Patent ID: 7682745

Claim:
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 an active material comprising a material selected from the group consisting of LiCoO 2 , LiMn 2 O 4 , LiNi 1/3 Co 1/3 Mn 1/3 O 2 , LiAl x Co y Ni (1−x−y) O 2 where x is between approximately 0.05 and 0.3 and y is between approximately 0.1 and 0.3, LiTi x Co y Ni (1−x−y) O 2 where x is between approximately 0.05 and 0.3 and y is between approximately 0.1 and 0.3, and combinations thereof; a negative electrode comprising a foil current collector and an active material comprising a lithium titanate material, the current collector of the negative electrode comprising a material selected from the group consisting of aluminum, titanium, and combinations thereof; a liquid electrolyte; and a polymeric separator provided intermediate the positive electrode and the negative electrode that includes pores for allowing the liquid electrolyte to flow through the separator; whereby the battery is configured for cycling to near-zero-voltage conditions without a substantial loss of battery capacity.