Volume 136, Issue 48 e202409421
Forschungsartikel

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

Chengqiu Li

Chengqiu Li

State Key Laboratory of Explosion Science and Safety Protection, School of Mechatronical Engineering, Beijing Institute of Technology, Beijing, 100081 China

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Ao Yu

Ao Yu

State Key Laboratory of Explosion Science and Safety Protection, School of Mechatronical Engineering, Beijing Institute of Technology, Beijing, 100081 China

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WenKai Zhao

WenKai Zhao

School of Materials Science and Engineering, National Institute for Advanced Materials, Renewable Energy Conversion and Storage Center (RECAST), Nankai University, Beijing, 100081 China

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Prof. Guankui Long

Prof. Guankui Long

School of Materials Science and Engineering, National Institute for Advanced Materials, Renewable Energy Conversion and Storage Center (RECAST), Nankai University, Beijing, 100081 China

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Prof. Qichun Zhang

Prof. Qichun Zhang

Department of Materials Science and Engineering, City University of Hong Kong, Hong Kong SAR, 999077 China

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Prof. Dr. Shilin Mei

Corresponding Author

Prof. Dr. Shilin Mei

State Key Laboratory of Explosion Science and Safety Protection, School of Mechatronical Engineering, Beijing Institute of Technology, Beijing, 100081 China

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Prof. Dr. Chang-Jiang Yao

Corresponding Author

Prof. Dr. Chang-Jiang Yao

State Key Laboratory of Explosion Science and Safety Protection, School of Mechatronical Engineering, Beijing Institute of Technology, Beijing, 100081 China

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First published: 13 August 2024

Abstract

Realizing high-rate and high-capacity features of Lihium-organic batteries is essential for their practical use but remains a big challenge, which is due to the instrinsic poor conductivity, limited redox kinetics and low utility of organic electrode mateials. 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.

Conflict of Interests

The authors declare no conflict of interest.

Data Availability Statement

The data that support the findings of this study are available on request from the corresponding author. The data are not publicly available due to privacy or ethical restrictions.

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