Positive electrode of zinc bromine redox flow battery and preparation thereof

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. ...

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.