中国物理B ›› 2020, Vol. 29 ›› Issue (4): 48203-048203.doi: 10.1088/1674-1056/ab7b54

所属专题: SPECIAL TOPIC — Advanced calculation & characterization of energy storage materials & devices at multiple scale

• SPECIAL TOPIC—Recent advances in thermoelectric materials and devices • 上一篇    下一篇

Influence of fluoroethylene carbonate on the solid electrolyte interphase of silicon anode for Li-ion batteries: A scanning force spectroscopy study

Jieyun Zheng(郑杰允), Jialiang Liu(刘家亮), Suijun Wang(王绥军), Fei Luo(罗飞), Liubin Ben(贲留斌), Hong Li(李泓)   

  1. Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, China, State Key Laboratory of Operation and Control of Renewable Energy, Storage Systems, China Electric Power Research Institute, Beijing, China
  • 收稿日期:2019-12-30 修回日期:2020-02-26 出版日期:2020-04-05 发布日期:2020-04-05
  • 通讯作者: Hong Li E-mail:hli@iphy.ac.cn
  • 基金资助:
    Project supported by the State Grid Technology Project, China (Grant No. DG71-17-010).

Influence of fluoroethylene carbonate on the solid electrolyte interphase of silicon anode for Li-ion batteries: A scanning force spectroscopy study

Jieyun Zheng(郑杰允)1, Jialiang Liu(刘家亮)2, Suijun Wang(王绥军)2, Fei Luo(罗飞)1, Liubin Ben(贲留斌)1, Hong Li(李泓)1   

  1. Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, China, State Key Laboratory of Operation and Control of Renewable Energy, Storage Systems, China Electric Power Research Institute, Beijing, China
  • Received:2019-12-30 Revised:2020-02-26 Online:2020-04-05 Published:2020-04-05
  • Contact: Hong Li E-mail:hli@iphy.ac.cn
  • Supported by:
    Project supported by the State Grid Technology Project, China (Grant No. DG71-17-010).

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.

关键词: Si, fluoroethylene carbonate, solid electrolyte interphase, atomic force microscopy force spectroscopy

Abstract: 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.

Key words: Si, fluoroethylene carbonate, solid electrolyte interphase, atomic force microscopy force spectroscopy

中图分类号:  (Lithium-ion batteries)

  • 82.47.Aa
82.45.Fk (Electrodes) 79.60.Jv (Interfaces; heterostructures; nanostructures) 68.37.Ps (Atomic force microscopy (AFM))