Nonaqueous electrochemical cell with improved energy density
First Claim
1. An electrochemical cell comprising a cathode assembly, said cathode assembly comprising a metallic cathode current collector having two major surfaces and a cathode coating disposed on at least one of said two major surfaces, said coating comprising iron disulfide, said cell further comprising a metallic lithium anode alloyed with aluminum, wherein the anode to cathode input ratio is less than or equal to 1.0.
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Abstract
This invention relates to a nonaqueous cell comprising a lithium metallic foil anode and a cathode coating comprising iron disulfide as the active material wherein the coating is applied to at least one surface of a metallic substrate that functions as the cathode current collector. In particular, the cell of the within invention has improved performance on high rate discharge and is achieved, surprisingly, with an anode underbalance. The cell of the within invention has an anode to cathode input that is less than or equal to 1.0. We have discovered, unexpectedly, that the energy density for the cell both volumetrically and gravametrically can be improved by approximately 20 to 25% while only increasing the volume of the cathode coating solids by approximately 10% through a unique and novel cathode coating formulation used in conjunction with an alloyed lithium foil.
71 Citations
23 Claims
- 1. An electrochemical cell comprising a cathode assembly, said cathode assembly comprising a metallic cathode current collector having two major surfaces and a cathode coating disposed on at least one of said two major surfaces, said coating comprising iron disulfide, said cell further comprising a metallic lithium anode alloyed with aluminum, wherein the anode to cathode input ratio is less than or equal to 1.0.
- 14. An electrochemical cell comprising a cathode assembly, said cathode assembly comprising a metallic cathode current collector having two major surfaces and a cathode coating disposed on at least one of said two major surfaces, said cathode coating comprising iron disulfide or pyrite, acetylene black and synthetic graphite, said cell further comprising a metallic lithium anode alloyed with aluminum.
- 22. An electrochemical cell comprising a cathode assembly, said cathode assembly comprising a metallic cathode current collector having two major surfaces and a cathode coating disposed on at least one of said two major surfaces, said cathode coating comprising iron disulfide, acetylene black, highly crystalline synthetic graphite, micronized polytetrafluoroethylene, fumed silica and a styrene-ethylene-butylene-styrene block copolymer.
Specification