Extending the π-Conjugation of a Donor-Acceptor Covalent Organic Framework for High-Rate and High-Capacity Lithium-Ion Batteries

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

4 Scopus Citations
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Author(s)

  • Chengqiu Li
  • Ao Yu
  • WenKai Zhao
  • Guankui Long
  • Shilin Mei
  • Chang-Jiang Yao

Detail(s)

Original languageEnglish
Article numbere202409421
Journal / PublicationAngewandte Chemie - International Edition
Volume63
Issue number48
Online published13 Aug 2024
Publication statusPublished - 25 Nov 2024

Abstract

Realizing high-rate and high-capacity features of Lithium-organic batteries is essential for their practical use but remains a big challenge, which is due to the intrinsic poor conductivity, limited redox kinetics and low utility of organic electrode materials. This work presents a well-designed donor-acceptor Covalent Organic Framework (COFs) with extended conjugation, mesoscale porosity, and dual redox-active centers to promote fast charge transfer and multi-electron processes. As anticipated, the prepared cathode with benzo [1,2-b:3,4-b′:5,6-b′′] trithiophene (BTT) as p-type and pyrene-4,5,9,10-tetraone (PTO) as n-type material (BTT-PTO-COF) delivers impressive specific capacity (218 mAh g−1 at 0.2 A g−1 in ether-based electrolyte and 275 mAh g−1 at 0.2 A g−1 in carbonate-based electrolyte) and outstanding rate capability (79 mAh g−1 at 50 A g−1 in ether-based electrolyte and 124 mAh g−1 at 10 A g−1 in carbonate-based electrolyte). In addition, the potential of BTT-PTO-COF electrode for prototype batteries has been demonstrated by full cells of dual-ion (FDIBs), which attain comparable electrochemical performances to the half cells. Moreover, mechanism studies combining ex situ characterization and theoratical calculations reveal the efficient dual-ion storage process and facile charge transfer of BTT-PTO-COF. This work not only expands the diversity of redox-active COFs but also provide concept of structure design for high-rate and high-capacity organic electrodes. © 2024 Wiley-VCH GmbH.

Research Area(s)

  • COFs, Dual-Ion cathode, Lithium Batteries

Citation Format(s)

Extending the π-Conjugation of a Donor-Acceptor Covalent Organic Framework for High-Rate and High-Capacity Lithium-Ion Batteries. / Li, Chengqiu; Yu, Ao; Zhao, WenKai et al.
In: Angewandte Chemie - International Edition, Vol. 63, No. 48, e202409421, 25.11.2024.

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