材料科学
电解质
阳极
相间
扫描电子显微镜
化学工程
碳酸盐
光谱学
碳酸乙烯酯
离子
硅
纳米技术
电极
电化学
复合材料
光电子学
化学
物理化学
冶金
有机化学
遗传学
工程类
物理
生物
量子力学
作者
Jieyun Zheng,Jialiang Liu,Suijun Wang,Fei Luo,Liubin Ben,Hong Li
出处
期刊:Chinese Physics B
[IOP Publishing]
日期:2020-03-01
卷期号:29 (4): 048203-048203
被引量:8
标识
DOI:10.1088/1674-1056/ab7b54
摘要
Silicon is an important high capacity anode material for the next generation Li-ion batteries. The electrochemical performances of the Si anode are influenced strongly by the properties of the solid electrolyte interphase (SEI). It is well known that the addition of flouroethylene carbonate (FEC) in the carbonate electrolyte is helpful to improve the cyclic performance of the Si anode. The possible origin is suggested to relate to the modification of the SEI. However, detailed information is still absent. In this work, the structural and mechanical properties of the SEI on Si thin film anode in the ethylene-carbonate-based (EC-based) and FEC-based electrolytes at different discharging and charging states have been investigated using a scanning atomic force microscopy force spectroscopy (AFMFS) method. Single-layered, double-layered, and multi-layered SEI structures with various Young’s moduli have been visualized three dimensionally at nanoscale based on the hundreds of force curves in certain scanned area. The coverage of the SEI can be obtained quantitatively from the two-dimensional (2D) project plots. The related analysis indicates that more soft SEI layers are covered on the Si anode, and this could explain the benefits of the FEC additive.
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