Nonaqueous electrolyte material of fluorosulfonylimide lithium and application thereof

A technology of lithium fluorosulfonimide and non-aqueous electrolyte, applied in the field of non-aqueous electrolyte materials, can solve the problems of unsatisfactory flame retardant effect and the like

Active Publication Date: 2014-11-26
INST OF PHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the actual application of batteries, the presence of flame retardants as additives can improve the safety of batteries to a certain extent, but due to the presence of flammable and volatile organic solvents, the flame retardant effect is not ideal

Method used

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  • Nonaqueous electrolyte material of fluorosulfonylimide lithium and application thereof
  • Nonaqueous electrolyte material of fluorosulfonylimide lithium and application thereof
  • Nonaqueous electrolyte material of fluorosulfonylimide lithium and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] Electrolyte solution preparation: dry the conductive salt component A lithium bis(fluorosulfonyl)imide (Li[FSI]) in a vacuum, and dry the dimethyl carbonate (DMC) of the organic solvent component B into a vacuum glove box ( The water content is less than 1 ppm). Weigh 18.7g Li[FSI] in a beaker, and slowly add DMC in multiple times under magnetic stirring to prepare an electrolyte solution with a molar concentration of 1.0M, and seal it for storage for later use.

[0058] Conductivity measurement: Drop the above electrolyte solution into a glass conductivity cell with platinum electrodes at both ends, use GDW6005 high and low temperature test box to control the temperature, and HP4192 impedance spectrometer to measure the impedance spectrum (5Hz-13MHz) to obtain the temperature range The conductivity is -80℃ to 60℃. The measured electrical conductivity at -80°C is 0.2mS / cm, the electrical conductivity at 25°C is 9.2mS / cm, and the electrical conductivity at 60°C is 14.6mS / c...

Embodiment 2

[0065] Electrolyte solution preparation: the conductive salt component A lithium bis(fluorosulfonyl) imide (Li[FSI]) is dried under vacuum, the organic solvent component B is DMC and ethyl triethoxysiloxane ((CH 3 CH 2 O) 3 SiC 2 H 5 ) (Referred to as silane for short) dried and placed in a vacuum glove box (water content less than 1 ppm). Weigh 18.7g Li[FSI] in a beaker and slowly add it to the mixed solvent of DMC and sliane (DMC:silane = 1:4, volume ratio) under magnetic stirring to prepare an electrolyte with a molar concentration of 1M Solution, sealed and stored for later use.

[0066] Conductivity measurement: Drop the above electrolyte solution into a glass conductivity cell with platinum electrodes at both ends, use GDW6005 high and low temperature test box to control the temperature, and HP4192 impedance spectrometer to measure the impedance spectrum (5Hz-13MHz) to obtain the temperature range The conductivity is -80℃ to 60℃. The measured conductivity is 0.03mS / cm at -...

Embodiment 3

[0069] Electrolyte solution preparation: dry the conductive salt component A, lithium bis(fluorosulfonyl)imide (Li[FSI]), dry the organic solvent component B, DMC, and trimethyl phosphate (TMP) In a vacuum glove box (water content less than 1 ppm). Weigh 18.7g Li[FSI] in a beaker, slowly add it to the mixed solvent of dimethyl carbonate (DMC) and TMP (DMC:TMP=1:1, volume ratio) under magnetic stirring in several times to prepare The electrolyte solution with a molar concentration of 1.0M, sealed and stored for later use.

[0070] Conductivity measurement: Drop the above electrolyte solution into a glass conductivity cell with platinum electrodes at both ends, use GDW6005 high and low temperature test box to control the temperature, and HP4192 impedance spectrometer to measure the impedance spectrum (5Hz-13MHz) to obtain the temperature range The conductivity is -80℃ to 60℃. The measured conductivity is 0.1mS / cm at -80℃, 8.7mS / cm at 25℃, and 16.8mS / cm at 60℃. The conductivity of...

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Abstract

The invention provides a nonaqueous electrolyte material, which consists of fluorosulfonylimide lithium and organic solvent with dielectric constant less than 30, and the organic solvent is selected from one or more of chain-like carbonate solvent, phosphate solvent, siloxane solvent, boroxane solvent, acetate solvent, propionate solvent, butyrate solvent, CF3OCH2CH2OCF3 solvent, C2H5OCH2CH2OCH3 solvent, C2F5OCH2CH2OCF3 solvent, 1,3-dioxolane solvent and aliphatic nitrile solvent with more than two carbon atoms. The ionic conductivity of the nonaqueous electrolyte material is 0.01mS / cm to 18mS / cm, the lithium ion transference number is tLi plus equal to 0.2 to 0.8, and the applicable temperature range is 80DEG C below zero to 60DEG C below zero. The invention also provides an application of the nonaqueous electrolyte material in the preparation of lithium batteries and super capacitors. Furthermore, the invention provides a lithium battery and a super capacitor which contain the nonaqueous electrolyte material of fluorosulfonylimide lithium.

Description

Technical field [0001] The invention relates to the technical field of advanced energy and materials. Specifically, the present invention relates to a non-aqueous electrolyte material containing fluorine-sulfonimide-based lithium salt as a conductive salt and its application in lithium batteries and supercapacitors. Background technique [0002] Since the concept of rechargeable lithium batteries was put forward in the early 1970s, and its commercial application was first realized by Sony in the early 1990s, the basic research and industrial applications of rechargeable lithium batteries have rapidly become advanced Multi-disciplinary research hotspots such as energy, materials, and electrochemistry. Non-aqueous electrolyte is one of the key materials of lithium batteries, and its comprehensive properties (such as chemical and electrochemical stability, high and low temperature performance, etc.) directly affect the use of secondary lithium batteries. At present, commercial sec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/40H01G9/022C07C311/48
CPCY02E60/13
Inventor 李立飞周思思李泓黄学杰韩鸿波周志彬聂进
Owner INST OF PHYSICS - CHINESE ACAD OF SCI
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