Converting an O-vacancy-rich oxide into a multifunctional separator modifier for long-lifespan lithium metal batteries  

作　　者：Juntao Si Xiaoying Li Yixuan Li Kuo Cao Yiran Zhu Chunhua Chen 

机构地区：[1]CAS Key Laboratory of Precision and Intelligent Chemistry,Department of Materials Science and Engineering,University of Science and Technology of China,Hefei 230026,Anhui,China

出　　处：《Journal of Energy Chemistry》2024年第10期371-378,I0007,共9页能源化学（英文版）

基　　金：supported by the National Nature Science Foundation of China [52172247, 21875237];the National Key R&D Program of China [2018YFB0905400]。

摘　　要：The lithium metal anode is hailed as the desired "holy grail" for the forthcoming generation of highenergy-density batteries,given its astounding theoretical capacity and low potential.Nonetheless,the formation and growth of dendrites seriously compromise battery life and safety.Herein,an yttriastabilized bismuth oxide(YSB) layer is fabricated on the polypropylene(PP) separator,where YSB reacts with Li anode in-situ in the cell to form a multi-component composite interlayer consisting of Li_(3)Bi,Li_(2)O,and Y_(2)O_(3).The interlayer can function not only as a redistributor to regulate Li^(+) distribution but also as an anion adsorber to increase the Li^(+) transference number from 0.37 to 0.79 for suppressing dendrite nucleation and growth.Consequently,compared with the cell with a baseline separator,those with modified separators exhibit prolonged lifespan in both Li/Li symmetrical cells and Li/Cu half-cells.Notably,the full cells coupled with ultrahigh-loading LiFePO_(4) display an excellent cycling performance of 1700 cycles with a high capacity retention of ~80% at 1 C,exhibiting great potential for practical applications.This work provides a feasible and effective new strategy for separator modification towards building a much-anticipated dendrite-free Li anode and realizing long-lifespan lithium metal batteries.

关 键 词：Lithium metal battery SEPARATOR Dendrite-free Multifunctional interlayer Conversion-alloying reaction 

分 类 号：TM912[电气工程—电力电子与电力传动] TB383.2[一般工业技术—材料科学与工程]