Constructing a fluorinated interface layer enriched with Ge nanoparticles and Li-Ge alloy for stable lithium metal anodes  

作　　者：Fulu Chu Jinwei Zhou Jiamin Liu Fengcheng Tang Liubin Song Feixiang Wu 

机构地区：[1]School of Metallurgy and Environment,Engineering Research Center of the Ministry of Education for Advanced Battery Materials,Hunan Provincial Key Laboratory of Nonferrous Value-added Metallurgy,Central South University,Changsha 410083,China [2]Hunan Provincial Key Laboratory of Materials Protection for Electric Power and Transportation,School of Chemistry and Chemical Engineering,Changsha University of Science and Technology,Changsha 410004,China [3]School of Materials Science&Engineering,University of Jinan,Jinan 250022,China

出　　处：《Nano Research》2024年第6期5148-5158,共11页纳米研究（英文版）

基　　金：the National Natural Science Foundation of China(Nos.51904344 and 52172264);the Natural Science Foundation of Hunan Province of China(Nos.2021JJ10060 and 2022GK2033).

摘　　要：Lithium metal batteries(LMBs)based on metallic Li exhibit high energy density to be competent for advanced energy storage applications.However,the unstable solid electrolyte interphase(SEI)layer due to continuous decomposition of electrolytes,and the attendant problem of Li dendrite growth frustrate their commercialization process.Herein,a hybrid SEI comprising abundant LiF,lithiophilic Li-Ge alloy,and Ge nanoparticles is constructed via a simple brush coating method.This fluorinated interface layer with embedded Ge-containing components isolates the Li anode from the corrosive electrolyte and facilitates homogenous Li nucleation as well as uniform growth.Consequently,the modified Li anode exhibits remarkable stability without notorious Li dendrites,delivering stable cycling lives of more than 1000 h for symmetric Li||Li cells and over 600 cycles for Li||Cu cells at 1 mA·cm^(−2).Moreover,the reinforced Li anodes endow multiple full-cell architectures with dramatically improved cyclability under different test conditions.This work provides rational guidance to design an artificial hybrid SEI layer and would stimulate more ideas to solve the dendrite issue and promote the further development of advanced LMBs.

关 键 词：lithium metal anode artificial solid electrolyte interphase(SEI) dendrite suppression lithium fluoride Li-Ge alloy 

分 类 号：TM912[电气工程—电力电子与电力传动] TB383[一般工业技术—材料科学与工程]