Metal-air battery air electrode and preparation method thereof

A metal-air battery and air electrode technology, which is applied to battery electrodes, fuel cell half-cells, primary battery half-cells, circuits, etc., can solve the problems that the porous structure is difficult to control, difficult to obtain, and not clear enough. Achieve the effect of excellent adsorption, stable structure, and prevent excessive heating rate

Active Publication Date: 2020-05-19
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Metal-air battery air electrode and preparation method thereof

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preparation example Construction

[0044] The 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 were prepared into a mixed solution, stirred evenly, and then allowed to stand for adsorption, then centrifuged, washed, and dried; followed by high-temperature carbonization treatment in an inert gas atmosphere, and after carbonization, acid treatment was performed to remove 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 raising the temperature to 70-90°C and keeping it for 18-30h, then raising the temperature to 130-180°C and keeping it for 5-10h, and finally raising the temperature to 700°C ~1000℃ for 5~10h.

[0048] Preferably, in step S1, the high-temperature carbonization treatment i...

Embodiment 1

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

[0074] (1) Synthesis of MIL-53(Al) (Levashill framework material whose metal nodes are 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 dissolve completely; then the mixed solution was transferred to a polytetrafluoroethylene reactor, put into an oven, and heated to 393K for constant temperature reaction Cool to room temperature after 72 hours; centrifuge to collect the white solid obtained by the reaction, wash with DMF several times, and finally put it into a 413K oven to dry to obtain MIL-53(Al) powder.

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

[0077] Mix 500mg of activated MIL-53(Al) powder, 20ml of sugar alcohol (FA), 5ml of NH 4 OH and 5g of urea were configured into a mixed solution, kept in a stirring state for 12 hours, then stood overnight, and collected solid p...

Embodiment 2

[0085] The preparation method of a kind of metal-air battery air electrode that embodiment 2 provides is compared with embodiment 1, and difference is that step (1) is the synthesis of ZIF-8 (metal node is the zeolite imidazolate framework material of Zn), details as follows:

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

[0087] Other steps are basically the same as those in Embodiment 1, and will not be repeated here.

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

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Abstract

The invention provides a metal-air battery air electrode and a preparation method thereof. The method comprises the steps: mixing a metal organic framework material with nitrogen source micromolecules, so that the nitrogen source micromolecules are adsorbed in the metal organic framework; then, carrying out high-temperature carbonization treatment in a nitrogen atmosphere; finally, carrying out acid treatment to remove metal particles to obtain a nitrogen-doped porous carbon material; and preparing the porous carbon material into slurry, and coating the surface of a conductive substrate with the slurry to obtain the air electrode of the metal-air battery. The nitrogen-doped porous carbon prepared by the method has high specific surface area, high nitrogen content and excellent oxygen reduction catalytic activity, the PVDF binder is added into the prepared slurry to ensure the connection between the catalyst and the substrate, and the erosion of electrolyte to the catalyst is resisted through the PTFE film, so that the stability of the electrode is maintained. 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 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] Air battery is a kind of chemical battery, which uses oxygen in the air as an oxidant to undergo a chemical reaction 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 and realizes 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 achieve 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 most important factors affecting the performance of the air battery. [0003] For example, the working principle of a lithium-air battery is: met...

Claims

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Application Information

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