Direct Visualization of the Solid Electrolyte Interphase and Its Effects on Silicon Electrochemical Performance

Mahsa Sina, Judith Alvarado, Hitoshi Shobukawa, Caleb Alexander, Viacheslav Manichev, Leonard C Feldman, Torgny Gustafsson, Keith J. Stevenson, Ying Shirley Meng

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

Fluoroethylene carbonate (FEC) as an electrolyte additive can considerably improve the cycling performance of silicon (Si) electrodes in Li-ion batteries. However, the fundamental mechanism for how FEC contributes to solid electrolyte interphase (SEI) morphological changes and chemical composition is not well understood. Here, scanning transmission electron microscopy coupled with electron energy loss spectroscopy gives a comprehensive insight as to how FEC affects the SEI evolution in terms of composition and morphology throughout electrochemical cycling. In the first lithiation cycle, the electrode cycled in ethylene carbonate (EC): diethylene carbonate (DEC) forms a porous uneven SEI composed of mostly Li2CO3. However, the electrode cycled in EC/DEC/FEC is covered in a dense and uniform SEI containing mostly LiF. Interestingly, the intrinsic oxide layer (Li x SiO y) is not observed at the interface of electrode cycled in EC/DEC/FEC after 1 cycle. This is consistent with fluoride anion formation from the reduction of FEC, which leads to the chemical attack of any silicon-oxide surface passivation layer. Furthermore, surface sensitive helium ion microscopy and X-ray photoelectron spectroscopy techniques give further insights to the SEI composition and morphology in both electrodes cycled with different electrolytes.

Original languageEnglish
Article number1600438
JournalAdvanced Materials Interfaces
Volume3
Issue number20
DOIs
Publication statusPublished - Oct 19 2016

Fingerprint

Solid electrolytes
Carbonates
Visualization
Silicon
Electrodes
Ethylene
Chemical analysis
Electrolytes
Chemical attack
Electron energy loss spectroscopy
Silicon oxides
Passivation
Helium
Microscopic examination
Negative ions
X ray photoelectron spectroscopy
Transmission electron microscopy

Keywords

  • electron energy loss spectroscopy
  • fluoroethylene carbonate
  • scanning transmission electron microscopy
  • solid electrolyte interphases

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering

Cite this

Direct Visualization of the Solid Electrolyte Interphase and Its Effects on Silicon Electrochemical Performance. / Sina, Mahsa; Alvarado, Judith; Shobukawa, Hitoshi; Alexander, Caleb; Manichev, Viacheslav; Feldman, Leonard C; Gustafsson, Torgny; Stevenson, Keith J.; Meng, Ying Shirley.

In: Advanced Materials Interfaces, Vol. 3, No. 20, 1600438, 19.10.2016.

Research output: Contribution to journalArticle

Sina, M, Alvarado, J, Shobukawa, H, Alexander, C, Manichev, V, Feldman, LC, Gustafsson, T, Stevenson, KJ & Meng, YS 2016, 'Direct Visualization of the Solid Electrolyte Interphase and Its Effects on Silicon Electrochemical Performance', Advanced Materials Interfaces, vol. 3, no. 20, 1600438. https://doi.org/10.1002/admi.201600438
Sina, Mahsa ; Alvarado, Judith ; Shobukawa, Hitoshi ; Alexander, Caleb ; Manichev, Viacheslav ; Feldman, Leonard C ; Gustafsson, Torgny ; Stevenson, Keith J. ; Meng, Ying Shirley. / Direct Visualization of the Solid Electrolyte Interphase and Its Effects on Silicon Electrochemical Performance. In: Advanced Materials Interfaces. 2016 ; Vol. 3, No. 20.
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