Boosting fast interfacial Li^(+)transport in solid-state Li metal batteries via ultrathin Al buffer layer  

作　　者：Shengnan Zhang Qing Sun Guangmei Hou Jun Cheng Linna Dai Jianwei Li Lijie Ci 

机构地区：[1]Key Laboratory for Liquid-Solid Structural Evolution&Processing of Materials(Ministry of Education),Research Center for Carbon Nanomaterials,School of Materials Science and Engineering,Shandong University,Jinan 250061,China [2]School of Light Industry and Engineering,Qilu University of Technology(Shandong Academy of Sciences),Jinan 250353,China [3]State Key Lab of Advanced Welding and Joining,School of Materials Science and Engineering,Harbin Institute of Technology(Shenzhen),Shenzhen 518055,China [4]School of Science,Hubei University of Technology,Wuhan 430068,China [5]University of Health and Rehabilitation Sciences,Qingdao266071,China

出　　处：《Nano Research》2023年第5期6825-6832,共8页纳米研究（英文版）

基　　金：High-level Talents’Discipline Construction Fund of Shandong University(No.31370089963078);School Research Startup Expenses of Harbin Institute of Technology(Shenzhen)(No.DD29100027).

摘　　要：Na superionic conductor(NASICON)-type Li_(1.5)Al_(0.5)Ge_(0.5)P_(3)O_(12)(LAGP)solid state electrolytes(SSEs)have attracted significant interests thanks to the prominent ionic conductivity(>10^(–4)S·cm^(–1))at room temperature and superb stability in air.Unfortunately,its application has been hindered by the lithium dendrites and the intrinsic interfacial instability of LAGP towards metallic Li,etc.Herein,by magnetron sputtering(MS),an ultrathin Al film is deposited on the surface of the LAGP pellet(Al-LAGP).By in-situ alloying reaction,the spontaneously formed LiAl buffer layer inhibits the side reaction between LAGP SSEs and Li metal,induces the uniform distribution of interfacial electric field as well.Density functional theory(DFT)calculations demonstrate that the LiAl alloy surface promotes the diffusion of lithium atoms due to the lower energy barrier,thereby inhibiting the formation of lithium dendrites.Consequently,the Li/Al-LAGP-Al/Li symmetric cells show a low resistance of 210Ωand a durable lifespan over 1,200 h at a high current density of 0.1 mA·cm^(-2).Assembled all solid state lithium metal batteries(ASSLMBs)with LiFePO_(4)(LFP)cathode significantly improve cycle stability and rate performance,proving a promising stabilization strategy towards the NASIOCN type electrolyte/anode interface in solid state Li metal batteries.

关 键 词：Li_(1.5)Al_(0.5)Ge_(0.5)P_(3)O_(12) solid-state battery Li+transport interfacial modification Al buffer 

分 类 号：TM912[电气工程—电力电子与电力传动]