Morphological transitions on lithium metal anodes

Carmen M. López, John T. Vaughey, Dennis W. Dees

Research output: Contribution to journalArticle

87 Citations (Scopus)

Abstract

Coin cells were prepared using a metallic lithium anode, a Li4 Ti5 O12 cathode, and a 1.2 M LiPF6 /ethylene carbonate:ethyl methyl carbonate (30:70 wt %) electrolyte. The cells were cycled galvanostatically between 1 and 2 V vs Li/ Li+ (i=2.0 mA/ cm 2) at a 2C rate. After a specific number of cycles, the cells were disassembled and the morphology of the lithium anode was characterized using scanning electron microscopy. It was observed that the surface morphology of the lithium metal electrode transitioned from a flat and smooth morphology to a microscopically rugged structure that shows three distinct layers: a top dendritic layer, an intermediate porous layer, and a residual metallic lithium layer. Morphological and electrochemical evidence points to the depletion of the electrolyte and the active metallic lithium that reacted to produce the porous layer as the most likely cause of cell failure under the conditions studied.

Original languageEnglish
JournalJournal of the Electrochemical Society
Volume156
Issue number9
DOIs
Publication statusPublished - 2009
Externally publishedYes

Fingerprint

Lithium
Anodes
anodes
lithium
Metals
metals
cells
Electrolytes
Carbonates
carbonates
electrolytes
Surface morphology
Ethylene
depletion
Cathodes
ethylene
cathodes
Scanning electron microscopy
cycles
Electrodes

ASJC Scopus subject areas

  • Electrochemistry
  • Renewable Energy, Sustainability and the Environment
  • Electronic, Optical and Magnetic Materials
  • Materials Chemistry
  • Surfaces, Coatings and Films
  • Condensed Matter Physics

Cite this

Morphological transitions on lithium metal anodes. / López, Carmen M.; Vaughey, John T.; Dees, Dennis W.

In: Journal of the Electrochemical Society, Vol. 156, No. 9, 2009.

Research output: Contribution to journalArticle

López, Carmen M. ; Vaughey, John T. ; Dees, Dennis W. / Morphological transitions on lithium metal anodes. In: Journal of the Electrochemical Society. 2009 ; Vol. 156, No. 9.
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