涂层
材料科学
阳极
三元运算
离子
相(物质)
硅
锂(药物)
电解质
电极
化学工程
纳米技术
冶金
化学
工程类
医学
内分泌学
物理化学
有机化学
程序设计语言
计算机科学
作者
Zhifei Li,Caleb Stetson,Glenn Teeter,Andrew G. Norman,Yeyoung Ha,Bertrand J. Tremolet de Villers,Zoey Huey,Patrick Walker,Sang‐Don Han,Steven C. DeCaluwe,Chun‐Sheng Jiang,Anthony K. Burrell,Andriy Zakutayev
出处
期刊:ACS applied energy materials
[American Chemical Society]
日期:2020-11-24
卷期号:3 (12): 11534-11539
被引量:12
标识
DOI:10.1021/acsaem.0c02298
摘要
Silicon (Si) is a promising anode material for high-energy-density lithium-ion batteries (LIBs), but its short calendar life and poor cycling performance prevent its large-scale adoption. Introducing magnesium (Mg) salt into the electrolyte has been recently shown to form a ternary Li–Mg–Si Zintl phase upon lithiation of Si and improve the cycling performance. However, the ternary Zintl phase formation mechanism and its impact on the solid electrolyte interphase (SEI) are not yet well understood. Here, we demonstrate the formation of a ternary Li–Mg–Si Zintl phase by Mg coating of the Si anode, where Mg diffuses into the Si film upon deposition and intermixes further during the lithiation process. The presence of the Zintl phase improves the interface stability, alters the nature of the SEI, and enhances the cycling performance of the Si anode. This study provides insights into the formation mechanism of the ternary Zintl phase and guidelines for the future design of Si anodes.
科研通智能强力驱动
Strongly Powered by AbleSci AI