Charge regulation by ferromagnetic metal/LiF spin-polarized interface for high-performance Li metal anodes  

作　　者：Ming-Yang Feng Shuang Zhou Yi-Fang Zhang Ya-Ping Wang Chun-Yan Fu Jian-Wen Li Yuan-Lang Wan Zhi-Jia Zhang Yong Jiang An-Qiang Pan 

机构地区：[1]State Key Laboratory of Powder Metallurgy,School of Materials Science and Engineering,Central South University,Changsha,410083,China [2]State Key Laboratory of Separation Membranes and Membrane Processes,Tianjin Key Laboratory of Advanced Fibers and Energy Storage,School of Material Science and Engineering,Tiangong University,Tianjin,300387,China [3]School of Materials Science and Engineering,Hebei University of Technology,Tianjin,300130,China

出　　处：《Rare Metals》2024年第3期995-1005,共11页稀有金属（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(No.52002270);the China Postdoctoral Science Foundation(No.2020M670661)。

摘　　要：The interfacial characteristics of the Li metal anode(LMA)play a crucial role in its overall performance.Despite various materials being applied to modify the interface,a comprehensive understanding of their specific mechanisms remains to be investigated.Herein,we have prepared carbon cloth(CC)frameworks with their surfaces modified using ferromagnetic metal/LiF heterogeneous films(T^(M)-LiF-CC)as the substrate for LMA,which exhibit superior electrochemical performance.Utilizing ferromagnetic Co as a representative example,our study demonstrates that the enhanced performance of Co-LiF-CC,compared to bare CC,is attributed to the spinpolarized interface contributed by the Co/LiF heterostructure.Co and LiF play individual roles in redistributing electrons and Li^(+)to promote homogeneous Li deposition.Co nanoparticles play a crucial role in generating strong surface capacitance by storing electrons in spin-split bands,while LiF,with low surface diffusion barriers,ensures fast transportation of Li^(+).The Co-LiF-CC@Li electrodes deliver long lives of 7400 and 3600 h at 1 and 2 mA·cm^(-2)in symmetric cells,respectively;moreover,they enable full batteries with high and durable capacities,particularly when the N/P ratios are low(3.3 or even 1.7).

关 键 词：Lithium metal anode Interfacial charge Ferromagnetic metal Lithium fluoride Spin polarization 

分 类 号：O646[理学—物理化学]