Patents Represented by Attorney, Agent or Law Firm Michael F. Saclise
  • Patent number: 6737191
    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.
    Type: Grant
    Filed: November 8, 2001
    Date of Patent: May 18, 2004
    Assignee: Wilson Greatbatch Ltd.
    Inventors: Hong Gan, Robert S. Rubino, Esther S. Takeuchi