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- Title
A novel covalent organic framework with high-density imine groups for lithium storage as anode material in lithium-ion batteries.
- Authors
Zhao, Huizi; Luo, Derong; Xu, Hai; He, Wenjie; Ding, Bing; Dou, Hui; Zhang, Xiaogang
- Abstract
A novel hexaaminobenzene-based triangular topology covalent organic framework (HAB-COF) was first synthesized and studied as an anode material in the lithium-ion batteries. Benefiting from its conjugated structure and high-density C=N groups designed in the skeleton, the electrons transport and insertion/extraction of metal ions in HAB-COF got effectively promoted. Remarkably, upon a capacity-increasing and/or activation process, the HAB-COF organic electrode delivered high reversible capacities and excellent cycle life with a specific capacity of 1255 mAh g−1 at 1 A g−1 after 1100 cycles. Based on the analysis of cycled electrodes at different cycles, a stepwise-deepen thirty-electron lithiation mechanism of the covalent organic framework was speculated involving C=N bonds and steadily activated aromatic C=C groups. This work proves the potential of structure-designed COFs as electrode materials for high-capacity lithium-ion batteries, as well as deepens the fundamental understanding of storage mechanism. A novel covalent organic framework (HAB-COF) with high-density imine groups is synthesized and studied as an anode in the lithium-ion batteries. Upon a capacity-increasing process, the HAB-COF organic electrode delivers excellent cycle performance with a specific capacity of 1255 mAh g−1 at 1 A g−1 after 1100 cycles and even 1927 mAh g−1 at 0.1 A g−1. A thirty-electron lithiation mechanism involving C=N and aromatic C=C groups is proposed for the HAB-COF.
- Subjects
LITHIUM-ion batteries; LITHIUM; ANODES; ELECTRON transport; METAL ions; CONJUGATED polymers
- Publication
Journal of Materials Science, 2022, Vol 57, Issue 22, p9980
- ISSN
0022-2461
- Publication type
Article
- DOI
10.1007/s10853-022-07115-w