Research Of Porous Organic Polymers As The Anode Materials Of Zinc Ion Hybrid Capacitors

On account of the low cost,intrinsic non-flammability,environmental friendliness,and high energy with power density,aqueous zinc-ion hybrid capacitors（ZIHCs）has been regarded as an energy storage devices for grid-scale energy storage.Nowadays,most of ZIHCs apply zinc metal as an anode.However,during the process of Zn ion stripping/plating,the Zn dendrite growth and the huge volume change limits the application of Zn metal anodes for ZIHCs.Porous organic polymer is a kind of polymer composed of many non-mental elements with lower molecule weight,such as C/H/O/N,which possess the advantages of lower density,higher specific surface area,larger pore volume,adjustable pore size and strong modifiability.Porous organic polymer has been widely used in the fields of gas separation and adsorption,chemical sensing,environment,electrochemistry and so on.To better explore the application performance of porous organic polymer materials in electrochemical energy storage,a polyarylimide and porphyrin based porous organic polymer was developed as anode for the application of ZIHC.The first chapter briefly summarizes the research background of this paper from the types of organic porous polymers,the electrochemical application of organic porous polymers and the research progress of zinc ion capacitors,and puts forward the necessity and significance of the research.In second chapter,polyarylimide and porphyrin based polyimide organic porous polymer material was synthesized by solvothermal method,and the structure and properties of the synthesized organic porous polymer were characterized by solid-state NMR,IR,SEM,TGA,nitrogen adsorption and desorption experiments.The material shows excellent thermal stability and large specific surface area,and the material can still maintain 90%of the mass at 300℃,while the shape is diameter 1–2μM,with an average pore diameter of 2.3 nm.In third chapter,the energy storage behavior of zinc ions in polyarylimide and porphyrin based polyimide organic porous polymer was investigated by using cyclic voltammetry,constant current charge discharge,electrochemical AC impedance spectroscopy,kinetic analysis and density functional theory.This anode material showed an energy density of 48 Wh kg^-1when used as a zinc ion hybrid electric container,and can still maintain more than 90%capacity after 1100 cycles.