Interfacial engineering of perfluoroalkyl functionalized covalent organic framework achieved ultra-long cycled and dendrite-free lithium anodes
作者机构：International Joint Research Center for Advanced Energy Materials of Yunnan ProvinceYunnan Key Laboratory of Carbon Neutrality and Green Low-carbon TechnologiesSchool of Materials and EnergyYunnan UniversityKunming 650091China
出 版 物：《Nano Research》 (纳米研究（英文版）)
年 卷 期：2023年第16卷第7期
页 面：9289-9298页
核心收录：
基 金：The authors acknowledge financial supports provided by the National Natural Science Foundation of China(No.52064049) Key Laboratory of Solid-State Ions for Green Energy of Yunnan University(2019) Analysis and Measurements Center of Yunnan University for the sample testing service,the Electron Microscope Center of Yunnan University for the support of this work the Postgraduate Research and Innovation Foundation of Yunnan University(No.KC-22221440)
主 题：perfluoroalkyl-functionalized covalent organic framework(COF-F6) artificial solid electrolyte interface strong electronwithdrawing effect dendrite-free lithium metal anode
摘 要：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’)***,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 *** 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 *** 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 *** a result,the perfluoroalkyl COF-F6 modified LMB presents outstanding cycling *** 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 ***,this dendrite-free protection tactic holds broad prospects for the practical application of Li metal anodes.
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