Covalent Bonding of MXene/COF Heterojunction for Ultralong Cycling Li-Ion Battery Electrodes

Jun 27, 2024Molecules (Basel, Switzerland)

Strong Chemical Bonding of MXene and COF Materials for Long-Lasting Lithium-Ion Battery Electrodes

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Abstract

The TiC-supported 3D covalent organic framework (COF) nanosheets achieve a specific capacity of 490 mAh g at 0.1 A g.

Covalent bonding between the COF and TiC enhances stability and conductivity.
The unique 3D cavity structure of the composite allows for stable lithium storage and rapid ion transport.
The TiC@COF composite demonstrates an ultralong cyclability of 10,000 cycles at 1 A g.
Challenges such as low active site availability and poor electronic conductivity in COFs may be addressed through this approach.

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Covalent organic frameworks (COFs) have emerged as promising renewable electrode materials for LIBs and gained significant attention, but their capacity has been limited by the densely packed 2D layer structures, low active site availability, and poor electronic conductivity. Combining COFs with high-conductivity MXenes is an effective strategy to enhance their electrochemical performance. Nevertheless, simply gluing them without conformal growth and covalent linkage restricts the number of redox-active sites and the structural stability of the composite. Therefore, in this study, a covalently assembled 3D COF on TiCMXenes (TiC@COF) is synthesized and serves as an ultralong cycling electrode material for LIBs. Due to the covalent bonding between the COF and TiC, the TiC@COF composite exhibits excellent stability, good conductivity, and a unique 3D cavity structure that enables stable Listorage and rapid ion transport. As a result, the TiC-supported 3D COF nanosheets deliver a high specific capacity of 490 mAh gat 0.1 A g, along with an ultralong cyclability of 10,000 cycles at 1 A g. This work may inspire a wide range of 3D COF designs for high-performance electrode materials. 3 2 3 2 3 2 3 2 3 2 + -1 -1 -1

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Covalent Bonding of MXene/COF Heterojunction for Ultralong Cycling Li-Ion Battery Electrodes

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