Positive electrode of zinc bromine redox flow battery and preparation thereof

A liquid flow battery and positive electrode technology, which is applied in the direction of battery electrodes, circuits, electrical components, etc., can solve the problems of poor mechanical properties of carbon felt, large differences in battery performance, and increased battery volume, and achieve excellent mechanical properties, small thickness, and high The effect of specific surface area

Active Publication Date: 2011-06-29
华秦储能技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, the positive electrodes of zinc-bromine flow batteries use carbon felts of different thicknesses. Using carbon felts as the positive electrodes of zinc-bromine batteries has the advantages of high specific surface area and high catalytic activity. However, due to the production process of carbon felts, there are differences between individuals Large differences can easily lead to differences in battery performance, and the disadvantages are especially obvious when assembling the stack
Moreover, the mechanical properties of carbon felt are poor. When assembling the battery, an additional support needs to be introduced in order to reduce the deformation of the carbon felt, which increases the volume of the battery.
Another solution is to use a carbon composite plate as the positive electrode of the battery. Although it has good mechanical properties, due to the high overpotential, the performance of the battery is quite different from that of carbon felt.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] 1) Catalyst layer slurry configuration: by weight parts, weigh 1g of chlorinated polypropylene or chlorinated polyethylene, 1g of carbon powder or carbon-supported metal, 1g of conductive graphite, 1g of pore-forming agent, and use 10-100ML of acetic acid Dissolved in ethyl ester for later use;

[0022] 2) uniformly coating the catalyst slurry on one side surface of the carbon-plastic composite material plate by spraying to prepare a catalytic layer;

[0023] 3) Carry out high-temperature vacuum drying treatment on the carbon-plastic composite material plate coated with the catalyst layer. The drying temperature is 90°C, the drying time is 60s, the vacuum degree is -0.01MPa, and the pressure is maintained and the temperature is lowered to room temperature to obtain the electrode product.

Embodiment 2

[0025] 1) Adhesive slurry configuration: in parts by weight, use 1g of chlorinated polypropylene or chlorinated polyethylene, 2g of carbon powder, 2g of conductive graphite, and use 10-100ML of ethyl acetate to dissolve for later use;

[0026] 2) Applying the adhesive slurry evenly on one side surface of the carbon-plastic composite material plate by screen printing to prepare an adhesive layer;

[0027] 3) Bond the carbon cloth to the side of the carbon-plastic composite material plate with the adhesive layer by hot pressing to make an integrated electrode; the hot pressing temperature is 150°C, and the hot pressing pressure is 50kg cm -2 , The hot pressing time is 10s.

[0028] 4) Catalyst layer slurry configuration: by weight parts, weigh 1g of chlorinated polypropylene or chlorinated polyethylene, 3g of carbon powder or carbon-supported metal, 1g of conductive graphite, 1g of pore-forming agent, and use 10-100ML of acetic acid Dissolved in ethyl ester for later use;

[0...

Embodiment 3

[0032] 1) Adhesive slurry configuration: by weight, use 1g of chlorinated polypropylene or chlorinated polyethylene, 5g of carbon powder, 2.5g of conductive graphite, and use 10-100ML of ethyl acetate to dissolve and reserve;

[0033] 2) Using the method of ion sputtering to uniformly coat the adhesive slurry on one side surface of the carbon-plastic composite material plate to prepare an adhesive layer;

[0034] 3) Bond the carbon cloth to the side of the carbon-plastic composite material plate with the adhesive layer by hot pressing to make an integrated electrode; the hot pressing temperature is 200°C, and the hot pressing pressure is 100kg cm -2 , The hot pressing time is 180s.

[0035] 4) Catalyst layer slurry configuration: by weight, weigh 1 g of chlorinated polypropylene or chlorinated polyethylene, 2.5 g of carbon powder or carbon-supported metal, 1 g of conductive graphite, and 1 g of pore-forming agent. Ethyl acetate was dissolved for subsequent use;

[0036] 5) T...

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PUM

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Abstract

The invention relates to a positive electrode of a zinc bromine redox flow battery and a preparation method thereof. The positive electrode comprises a carbon-plastic composite panel, and a catalyst layer which has high specific surface area, is adhered to one side surface of the carbon-plastic composite panel, and consists of a binder, namely chlorinated polypropylene or chlorinated polyethylene, a catalyst, namely activated carbon or carbon-supported metal, and a conductive agent, namely conductive graphite or carbon black. The catalyst layer with the high specific surface area is coated or bonded on a thermoplastic conductive plate made of polypropylene, polyethylene and the like, and high specific surface area and high conductivity are achieved simultaneously, so that the redox activity of positive bromine and the conductivity of the integral positive electrode are improved. Problems of overlarge electrode thickness, battery performance difference caused by carbon felt difference, and the like when the conventional carbon felt electrode is used are solved, and the novel positive electrode of the zinc bromine flow battery can replace the conventional carbon felt electrode.

Description

technical field [0001] The invention relates to a zinc-bromine battery, in particular to a high-performance electrode for a positive electrode of a zinc-bromine redox flow battery and a preparation method thereof. technical background [0002] At present, the positive electrodes of zinc-bromine flow batteries use carbon felts of different thicknesses. Using carbon felts as the positive electrodes of zinc-bromine batteries has the advantages of high specific surface area and high catalytic activity. However, due to the production process of carbon felts, there are differences between individuals Large differences can easily lead to differences in battery performance, and the disadvantages are especially obvious when assembling the battery stack. Moreover, the mechanical properties of carbon felt are poor. When assembling the battery, an additional support needs to be introduced in order to reduce the deformation of the carbon felt, which increases the volume of the battery. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/88H01M4/90
CPCY02E60/50
Inventor 赖勤志张华民刘宗浩张立群
Owner 华秦储能技术有限公司
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