A zinc-bromine flow battery carbon plastic bipolar plate and a preparation method and application thereof

By using nitrogen-doped hollow carbon nanotubes on the positive electrode side and boron-nitrogen co-doped carbon on the negative electrode side of the zinc-bromine flow battery, the problems of bromine permeation and zinc dendrite growth were solved, thus improving the battery's efficiency and lifespan.

CN122025691BActive Publication Date: 2026-06-23XIAN THERMAL POWER RES INST CO LTD +1
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Patent Information

Application Number
CN202610489997.4
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2026-04-14
Publication Date
2026-06-23
Estimated Expiration
2046-04-14

AI Technical Summary

Technical Problem

Zinc-bromine flow batteries suffer from problems such as bromine permeation, slow bromine kinetics, and zinc dendrite growth, resulting in low coulombic efficiency, low voltage efficiency, low energy efficiency, and short cycle life.

Method used

Nitrogen-doped hollow carbon nanotubes (NC-HNBs) were used to modify the positive electrode side, which accelerated the redox reaction of bromine and physically confined bromine species through nitrogen doping sites. On the negative electrode side, boron-nitrogen co-doped carbon (BNC) material was used to form zinc-loving sites to guide the uniform nucleation of zinc ions and inhibit dendrite growth.

Benefits of technology

It significantly improves the coulombic efficiency, voltage efficiency, and energy efficiency of zinc-bromine flow batteries, extends the cycle life and safety of the batteries, and achieves virtuous cycle through functional partitioning modification of positive and negative electrodes.

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Abstract

This invention discloses a carbon-plastic bipolar plate for a zinc-bromine flow battery, its preparation method, and its application, belonging to the field of electrochemical energy storage technology. The method includes: dispersing nitrogen-doped hollow carbon nanotubes and spraying them onto the positive electrode side of a carbon-plastic bipolar plate; after drying, a nitrogen-doped hollow carbon nanotube-modified positive electrode carbon-plastic bipolar plate is obtained; dispersing boron-nitrogen co-doped carbon and spraying it onto the negative electrode side of a pretreated carbon-plastic bipolar plate, after drying again, a boron-nitrogen co-doped carbon-plastic negative electrode carbon-plastic bipolar plate is obtained. On the positive electrode side, the nitrogen-doped hollow carbon nanotubes catalyze the bromine reaction through nitrogen doping, reducing the overpotential; the hollow structure adsorbs bromine species and uses charge action to inhibit bromine permeation, reducing self-discharge. On the negative electrode side, the boron-nitrogen co-doped carbon uses B-N zinc-loving sites to guide uniform and dense zinc deposition, inhibiting dendrite formation; and inhibits hydrogen evolution through charge regulation. Both methods synergistically improve the bromine barrier performance, reaction kinetics, and dendrite suppression ability of the carbon-plastic bipolar plate.
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