Double current collector negative electrode design for...

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H - Electricity

01

M

H01M 4/02 (2006.01) H01M 4/06 (2006.01) H01M 4/08 (2006.01) H01M 4/34 (2006.01) H01M 4/40 (2006.01) H01M 6/16 (2006.01) H01M 6/50 (2006.01) H01M 4/36 (2006.01) H01M 4/66 (2006.01) H01M 10/40 (2006.01) H01M 4/48 (2006.01) H01M 4/58 (2006.01)

Patent

CA 2363162

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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