Dual chemistry electrode design

An electrochemical cell, which comprises:

• a) an anode comprising lithium;
• b) a cathode of silver vanadium oxide contacted to outer major sides of a first and second cathode current collectors and fluorinated carbon contacted to inner major sides of the first and second cathode current collectors, wherein the silver vanadium oxide contacted to the first cathode current collector has a first periphery, the silver vanadium oxide contacted to the second cathode current collector has a second periphery and the fluorinated carbon contacted to the first and second cathode current collectors has a third periphery greater than each of the first and second peripheries;
• and
• c) a nonaqueous electrolyte activating the anode and the cathode.

A method powering an implantable medical device, comprising the steps of:

• a) providing the medical device;
• b) providing an electrochemical cell comprising the steps of:
• i) providing an anode of an alkali metal;
• ii) providing a cathode of a first cathode active material having a relatively low energy density but a relatively high rate capability contacted to outer major sides of a first and a second cathode current collectors and a second cathode active material having a relatively high energy density but a relatively low rate capability contacted to inner major sides of the first and second cathode current collectors;
• iii) including providing the first cathode active material contacted to the first cathode current collector having a first periphery, the first cathode active material contacted to the second cathode current having a second periphery and the second cathode active material contacted to the first and second cathode current collectors having a third periphery greater than each of the first and second peripheries;
• iv) activating the anode and cathode with a nonaqueous electrolyte;
• and
• c) electrically connecting the electrochemical cell to the medical device.