Tuning the electron transport behavior at Li/LATP interface for enhanced cyclability of solid-state Li batteries
作者机构：Department of PhysicsCollaborative Innovation Center for Optoelectronic Semiconductors and Efficient DevicesKey Laboratory of Low Dimensional Condensed Matter Physics(Department of Education of Fujian Province)Jiujiang Research InstituteXiamen UniversityXiamen 361005China State Key Lab of Physical Chemistry of Solid SurfacesCollege of MaterialsXiamen UniversityXiamen 361005China College of Materials Science and EngineeringNanjing Forestry UniversityNanjing 210037China Western Digital Corporation951 Sandisk DrMilpitasCA 95035USA
出 版 物：《Nano Research》 (纳米研究（英文版）)
年 卷 期：2023年第16卷第1期
页 面：1634-1641页
核心收录：
基 金：This research was supported by the National Natural Science Foundation of China(Nos.52072323,52172240,and 11874307) Natural Science Foundation of Jiangxi Province(No.20192ACBL20048) Natural Science Foundation of Jiangsu Province(No.BK20200800) Scientific Research Project of Fujian Provincial Department of Education(No.JAT191150) the Fundamental Research Funds for the Central Universities(No.20720200075) the Double-First Class Foundation of Materials and Intelligent Manufacturing Discipline of Xiamen University
主 题：solid-state electrolyte Li metal LiF Al electron transport interfacial barrier
摘 要：An interlayer is usually employed to tackle the interfacial instability issue between solid electrolytes(SEs)and Li metal caused by the side ***,the failure mechanism of the ionic conductor interlayers,especially the influence from electron penetration,remains largely ***,using Li1.3Al0.3Ti1.7(PO4)3(LATP)as the model SE and LiF as the interlayer,we use metal semiconductor contact barrier theory to reveal the failure origin of Li/LiF@LATP interface based on the calculation results of density functional theory(DFT),in which electrons can easily tunnel through the LiF grain boundary with F vacancies due to its narrow barrier width against electron injection,followed by the reduction of ***,an Al-LiF bilayer between Li/LATP is found to dramatically promote the interfacial stability,due to the highly increased barrier width and homogenized electric field at the ***,the Li symmetric cells with Al-LiF bilayer can exhibit excellent cyclability of more than 2,000 h superior to that interlayered by LiF monolayer(~860 h).Moreover,the Li/Al-LiF@LATP/LiFePO4 solid-state batteries deliver a capacity retention of 83.2%after 350 cycles at 0.5 *** findings emphasize the importance of tuning the electron transport behavior by optimizing the potential barrier for the interface design in high-performance solid-state batteries.
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