Study On Cathode Materials For High Potential Organic Batteries Based On Indole And Phenothiazine Heterocyclic Compounds

Organic compounds are widely concerned by scholars because of their advantages such as resource sustainability,structural adjustability,and potential low cost.Compared with inorganic electrode materials,the operating voltage of most organic cathode materials is relatively low,which will affect the energy density and power density of the battery,thus affecting the application of organic battery active materials in the batteries.At present,there are two main ways to improve the potential of organic electrode materials.Our work will also be carried out from the two aspects?(1)We proposed a strategy to improve the discharge voltage of conjugated organic cathode materials by diluting the electron density in the ?-conjugated skeleton.Compared with electron-rich compounds with nitrogen hexatomic rings as redox centers,the atomic-dipole-moment-corrected Hirshfeld(ADCH)charge population indicates that replacing the conventional redox-active hexatomic ring with a pentatomic ring results in effective dilution of the electron density and thus an increased redox potential.Experimental results showed that the designed carbazole-based polymer shows a high discharge voltage between 3.7 and 4.3 V vs.Li+/Li,and has good cycle performance.This strategy can be applied to the design of other redox centers high-voltage organic electrode materials.(2)We adjusted the potential of the organic electrode material by introducing different organic functional groups based on the existing organic active material.N-phenyl-phenothiazine has good redox reversibility,stability and high working voltage.Based on phenyl-phenothiazine,we introduced different types and numbers of electron-drawing groups at different positions to improve the working potentials of their derivatives.The experimental results showed that the introduction of electronic functional groups such as ester groups and halogens at different sites effectively improves the working potential of organic active materials.