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      A Crystalline, 2D Polyarylimide Cathode for Ultrastable and Ultrafast Li Storage.

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          Abstract

          Organic electrode materials are of long-standing interest for next-generation sustainable lithium-ion batteries (LIBs). As a promising cathode candidate, imide compounds have attracted extensive attention due to their low cost, high theoretical capacity, high working voltage, and fast redox reaction. However, the redox active site utilization of imide electrodes remains challenging for them to fulfill their potential applications. Herein, the synthesis of a highly stable, crystalline 2D polyarylimide (2D-PAI) integrated with carbon nanotube (CNT) is demonstrated for the use as cathode material in LIBs. The synthesized polyarylimide hybrid (2D-PAI@CNT) is featured with abundant π-conjugated redox-active naphthalene diimide units, a robust cyclic imide linkage, high surface area, and well-defined accessible pores, which render the efficient utilization of redox active sites (82.9%), excellent structural stability, and fast ion diffusion. As a consequence, high rate capability and ultrastable cycle stability (100% capacity retention after 8000 cycles) are achieved in the 2D-PAI@CNT cathode, which far exceeds the state-of-the-art polyimide electrodes. This work may inspire the development of novel organic electrodes for sustainable and durable rechargeable batteries.

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          Author and article information

          Journal
          Adv Mater
          Advanced materials (Deerfield Beach, Fla.)
          Wiley
          1521-4095
          0935-9648
          Jul 2019
          : 31
          : 28
          Affiliations
          [1 ] Center for Advancing Electronics Dresden (cfaed) and Department of Chemistry and Food Chemistry, Technische Universität Dresden, 01062, Dresden, Germany.
          [2 ] Chair of Bioanalytical Chemistry, Technische Universität Dresden, 01062, Dresden, Germany.
          [3 ] School of Science and Technology, Nottingham Trent University, Clifton Lane, Nottingham, NG11 8NS, UK.
          Article
          10.1002/adma.201901478
          31099072
          3f8a6842-4de2-471f-8cbd-622701b94f80
          © 2019 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
          History

          cathode,2D polymer,covalent organic frameworks,Li-ion batteries,polyarylimide

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