Syntheses And Applications Of Quinone-amine Polymers And Their Composite Materials For Aqueous Zinc Ion Battery

Aqueous Zinc ion batteries(ZIBs)are considered as a potential energy storage device due to their high safety and low cost.Traditional inorganic materials were limited by theoretical specific capacity and are difficult to satisfy production requirements.Organic materials will become the focus of future electrode material development due to the advantages of strong molecular design and good plasticity.Among them,organic quinone amine materials as ZIBs electrode materials have the advantages of strong molecular design,good redox properties,and continuous regeneration.In this experiment,quinone-amine monomer(AQ)and quinone-amine polymer(PAQ)were designed and synthesized by Michael addition reaction.They were used to ZIBs cathode materials to conduct electrochemical performance research.In addition,the factors of temperature and carbon materials’ additive amount were explored.The content is as follows:First,p-benzoquinone was reacted with methylamine,aniline,ethylenediamine,o-phenylenediamine,p-phenylenediamine and benzidine respectively to synthesize two quinone amine monomer compounds and four quinone amine polymers.Among them,AQ-1 and AQ-2 are unstable in the electrolyte due to theirs small molecular weights.The fatty chain structure of ethylenediamine causes the product to fold easily to form larger particles.The products of PAQ-3 and PAQ-4 have poor conductivity.The polymer(PAQ-2)produced by the reaction of p-benzoquinone with o-phenylenediamine has a discharge capacity of 105.9 mAh/g for the first cycle.In the process of exploring the effect of temperature on the electrochemical performance of PAQ-2,it was found that the product(PAQb)at a reaction temperature of 40°C had a high discharge capacity of 162.5 m Ah/g at 0.1 C and had the discharge capacity is114 mAh/g after 100 cycles at 0.1C with the 70% retention.Secondly,the CNT@PAQb composite material was generated by in-situ surface polymerization.When the amount of CNT added was 11.4% of the mass of thereactant(p-benzoquinone and o-phenylenediamine),the discharge capacity reached126.6 mAh/g after cycling 100 cycles at 0.1C with the 77.9% retention.The specific discharge capacity rate can still reach 150.8mAh/g at 0.1C that after high-rate charge and discharge,with excellent rate performance and reversibility.Finally,explore the composite and electrochemical properties of biomass carbon material(PCC)with PAQb.PAQb can be composited uniformly on the surface of PCC.The infrared spectroscopy characterization and scanning results showed that PCC and PAQb can be combined.When PCC is added in the amount of reactant(p-benzoquinone and O-phenylenediamine)at a mass of 10.9%,the specific capacity of the synthesized composite material is as high as 152 m Ah/g at 0.1C rate,which is good for charging and discharging at a small rate.