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.