Electrochemistry of pyrite-based cathodes for ambient temperature lithium batteries

Journal Article · Wed Nov 01 04:00:00 EST 1989 · Journal of the Electrochemical Society; (USA)

DOI:https://doi.org/10.1149/1.2096426· OSTI ID:7227396

Fong, R; Dahn, J R ^[1]; Jones, C H.W. ^[2]

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1. Moli Energy Ltd., Burnaby, BC (Canada)
2. Simon Fraser Univ., Burnaby, BC (Canada). Dept. of Chemistry

The charge and discharge mechanisms of Li/FeS{sub 2} and Li/Li{sub 2} FeS{sub 2} cells near room temperature are studied by in situ x-ray diffraction and in situ {sup 57}Fe Mossbauer spectroscopy. The electrochemical behavior of these cells are compared, and their cell reactions are described, For 0{lt}x{le}0.8, the cycling behavior of Li{sub 2 {minus} x} FeS{sub 2} is reversible. However, for x{gt}0.8, structural decomposition of Li{sub 2 {minus} x} FeS{sub 2} occurs, and disproportionation to nonstoichiometric FeS (FeS{sub y}) and S is observed. Similarly, when Li/FeS{sub 2} cells are recharged to 2.8V, the cathode is a mixture of FeS{sub y} and S. Examination of the mixture by differential scanning calorimetry shows that FeS{sub y} and S react to form FeS{sub 2} above 200{degrees}C. This explains why high temperature Li/FeS{sub 2} cells reversibly while ambient temperature Li/FeS{sub 2} cells show poor reversibility.

• OSTI ID: 7227396
• Journal Information: Journal of the Electrochemical Society; (USA), Journal Name: Journal of the Electrochemical Society; (USA) Vol. 136:11; ISSN JESOA; ISSN 0013-4651
• Country of Publication: United States
• Language: English

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75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALKALI METALS
CATHODES
CHALCOGENIDES
CHEMICAL COMPOSITION
CHEMISTRY
COHERENT SCATTERING
CRYSTAL STRUCTURE
DIFFRACTION
ELECTRIC BATTERIES
ELECTROCHEMICAL CELLS
ELECTROCHEMISTRY
ELECTRODES
ELEMENTS
GAMMA SPECTROMETERS
HIGH TEMPERATURE
IRON COMPOUNDS
IRON SULFIDES
LITHIUM
MATERIALS TESTING
MEASURING INSTRUMENTS
METALS
MICROSTRUCTURE
MINERALS
MOESSBAUER EFFECT
MOESSBAUER SPECTROMETERS
PYRITE
SCATTERING
SPECTROMETERS
SULFIDE MINERALS
SULFIDES
SULFUR COMPOUNDS
TESTING
TRANSITION ELEMENT COMPOUNDS
X-RAY DIFFRACTION