Patent ID: 7722988

Claim:
An electrochemical cell comprising an anode consisting essentially of lithium or a lithium alloy; a cathode comprising iron disulfide coated on a current collector; a separator disposed between the anode and the cathode, wherein the anode, the cathode and the separator are spirally wound into a jellyroll electrode assembly; an electrolyte having 0.5 molal or less of lithium iodide dissolved in a solvent blend consisting essentially of at least 50 volume percent 1,3-dioxolane and at least one acylic ether consisting essentially of one or more organic solvents selected from the group consisting of: methyl formate, γ-butyrolactone, sulfolane, acetonitrile, N,N-dimethyl formamide, N,N-dimethylacetamide, N,N-dimethylpropyleneurea, 1,1,3,3-tetramethylurea, beta aminoenones, beta aminoketones, methyltetrahydrofurfuryl ether, diethyl ether, tetrahydrofuran, 2-methyl tetrahydrofuran, 2-methoxytetrahydrofuran and 2,5-dimethoxytetrahydrofuran; and wherein the cell delivers on a C 15 continuous discharge rate at a temperature of about −40° C. at least 30% the capacity that identically constructed cells give on the same test at a temperature of about 21° C.