Nonaqueous electrochemical cell with improved energy density
DCFirst Claim
1. An electrochemical cell comprising a nonaqueous electrolyte, an anode and a cathode assembly, the electrolyte comprising a solvent, the cathode assembly comprising a metallic cathode current collector having two major surfaces and a cathode coating disposed on at least one of the two major surfaces, the coating comprising iron disulfide, and the anode comprising metallic lithium, wherein the interfacial 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 gravimetrically 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 a lithium foil anode.
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Citations
65 Claims
- 1. An electrochemical cell comprising a nonaqueous electrolyte, an anode and a cathode assembly, the electrolyte comprising a solvent, the cathode assembly comprising a metallic cathode current collector having two major surfaces and a cathode coating disposed on at least one of the two major surfaces, the coating comprising iron disulfide, and the anode comprising metallic lithium, wherein the interfacial anode to cathode input ratio is less than or equal to 1.0.
- 15. An electrochemical cell comprising a nonaqueous electrolyte, an anode and a cathode assembly, the cathode assembly comprising a metallic cathode current collector having two major surfaces and a cathode coating disposed on at least one of the two major surfaces, the cathode coating comprising iron disulfide, fumed silica, acetylene black and synthetic graphite, and the anode comprising metallic lithium.
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33. An electrochemical cell comprising:
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a nonaqueous electrolyte comprising at least one solvent;
a jellyroll electrode assembly having an anode and a cathode assembly wound together;
wherein the cathode assembly comprises a metallic cathode current collector with two major surfaces and a cathode coating comprising iron disulfide disposed on at least one of said two major surfaces; and
wherein the anode comprises metallic lithium; and
wherein an interfacial anode to cathode input ratio for the jellyroll electrode assembly is less than 1.0. - View Dependent Claims (34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47)
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Specification