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Sulfur-containing ionic liquid, and preparation method and application thereof

An ionic liquid and electrolyte technology, applied in the field of lithium-ion batteries, can solve the problems of unfavorable lithium-ion battery electrolytes, reduced stability of ionic liquids, narrowed electrochemical windows, etc., and achieves cheap and easy-to-obtain raw materials and good thermal stability. , the effect of high decomposition voltage

Inactive Publication Date: 2014-06-04
OCEANS KING LIGHTING SCI&TECH CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the ionic liquid prepared by the two-step method will inevitably introduce halogen elements, and these halogen impurity ions will lead to the disadvantages of reduced stability, increased melting point and narrowed electrochemical window of the ionic liquid, which is not conducive to its application in Li Electrolyte for ion batteries

Method used

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  • Sulfur-containing ionic liquid, and preparation method and application thereof
  • Sulfur-containing ionic liquid, and preparation method and application thereof
  • Sulfur-containing ionic liquid, and preparation method and application thereof

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preparation example Construction

[0041] A preparation method of the above-mentioned sulfur-containing ionic liquid, the preparation process is as follows:

[0042]

[0043] Wherein RY is methyl trifluoromethanesulfonate, ethyl trifluoromethanesulfonate, propyl trifluoromethanesulfonate, butyl trifluoromethanesulfonate, methyl trifluoroacetate, ethyl trifluoroacetate, trifluoroacetic acid Propyl ester or butyl trifluoroacetate; R is an alkyl group with 1 to 4 carbon atoms, Y - for CF 3 SO 3 - or CF 3 CO 2 - .

[0044] Specifically include the following steps:

[0045] Step S1: Under the protection of an inert atmosphere, add dimethyl sulfide and the alkylating agent RY to an organic solvent in a molar ratio of 1:1 to 1.2:1, the mass ratio of the organic solvent to the dimethyl sulfide is The ratio is 0.8:1 to 1.4:1, and the reaction is stirred for 5 hours to 30 hours at a temperature of 5°C to 35°C.

[0046] Wherein, the alkylating reagent RY is methyl trifluoromethanesulfonate, ethyl trifluorometh...

Embodiment 1

[0077] Add 70g of chloroform, (68.3g, 1.1mol) dimethyl sulfide, (164.1g, 1.0mol) methyl trifluoromethanesulfonate into a 500mL flask respectively, and raise the temperature to 25°C under a nitrogen atmosphere, and stir the reaction for 20 Hour. Stand to cool, carry out vacuum distillation at a temperature of 100°C and a pressure of 3.0Pa to remove excess reactants, collect the colorless liquid and wash it three times with 50ml methyl tert-butyl ether, and then wash it at a temperature of 80°C , vacuum-dried under the condition of 0.01MPa vacuum to obtain colorless liquid trimethylsulfonium trifluoromethanesulfonate with a yield of 87%.

[0078] Its hydrogen spectrum data are as follows:

[0079] 1 H NMR (CDCl 3 , 400MHz, ppm): 3.24(s, 9H)

[0080] Under inert atmosphere protection, take out 10g, trimethylsulfonium trifluoromethanesulfonate, then add the mixed solvent of 50g ethylene carbonate (EC), propylene carbonate (PC) and ethyl methyl carbonate (EMC) wherein, Among t...

Embodiment 2

[0082] Add 50g tetrahydrofuran, (62.1g, 1.0mol) dimethyl sulfide, (178.1g, 1.0mol) ethyl trifluoromethanesulfonate into a 500mL flask respectively, and raise the temperature to 10°C under a nitrogen atmosphere, and stir for 30 Hour. Stand to cool, carry out vacuum distillation at a temperature of 80°C and a pressure of 0.1Pa to remove excess reactants, collect the colorless liquid and wash it three times with 50ml of methyl tert-butyl ether, and then wash it at a temperature of 60°C , vacuum-dried under the condition of vacuum degree of 0.01MPa to obtain colorless liquid dimethylethylsulfonium trifluoromethanesulfonate with a yield of 88%.

[0083] Its hydrogen spectrum data are as follows:

[0084] 1 H NMR (CDCl 3 , 400MHz, ppm): 3.38(m, 2H), 3.25(s, 6H), 2.29(s, 3H).

[0085] Under the protection of an inert atmosphere, take out 10g of dimethyl ethyl sulfonium trifluoromethanesulfonate, then add 100g of ethylene carbonate (EC), propylene carbonate (PC) and ethyl methyl c...

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Abstract

The invention relates to a sulfur-containing ionic liquid. The chemical structural formula of the ionic liquid is shown as the specification, wherein R is alkyl of C1-C4; Y<-> is CF3SO3<-> or CF3CO2<->. The sulfur-containing ionic liquid is completely formed by ions at room temperature or under a situation close to the room temperature, has the advantages of high electrical conductivity, low melting point, wide electrochemical window, no volatilization or inflammability, good thermal stability and no halogen impurities or toxicity, and can be applied to the field of preparation of supercapacitors or lithium ionic batteries with high specific capacity. Furthermore, the invention also relates to a preparation method and application of the sulfur-containing ionic liquid.

Description

【Technical field】 [0001] The invention relates to the field of lithium-ion battery electrolyte, in particular to a sulfur-containing ionic liquid and a preparation method thereof, and also relates to an electrolyte using the sulfur-containing ionic liquid, a preparation method thereof, and a lithium-ion battery. 【Background technique】 [0002] Lithium-ion batteries have the advantages of high capacity, no memory effect, small size, light weight and no pollution. The volume of the lithium iron phosphate battery with the same specification and capacity is 2 / 3 of the volume of the lead-acid battery, and the weight is 1 / 3 of the lead-acid battery. Therefore, it is widely used in military fields, mobile communication devices, computers, and electric vehicles. The stored energy of the lithium-ion battery increases with the increase of the voltage, therefore, increasing the applied voltage can greatly increase the specific energy of the lithium-ion battery. [0003] However, the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C381/12C07C309/06C07C303/32C07C53/18C07C51/41H01M10/0566
CPCY02E60/10
Inventor 周明杰刘大喜袁新生王要兵
Owner OCEANS KING LIGHTING SCI&TECH CO LTD
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