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Medical device having lithium-ion battery

  • US 7,879,495 B2
  • Filed: 10/29/2004
  • Issued: 02/01/2011
  • Est. Priority Date: 10/29/2004
  • Status: Active Grant
First Claim
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1. A medical device comprising:

  • a rechargeable lithium-ion battery for providing power to the medical device, the lithium-ion battery comprising;

    a positive electrode comprising a current collector and a first active material; and

    a negative electrode comprising a current collector, a first layer comprising a second active material, and a second layer separate and different from the first layer comprising a third active material, the second active material comprising a lithium titanate material and the third active material selected from the group consisting of LiMn2O4, LixVO2 where x is between approximately 0 and 1, LiMxMn(2-x)O4 (where M is a metal and x is between approximately 0.05 and 0.4), V6O13, V2O5, V3O8, MoO3, TiS2, WO2, MoO2, RuO2, and combinations thereof;

    wherein the third active material exhibits charging and discharging capacity below a corrosion potential of the current collector of the negative electrode and above a decomposition potential of the first active material.

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