Redox of anionic and cationic radical intermediates in a bipolar polyimide COF for high-performance dual-ion organic batteries

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

14 Scopus Citations
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Author(s)

  • Jingjing Chen
  • Rui Hao
  • Zhiqiang Wang
  • Guiyu Liu
  • Kun Liu
  • Qingmeng Gan
  • Zhiqiang Li
  • Hao Guo
  • Yingzhi Li
  • He Huang
  • Kemeng Liao
  • Zhouguang Lu

Related Research Unit(s)

Detail(s)

Original languageEnglish
Article number139877
Number of pages7
Journal / PublicationChemical Engineering Journal
Volume454
Issue numberPart 1
Online published20 Oct 2022
Publication statusPublished - 15 Feb 2023

Abstract

Bipolar organic materials for dual-ion batteries have attracted immense attention due to the low cost, high theoretical capacity, and potential sustainability. However, the bipolar organic batteries are plagued by low reversible capacity and poor stability. Herein, a novel bipolar polyimide COF with n-type imide units and p-type quaternary nitrogen centers exhibits unique topology structure and is used for dual-ion organic batteries. Detailed analyses reveal that the redox of anionic imide radicals and cationic nitrogen-center radicals was triggered to store the Li+ ions and PF6 anions, respectively, during the charge/discharge processes. Electrolyte engineering demonstrates that the electrolyte additives vinylene carbonate (VC) and fluoroethylene carbonate (FEC) would inactivate the imide units and result in low capacities and poor reversibility of the COF electrodes. With the unique structure and optimized electrolyte, the bipolar COF exhibits high capacity of 165 mAh/g at 30 mA/g and high capacity retention of 91% after 4000 cycles at 1 A/g, surpassing most of the bipolar electrodes. This work not only expands the palette to design bipolar materials for rechargeable batteries but also emphasizes the importance of the matching strategy of electrolytes and organic electrodes.

Research Area(s)

  • Bipolar organic electrodes, Polyimide COFs, Dual-ion organic batteries, Radical intermediates, Matching strategy of electrolytes

Citation Format(s)

Redox of anionic and cationic radical intermediates in a bipolar polyimide COF for high-performance dual-ion organic batteries. / Gu, Shuai; Chen, Jingjing; Hao, Rui et al.
In: Chemical Engineering Journal, Vol. 454, No. Part 1, 139877, 15.02.2023.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review