ALD Protection of Li-Metal Anode Surfaces – Quantifying and Preventing Chemical and Electrochemical Corrosion in Organic Solvent

Chuan Fu Lin*, Alexander C. Kozen, Malachi Noked, Chanyuan Liu, Gary W. Rubloff

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

34 Scopus citations

Abstract

Chemical and electrochemical instability of the Li metal interface with organic solvent has been a major impediment to use of Li-metal anodes for next-generation batteries. Here the character of Li surface degradation and the application of atomic layer deposition (ALD) as a protection layer to suppress the degradation are addressed. Using standard Li foil samples in organic solvent with and without in situ deposited ALD Al2O3 protective layers, results from in situ atomic force microscopy, mass spectrometry (including differential electrochemical mass spectrometry), X-ray Photoelectron Spectroscopy (XPS), and ex situ scanning electron microscopy/energy dispersive X-ray spectroscopy are reported. Despite the presence of a thin oxide/hydroxide/carbonate layer on the Li foil surface, degradation readily occurs in organic solvent, particularly at surface features such as ridges. Introduction of the ALD protective layer – deposited directly on this Li foil surface – dramatically suppresses the degradation.

Original languageEnglish
Article number1600426
JournalAdvanced Materials Interfaces
Volume3
Issue number21
DOIs
StatePublished - 7 Nov 2016
Externally publishedYes

Keywords

  • atomic force microscopy
  • atomic layer deposition (ALD)
  • differential electrochemical mass spectrometry (DEMS)
  • Li-metal anodes
  • solid electrolyte interphase (SEI)
  • solvent decomposition

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