Lithium iron disulfide battery
First Claim
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1. An electrochemical cell comprising:
- an anode consisting essentially of lithium or a lithium alloy;
a cathode coated onto a solid current collector, said cathode coating comprising iron disulfide as an active material;
a high temperature polymeric separator having a scaffold structure comprising a first polymer and filling polymer comprising a second polymer, wherein;
the first polymer is selected from;
polyimide, polyester, polyamide, poly(phthalamide), or poly(vinyl chloride); and
the second polymer is selected from;
poly(vinylidene fluoride), polyacrylate, or a polyethylene copolymer;
an electrolyte consisting of one or more solutes dissolved in one or more liquid solvents, said electrolyte being physically distinct from the separator;
wherein the anode, the cathode and the separator are spirally wound;
wherein the second polymer fills interstices of the scaffold structure and the electrolyte is at least partially absorbed by the second polymer; and
wherein the first polymer does not soften at an expected discharge temperature for the cell.
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Abstract
A lithium-iron disulfide battery with improved high temperature performance is disclosed. The separator characteristics are deliberately selected to be compatible with the electrolyte at the intended temperature. Additional or alternative modifications can be made in the form of a scaffold or laminated structure. A preferred polymer for such separators is polyimide.
29 Citations
14 Claims
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1. An electrochemical cell comprising:
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an anode consisting essentially of lithium or a lithium alloy; a cathode coated onto a solid current collector, said cathode coating comprising iron disulfide as an active material; a high temperature polymeric separator having a scaffold structure comprising a first polymer and filling polymer comprising a second polymer, wherein; the first polymer is selected from;
polyimide, polyester, polyamide, poly(phthalamide), or poly(vinyl chloride); andthe second polymer is selected from;
poly(vinylidene fluoride), polyacrylate, or a polyethylene copolymer;an electrolyte consisting of one or more solutes dissolved in one or more liquid solvents, said electrolyte being physically distinct from the separator; wherein the anode, the cathode and the separator are spirally wound; wherein the second polymer fills interstices of the scaffold structure and the electrolyte is at least partially absorbed by the second polymer; and wherein the first polymer does not soften at an expected discharge temperature for the cell. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An electrochemical cell comprising:
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an anode consisting essentially of lithium or a lithium alloy; a cathode coated onto a solid current collector, said cathode coating comprising iron disulfide as an active material; a high temperature polymeric separator having a scaffold structure comprising a first polymer and filling polymer comprising a second polymer; an electrolyte consisting of one or more solutes dissolved in one or more liquid solvents, said electrolyte being physically distinct from the separator; wherein the anode, the cathode and the separator are spirally wound; wherein the scaffold structure is insoluble in the electrolyte and the filling polymer is soluble in the electrolyte and the filling polymer fills interstices of the scaffold structure and the electrolyte is at least partially absorbed by the filling polymer; and wherein the scaffold structure does not soften at an expected discharge temperature for the cell. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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Specification