A QUARTZ CRYSTAL MICROBALANCE STUDY OF LITHIUM INSERTION AND REMOVAL INTO EVAPORATED FILMS MOy (M = Mo, Fe AND V)

Authors
  1. Andrukaitis, E.
  2. McMillan, R.S.
Corporate Authors
Chief of Research and Development, Ottawa ONT (CAN) Director Research and Development Air;National Research Council of Canada, Ottawa ONT (CAN) Inst for Environmental Chemistry
Abstract
The reversible Li insertion in WO3 containing MoO3, V2O5 and Fe2O3 evaporated films was examined using the electrochemical quartz crystal microbalance (EQCM) technique. Amorphous films in their highest oxidation state were thermally evaporated onto 5 MHz A.T. cut quartz crystals. The frequency (mass) change for Li intercalation followed the 1 e transfer reaction given by: xLi+ + xe + MOy = LixMOy, where M = Mo, Fe, V and/or W. Initial insertion/removal cycles have a low utilization of the electrode surface, with the reversibility of the lithium intercalation dependant on stoichiometry. The lithium was found to accumulate in the film by the EQCM technique during the electrochemical reduction and oxidation of these films. Surface changes such as film dissolution and electrolyte decomposition were detected by the EQCM technique during constant current cycling.
Date of publication
01 Dec 1992
Number of Pages
11
DSTKIM No
93-00649
CANDIS No
127897
Format(s):
Hardcopy;Originator's fiche received by DSIS

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