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Hydrofluoroether sulfones compound and preparation method thereof as well as lithium-ion battery electrolyte

A lithium-ion battery and compound technology, applied in the field of lithium-ion batteries, can solve the problems of high melting point and high viscosity, and achieve the effects of high electrical conductivity, improved pressure resistance and good compatibility.

Active Publication Date: 2014-04-30
湖南福邦新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the disadvantages of high melting point and high viscosity of sulfone compounds, it needs to be used with a co-solvent

Method used

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  • Hydrofluoroether sulfones compound and preparation method thereof as well as lithium-ion battery electrolyte
  • Hydrofluoroether sulfones compound and preparation method thereof as well as lithium-ion battery electrolyte
  • Hydrofluoroether sulfones compound and preparation method thereof as well as lithium-ion battery electrolyte

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0069] 1.1 161g (2mol) Cl-CH 2 CH 2 -OH was added to a 0.5L flask, 28g (0.5mol) potassium hydroxide was added under stirring, and then the system gas was replaced with nitrogen three times, heated to 35°C, and 100.8g (2.1mol) CH 3 -SH was slowly added dropwise to the flask. During the dropping process, the temperature of the system was maintained between 30°C and 40°C with a room temperature water bath. After the dropping was completed, stirring was continued for 1 hour at room temperature, and the mixture was rectified under reduced pressure to obtain the product hydroxyethyl Methyl sulfide has a purity of 99.9% and a yield of 84%.

[0070] 1.2 Add 184g (2mol) of the hydroxyethyl methyl sulfide obtained in 1.1 to a 0.5L flask, slowly add 128g (4mol) of hydrogen peroxide dropwise under vigorous stirring, and keep the reaction by cooling water in a room temperature water bath during the dropwise addition The temperature is between 20°C and 30°C. After the dropping is completed, the...

Embodiment 2

[0078] Add 248g (2mol) of hydroxyethyl methyl sulfone obtained in 1.2 to a 0.5L autoclave, add 28g (2mol) of potassium hydroxide under stirring conditions, seal the reactor, evacuate, and replace the system gas with nitrogen three times , Then vacuumize, feed in 0.1Mpa hexafluoropropylene, heat to 60°C, intermittently feed in hexafluoropropylene, keep the pressure in the kettle at 0.3-0.4MPa, stop the reaction when the pressure in the reactor no longer changes, and use water for the mixture After washing and phase separation, add 10ml of bromine to the organic phase, stir for 2 hours at room temperature, and then add sodium thiosulfate solution to wash until it is neutral. After phase separation, rectify to obtain the formula (I-2) with a purity of 99.9% The yield of hydrofluoroether sulfone compounds is 70%.

[0079]

[0080] The hydrofluoroether sulfone compound represented by formula (I-2) obtained in Example 2 was tested by nuclear magnetic resonance, and its proton nuclear m...

Embodiment 3

[0082] Add 248g (2mol) of hydroxyethyl methyl sulfone obtained in 1.2 to a 0.5L autoclave, add 28g (2mol) of potassium hydroxide under stirring conditions, seal the reactor, evacuate, and replace the system gas with nitrogen three times , Then vacuumize, feed in 0.1Mpa tetrafluoropropylene, heat to 60℃, and intermittently feed in 200g (2mol) tetrafluoropropylene, keep the pressure in the kettle at 0.3~0.4MPa, and stop the reaction when the pressure in the reactor no longer changes , The mixture was washed with water, after phase separation, 10ml bromine was added to the organic phase, stirred at room temperature for 2h, and then sodium thiosulfate solution was added to wash until it became neutral. After phase separation, rectified to obtain the formula (I-3) with a purity of 99.9% The yield of the hydrofluoroether sulfone compound shown in) was 71%.

[0083]

[0084] The hydrofluoroether sulfone compound represented by formula (I-3) obtained in Example 3 was tested by nuclear ma...

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Abstract

The invention provides a hydrofluoroether sulfones compound and a preparation method thereof as well as lithium-ion battery electrolyte. The lithium-ion battery electrolyte comprises a lithium salt, a solvent and the hydrofluoroether sulfones compound shown as the formula (I). Compared with the prior art, the hydrofluoroether sulfones compound is added into the hydrofluoroether sulfones compound shown as the formula (I) contains a hydrofluoroether radical. Firstly, the hydrofluoroether sulfones compound shown as the formula (I) keeps the high voltage resistance advantage of the sulfones compound and the high voltage resistance of the electrolyte can be improved; the hydrofluoroether radical is good for overcoming the disadvantages of the sulfones compound that the smelting point and the viscosity are high and has high conductivity; then, the hydrofluoroether sulfones compound, an electrolyte common solvent and the lithium salt have good compatibility and a homogeneous solution is easy to form; finally, the hydrofluoroether sulfones compound shown as the formula (I) has the advantages of hydrofluoroether compounds and is good for improving the flashing point of the electrolyte, so that the electrolyte has good fire resistance.

Description

Technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to hydrofluoroether sulfone compounds, a preparation method thereof, and lithium ion battery electrolyte. Background technique [0002] Safety is a key issue restricting the development of large-capacity and high-power lithium-ion batteries. Currently, the electrolytes of lithium ion secondary batteries, super batteries and capacitors widely use organic carbonates as solvents, such as propylene carbonate (PC), ethylene carbonate (EC), dimethyl carbonate (DMC), etc. Liquid has excellent electrochemical performance, but due to the shortcomings of low flash point (below 30°C) and flammability of organic carbonate, the battery is very easy to catch fire and even explode under overcharge and overheating conditions. Therefore, in recent years, battery research has mainly focused on two aspects. One is to explore electrolytes with higher flash points or even incombust...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C317/18C07C315/04H01M10/0567
CPCY02E60/10
Inventor 周济苍洪满贵仲晓玲
Owner 湖南福邦新材料有限公司
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