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Novel low-temperature flame-retardant electrolyte

A technology of electrolyte and non-aqueous electrolyte, which is applied in electrolytic capacitors, circuits, capacitors, etc., can solve the problems of unsatisfactory flame retardant effects, and achieve the effects of widening the low-temperature service temperature, high ion conductivity, and high solubility

Inactive Publication Date: 2011-04-27
SHANGHAI TOPSOL IND
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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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  • Novel low-temperature flame-retardant electrolyte

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Electrolyte preparation: dry lithium bis(fluorosulfonyl)imide (Li[FSI]) in vacuum, dry battery-grade organic solvent ethyl methyl carbonate (EMC) and put it in a vacuum glove box (water content is less than 1ppm). Weigh 14.018g Li[FSI] in a beaker, then weigh 3.798g LiPF6 and add it to the beaker, and slowly add it to 100ml of EMC solvent several times under cooling condition with magnetic stirring to prepare an electrolytic solution with a molar concentration of 1.0M Liquid, sealed and stored for later use.

[0030] Conductivity measurement: Add the above electrolyte solution dropwise to a glass conductivity cell with platinum electrodes at both ends, use GDW6005 high and low temperature test chamber to control the temperature, measure impedance spectrum (5Hz-13MHz) with HP4192 impedance spectrometer, and obtain the temperature range Conductivity from -60°C to 60°C. The conductivity measured at -60°C is 0.6mS / cm, the conductivity at -40°C is 1.5mS / cm, the conductivity...

Embodiment 2

[0037] Electrolyte preparation: dry lithium bis(fluorosulfonyl)imide (Li[FSI]) in vacuum, ethyl methyl carbonate (EMC) and trimethyl phosphate (TMP) of organic solvent component B are dried and placed in vacuum gloves In the box (water content less than 1ppm). Weigh 14.018g Li[FSI] and 3.798g LiPF6 in beaker, under magnetic stirring, slowly join in the mixed solvent ( EMC:TMP=1:1, volume ratio), prepared into 1.0M electrolyte solution, sealed and stored for later use.

[0038] Conductivity measurement: Add the above electrolyte solution dropwise to a glass conductivity cell with platinum electrodes at both ends, use GDW6005 high and low temperature test chamber to control the temperature, measure impedance spectrum (5Hz-13MHz) with HP4192 impedance spectrometer, and obtain the temperature range Conductivity from -60°C to 60°C. The conductivity measured at -60°C is 0.9mS / cm, the conductivity at -40°C is 2.0mS / cm, the conductivity at -20°C is 2.6mS / cm, and the conductivity at ...

Embodiment 3

[0041] Electrolyte preparation: lithium bis(fluorosulfonyl)imide (Li[FSI]) was vacuum-dried, together with lithium hexafluorophosphate, and organic solvent components of dimethyl phosphate (TMMP) and triethoxyboroxane ( TEOBX) was dried and placed in a vacuum glove box (water content less than 1ppm). Weigh 14.018g Li[FSI] in a beaker, then weigh 3.798g lithium hexafluorophosphate and add it to the beaker. Under cooling and magnetic stirring, slowly add dimethyl methyl phosphate (TMMP) with a total volume of 100 ml in several times. and triethylboroxane (TEOBX) in a mixed solvent (DMMP: TEOBX = 3: 1 volume ratio) to prepare a 1M electrolyte solution, sealed and stored for use.

[0042] Conductivity measurement: Add the above electrolyte solution dropwise to a glass conductivity cell with platinum electrodes at both ends, use GDW6005 high and low temperature test chamber to control the temperature, measure impedance spectrum (5Hz-13MHz) with HP4192 impedance spectrometer, and ob...

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Abstract

The invention discloses novel low-temperature flame-retardant electrolyte. The electrolyte contains fluorine-containing sulphonylimine lithium, lithium hexafluorophosphate and an organic solvent with lower dielectric constant, wherein the molar concentration of mixed lithium in a nonaqueous electrolytic solution is 0.5-2mol / L, and the molar ratio of the fluorine-containing sulphonylimine lithium and the lithium hexafluorophosphate is 1-5:1; and the organic solvent with lower dielectric constant is selected from one or several of chain carbonic ester, phosphate and a boroxane solvent. The electrolyte provided by the invention can have higher conductivity within the temperature range of -60 to 60 DEG C, and a lithium secondary battery prepared by using the electrolyte has higher battery efficiency within the temperature range, thereby ensuring that the electrolyte and the lithium secondary battery are used in wide temperature range with higher fire resistance and safety.

Description

technical field [0001] The invention relates to a novel low-temperature flame-retardant electrolyte and its application, which belongs to the technical field of advanced energy and materials, and specifically relates to the flame-retardant application in a low-temperature environment in a secondary lithium battery. Background technique [0002] In recent years, the development and application of lithium secondary batteries with high energy density have been widely developed, especially the application of high-power power batteries, which put forward higher requirements for lithium secondary batteries, as the key materials of lithium secondary batteries ——Non-aqueous electrolyte needs to be improved revolutionaryly. [0003] At present, commercial secondary lithium battery electrolytes are mainly composed of organic carbonates, such as dimethyl carbonate (DMC), diethyl carbonate (DEC), ethylene carbonate (EC), etc., and conductive salts (mainly LiPF 6 )composition. The opti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/40H01G9/035
Inventor 胡小春
Owner SHANGHAI TOPSOL IND
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