Double current collector negative electrode design for alkali metal ion electrochemical cells
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United States of America Patent
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May 18, 2004
Grant Date -
May 23, 2002
app pub date -
Nov 8, 2001
filing date -
Nov 17, 2000
priority date (Note) -
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Abstract
A new sandwich negative electrode design for a secondary cell is provided comprising a 'sacrificial' alkali metal along with a carbonaceous anode material. In the case of a hard carbon anode material, the sacrificial alkali metal is preferably lithium and is sized to compensate for the initial irreversible capacity of this anode material. Upon activating the cells, the lithium metal automatically intercalates into the hard carbon anode material. That way, the sacrificial lithium is consumed and compensates for the generally unacceptable irreversible capacity of hard carbon. The superior cycling longevity of hard carbon now provides a secondary cell of extended use beyond that know for conventional secondary cells having only graphitic anode materials.
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