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Electrolyte additive, electrolyte containing electrolyte additive and lithium ion battery

A technology for electrolyte additives and lithium-ion batteries, which is applied in the field of electrolytes, electrolyte additives, and lithium-ion batteries. Effect of electrolyte requirement

Active Publication Date: 2021-04-09
SHANGHAI INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, with the increase of working voltage and energy density, the safety and stability of the battery are worse and the life is shorter

Method used

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  • Electrolyte additive, electrolyte containing electrolyte additive and lithium ion battery
  • Electrolyte additive, electrolyte containing electrolyte additive and lithium ion battery
  • Electrolyte additive, electrolyte containing electrolyte additive and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] The chemical formula of the electrolyte additive used in the present embodiment is C 15 h 4 F 17 NS 2 , the structural formula is:

[0042]

[0043] The preparation process of this additive is:

[0044] 2-Mercaptobenzothiazole (0.4 mmol), perfluoro-n-octyl iodide (0.6 mmol), tetramethylethylenediamine TMEDA (0.6 mmol) and 5 mL of acetonitrile were added to a clean pressure-resistant tube. Subsequently, the reaction mixture was stirred for 2 hours under light. After the reaction was completed, add 10 mL of deionized water, extract three times with 15 mL of dichlorohexane or ethyl acetate, combine the organic phases, wash once with deionized water and brine, and wash with anhydrous Na 2 SO 4 Drying, filtering, rotary evaporation to remove the solvent, and purification by silica gel column chromatography can obtain a perfluorinated substituent electrolyte additive with a corresponding carbon chain length.

[0045] The mass spectrum curve of the additive is as fol...

Embodiment 2

[0049] The chemical formula of the electrolyte additive used in the present embodiment is C 11 h 4 F 9 NS 2 , the structural formula is:

[0050]

[0051] The preparation process of this additive is:

[0052] 2-Mercaptobenzothiazole (0.4mmol), perfluoro-n-butyl iodide (0.6mmol), tetramethylethylenediamine TMEDA (0.6mmol) and 5mL acetonitrile were respectively added into a clean pressure-resistant tube. Subsequently, the reaction mixture was stirred for 2 hours under light. After the reaction was completed, add 10 mL of deionized water, extract three times with 15 mL of dichlorohexane or ethyl acetate, combine the organic phases, wash once with deionized water and brine, and wash with anhydrous Na 2 SO 4 Drying, filtering, rotary evaporation to remove the solvent, and purification by silica gel column chromatography can obtain a perfluorinated substituent electrolyte additive with a corresponding carbon chain length.

[0053] The mass spectrum curve of the additive is...

Embodiment 3

[0057] The chemical formula of the electrolyte additive used in the present embodiment is C 13 h 4 F 13 NS 2 , the structural formula is:

[0058]

[0059] The preparation process of this additive is:

[0060] 2-Mercaptobenzothiazole (0.4mmol), perfluoro-n-hexane iodide (0.6mmol), tetramethylethylenediamine TMEDA (0.6mmol) and 5mL of acetonitrile were respectively added into a clean pressure-resistant tube. Subsequently, the reaction mixture was stirred for 2 hours under light. After the reaction was completed, add 10 mL of deionized water, extract three times with 15 mL of dichlorohexane or ethyl acetate, combine the organic phases, wash once with deionized water and brine, and wash with anhydrous Na 2 SO 4 Drying, filtering, rotary evaporation to remove the solvent, and purification by silica gel column chromatography can obtain a perfluorinated substituent electrolyte additive with a corresponding carbon chain length.

[0061] Assemble the battery:

[0062] LiNi ...

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Abstract

The present invention relates to an electrolyte additive, an electrolyte containing the additive, and a lithium ion battery, the electrolyte additive is an indol-based fluorine substituent or a derivative thereof, and the functional design of different electrolyte additives can be achieved through the design and regulation of polyfluoro substituents with different chain lengths. By introducing the S element, the structure of the additive can be stabilized; and the electrolyte additive is added into the lithium ion battery electrolyte to obtain the electrolyte containing the additive. Compared with the prior art, the fluorine-containing additive disclosed by the invention can form excellent fluorine-substituted solid electrolyte interface layers on the surfaces of the positive electrode and the negative electrode of the lithium ion battery, so that the high-voltage endurance capacity and the wide-voltage-interval cycle performance of the lithium ion battery can be remarkably improved, and the usage amount of electrolyte of the lithium ion battery can be remarkably reduced; the lithium ion soft package battery prepared on the basis of the additive has very stable and excellent performance and has the broad industrial application prospect.

Description

technical field [0001] The invention belongs to the technical field of chemical power sources and energy materials, and relates to an electrolyte additive, an electrolyte containing the additive, and a lithium ion battery. Background technique [0002] With the continuous development of energy technology, more and more energy storage systems have emerged and attracted people's attention. Among them, lithium-ion batteries have received extensive attention and research due to their high specific energy, long cycle life, and stable and safe operating conditions. The ever-increasing requirements for the indicators of the energy storage system make the parameters of the lithium-ion battery more and more high. The specific performance is: the material is required to achieve a higher specific capacity and work stably at a higher voltage; the electrolyte is required to have higher safety and not decompose under high voltage, etc. [0003] At present, the upper limit of the operati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0566H01M10/0525H01M10/42
CPCH01M10/0567H01M10/0566H01M10/0525H01M10/4235H01M2300/0025Y02E60/10
Inventor 张全生王勇
Owner SHANGHAI INST OF TECH
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