Preparation And Electrochemical Properties Of Anthraquinones Polymer

Polymer battery is composed of the polymers that can occur redox reactions,which are rich in natural sources.And it has the advantages of safety,non-toxicity,environmentally friendly,high power density and energy density.The redox reaction of the polymer-based organic battery is completed by the self-exchange reaction of the active polymer with ions in the electrolyte,resulting in rapid reaction process.It is a very promising energy storage device.In this paper,low potential poly（1,5-anthraquinone）（P15AQ）and P15AQ/CNTs composite was synthesized.Its structure was characterized and its electrochemical properties were studied.Furthermore,according to the principle of potential matching between positive and negative electrodes,high potential PTPA-PO and PTPA-PO/CNTs composite was synthesized.P15AQ/CNTs with low potential as negative electrode material,high potential PTPA-PO/CNTs as positive electrode material,LiPF₆（EC/DMC,v/v,1:1）as electrolyte,and PMMA-LiPF₆ as gel electrolyte,the all-polymer battery was prepared,which provided new technology and new methods for the development of a new generation of energy storage devices.（1）The P15AQ/CNTs composite was synthesized by in-situ polymerization.The structure of the composite electrode was characterized and the relationship between the structure and the performance was explored.In the composite electrode of P15AQ/CNTs,when the mass ratio of P15AQ and CNT is 6:2,the discharge capacity of the composite electrode is the highest,and the cycle stability and rate performance are the best.The results show that the first discharge specific capacity of the composite electrode is 241.7 mAh g^-1,which is 92.9%of the theoretical specific capacity(theoretical specific capacity is 260 mAh g^-1).After 100 charge-discharge cycles,the specific discharge capacity is 202.5 mA h g^-1,which can maintain 83.7%of the initial capacity.The experimental results of the rate performance of the composite electrode show that the discharge specific capacity is 152.3 mAh g^-1 at a large current density of500 mA g^-1,indicating that the P15AQ/CNTs composite electrode has excellent electrochemical performance.（2）The polymer PTPA-PO was prepared by chemical oxidation method,and the PTPA-PO/CNTs composite was synthesized by in-situ polymerization.A full polymer-based organic battery based on P15AQ/CNTs anode and PTPA-PO/CNTs anode was prepared.The electrochemical performance of the battery was tested using LiPF₆（EC/DMC,v/v,1:1）as electrolyte at a current density of 20 mA g^-1.The experimental results show that the first discharge capacity is 97.6 mAh g^-1.After 100 charge-discharge cycles,the specific discharge capacity of the battery is 81.1 mAh g^-1 and the capacity retention rate is 83.1%.When the current density is 500 mA g-1,the discharge specific capacity is 61.4 mAh g^-1,which indicates that it has excellent rate performance.（3）PMMA-LiPF₆ gel electrolyte was prepared by using Methyl methacrylate（MMA）as monomer,LiPF₆ as electrolyte and 2,2-Dimethoxy-2-phenylacetophenone（DMPA）as photoinitiator under UV irradiation,and a polymer battery based on gel electrolyte was prepared,and its electrochemical performance was explored.Under the current density of 20 mA g^-1 and voltage range of 0.5-2.8 V,the initial discharge specific capacity of the full battery is 87.6 mAh g^-1.After 100 charge and discharge cycles,the discharge specific capacity is 70.1 mAh g^-1,which is about 80%of the initial specific capacity,showing good cycle stability.