Rechargeable spinel lithium batteries with greatly improved elevated temperature cycle life
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United States of America Patent
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Dec 3, 2002
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N/A
app pub date -
Jan 14, 2000
filing date -
May 26, 1999
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Abstract
The loss in delivered capacity (capacity fade) after cycling non-aqueous rechargeable lithium manganese oxide batteries at elevated temperatures can be greatly reduced by depositing a small amount of certain foreign metal species on the surface of spinel in the cathode. In particular the foreign metal species are from compounds having either bismuth, lead, lanthanum, barium, zirconium, yttrium, strontium, zinc or magnesium. The foreign metal species are introduced to the surface of spinel by moderately heating either an aqueous treated mixture or a dry mixture of ready-made spinel and the foreign metal compound.
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