Mixed ionic electronic conductor coatings for redox electrodes
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United States of America Patent
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Apr 3, 2001
Grant Date -
N/A
app pub date -
Sep 1, 1998
filing date -
Sep 1, 1998
priority date (Note) -
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Abstract
Disclosed is a redox electrode for a battery cell that has a coating to mitigate plugging by precipitated discharge products. The coating comprises a mixed ionic electronic conductor (MIEC) which is applied to the surface of a redox electrode. The presence of the MIEC coating allows for rapid removal of discharge product precipitates from redox electrodes since it is capable of conducting both electrons and ions. As a result, the chemical action necessary to remove such precipitates may take place on both the electrolyte side of the precipitate and at the precipitate/electrode interface. MIEC coatings in accordance with the present invention may be composed of any suitable material having ionic conductivity for a metal ion in a negative electrode with which the redox electrode is to be paired in a battery cell, and reversible redox capacity. Examples include titanium sulfide (TiS.sub.2), iron sulfide (FeS.sub.2), and cobalt oxides.
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