articleJournal of the American Chemical SocietyNov 28, 2012Closed access

The Carbon Electrode in Nonaqueous Li–O 2 Cells

MMMuhammed M. Ottakam ThotiylSAStefan A. FreunbergerZPZhangquan PengPGPeter G. Bruce

University of St Andrews

PubMed
Indexed incrossrefpubmed

Abstract

Carbon has been used widely as the basis of porous cathodes for nonaqueous Li-O(2) cells. However, the stability of carbon and the effect of carbon on electrolyte decomposition in such cells are complex and depend on the hydrophobicity/hydrophilicity of the carbon surface. Analyzing carbon cathodes, cycled in Li-O(2) cells between 2 and 4 V, using acid treatment and Fenton's reagent, and combined with differential electrochemical mass spectrometry and FTIR, demonstrates the following: Carbon is relatively stable below 3.5 V (vs Li/Li(+)) on discharge or charge, especially so for hydrophobic carbon, but is unstable on charging above 3.5 V (in the presence of Li(2)O(2)), oxidatively decomposing to form…

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Topics & keywords

Topics
Keywords
  • Chemistry
  • Electrolyte
  • Carbon fibers
  • Decomposition
  • Inorganic chemistry
  • Electrochemistry
  • Glassy carbon
  • Cathode
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