Preparation and Electrochemical Properties of Trianiline-Pyrrole Polymers with Super Cyclic Stability and High Rate Performance
A series of polymer materials PTPA&PPy-1∶1,PTPA&PPy-3∶1,PTPA&PPy-10∶1,PTPA&PPy-20∶1 of pyrrole and trianiline composite with different feeding ratios were prepared by in situ chemical oxidation method,using ferric chloride as oxidant,and the copolymer was used as cathode material for lithium battery.Its electrochemistry and battery performance were studied.FTIR indicated the successful preparation of composite PTPAP&PPy,PTPAP&PPy copolymer showed different morphologies with the change of feeding ratio,PTPA&PPy-20∶1 material showed a"nickel mesh"morphology.In cyclic voltammetry test,the introduction of pyrrole monomer significantly reduced the potential difference of oxidation/reduction peaks and decreased electrode polarization.As a cathode material for lithium ion batteries,the copolymer electrode material prepared by pyrrole with trianiline had stable cyclic performance.When the battery performance was tested at different current rates,the capacity retention rates of PTPA&PPy-1∶1 and PTPA&Ppy-20∶1 were 94％and 96％respectively,which were significantly higher than those of PTPA,especially when the current rate was 800 mA·g-1.PTPA&Ppy-20∶1 had a higher specific capacity of 73.2 mA·h·g-1 than PTPA's 68.1 mA·h·g-1,with stable rate performance.This was due to the introduction of pyrrole material and the open pore structure,which improved the carrier transmission process.At the same time,impedance measurement showed that the composite material had lower charge transfer impedance.This indicated that the addition of appropriate pyrrole could improve the electron transfer rate and high charge/discharge efficiency,which can provide a new idea for the development of cathode materials for energy storage devices.
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