Engineering nitrogen-rich quinazoline-based porous organic polymer coating on Zn anodes for highly stable aqueous zinc metal batteries

The severe dendrite growth and complex by-products of zinc metal anodes greatly hinder the development of aqueous zinc-ion batteries (AZIBs). In this paper, a nitrogen-rich quinazoline-based porous organic polymer coating (hexaazatriph-enylenehexacarbonitrile-800, HAT-CN-800) was prepared to solve these problems. The HAT-CN-800 coating can adjust the uniform Zn 2+ transport path to achieve uniform zinc deposition. In addition, abundant zincophilic N sites enhance the deposition kinetics of Zn 2+ . Therefore, with the HAT-CN-800 coating providing protection, the symmetrical cell can sustain a service life of over 2000 h at a current density of 0.5 mA cm −2 , which is approximately 10 times longer than the lifespan of the bare zinc anode. In addition, the full cell assembled with ammonium vanadate still operates normally after 1000 cycles, which is better than the bare zinc anode. This study offers a hopeful approach to design porous organic polymer coatings to solve the anode problem of AZIBs.