A kind of electrode film and preparation method thereof

An electrode film and chemical method technology, applied in the field of electrode film and its preparation, can solve the problems of limiting the high current discharge performance of aluminum-air batteries, slow catalytic oxygen reduction reaction rate, poor battery high current discharge effect, etc., and achieve light weight. , low cost, stable discharge effect

Active Publication Date: 2020-11-03
中科(广州)能源科技开发有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 1) The catalytic activity of the catalyst in the electrode is low, resulting in a slow catalytic oxygen reduction reaction rate during high current discharge
The air electrode uses noble metals such as platinum, silver, and rhodium with better catalytic effects as catalysts, which will increase the cost of the battery and increase the cost of commercialization. Using low-cost catalysts, such as some metal oxides, will result in poor high-current discharge of the battery;
[0005] 2) The battery generates heat when it works with high current: when the battery is discharged with a large current, due to the certain resistance of the battery, especially when the resistance of the battery is large, the battery will generate heat, and the melting point of aluminum is low, so there is a possibility that the tabs will be fused. This limits the high-current discharge performance of Al-air batteries

Method used

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  • A kind of electrode film and preparation method thereof
  • A kind of electrode film and preparation method thereof
  • A kind of electrode film and preparation method thereof

Examples

Experimental program
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Effect test

preparation example Construction

[0063] A method for preparing an electrode film, comprising:

[0064] Catalyst layer preparation steps: in Na 2 SO 4 Add anhydrous ethanol, carbon carrier and catalyst to the solution in turn, mix evenly and add PTFE dropwise, after the dropwise addition, ultrasonically disperse, continue stirring to obtain the catalytic layer solution; the molar concentration of the catalyst in the catalytic layer solution is 0.001-0.02mol / L: heating the catalytic layer solution in a water bath for demulsification, and suction filtration to obtain a catalytic layer paste; rolling the catalytic layer paste to obtain a catalytic layer;

[0065] With Ag + concentration increases, the Ag + When it is reduced, the concentration of silver generated is large, and it is easy to agglomerate. After agglomeration, the uniform dispersion of the generated silver on the carbon carrier is reduced, its specific surface area is reduced, the formation of effective three-phase reaction interface is also red...

Embodiment 1-3

[0072] The electrode film of embodiment 1-3 is prepared by the following method:

[0073] 1. Preparation of catalyst:

[0074] MnO 2 The preparation method of -Ag / C is: prepare the raw material according to the number of moles in Table 1, and then weigh the AgNO 3 and AgNO 3 2 times the weight of polyvinylpyrrolidone (PVP), mixed and dissolved in deionized water to prepare AgNO 3 A solution with a concentration of 0.01mol / L; then add activated carbon and stir well, add 0.1mol / L NaBH 4 solution, to NaBH 4 in solution with AgNO 3 Equal molar numbers, keep stirring and fully react, filter, wash, take the solid and place it in a vacuum at 40°C to dry to obtain a 40%wt Ag / C solution;

[0075] MnO 2 Co-grinding with Ag / C solution for 1h, ultrasonic oscillation for 10min, to obtain MnO 2 -Ag / C.

[0076] The composition mole number (mol) of catalyst among the table 1 embodiment 1-3

[0077] Element Example 1 Example 2 Example 3 MnO 2

0.012 0.013 ...

Embodiment 1-3

[0099] Embodiment 1-3 is detected:

[0100] Electrode film detection methods mainly include:

[0101] 1) XRD physical characterization:

[0102] X-ray diffraction test (XRD) is X-ray diffraction of materials, which will produce a discontinuous scattering image. A series of diffraction peaks of different intensities appear at different diffraction angles. The position, intensity and shape of the peaks can be analyzed. Parameters such as material phase composition, lattice constant, crystallinity and grain size were obtained.

[0103] After the sample is carefully ground, the tablet is tested in an X-ray diffractometer; CuKα target, graphite monochromator, scanning speed: 9° / min, scanning angle range: 10°-80°, sampling interval: 0.03°.

[0104] 2) Potentiodynamic polarization curve test:

[0105] Determining the relationship curve between electrode potential and current density is the basic method to study electrochemical kinetics, and these curves are called polarization cur...

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Abstract

The invention discloses an electrode film and a preparation method thereof. The electrode film comprises a catalytic layer, a current collecting layer and a waterproof gas permeable layer, wherein thecatalytic layer, the current collecting layer and the waterproof gas permeable layer are superposed. The catalytic layer comprises a carbon carrier and a catalyst. The carbon carrier comprises an alkali-washed chemically active carbon and Vulcan XC72R carbon black. The mass ratio of chemically active carbon to Vulcan XC72R carbon black is (3 to 10):1. The catalyst is MnO2-Ag / C. The preparation method of the electrode film comprises the steps that catalytic layer preparation: the carbon carrier, a pore forming agent, the catalyst and a binder are added in a solvent, and a catalytic layer solution is acquired after ultrasonic dispersion; the catalyst layer solution is heated in a water bath to break the emulsion, and suction filtration is performed to acquire catalytic layer paste; the catalytic layer paste is rolled to acquire the catalytic layer; pressing: the acquired catalytic layer, the waterproof gas permeable layer and the current collecting layer are laminated to acquire an electrode film; and the electrode film is used in an aluminum-air battery to improve the rate of catalytic oxygen reduction reaction, so that the aluminum-air battery provides steady power.

Description

technical field [0001] The invention relates to an electrode film and a preparation method thereof, belonging to the technical field of energy materials. Background technique [0002] An air battery is a type of chemical battery. The construction principle is similar to that of a dry battery, except that its oxidant is taken from the oxygen in the air. Lithium, magnesium, nickel, and aluminum can all be used as the negative electrode of the air battery, but there are large differences in the negative electrode metal materials used, the prepared positive electrode materials, and the electrolyte. Among them, aluminum is the preferred negative electrode material because it is easy to obtain, large in quantity, can be recycled through electrolysis, has low cost, good ductility, and is easy to shape into various shapes. In addition, aluminum-air batteries have large capacity, stable discharge voltage, good safety, fast charging, environmental friendliness, small internal resist...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M12/06H01M4/86H01M4/88H01M4/92
CPCH01M4/8657H01M4/8673H01M4/8882H01M4/8896H01M4/921H01M4/923H01M4/926H01M12/06
Inventor 彭永新徐慧勇翁永富余继敏彭李少荣
Owner 中科(广州)能源科技开发有限公司
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