Overcharge and overdischarge protection of ambient temperature secondary lithium cells
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United States of America Patent
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Jan 11, 1994
Grant Date -
N/A
app pub date -
Sep 2, 1992
filing date -
Sep 2, 1992
priority date (Note) -
Expired
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Abstract
A cathode additive is provided for protecting an ambient temperature secondary lithium cell from over-charging or over-discharging. The cathode additive is chosen to create an upper voltage plateau which is slightly higher than a characteristic charge cutoff voltage of the cathode of the cell. The cathode additive additionally creates a lower voltage plateau which is slightly lower than the characteristic discharge cutoff voltage of the cell. Preferably the cathode additive is a transition metal oxide or a sulfide may, for example, include a mixture of Li.sub.2 Mn.sub.2 O.sub.4 and Li.sub.0.1 MoO.sub.2.
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