Research And Application Of Polyaniline Carbon-based Composite Electrode Materials In Supercapacitors

As a kind of important supercapacitor material,conductive polymer is rapidly becoming a hot material in this field due to its easy availability of raw materials and excellent performance.Polyaniline?PANI?is becoming one of the most concerned conductive polymers becauseof its advantages of easy availability,simple synthesis and high conductivity.However,due to the instability of its internal mechanical properties,the cyclic stability is seriously affected.Therefore,improving the stability of PANI-based supercapacitors during long-term cycling is the main challenge for PANI-based electrode materials.As a smart material,one kind of self-healing polymer?SHP?with the ability of reverting hydrogen bond can repair the structural damage and reduce the electronic contact loss caused by the volume change and structural damage of PANI.The main research contents and innovations of this thesis are as follows:1.The structure stability of the composite was enhanced by compounding PANI with graphene oxide?GO?,and a the self-healing polymer?SHP?was added to reconstruct the contact between the PANI nanostructure and the electrode.The cyclic stability of PANI based all-solid supercapacitors would get great degree of improvemnet with these two methods.2.Aniline Tetramer?AT?and the composite materials with GO added?AT-GO?were synthesized with Aniline dimer?AD?as the precursor.The AT-GO based devices exhibited very good cycling stability in the presence of SHP with a capacitance retention of 97.5%after 9000 cycles and a specific capacity of 143.2 F g^-11 at 0.5 A g^-1,indicating that has good electrochemical properties.3.PANI-CNT composites were synthesized by PANI and carbon nanotubes?CNTs?.The PANI-CNT composites exhibited excellent supercapacitance in the three-electrode test system.Using PANI-CNT as an active material and assembled into a flexible device,the ultracapacitor and flexure test were carried out.The results showed that not only the capacitive properties but also the flexibility of the devices were further improved.Several achievements have shown that this work has a deep understanding cyclic stability of PANI-based electrodes,and proposes a strategy of using SHP and shortening the length of the polymer chain to improve the electrochemical stability.At the same time,preliminary research on the related flexible supercapacitor has been made.It provides a new reference method for improving the stability of PANI and has important significance for its practical application.