battery and preparation method thereof

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preparation example Construction

[0044] The present invention provides a method for preparing an air electrode of a metal-air battery, comprising the following steps:

[0045] S1. Preparation of nitrogen-doped porous carbon:

[0046] The metal organic framework material and the nitrogen source are prepared into a mixed solution, stirred evenly, and then left to stand for adsorption, then centrifuged, washed, and dried; then high-temperature carbonization treatment is performed in an inert gas atmosphere, and after the carbonization is completed, acid treatment is performed to remove the metal particles to obtain Nitrogen-doped porous carbon;

[0047] The high-temperature carbonization treatment includes the following steps: heating at a heating rate of 3-8 °C / min, first heating to 70-90 °C for 18-30 h, then heating to 130-180 °C for 5-10 h, and finally heating to 700 °C ~1000℃ for 5~10h.

[0048] Preferably, in step S1, the high temperature carbonization treatment includes the following steps: heating at a ...

Embodiment 1

[0073] A preparation method of an air electrode for a metal-air battery, comprising the following steps:

[0074] (1) Synthesis of MIL-53(Al) (Levassil framework material whose metal node is Al)

[0075] Al(NO 3 ) 3 ·9H 2 O and terephthalic acid were prepared according to the molar ratio of 1:2.25, added to 30ml of DMF to make it completely dissolved; then the mixed solution was transferred to a polytetrafluoroethylene reactor, placed in an oven, heated to 393K for constant temperature reaction After 72 hours, it was cooled to room temperature; the white solid obtained by the reaction was collected by centrifugation, washed with DMF for several times, and finally dried in a 413K oven to obtain MIL-53(Al) powder.

[0076] (2) Preparation of NPC (nitrogen-doped porous carbon)

[0077] 500mg activated MIL-53 (Al) powder, 20ml sugar alcohol (FA), 5ml NH 4 OH and 5 g of urea were prepared into a mixed solution, kept under stirring for 12 hours, and then allowed to stand overni...

Embodiment 2

[0085] Compared with Example 1, the preparation method of a metal-air battery air electrode provided in Example 2 is different in that step (1) is the synthesis of ZIF-8 (the zeolite imidazolate framework material whose metal node is Zn), details as follows:

[0086] Zn(NO 3 ) 2 ·6H 2 O (2.933g, 9.87mmol) was added to 200ml of methanol and stirred to dissolve to form solution (I), and Hmim (2-methylimidazole) (6.489g, 79.04mmol) was added to 200ml of methanol to dissolve to form solution (II), and then the solution was dissolved (I) Quickly poured into solution (II) and stirred at room temperature for 1 h to form white crystals. The obtained product was collected by centrifugation, washed several times with methanol, and dried in a 413K oven.

[0087] The other steps are basically the same as those in Embodiment 1, and are not repeated here.

[0088] from Figure 1 to Figure 3 It can be seen that ZIF-8 was successfully prepared in this example, and the particle distribut...

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Abstract

The invention provides an air electrode of a metal-air battery and a preparation method thereof. Mix the metal-organic framework material with the nitrogen source small molecules, so that the nitrogen source small molecules are adsorbed in the metal-organic framework; then carry out high-temperature carbonization treatment in a nitrogen atmosphere, and finally carry out acid treatment to remove metal particles, and obtain nitrogen-doped porous carbon materials; The porous carbon material is made into slurry and coated on the surface of the conductive substrate to obtain the air electrode of the metal-air battery. The nitrogen-doped porous carbon prepared by the present invention has a high specific surface area, high nitrogen content and excellent oxygen reduction catalytic activity. A PVDF binder is added to the prepared slurry to ensure the connection between the catalyst and the substrate. Through the PTFE film, Resists the erosion of the catalyst by the electrolyte, thereby maintaining the stability of the electrode. The preparation method provided by the invention is simple and feasible, has good repeatability, is convenient for large-scale production, and can be used in the field of air batteries, especially the air electrodes of lithium-air batteries.

Description

technical field [0001] The invention belongs to the technical field of batteries, and in particular relates to an air electrode of a metal-air battery and a preparation method thereof. Background technique [0002] The air battery is a kind of chemical battery, which uses the oxygen in the air as the oxidant to chemically react to form one pole of the battery, and the metal electrode is the other pole of the battery, which converts chemical energy into electrical energy to achieve energy supply. The current air batteries mainly include lithium-air batteries, zinc-air batteries and aluminum-air batteries. An important step for the air battery to realize its energy conversion is to use the air electrode to reduce the oxygen in the air. Therefore, the electrochemical performance and stability of the air electrode have become the stress factors affecting the performance of the air battery. [0003] For example, the working principle of a lithium-air battery is: metal lithium i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/90H01M4/88H01M4/96H01M12/06
CPCH01M4/8825H01M4/9075H01M4/96H01M12/06
Inventor 曹元成张炜鑫吴林
Owner HUAZHONG UNIV OF SCI & TECH
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