A low-temperature electrolyte for lithium-cobalt disulfide primary battery and lithium-cobalt disulfide primary battery

[0017] A low-temperature electrolytic solution for a high-power lithium-cobalt disulfide primary battery prepared by the invention consists of a lithium salt, a solvent and an additive. The mass percentage of lithium bistrifluoromethanesulfonate imide in the lithium salt is 50%, the mass percentage of lithium iodide is 0%, and the mass percentage of lithium tetrafluoroborate is 50%. The three lithium salts The total volume molar concentration in the solvent is 0.5mol / L. The volume fraction of propylene carbonate in the solvent is 30%, the volume fraction of 1,3-dioxolane is 40%, and the volume fraction of ethylene glycol dimethyl ether is 30%. Methyl acetate is used as an additive in an amount of 10% of the total solvent volume in the electrolyte. The lithium-cobalt disulfide AAA primary battery containing the above electrolyte can be discharged at a rate of 0.2C at -40°C, and the discharge capacity reaches 70% of the design capacity.

[0019] A low-temperature electrolytic solution for a high-power lithium-cobalt disulfide primary battery prepared by the invention consists of a lithium salt, a solvent and an additive. The mass percentage of lithium bistrifluoromethanesulfonate imide in the lithium salt is 30%, the mass percentage of lithium iodide is 40%, and the mass percentage of lithium tetrafluoroborate is 30%. The three lithium salts The total volume molar concentration in the solvent is 0.5mol / L. The volume fraction of propylene carbonate in the solvent is 0%, the volume fraction of 1,3-dioxolane is 60%, and the volume fraction of ethylene glycol dimethyl ether is 40%. Methyl acetate is used as an additive in an amount of 10% of the total solvent volume in the electrolyte. The lithium-cobalt disulfide AAA primary battery containing the above electrolyte can be discharged at a rate of 0.2C at -40°C, and the discharge capacity reaches 65% of the design capacity.

[0021] A low-temperature electrolytic solution for a high-power lithium-cobalt disulfide primary battery prepared by the invention consists of a lithium salt, a solvent and an additive. The mass percentage of lithium bistrifluoromethanesulfonate imide in the lithium salt is 30%, the mass percentage of lithium iodide is 40%, and the mass percentage of lithium tetrafluoroborate is 30%. The three lithium salts The total volume molar concentration in the solvent is 2mol / L. The volume fraction of propylene carbonate in the solvent is 0%, the volume fraction of 1,3-dioxolane is 60%, and the volume fraction of ethylene glycol dimethyl ether is 40%. Ethyl acetate is used as an additive in an amount of 10% of the total solvent volume in the electrolyte. The lithium-cobalt disulfide AAA primary battery containing the above electrolyte can be discharged at a rate of 0.2C at -40°C, and the discharge capacity reaches 60% of the design capacity. .