SANDWICH CATHODE LITHIUM BATTERY WITH HIGH ENERGY DENSITY

摘要

A lithium electrochemical cell with increased energy density is described. The electrochemical cell comprises an improved sandwich cathode design with a second cathode active material of a relatively high energy density but of a relatively low rate capability sandwiched between two current collectors and with a first cathode active material having a relatively low energy density but of a relatively high rate capability in contact with the opposite sides of the two current collectors. In addition, a cathode fabrication process is described that increases manufacturing efficiency. The cathode fabrication process comprises a process in which first and second cathode active materials are directly applied to opposite surfaces of a perforated current collector and laminated together. The present cathode design is useful for powering an implantable medical device requiring a high rate discharge application.

主权项

1. An electrochemical cell, comprising:
a) a casing; b) an anode, comprising:
i) an anode current collector;ii) an anode active material comprising lithium in physical contact with the anode current collector; c) a cathode, comprising:
i) a first cathode current collector having a thickness between opposed first and second surfaces;ii) a first cathode active material applied in direct physical contact with the first cathode current collector first surface, wherein the first cathode active material comprises a weight basis that ranges from about 10 mg/cm2 to about 30 mg/cm2;iii) a second cathode active material applied in direct contact with the first cathode current collector second surface; and d) a separator positioned between the anode and cathode within the casing; and e) an electrolyte within the casing activating the anode and cathode.