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An electrolyte additive and electrolyte and lithium ion battery containing the additive

An electrolyte additive, lithium-ion battery technology, applied in the field of lithium-ion battery, electrolyte, electrolyte additive, can solve the problems of short life, poor battery safety and stability, etc., to improve pressure resistance, good electrochemical performance, capacity The effect of retention rate improvement

Active Publication Date: 2022-07-19
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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  • An electrolyte additive and electrolyte and lithium ion battery containing the additive
  • An electrolyte additive and electrolyte and lithium ion battery containing the additive
  • An electrolyte additive and electrolyte and lithium ion battery containing the additive

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] The chemical formula of the electrolyte additive used in this example is C 15 H 4 F 17 NS 2 , the structural formula is:

[0042]

[0043] The preparation process of the additive is as follows:

[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, respectively. Subsequently, the reaction mixture was stirred under light for 2 hours. After the reaction was completed, 10 mL of deionized water was added, extracted three times with 15 mL of dichlorohexane or ethyl acetate, the organic phases were combined, washed once with deionized water and brine respectively, and washed with anhydrous Na 2 SO 4 Drying, filtration, rotary evaporation to remove the solvent, and purification by silica gel column chromatography can obtain the perfluoro-substituted electrolyte additive with the corresponding carbon chain length.

[0045] The ...

Embodiment 2

[0049] The chemical formula of the electrolyte additive used in this example is C 11 H 4 F 9 NS 2 , the structural formula is:

[0050]

[0051] The preparation process of the additive is as follows:

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

[0053] The m...

Embodiment 3

[0057] The chemical formula of the electrolyte additive used in this example is C 13 H 4 F 13 NS 2 , the structural formula is:

[0058]

[0059] The preparation process of the additive is as follows:

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

[0061] Asse...

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Abstract

The invention relates to an electrolyte additive, an electrolyte and a lithium ion battery containing the additive. The electrolyte additive is a fluorine substitute of an indolyl group or a derivative thereof, and through the design and regulation of polyfluorine substituents with different chain lengths, The functional design of different electrolyte additives can be realized, and the structure of the additives can be stabilized by the introduction of S element; the electrolyte solution additive is added to the lithium ion battery electrolyte to obtain an electrolyte solution containing the additive. Compared with the prior art, the fluorine-containing additive in the present invention can form an excellent fluorine-substituted solid-state electrolyte interface layer on the surface of the positive and negative electrodes of the lithium ion battery, which can significantly improve the high voltage withstand capability and wide voltage of the lithium ion battery. The interval cycle performance and the use of lithium-ion battery electrolyte are significantly reduced. The lithium-ion soft pack battery prepared based on the additive has very stable and excellent performance, and has a good 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 and a lithium ion battery containing the additive. Background technique [0002] With the continuous development of energy technology, more and more energy storage systems appear and attract 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 increasing index requirements of energy storage systems make the parameters of lithium-ion batteries higher and higher. The specific performance is as follows: the material is required to achieve higher specific capacity and work stably at higher voltage; the electrolyte is required to have higher safety and not decompose under high voltage. [0003] At present, the upper limit of the working voltage of commercial lithium-...

Claims

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Application Information

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Patent Type & Authority Patents(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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