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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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Supplementary files

Article information


Submitted
14 May 2019
Accepted
14 Jun 2019
First published
18 Jun 2019

This article is Open Access
All publication charges for this article have been paid for by the Royal Society of Chemistry

Chem. Sci., 2019,10, 7695-7701
Article type
Edge Article

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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