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, improved large-scale Power discharge performance, the effect of improving low temperature conductivity

Active Publication Date: 2021-01-26
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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PUM

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Abstract

The invention discloses a low-temperature electrolyte for a lithium cobalt disulfide primary battery and the lithium cobalt disulfide primary battery. The low-temperature electrolyte comprises a lithium salt, a solvent and a first additive, wherein the total volume molar concentration of the lithium salt in the solvent is 0.5-2 mol/L, and the addition amount of the first additive is 0-10% of the total volume of the solvent; the lithium salt comprises any one or more than two of lithium bis (trifluoromethanesulfonate) imide, lithium iodide and lithium tetrafluoroborate; the solvent comprises any two or more than two of propylene carbonate, 1, 3-dioxolane and ethylene glycol dimethyl ether; and the first additive is selected from at least one of methyl acetate, ethyl acetate, ethyl acrylate,tetrahydrofuran, fluoroethylene carbonate and fluorodiethyl carbonate. The problem that an existing lithium primary battery cannot discharge or is low in discharge capacity at the low temperature of-40 DEG C is solved, and the high-rate discharge performance of the battery at the temperature of -40 DEG C can be remarkably improved through the provided electrolyte.

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 Applications(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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