Electrochemical studies of FeS/sub 2/ electrodes in various sulfide-containing molten salts

Journal Article · Sun Mar 01 04:00:00 EST 1987 · J. Electrochem. Soc.; (United States)

DOI:https://doi.org/10.1149/1.2100504· OSTI ID:6555759

Wang, S S; Seefurth, R N

Cyclic voltammetry and cycling tests were conducted on planar Fe and porous FeS/sub 2/ electrodes in three electrolytes: lithium-rich LiCl-KCl, potassium-rich LiCl-KCl, and potassium-free LiF-LiCl-LiBr. All were saturated with Li/sub 2/S. Electrochemical reactions with high overpotential, which are responsible for the high resistance of Li/FeS/sub 2/ cells, were identified in these electrolytes. It was found that the overpotential of the electrochemical reactions is inversely proportional to the activity of lithium ion in the electrolyte. Therefore, the cell resistance for Li/FeS/sub 2/ cells ought to decrease as the lithium activity increases. The capacity retention of the upper plateau is improved in the K-rich electrolyte. Some iron-containing compounds, electrochemically formed on the iron electrodes in the potassium-free and the potassium-rich electrolytes, were found to be highly soluble in the electrolytes. Iron, formed when these compounds came in contact with the counter-electrode of the cell, caused short circuits. This mechanism may also cause shorting observed during cycling of developmental Li/FeS/sub 2/ cells.

• Research Organization: General Motors Research Labs., Electrochemistry Dept., Warren, MI 48090-9055
• OSTI ID: 6555759
• Journal Information: J. Electrochem. Soc.; (United States), Journal Name: J. Electrochem. Soc.; (United States) Vol. 134:3; ISSN JESOA
• Country of Publication: United States
• Language: English

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