Lithium battery electrolyte and preparing method thereof

An electrolyte and lithium battery technology, applied in the field of fine chemicals, to achieve the effects of high electrical conductivity, high electrochemical stability and wide electrochemical window

Inactive Publication Date: 2017-05-31
重庆汉岳科技发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In view of the problems existing in the current lithium battery electrolyte, the purpose of the present invention is to provide a lithium battery electrolyte that can improve the electrochemical stability of the lithium battery, has a higher conductivity and a wider electrochemical window, and a preparation method thereof

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Pass the propylene carbonate through a molecular sieve dehydration device to remove the moisture contained in the propylene carbonate, and then add lithium hexafluorophosphate and N,N-dimethyl-N-ethyl-N-2-methoxyethylammonium bis(trifluoro Methylamide) imide salt is dissolved in propylene carbonate to obtain lithium hexafluorophosphate content is 1mol / L, DEMETf 2 An electrolyte with a N content of 0.1mol / L. After testing, at 25°C, 1mol / L lithium hexafluorophosphate and 0.1mol / L DEMETf 2 The conductivity of N in propylene carbonate is 12.70mS·cm -1 , composed of lithium hexafluorophosphate and DEMETf 2 The electrolyte composed of N in propylene carbonate solution can ensure the stable cycle of the capacitor under the voltage of 3.5V.

Embodiment 2

[0014] Pass the mixed solvent composed of propylene carbonate, ethylene carbonate and γ-butyl lactone in a volume ratio of 2:1:1 through a molecular sieve dehydration device to remove the water contained in the mixed solvent, and then lithium hexafluorophosphate and N, N-di Methyl-N-ethyl-N-2-methoxyethylammonium bis(trifluoromethylamide) imide salt is dissolved in mixed solvent to obtain lithium hexafluorophosphate content is 1mol / L, DEMETf 2 An electrolyte with a N content of 0.5mol / L. After testing, at 25°C, 1mol / L lithium hexafluorophosphate and 0.5mol / L DEMETf 2 The conductivity of N in the mixed solvent is 12.90mS·cm -1 , the above-mentioned electrolyte can guarantee the stable circulation of the capacitor under the voltage of 3.5V.

Embodiment 3

[0016] A mixed solvent composed of ethylene carbonate, sulfolane, 3-methylsulfolane and acetonitrile in a volume ratio of 3:2:1:1 is passed through a molecular sieve dehydration device to remove the moisture contained in the mixed solvent, and then lithium hexafluorophosphate and N,N- Dimethyl-N-ethyl-N-2-methoxyethylammonium bis(trifluoromethylamide) imide salt is dissolved in mixed solvent to obtain lithium hexafluorophosphate content is 1mol / L, DEMETf 2 An electrolyte with a N content of 1mol / L. After testing, it can be obtained that at 25°C, 1mol / L lithium hexafluorophosphate and 1mol / L DEMETf 2 The conductivity of N in the mixed solvent is 13.00mS·cm -1 , the above-mentioned electrolyte can guarantee the stable circulation of the capacitor under the voltage of 3.5V.

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Abstract

The invention discloses a lithium battery electrolyte and a preparing method thereof. Water contained in a non-aqueous solvent is removed through a molecular sieve dehydrating device, and then lithium hexafluorophosphate and N,N-dimethyl-N-ethyl-N-2-methoxyethyl ammonium bis(trifluoromethylformamide) imide are dissolved in the non-aqueous solvent, so that the electrolyte is prepared. The non-aqueous solvent is one or more propylene carbonate, ethylene carbonate, 1,4-butyrolactone, N,N-dimethylformamide, tetramethylene sulfone, 3-methylsulfolane and acetonitrile. The lithium battery electrolyte prepared through the preparing method is high in electrochemical stability, and has high electrical conductivity and a wide electrochemical window.

Description

technical field [0001] The invention relates to the field of fine chemicals, in particular to a lithium battery electrolyte and a preparation method thereof. Background technique [0002] With the rapid development of the new energy vehicle industry, lithium batteries, as one of many power batteries, show superior characteristics, and electrolyte, as an important part of lithium batteries, has an important influence on the electrochemical performance of lithium batteries. The performance requirements for the electrolyte usually include high electrical conductivity, high thermal stability, high chemical stability, wide chemical window, and non-toxic safety. The current commercial electrolytes still have insufficient electrochemical stability. Electrolytes used in the field of electrochemistry need to study their various electrical properties, the most important being the electrochemical window and conductivity. Ionic liquids have the characteristics of wide electrochemical ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0568
CPCH01M10/0568H01M2300/0025Y02E60/10
Inventor 任岳
Owner 重庆汉岳科技发展有限公司
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