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An electrolyte system suitable for a molten salt electrolyte battery is described where the electrolyte system is a molten nitrate compound, an organic compound containing dissolved lithium salts, or a 1-ethyl-3-methlyimidazolium salt with a melting temperature between approximately room temperature

An electrolyte system suitable for a molten salt electrolyte battery is described where the electrolyte system is a molten nitrate compound, an organic compound containing dissolved lithium salts, or a 1-ethyl-3-methlyimidazolium salt with a melting temperature between approximately room temperature and approximately 250° C. With a compatible anode and cathode, the electrolyte system is utilized in a battery as a power source suitable for oil/gas borehole applications and in heat sensors.

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1. An electrolyte system suitable for a molten salt electrolyte battery, the electrolyte system comprising a material with a melting temperature between approximately room temperature and approximately 250° C., said material selected from at least one molten nitrate compound having a melting point t

1. An electrolyte system suitable for a molten salt electrolyte battery, the electrolyte system comprising a material with a melting temperature between approximately room temperature and approximately 250° C., said material selected from at least one molten nitrate compound having a melting point temperature of less than approximately 250° C., said molten nitrate compound consisting essentially of a mixture of lithium nitrate, potassium nitrate, and cesium nitrate, at least one organic compound containing dissolved lithium salts, and at least one 1-ethyl-3-methylimidazolium salt. 2. The electrolyte system of claim 1 wherein the molten nitrate compound is combined with a nitrate compound. 3. The electrolyte system of claim 1 wherein the organic compound containing dissolved lithium salts is an organic compound selected from propylene carbonate, ethylene carbonate, dimethyl sulfone and di-p-tolylsulfone containing at least one dissolved lithium salt selected from LiPF6,LiAsF6,LiClO4,Li triflate salts and Li imide salts. 4. The electrolyte system of claim 1 wherein the 1-ethyl-3-methylimidazolium salt is selected from 1-ethyl-3-methylimidazolium tetrafluoroborate, 1-ethyl-3-methylimidazolium triflate and 1-ethyl-3-methylimidazolium mesylate. 5. A battery for operation with a molten salt electrolyte comprising an anode, a cathode and an electrolyte system in accordance with claim 1. 6. The battery of claim 5 wherein said anode is made from a material selected from an lithium-aluminum alloy, an lithium-silicon alloy, a calcium alloy, a magnesium alloy, a zinc alloy, a lithium-boron alloys, and a molten lithium immobilized with a metal selected from nickel, copper and stainless steel Feltmetal. 7. The battery of claim 5 wherein the lithium-aluminum alloy has between approximately 20 w/w % from 25 w/w % lithium. 8. The battery of claim 5 wherein the lithium-silicon alloy has between approximately 40 w/w % to approximately 55 w/w % lithium. 9. The battery of claim 5 wherein the cathode is made from a material selected from Ag2CrO4,V2O5,LiCoO2,LiNiO2,LiNixCo1-xO2,CrO2,lithiated Cr oxides, MnO2,and lithiated manganese oxides.