Issue 33, 2019

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

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

Supplementary files

Article information

Article type
Edge Article
Submitted
14 may 2019
Accepted
14 iyn 2019
First published
18 iyn 2019
This article is Open Access

All publication charges for this article have been paid for by the Royal Society of Chemistry
Creative Commons BY-NC license

Chem. Sci., 2019,10, 7695-7701

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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