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Ether group-containing imidazole polymeric ionic liquid as well as preparation method and application thereof

A technology of polymerizing ionic liquids and imidazoles, which is applied in the direction of hybrid capacitor electrolytes, etc., can solve problems such as low conductivity, inability to form close stacks of anions and cations, and large internal resistance

Active Publication Date: 2020-08-28
LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, ionic liquid electrolytes usually have high viscosity and high internal resistance, resulting in low conductivity, which affects the power performance of room temperature ionic liquid-based supercapacitors; at the same time, ionic liquids are extremely asymmetric due to the different sizes of anions and cations, resulting in the space between ions The hindrance makes it impossible for anions and cations to form a close stack on the microscopic level, which affects the performance of its electrochemical performance.

Method used

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  • Ether group-containing imidazole polymeric ionic liquid as well as preparation method and application thereof
  • Ether group-containing imidazole polymeric ionic liquid as well as preparation method and application thereof
  • Ether group-containing imidazole polymeric ionic liquid as well as preparation method and application thereof

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preparation example Construction

[0038] The invention provides a preparation method for the ether group-containing imidazole polymerized ionic liquid, comprising the following steps:

[0039] (1) Mix 1-vinyl-3-alkylimidazolium bromide, ethylene glycol vinyl ether, alcohol solvent and initiator, and carry out polymerization reaction under protective atmosphere to obtain ether group-containing copolymerized imidazolium bromide; the 1 - The alkyl group in the vinyl-3-alkylimidazolium bromide salt is a straight-chain alkyl group with 1 to 8 carbon atoms;

[0040] (2) The ether-containing copolymer imidazolium bromide and LiTFSI, KPF 6 or NaBF 4 Anion exchange reaction is carried out to obtain the ether group-containing imidazole polymerized ionic liquid.

[0041] The present invention mixes 1-vinyl-3-alkylimidazolium bromide (abbreviated as VIm-Br), ethylene glycol vinyl ether (abbreviated as VE), alcohol solvent and initiator, and carries out polymerization reaction under protective atmosphere to obtain Copol...

Embodiment 1

[0062] A kind of ether-based imidazole polymerized ionic liquid with the structure shown in formula I, the preparation method is:

[0063] (1) Add 3g of 1-vinyl-3-butylimidazolium bromide and 7g of ethylene glycol vinyl ether into a 100mL three-necked round-bottomed flask, add 100mL of ethanol and pass N 2 After 30 minutes, add 0.2g of azoisobutanedinitrile, and stir the polymerization reaction at 70°C for 6h; After watering for 3 times, transfer the mixed solution in the dialysis bag to a rotary evaporator to evaporate the solvent to dryness, and then dry it in vacuum at 80°C for 12 hours to obtain a pale yellow ether group-containing copolymer imidazolium bromide salt, which is recorded as PVBIm-0.7VE-Br, in the structural formula a / b=1:6, the mass fraction of imidazolium bromide unit is 0.304;

[0064] (2) Weigh 1g PVBIm-0.7VE-Br and dissolve it in 20mL distilled water, then add dropwise an aqueous solution containing 0.32g LiTFSI salt (the mass concentration of the aqueo...

Embodiment 2

[0066] A kind of ether-based imidazole polymerized ionic liquid with the structure shown in formula I, the preparation method is:

[0067] Weigh PVBIm-0.7VE-Br 1g obtained in Example 1 and dissolve in 20mL distilled water, then add dropwise 0.25gKPF 6 The aqueous salt solution was reacted at room temperature for 2 hours. During the reaction process, a white solid was gradually formed. The white solid was filtered with suction and washed repeatedly with 10 mL*5 times of distilled water, and vacuum-dried at 80°C to obtain an ether-based imidazole-based polymeric ionic liquid (the anion was PF 6 - ), denoted as PVBIm-0.7VE-PF 6 .

[0068] Carry out nuclear magnetic resonance to gained ether-based imidazoles polyionic liquid ( 1 HNMR) characterization, nuclear magnetic resonance spectrum as figure 1 As shown, it matches the expected structure.

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Abstract

The invention provides ether group-containing imidazole polymeric ionic liquid as well as a preparation method and application thereof, and relates to the technical field of supercapacitors. The ethergroup-containing imidazole polymeric ionic liquid provided by the invention has a structure as shown in a formula I, is added as an electrolyte additive, and can change the ion arrangement in the ionic liquid so as to improve the capacitance performance; meanwhile, the flexible side chain ether group in the structure can reduce the internal resistance of the ionic liquid electrolyte, so that theelectrochemical performance of the ionic liquid electrolyte is improved. The invention provides an ionic liquid electrolyte, which comprises an ionic liquid, an organic solvent and the ether group-containing imidazole polymeric ionic liquid, and can maintain or even increase the working window of a supercapacitor, improve the rate capability and the energy density of the supercapacitor and maintain the cycling stability of the supercapacitor. The invention also provides a preparation method of the ether group-containing imidazole polymeric ionic liquid, and the preparation method is simple inprocess, convenient to operate and easy for large-scale production.

Description

technical field [0001] The invention relates to the technical field of supercapacitors, in particular to an ether group-containing imidazole polymerized ionic liquid and a preparation method and application thereof. Background technique [0002] Ionic liquids are compounds formed by the complexation of asymmetric anions and cations, which have the advantages of high safety and high chemical stability, and have great development potential as electrolytes in the field of supercapacitors. However, ionic liquid electrolytes usually have high viscosity and high internal resistance, resulting in low conductivity, which affects the power performance of room temperature ionic liquid-based supercapacitors; at the same time, ionic liquids are extremely asymmetric due to the different sizes of anions and cations, resulting in the space between ions The hindrance makes it impossible for anions and cations to form a close stack on the microscopic scale, which affects the performance of i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F216/14C08F226/06C08F8/00C08F8/40C08F8/42H01G11/64
CPCC08F8/00C08F8/40C08F8/42C08F216/1416C08F2800/20C08F2810/50H01G11/64C08F226/06Y02E60/13
Inventor 阎兴斌汪妍郎俊伟冯建泽张旭
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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