A Dithiin-Linked Covalent Organic Polymer for Ultrahigh Capacity Half-Cell and Symmetric Full-Cell Sodium-Ion Batteries

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  • Shen Xu
  • Chenchen Wang
  • Huiying Yao
  • Jie Yang
  • Jia Zhu


Original languageEnglish
Article number2304497
Journal / PublicationAdvanced Science
Issue number32
Online published25 Sept 2023
Publication statusPublished - 14 Nov 2023



Sodium ion-batteries (SIBs) are considered as a class of promising alternatives to lithium-ion batteries (LIBs) to overcome their drawbacks of limited sources and safety problems. However, the lack of high-performance electrode materials hinders the wide-range commercialization of SIBs. Comparing to inorganic counterparts, organic electrode materials, which are benefitted from flexibly designable structures, low cost, environmental friendliness, and high theoretical gravimetric capacities, should be a prior choice. Here, a covalent organic polymer (COP) based material (denoted as CityU-9) is designed and synthesized by integrating multiple redox motifs (benzoquinone and thioether), improved conductivity (sulfur induction), and intrinsic insolubility (rigid skeleton). The half-cell SIBs exhibit ultrahigh specific capacity of 1009 mAh g−1 and nearly no capacity drop after 650 cycles. The first all-COP symmetric full-cell shows high specific capacity of 90 mAh g−1 and excellent rate capability. This work can extend the selection of redox-active moieties and provide a rational design strategy of high-performance novel organic electrode materials. © 2023 The Authors. Advanced Science published by Wiley-VCH GmbH.

Research Area(s)

  • covalent organic polymers, dithiin linkage, Na-ion batteries, Na-ion storage mechanism, organic electrodes, symmetric full-cells

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