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

A cobalt disulfide and electrolyte technology, which is applied in the field of low-temperature electrolyte and lithium-cobalt disulfide primary batteries, can solve problems such as no relevant reports and no low-temperature discharge performance, and achieves improved ion transport performance and improved large-scale discharge performance. Power discharge performance, the effect of improving low temperature conductivity

Active Publication Date: 2022-03-25
SHANGHAI INST OF SPACE POWER SOURCES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be seen that the high-power low-temperature electrolyte technology used in lithium primary batteries has not yet broken through, and the reported lithium-iron disulfide has not shown excellent low-temperature discharge performance.
There are no relevant reports on high-power low-temperature electrolytes for lithium-cobalt disulfide primary batteries

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[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.

Embodiment 2

[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.

Embodiment 3

[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. .

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Abstract

The invention discloses a low-temperature electrolytic solution for a lithium-cobalt disulfide primary battery and a lithium-cobalt disulfide primary battery. The low-temperature electrolytic solution includes a lithium salt, a solvent and a first additive; The volume molar concentration of the solvent is 0.5-2mol / L, and the addition amount of the first additive is 0-10% of the total volume of the solvent; the lithium salt includes lithium bistrifluoromethanesulfonate imide, lithium iodide and lithium tetrafluoroborate Any one or any two or more of them; the solvent contains any two or more of propylene carbonate, 1,3-dioxolane and ethylene glycol dimethyl ether; the first additive is selected from methyl acetate , ethyl acetate, ethyl acrylate, tetrahydrofuran, fluoroethylene carbonate, fluorodiethyl carbonate at least one. The invention solves the problem that the existing lithium primary battery cannot be discharged or has a low discharge capacity at a low temperature of -40°C, and the provided electrolyte can significantly improve the high-rate discharge performance of the battery at -40°C.

Description

technical field [0001] The invention belongs to the technical field of lithium primary batteries, and relates to a low-temperature electrolyte for lithium-cobalt disulfide primary batteries and a lithium-cobalt disulfide primary battery. Background technique [0002] Primary batteries refer to batteries that cannot be used repeatedly by charging after use, including familiar carbon zinc-manganese batteries, alkaline zinc-manganese batteries, lithium-manganese batteries, zinc-air batteries, zinc-silver batteries, and lithium thionyl chloride batteries. Nominal voltages range from 1.4V to 3.6V to 9V. Carbon zinc-manganese and alkaline zinc-manganese batteries are more in contact with in daily life, and their voltage is more than 1.5V. At present, lithium-iron disulfide primary batteries have gradually become the first choice to replace alkaline zinc-manganese batteries and carbon zinc-manganese batteries widely used in the market due to their advantages such as large specific...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M6/16
CPCH01M6/164H01M6/166H01M6/168H01M2300/0025H01M2300/0028
Inventor 朱明苏永堂朱兼马军宋维相钱俊李长江陈彪冯炜敏
Owner SHANGHAI INST OF SPACE POWER SOURCES
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