Design,Synthesis And Energy Storage Of New Quinone Polymer Composites

As a potential new energy storage device,supercapacitor has been attracting a lot of attention and research due to its advantages such as long cycle life,high power density,safety and environmental protection,low cost and so on.However,the energy density is relatively low compared to traditional secondary batteries.As a key factor to improve the energy density of supercapacitors,the development of high-performance energy storage electrode materials has always been the focus and difficulty of research.Among them,conductive polymer materials(such as polyaniline,polyanthraquinone,polypyrrole,etc.)have attracted much attention due to their high theoretical specific capacitance,excellent rate performance,a wide range of natural sources and other advantages.This paper aims to prepare a new type of high-performance flexible polyaminanthraquinone electrode material with controllable morphology.The main research contents are as follows:1.In this work,we used interfacial polymerization method to prepare polyaminoanthraquinone electrode materials with different morphologies such as nanoparticle,rod,strip and sheet.Nanoparticles of polyaminoanthraquinone were prepared by the reaction between anthraquinone monomer and oxidant at the two-phase interface.Nano-rod-shaped polyaminoanthraquinone materials were prepared by the solubility difference of anthraquinone monomers in different organic phases.By introducing surfactant as soft template,poly(aminoanthraquinone)nanomaterials in strip and sheet form were prepared.The electrochemical properties of polyaminoanthraquinones are different because of their different microstructure.The nanostrip polyaminanthraquinone electrode has the best electrochemical performance,which has a high specific capacitance of 137 F g^-1at the current density of 1A g^-1,and the capacitance retention rate can reach 89.76%after 10,000charge-discharge cycles.This work reveals the influence of the morphology of polyaminanthraquinone electrode material on its electrochemical properties.2.In this work,we first used cetyltrimethyl ammonium bromide(CTAB)intercalation to modify GO,and successfully prepared modified GO(CGO)which could be stably dispersed in organic system for more than 48 h,thus solving the problem of poor dispersion of GO conductive substrate in anthraquinone polymerization system.Thanks to the abundant functional groups on the surface of GO,the aminoanthraquinone monomer can be firmly and uniformly anchored on the surface of CGO,which is used as the starting point for chemical oxidation polymerization,and finally the polyaminoanthraquinone/modified GO composite electrode material(PDAAQ/CGO)is prepared.The specific capacitance of the material is 760F g^-1at 1A g^-1,and the capacitance retention rate is 90.4%after 10000 cycles of charge and discharge.On this basis,the kinetics of PDAAQ/CGO electrode was analyzed.The results show that the energy storage mechanism is mainly controlled by the surface,and the contribution rate of pseudocapacitance is 84%at 50 m V s^-1sweep speed.Finally,we tested the practical application value of the electrode material,using PDAAQ/CGO as the negative electrode and nitrogen doped activated carbon as the positive electrode to assemble the supercapacitor device.It has an energy density of 41 Wh kg^-1at a power density of 1000 W kg^-1and can successfully light 38 small LED bulbs in series.3.In order to prepare flexible integrated self-supporting electrode,in this work,flexible graphene-polyaminoanthraquinone/Mxenes(CGO-PDAAQ/MXenes)composite electrode was prepared by electrostatic self-assembly using graphene-coated band-like polyaminoanthraquinone as active material and layered MXenes as conductive substrate.The flexible electrode has good mechanical properties and can be completely recovered after 500bending tests.It can be used as an independent electrode without the aid of external conductive agent and binder.Electrochemical tests show that the area specific capacitance at 1A g^-1(unit conversion)current density is as high as 776 m F cm^-2,which is in the leading position among similar electrode materials reported.The supercapacitor was assembled in 1M H₂SO₄electrolyte using the electrode as the negative electrode and the reduced graphene oxide as the positive electrode.When the power density is 803W kg^-1,the energy density of the assembled flexible asymmetric capacitor is as high as 81 Wh kg^-1.