Method for preparing air electrode

An air electrode and electrospinning technology, which is applied to battery electrodes, circuits, electrical components, etc., can solve the problems of diffusion and transfer of unfavorable reaction products, increase the electrochemical polarization of air batteries, and hinder the diffusion of oxygen in catalysts, etc., to achieve The effect of slowing down the polarization phenomenon, reducing concentration polarization, good hydrophobicity and air permeability

Inactive Publication Date: 2019-03-01
蔚蓝(广东)新能源科技有限公司
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Problems solved by technology

[0003] At present, there are many polarization phenomena in air electrodes. The catalyst and oxygen cannot form a good three-phase reaction interface in the cathode catalyst structure, which is not conducive to the diffusion and transfer of reaction products, resulting in the deposition of reaction products and hindering the diffusion of oxygen in the catalyst. At the same time, due to the poor conductivity of the reaction product, the electrochemical polarization of the air battery is increased, and the high charging voltage will decompose the organic electrolyte in the battery system and cause the air battery to fail to work normally.

Method used

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preparation example Construction

[0029] The invention provides a method for preparing an air electrode, comprising:

[0030] (1) A first diffusion layer and a second diffusion layer are formed on both sides of the current collector. Wherein, the first diffusion layer and the second diffusion layer are prepared by mixing activated carbon and polytetrafluoroethylene, which are permeated on both sides of the current collector. The current collector can be made of conductive materials with a honeycomb structure such as copper mesh and nickel mesh.

[0031] (2) The catalyst and the polymer solution are formulated into a spinning solution. Among them, the catalyst is selected from one or more of carbon-supported platinum, carbon-supported silver and carbon-supported manganese dioxide, and the polymer solution is selected from PVA or PVP, with a medium viscosity, a content of 10%, and an average molecular weight of 110,000 to 130,000 polymer, and the mass ratio of the catalyst to the polymer solution is 1:1-10.

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Embodiment 1

[0037] See figure 1 , the activated carbon and polytetrafluoroethylene are mixed and arranged, and permeated on both sides of the current collector 3 to form the first diffusion layer 2 and the second diffusion layer 4 . Weigh 5g of carbon-supported manganese dioxide and 50g of PVA solution, mix and magnetically stir for 4 hours to obtain the required spinning solution. Aspirate the spinning solution into a 5 mL glass syringe equipped with a 9# stainless steel needle and fix it on the syringe pump. The spray needle is connected to the positive pole of the high voltage power supply, and the collector is connected to the negative pole of the power supply. The flow rate of the spinning solution is controlled by a syringe pump, and the flow rate is 0.5 mL / h. When droplets appear at the needle, turn on the high-voltage power supply, set the injection voltage to 15kV, set the distance between the injection needle and the first diffusion layer 4 to 15cm, adjust the drum speed to 12...

Embodiment 8

[0039] In Example 8, except that the data shown in Table 1 are different from Example 1, the injection voltage is set to 5kV, the distance between the spray needle and the first diffusion layer is 10cm, the rotating speed of the drum is adjusted to 80rpm, and the spinning time is 20min.

[0040] See figure 2 , in Comparative Example 1, a diffusion layer 2' is provided on one side of the current collector 3', and the catalyst carbon-supported platinum is mixed with the polymer solution at a mass ratio of 1:5 to prepare a spinning solution, which is then sprayed on the diffusion layer. Catalytic layer 1' is formed on layer 2', the injection voltage is set to 15kV, the distance between the spray needle and the first diffusion layer is 15cm, the rotating speed of the drum is adjusted to 120rpm, the spinning time is 40min, and the waterproof and breathable membrane is 4' placed on the side of the current collector 3', and rolled to obtain an air electrode 100'.

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Abstract

The invention provides a method for preparing an air electrode. The method comprises the steps: (1) forming a first diffusion layer and a second diffusion layer at the two sides of a current collector; (2) preparing a spinning solution from a catalyst and a macromolecular solution; (3) spraying the spinning solution to the first diffusion layer, so as to obtain a catalyzing layer; (4) placing a waterproof air-permeable film on the second diffusion layer, and carrying out rolling, thereby obtaining the air electrode. According to the method for preparing the air electrode, provided by the invention, the prepared air electrode is high in electric conductivity, good in air permeability and high in catalysis performance, so that a phenomenon of polarization of air batteries can be decelerated,and electrochemical properties of the batteries are improved.

Description

technical field [0001] The invention belongs to the technical field of air batteries, and in particular relates to a preparation method of an air electrode. Background technique [0002] The air electrode is a gas diffusion electrode, one side of which is in contact with the electrolyte and the other side is in contact with oxygen in the air, forming a three-phase stable state on the surface of the catalyst. During the discharge process of the battery, the air electrode is used as the cathode, oxygen diffuses along the electrode surface into the interior of the electrode, and a reduction reaction occurs under the action of the catalyst. The performance of the air electrode is not only related to the catalyst, but also related to the structure of the air electrode. The air electrode is required to have high porosity, uniform pore distribution, good air permeability, and good anti-permeation ability. [0003] At present, there are many polarization phenomena in air electrodes...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/88
CPCH01M4/88H01M4/8867Y02E60/50
Inventor 夏德兴李宁呼继梅
Owner 蔚蓝(广东)新能源科技有限公司
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