Double current collector positive electrode for alkali metal ion electrochemical cells
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United States of America Patent
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May 30, 2006
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N/A
app pub date -
Dec 4, 2002
filing date -
Dec 5, 2001
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Abstract
A new sandwich positive electrode design for a secondary cell is provided comprising a 'sacrificial' alkali metal along with a cathode active material. In the case of silver vanadium oxide, the sacrificial alkali metal is preferably lithium. Upon activating the cells, the lithium metal automatically intercalates into the silver vanadium oxide. That way, the sacrificial lithium is consumed and essentially lithiates the silver vanadium oxide. This means that cathode active materials, such as silver vanadium oxide, which before now were generally only used in primary cells, are now useful in secondary cells. In some use applications, silver vanadium oxide is more desirable than typically used lithiated cathode active materials.
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