Preparation method for ionic liquid electrolyte

An ionic liquid and electrolyte technology, applied in circuits, electrical components, secondary batteries, etc., can solve the problems affecting the stability and safety of lithium ion batteries, the complex preparation process of lithium hexafluorophosphate, and the harsh process conditions, and achieve effective separation. , the effect of lowering the freezing point and reducing production costs

Inactive Publication Date: 2013-12-18
NANJING FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Lithium hexafluorophosphate has problems such as complicated preparation process, harsh process conditions, and high price, especially poor thermal stability and poor water resistance.
When lithium hexafluorophosphate encounters water or water vapor, it will rapidly decompose and generate phosphorus pentafluoride. Phosphorus pentafluoride is a colorless and foul-smelling gas at normal temperature and pressure, which is strongly irritating to the skin, eyes and mucous membranes. Water will react violently to generate highly toxic and corrosive hydrogen fluoride, which seriously affects the stability and safety of lithium-ion batteries

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Lithium trifluoroacetate: 8%

[0029] Vinyl carbonate: 40%

[0030] Ethyl propylene carbonate: 15%

[0031] 1-Methyl-3-ethylimidazolium hexafluorophosphate: 15%

[0032] N-hexylpyridine tetrafluoroborate: 5%

[0033] 12-Crown-4: 15%

[0034] Poly(n-tetradecyl methacrylate): 0.3%

[0035] n-octyl polyacrylate: 0.2%

[0036] Decabromodiphenyl ether: 1.5%

[0037] Preparation process: According to the above mass percentage, lithium trifluoroacetate, ethylene carbonate, ethyl propylene carbonate, 1-methyl-3-ethylimidazolium hexafluorophosphate, N-hexylpyridine tetrafluoroborate, 12 -Crown-4, polytetradecyl methacrylate, n-octyl polyacrylate and decabromodiphenyl ether are mixed, stirred until all materials are completely dissolved, and the ionic liquid electrolyte is obtained.

Embodiment 2

[0039] Lithium triflate: 10%

[0040] Propylene carbonate: 31%

[0041] Butylene carbonate: 26%

[0042] 1-Methyl-3-ethylimidazolium tetrafluoroborate: 12%

[0043] N-hexylpyridine hexafluorophosphate: 7%

[0044] Benzo-12-crown-4: 12%

[0045] Poly(n-lauryl methacrylate): 0.2%

[0046] Poly(n-lauryl acrylate): 0.1%

[0047] Pentabromotoluene: 1.7%

[0048] Preparation process: According to the above mass percentage, lithium trifluoromethanesulfonate, propylene carbonate, butylene carbonate, 1-methyl-3-ethylimidazolium tetrafluoroborate, N-hexylpyridine hexafluorophosphate, Benzo-12-crown-4, poly-n-dodecyl methacrylate, poly-n-dodecyl acrylate and pentabromotoluene are mixed, stirred until all materials are completely dissolved, and the ionic liquid electrolyte is obtained.

Embodiment 3

[0050] Lithium trifluoroacetate: 11%

[0051] Butylene carbonate: 50%

[0052] 1-Methyl-3-butylimidazolium hexafluorophosphate: 6%

[0053] N-butylpyridine tetrafluoroborate: 13%

[0054] 2-Hydroxymethyl-12-crown-4: 18%

[0055] Poly-n-octyl methacrylate: 0.2%

[0056] n-tetradecyl polyacrylate: 0.2%

[0057] Hexabromocyclododecane: 1.6%

[0058] Preparation process: According to the above mass percentage, lithium trifluoroacetate, butylene carbonate, 1-methyl-3-butylimidazole hexafluorophosphate, N-butylpyridine tetrafluoroborate, 2-hydroxymethyl -12-crown-4, poly-n-octyl methacrylate, poly-n-tetradecyl acrylate and hexabromocyclododecane are mixed, stirred until all materials are completely dissolved, and the ionic liquid electrolyte is obtained.

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PUM

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Abstract

The present invention discloses a preparation method for an ionic liquid electrolyte. According to the method, a lithium salt, a carbonate, ionic liquid, 12-crown-4 and a 12-crown-4 derivative, a polymethacrylic acid long chain alkyl ester, a polyacrylic acid long chain alkyl ester and a fire retardant agent are adopted as raw materials. The preparation method comprises: mixing the raw materials according to a certain ratio, wherein the raw materials comprise, by mass, 0.001-95% of the lithium salt, 0.001-95% of the carbonate, 0.001-95% of the ionic liquid, 0.001-95% of the 12-crown-4 and the 12-crown-4 derivative, 0.001-15% of the polymethacrylic acid long chain alkyl ester, 0.001-15% of the polyacrylic acid long chain alkyl ester and 0.001-15% of the fire retardant agent; carrying out stirring until all the materials are completely dissolved to obtain the ionic liquid electrolyte.

Description

technical field [0001] The invention relates to a preparation method of an ionic liquid electrolyte, belonging to the field of lithium ion battery materials. Background technique [0002] Lithium-ion batteries have the advantages of high working voltage, high energy density, wide application temperature range, low self-discharge rate, long cycle life, and no memory effect. With the aggravation of the world's energy crisis and environmental crisis, lithium-ion batteries have significant advantages compared with traditional batteries and have attracted widespread attention from all over the world. They are known as one of the green energy sources in the 21st century, which makes lithium-ion batteries rapidly It has developed into a huge industry and occupies an important position and role in the global economy. [0003] At present, lithium-ion batteries have been widely used in pocket household appliances such as portable computers and mobile phones, and have also been widely...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0567H01M10/0568
CPCY02E60/12Y02E60/10
Inventor 刘福生
Owner NANJING FORESTRY UNIV
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