@article{Yang2023, 
author = {Yongxin Yang and Conghui Zhang and Zhiyuan Mei and Yongjiang Sun and Qi An and Qi Jing and Genfu Zhao and Hong Guo},
title = {Interfacial engineering of perfluoroalkyl functionalized covalent organic framework achieved ultra-long cycled and dendrite-free lithium anodes},
year = {2023},
journal = {Nano Research},
volume = {16},
number = {7},
pages = {9289-9298},
keywords = {perfluoroalkyl-functionalized covalent organic framework (COF-F6), artificial solid electrolyte interface, strong electron-withdrawing effect, dendrite-free, lithium metal anode},
url = {https://www.sciopen.com/article/10.1007/s12274-023-5534-0},
doi = {10.1007/s12274-023-5534-0},
abstract = {The finite lithium-ion utilization, short cycling life, and lower capacity retention caused by irreversible dendrite growth become the maximum dilemma in lithium metal batteries’ (LMBs’) commercialization. Herein, a perfluoroalkyl-functionalized covalent organic framework (COF-F6) equipped with high stability and supernal proton conduction is introduced as an artificial solid electrolyte interface to stable the lithium metal anode. Benefiting from the strong electron-withdrawing effect of perfluoroalkyl, Li+ will be freed more by the competition of electronegative fluorine (F) and bis(trifluoromethanesulphonyl)imide anion (TFSI−). The dissociation of LiTFSI and process of Li+ desolvation are easier to achieve. In addition, high electronegative fluorine can also regulate local electron-cloud density to induce the fast immigration of Li+. All the above roles contribute to improving the Li+ transfer number (0.7) and achieving the goal of inhibiting Li dendrite. As a result, the perfluoroalkyl COF-F6 modified LMB presents outstanding cycling stability. The symmetric batteries accomplish an overlong life-span of more than 5000 h with a lower hysteresis voltage (11 mV) at 5 mA·cm−2. Also, no dendrites are observed when using an in-situ optical microscope to learn the process of Li deposition. Therefore, this dendrite-free protection tactic holds broad prospects for the practical application of Li metal anodes.}
}