Epitaxial Growth of Nanostructured Li2Se on Lithium Metal for All Solid‐State Batteries

Advanced Science

Dongsoo Lee¹  Jaeik Kim¹  Joonhyeok Park¹  Seonghan Jo¹  Jeongheon Kim¹  Taeseup Song¹  Ungyu Paik¹  Hyunjung Park² 

[1] Department of Energy Engineering Hanyang University Seoul 133‐791 Korea;Department of Materials Science and Engineering Chosun University Gwangju 61452 Korea;

关键词: all solid‐state batteries;    lithium metal;    lithium selenide;    protective layer;    sulfide‐based electrolyte;   

DOI  :  10.1002/advs.202004204

来源: DOAJ

【 摘 要 】

Abstract Lithium is considered to be the ultimate anode material for high energy‐density rechargeable batteries. Recent emerging technologies of all solid‐state batteries based on sulfide‐based electrolytes raise hope for the practical use of lithium, as it is likely to suppress lithium dendrite growth. However, such devices suffer from undesirable side reactions and a degradation of electrochemical performance. In this work, nanostructured Li2Se epitaxially grown on Li metal by chemical vapor deposition are investigated as a protective layer. By adjusting reaction time and cooling rate, a morphology of as‐prepared Li2Se is controlled, resulting in nanoparticles, nanorods, or nanowalls with a dominant (220) plane parallel to the (110) plane of the Li metal substrate. Uniaxial pressing the layers under a pressure of 50 MPa for a cell preparation transforms more compact and denser. Dual compatibility of the Li2Se layers with strong chemical bonds to Li metal and uniform physical contact to a Li6PS5Csulfide electrolyte prevents undesirable side reactions and enables a homogeneous charge transfer at the interface upon cycling. As a result, a full cell coupled with a LiCoO2‐based cathode shows significantly enhanced electrochemical performance and demonstrates the practical use of Li anodes with Li2Se layers for all solid‐state battery applications.

【 授权许可】

Unknown