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Ternary perfluor organic molten salt electrolyte, preparation method and application thereof

A technology of organic molten salt and electrolyte, which is applied in the field of ternary perfluorinated organic molten salt electrolyte and its preparation, and can solve the problem of low thermal stability

Inactive Publication Date: 2011-05-25
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] For the binary molten salt electrolyte system LiN(CF 3 SO 2 ) 2 -CF 3 SO 3 Na and LiN(CF 3 SO 2 ) 2 -CF 3 SO 3 K has the problems of low thermal stability and electrical conductivity, and the present invention provides a perfluorinated organic molten salt with low melting point, high electrical conductivity, wide electrochemical window, good thermal stability and electrochemical performance electrolyte

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Weigh the dried CF 3 SO 3 Li2g, CF 3 SO 3 Na 3g and CF 3 SO 3 Put K 5g in a mortar, mix and grind thoroughly, then heat and melt the mixture, and grind it evenly after recooling to form a low-temperature molten salt system. Weigh about 10 mg from the mixed molten salt and measure its thermal properties with a Pyris Diamond TG / DTA (Seiko Instruments) thermogravimetric analyzer. It is found that its melting point is 180° C. and its thermal decomposition temperature is above 420° C.

[0031] Put the sample into a conductivity cell designed by ourselves to measure the conductivity of molten salt, use the AutoLab PGSTAT 30 electrochemical workstation, and use the AC impedance method to measure its conductivity within the frequency range of 100KHz to 1Hz. When the conductivity is 65mS / cm. The electrical conductivity of the sample was measured in the temperature range of 230-270 °C. The electrical conductivity increased with the temperature, and the electrical conductivi...

Embodiment 2

[0034] Weigh the dried LiN(CF 3 SO 2 ) 2 5 g, CF 3 SO 3 Li 3g and CF 3 SO 3Put 10g of K in a mortar, mix and grind thoroughly, then heat and melt the mixture, and grind it evenly after recooling to form a low-temperature molten salt system. Weigh about 10 mg from the mixed molten salt and measure its thermal properties with a Pyris Diamond TG / DTA (Seiko Instruments) thermogravimetric analyzer. It is found that its melting point is 145° C. and its thermal decomposition temperature is above 340° C. Its conductivity at 250°C is 45mS / cm, and its electrochemical stability window is 4.3V.

Embodiment 3

[0036] Weigh the dried LiN(CF 3 SO 2 ) 2 3g, CF 3 SO 3 Li 2.5g and CF 3 SO 3 Put Na7g in a mortar, mix and grind thoroughly, then heat and melt the mixture, and grind it evenly after recooling to form a low-temperature molten salt system. Weigh about 10 mg from the mixed molten salt and measure its thermal properties with a Pyris Diamond TG / DTA (Seiko Instruments) thermogravimetric analyzer. It is found that its melting point is 187° C. and its thermal decomposition temperature is above 340° C. Its conductivity at 250°C is 60 mS / cm. When the temperature is 270℃, the electrochemical stability window is 4.2V.

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Abstract

The invention discloses a ternary perfluor organic molten salt electrolyte, preparation method and application thereof. The perfluor organic molten salt electrolyte is prepared from one perfluor organic lithium salt and two non-lithium alkali metal perfluor organic salts, or from two perfluor organic lithium salts and one non-lithium alkali metal perfluor organic salt, wherein the total mole fraction of the perfluor organic lithium salt is 10 to 70%. The preparation method is as follows: respectively weighing the required raw material components based on proportion; fully and evenly mixing theselected raw material components; then heating and fusing the mixture; then evenly milling the mixture after re-cooled so as to obtain the perfluor organic molten salt electrolyte. The molten salt electrolyte of the invention is advantageous in low melting point, high electrical conductivity, wide electrochemical window, excellent thermal stability and electrochemical performance. The invention can be applied to the fields, for example, lithium thermal battery.

Description

(1) Technical field [0001] The invention relates to a ternary perfluorinated organic molten salt electrolyte and its preparation method and application, especially the application in lithium-based thermal batteries. (2) Technical background [0002] Usually, molten salt contains at least one kind of salt, and is usually applied in a molten state. Molten salt has the advantages of low vapor pressure, low viscosity and good electrical conductivity in a wide temperature range. These characteristics determine that molten salt has a wide range of applications in industrial electrolysis, nuclear energy industry and material industry. [0003] Due to the special properties of molten salt, it is also widely used in thermal batteries. Thermal battery is a kind of reserve battery, which uses the heating system of the battery itself to heat and melt the non-conductive solid-state electrolyte to present an ionic conductor and enter a heat-activated reserve battery in a working state. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M6/16H01M6/36
CPCY02E60/12
Inventor 马淳安屠晓华褚有群
Owner ZHEJIANG UNIV OF TECH
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