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Air electrode of zinc-air battery

An air electrode, zinc-air battery technology, applied in battery electrodes, electrical components, circuits, etc., can solve the problems of low current density, low production cost, and high price, achieve simple operation, reduce electrode production cost, and prevent agglomeration. Effect

Inactive Publication Date: 2012-01-18
SHANGHAI YAOYU INDAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide an air electrode for zinc-air batteries in order to overcome the defects of existing noble metal catalysts and zinc-air battery air electrodes using manganese dioxide as the main catalyst, such as low current density, high price, and low production cost. Electrode, the catalyst used in the air electrode is simple to prepare, the price is low, and the current density of the air electrode is improved by using the catalyst

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0019] Treat 5 g of activated carbon with dilute nitric acid with a volume concentration of 10%, filter, wash with distilled water for several times, dry at 90°C, grind, pass through a mesh (400 mesh sieve) to prepare the treated activated carbon, and cool to below 5°C; TiCl at ℃~5℃ 4 Slowly inject the solution into the treated activated carbon, and keep stirring until no white acid mist escapes, the hydrolysis is completed, the reaction product is calcined at 400°C, cooled to room temperature, and ground to obtain the TiO 2 / AC Catalyst. Among them, TiCl 4 For analytical purity, the dosages are 6ml, 10ml, 14ml, 18ml, and 22ml respectively. Through conversion, the corresponding mass ranges are 10.36g, 17.26g, 24.16g, 31.07g, and 37.97g.

[0020] Take 20% by weight of the above five catalysts, 47% of carbon materials (activated carbon and acetylene black, the preferred weight ratio is 6:1), 10% of polyethylene glycol, 8% of absolute ethanol and 15% of The polytetrafluoroethy...

Embodiment 2

[0022] Treat 5g of activated carbon with dilute nitric acid with a volume concentration of 10%, filter, wash with distilled water several times, dry at 90°C, grind, and pass through a mesh (400 mesh sieve) to prepare the treated activated carbon, cool to below 5°C; pipette 0 18ml of TiCl at ℃~5℃ 4 The analytically pure solution was slowly poured into the treated activated carbon, and kept stirring until no white acid mist escaped, and the hydrolysis was completed. , Calcined at 500°C, 600°C, 700°C, 800°C, 900°C, cooled to room temperature and ground to obtain TiO 2 / AC catalyst samples. The XRD analysis of the sample was carried out on the D / MAX-3B rotating target X-ray powder diffractometer, and the XRD patterns at different calcination temperatures are as follows figure 2 As shown, it can be seen from the figure that: TiO below 400°C 2 The crystal growth is not perfect, and the perfect anatase type with structural activity cannot be formed; it shows the highest catalytic...

Embodiment 3

[0024] Treat 5g of activated carbon with dilute nitric acid with a volume concentration of 10%, filter, wash with distilled water several times, dry at 90°C, grind, and pass through a mesh (400 mesh sieve) to prepare the treated activated carbon, cool to below 5°C; pipette 0 18ml of TiCl at ℃~5℃ 4 Slowly pour the analytically pure solution into the treated activated carbon, and keep stirring until no white acid mist escapes, and the hydrolysis is completed. The reaction product is calcined at 400°C, cooled to room temperature, and ground to obtain the TiO 2 / AC Catalyst.

[0025] Take 5% by weight of the above catalyst, 75% of carbon material (activated carbon and acetylene black with a weight ratio of 6:1), 10% of absolute ethanol and 10% of polytetrafluoroethylene mixed and rolled to form a catalytic layer ; Take 35% carbon material by weight (activated carbon and acetylene black with a weight ratio of 6:1), 5% polyethylene glycol, 5% absolute ethanol and 55% polytetrafluor...

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Abstract

The invention relates to an air electrode of a zinc-air battery; the air electrode is molded by compression of a catalysis layer, a diffusion layer and a current collector; a catalyst in the catalysis layer is a TiO2 / AC catalyst. The TiO2 / AC catalyst is prepared by the following method: processing active carbon by dilute nitric acid with a volume concentration of 10%, filtering, washing with distilled water for several times, drying, grinding, sieving, performing a hydrolysis reaction with a titanium tetrachloride solution with a mass ratio of 2-7.6 times of the active carbon at 0 DEG C-5 DEG C, calcining the reaction product at 400 DEG C-800 DEG C, cooling to room temperature, and grinding. Compared with the prior art, the catalyst used by the air electrode of the invention has a simple preparation method, and low price; and with the catalyst, the current density of the air electrode is well increased.

Description

technical field [0001] The invention relates to a zinc-air battery, in particular to an air electrode of the zinc-air battery. Background technique [0002] Zinc-air batteries use metal zinc as the negative electrode active material, and oxygen in the air as the positive electrode active material. The two active materials are catalyzed by the catalytic layer of the air electrode at the interface between the air electrode and the electrolyte to undergo an electrochemical reaction to generate electricity. Zinc-air batteries have the advantages of high specific energy, low cost, and stable discharge performance, and have huge market prospects. However, zinc-air batteries have low discharge current density, which is not suitable for high current density discharge, which limits their wide application. The method of increasing the total air diffusion area of ​​the air electrode can increase the discharge current to a certain extent, but at the same time it will aggravate the probl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/86H01M4/90
CPCY02E60/50
Inventor 不公告发明人
Owner SHANGHAI YAOYU INDAL
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