Conjugated polymers such as poly-thiophene, pyrrole and aniline provide attractive components in organic matter based electrode materials due to their environmental friendliness, eco-efficient production process, as well as readily accessible resources. Thiophene-based conducting polymers display both n-doping and p-doping properties, good mechanical and cycling stability, and this type of material has been used in batteries, capacitors and other electrical devices [1-3]. The polythiophene can be n-doped as low as about 1.0V vs Li/Li+ and introduces a potential application as anode material for electrical energy storage. However, the charge storage capacity of polythiophene by itself is inferior to current commercial anode materials used in rechargeable batteries. A thiophene-based polymer with a capacity-carrying terephthalate pending group has been successfully synthesized in this study. This material was inspired by the electrochemistry studies of both polythiophene and single molecule terephthalate. The pended terephthalate group on polythiophene was expected to give a fast redox conversion in the polymer conducting region as a �charge tank�. The redox potential matching of the pendant and polymer chain has been supported by recent computational studies, and the experimental cyclic voltammetry of this redox polymer shows that the terephthalate group can be reversibly cycled at high rates.[1] F. Rosciano, M.M. Salamone, Riccardo Ruffo, M. Sassi, L. Beverina, J. Electrochem. Soc. 160 (2013) A1094-A1098.[2] T.F. Otero, J. Arias-Pardilla, H. Herrera, J.L. Segura, C. Seoane, Phys. Chem. Chem. Phys. 13 (2011) 16513�16515.[3] C.Y. Wang, A.M. Ballantyne, S.B. Hall, C.O. Too, D.L. Of?cer, G.G. Wallace, J. Power Sources 156 (2006) 610�614.

Novel n-type thiophene-based terephthalate redox polymer for energy storage

248th National Meeting (2014)

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