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Ionic liquid polymer electrolyte and preparation method thereof

An ionic liquid and polymer technology, which is applied in the manufacture of electrolyte batteries, non-aqueous electrolyte batteries, circuits, etc., can solve the problems of high room temperature conductivity, wide electrochemical window, and low room temperature conductivity, which limit practical use, and achieve high conductivity. efficiency, simple preparation method

Inactive Publication Date: 2015-03-25
UNIVERSITY OF CHINESE ACADEMY OF SCIENCES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because ionic liquids are liquid at room temperature, and have the characteristics of low viscosity, non-volatile, non-combustible, low toxicity, high room temperature conductivity, and wide electrochemical window, ionic liquids are suitable as electrolytes for batteries, and ionic liquids are suitable for lithium batteries as electrolytes. The safety of ion batteries is higher than that of organic electrolyte batteries, but ionic liquid lithium-ion batteries cannot meet the development direction of batteries towards lightweight, thin film and arbitrary shape
Although the current polymer electrolyte battery can meet the development direction of the battery, its low room temperature conductivity limits its practical application.

Method used

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  • Ionic liquid polymer electrolyte and preparation method thereof
  • Ionic liquid polymer electrolyte and preparation method thereof
  • Ionic liquid polymer electrolyte and preparation method thereof

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Embodiment 1

[0034] In this embodiment, the polymerization reaction used is anionic polymerization. After baking the constant pressure funnel, spherical condenser, distillation device and 100ml three-neck flask in an oven for 3 hours, add 0.12g (1mmol) trimethylolpropane to it, remove oxygen and nitrogen, repeat three times, add 0.55ml Water, methanol and 0.45ml potassium methoxide solution were stirred and reacted for 0.5 hours to distill off the methanol. Raise the temperature to 90°C, then add 12ml glycidol dropwise within 12h, then continue heating and stirring for 12h, add a certain amount of methanol and then evaporate to dryness, put it in a vacuum oven at 45°C for 12h. This was obtained as a clear, viscous, colorless liquid. According to elemental analysis: C49.00%, H8.51%, 042.49%. The number average molecular weight measured by GPC was 1719, and the molecular weight distribution was 1.37. Each hyperbranched molecule contains 24 hydroxyl molecules.

Embodiment 2

[0036] Add 10g of hyperbranched polyglycidol (HPG) in Example 1 to a 500ml dry single-necked bottle equipped with a magnet, add 300ml of thionyl chloride, under nitrogen protection, heat and reflux at 80°C for 24h, then distill out unreacted under reduced pressure Thionyl chloride was dried in a vacuum oven for 24 hours to obtain a yellow viscous liquid. 1 H NMR calculations showed that the hydroxyl groups were all chlorinated.

Embodiment 3

[0038] Add the chlorinated hyperbranched polyglycidol (HPG-C1) that 5g embodiment 2 prepares in the 250ml two-necked flask that magnetron is housed, add 20mlN, N-dimethylformamide, cool in ice-water bath, under nitrogen condition Slowly add N-methylimidazole ([MmIm] / [C1]=1.5:1), then stir and heat for 8 hours, cool to room temperature, steam out N,N-dimethylformamide under pressure, and use appropriate amount of acetone The crude product was washed twice, filtered, and dried in vacuo to obtain yellow polymer [HPG-MeIm]Cl with low viscosity. The glass transition temperature was -18°C as measured by DSC, and the initial decomposition temperature was 169°C as measured by TGA.

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Abstract

The invention discloses an ionic liquid polymer electrolyte and a preparation method thereof. An ionic liquid polymer is synthesized through using a polymer chemical functionalization process, and the structure of the ionic liquid polymer is represented by formula (1) shown in the specification. The ionic liquid polymer is formed through connecting N-methylimidazole with a polymer by chemical bonds, wherein the polymer can be a linear polymer and a hyperbranched polymer, the linear polymer is polyethylene oxide and polyepoxy chloropropane preferably, and the hyperbranched polymer is hyperbranched polyether preferably; and anion a can be halogen, tetrafluoroborate, hexafluorophosphate and ditrifluoromethyl sulfimide, and N-methylimidazole in the formula (1) can be substituted by a pyridine ring, tributyl amine and a pyrrole ring. The ionic liquid polymer electrolyte is composed of the ionic liquid polymer and a lithium salt, and contains no volatile solvents, and the conductivity at room temperature of the ionic liquid polymer electrolyte can reach 3.5*10<-4>Scm<-1>. The polymer electrolyte can be used in lithium ion secondary batteries, electrochromic devices, supercapacitors and other electrochemical devices.

Description

technical field [0001] The invention belongs to the field of polymer electrolyte materials, in particular to an ionic liquid polymer electrolyte and a preparation method thereof. Background technique [0002] Lithium batteries are one of the products of people looking for alternatives to fossil energy in the 1960s and 1970s. Compared with traditional batteries, lithium batteries have the characteristics of high working voltage, high energy density, wide working temperature range, long storage time and stable discharge, so they are widely used in communication, transportation, military and household appliances and other fields. However, at present, lithium-ion batteries usually use organic liquids as electrolytes, which are prone to leakage and explosion during use, seriously affecting the service life and safety of the batteries. Polymer electrolytes are composed of polymers and lithium salts. Compared with traditional lithium-ion batteries, polymer lithium-ion batteries ha...

Claims

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Application Information

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IPC IPC(8): H01M10/0565
CPCH01M10/0567H01M10/058Y02E60/10
Inventor 张辽云郑涛李化毅周倩任士通胡友良
Owner UNIVERSITY OF CHINESE ACADEMY OF SCIENCES
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