Patent ID: 6645670
Filing Date: 2003-11-11
Classification: A61N,H01M,Y02E,Y02P,Y10T

Abstract:
An electrochemical cell, which comprises:a) a first cathode structure of a first cathode active material of a first energy density and a first rate capability sandwiched between first and second cathode current collectors, and a second cathode active material of a second energy density and a second rate capability contacted to the first and second cathode current collectors opposite the first cathode active material, wherein the first energy density of the first cathode active material is greater than the second energy density while the first rate capability is less than the second rate capability of the second cathode active material; b) a first anode structure of an alkali metal contacted to opposite sides of a first anode current collector, wherein the first anode structure is in electrical association with the second cathode active material contacting the first cathode current collector; c) a second cathode structure having a third cathode active material of a third energy density and a third rate capability contacted to one side of a third cathode current collector, and a fourth cathode active material of a fourth energy density and a fourth rate capability contacted to the other side of the third cathode current collector, wherein the third energy density of the third cathode active material is greater than the fourth energy density while the third rate capability is less than the fourth rate capability of the fourth cathode active material and wherein the fourth cathode active material is in electrical association with the first anode structure opposite the second cathode active material contacting the first cathode current collector; and d) a nonaqueous electrolyte activating the first anode structure and the first and second cathode structures.