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Issue 33, 2019
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Pore-size dominated electrochemical properties of covalent triazine frameworks as anode materials for K-ion batteries

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Abstract

Two homologous covalent triazine frameworks (CTFs) have been developed for the first time as anode materials for high performance K-ion batteries (KIBs). The two-dimensional sheet-like structure as well as the regular channels in CTFs enable the process of intercalation/deintercalation of K-ions into/from the CTF interlayers reversibly. Particularly, a size effect of the porous structure is found to dominate the K-ion storage behavior. CTF-0 with a smaller pore size displays a higher K-ion storage capacity than CTF-1. Molecular simulations reveal the operation mechanism, showing that the depotassiation process in CTF-0 is exothermic while the depotassiation in CTF-1 is endothermic, which makes the deintercalation of K-ions from CTF-0 more feasible than from CTF-1 and contributes to the higher reversible capacity of CTF-0. This work provides a promising strategy for rational design of high-performance organic anode materials by structural modulation at the molecular scale.

Graphical abstract: Pore-size dominated electrochemical properties of covalent triazine frameworks as anode materials for K-ion batteries

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Publication details

The article was received on 14 May 2019, accepted on 14 Jun 2019 and first published on 18 Jun 2019


Article type: Edge Article
DOI: 10.1039/C9SC02340B
Chem. Sci., 2019,10, 7695-7701
  • Open access: Creative Commons BY-NC license
    All publication charges for this article have been paid for by the Royal Society of Chemistry

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    Pore-size dominated electrochemical properties of covalent triazine frameworks as anode materials for K-ion batteries

    S. Li, W. Li, X. Wu, Y. Tian, J. Yue and G. Zhu, Chem. Sci., 2019, 10, 7695
    DOI: 10.1039/C9SC02340B

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