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Highly conjugated poly(N-heteroacene) nanofibers for reversible Na storage with ultra-high capacity and a long cycle life

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Abstract

Rechargeable Na-ion batteries based on redox-active polymers are highly desirable for the next generation of “green batteries”. This study offers a simple and effective approach for the development of high performance organic anodes by introducing aromatic N atoms into conducting polymer backbones. Herein, for the first time, cyclized polyacrylonitrile (cPAN) is studied as a model of N-containing polyacene (PAc) and investigated as a novel organic anode. Benefiting from the highly conjugated backbones with rich C[double bond, length as m-dash]N groups, the cPAN nanofibers demonstrate superior Na storage performances including high reversible capacity (527 mA h g−1 at 50 mA g−1), outstanding rate capability (200 mA h g−1 at 5 A g−1) and an ultra-long lifespan (capacity retention of 99.4% over 3500 cycles). Ex situ structural characterization combined with theoretical calculations reveals that the introduction of aromatic N atoms with lone pair electrons could not only reduce the energy gaps of the PAc backbones, but also act as the redox-active centers. The results are promising and may pave the way towards the rational design of novel redox-active polymers for various energy storage applications.

Graphical abstract: Highly conjugated poly(N-heteroacene) nanofibers for reversible Na storage with ultra-high capacity and a long cycle life

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Publication details

The article was received on 12 Jul 2018, accepted on 03 Sep 2018 and first published on 03 Sep 2018


Article type: Paper
DOI: 10.1039/C8TA06724D
Citation: J. Mater. Chem. A, 2018, Advance Article
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    Highly conjugated poly(N-heteroacene) nanofibers for reversible Na storage with ultra-high capacity and a long cycle life

    T. Gu, M. Zhou, B. Huang, M. Liu, X. Xiong, K. Wang, S. Cheng and K. Jiang, J. Mater. Chem. A, 2018, Advance Article , DOI: 10.1039/C8TA06724D

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