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Ionic gel polymer electrolyte with damage repairing capability, preparation method and application of ionic gel polymer electrolyte

An ion gel, a technology for repairing damage, applied to circuits, electrical components, secondary batteries, etc., can solve problems such as battery failure, short-circuit safety, accidents, etc., and achieve high safety, good processing performance, and good conductivity.

Active Publication Date: 2018-09-14
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

All of the above works apply self-healing materials to the electrodes of lithium-ion batteries, which effectively improves the service life and reliability of the batteries. However, there is no report on the research on self-healing electrolyte materials, although the damage of the electrolyte will directly cause battery life. The failure or even a short circuit may cause serious safety accidents

Method used

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  • Ionic gel polymer electrolyte with damage repairing capability, preparation method and application of ionic gel polymer electrolyte
  • Ionic gel polymer electrolyte with damage repairing capability, preparation method and application of ionic gel polymer electrolyte
  • Ionic gel polymer electrolyte with damage repairing capability, preparation method and application of ionic gel polymer electrolyte

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Preparation of an ionogel electrolyte membrane based on quadruple hydrogen bond UPy crosslinking, and testing of repair performance and battery performance:

[0028] Preparation of ionic liquid monomer 1-[1-(3-chloropropyl)-2-ureido-4[1H]pyrimidinone]-3-vinylimidazolium chloride salt (IL-UPy) The above-mentioned monomer A): using 1-vinylimidazole and 1-(3-chloropropyl)-2-ureido-4[1H]pyrimidinone (abbreviated as: 3-chloropropyl-UPy) through quaternary ammonium produced by chemical reaction. The details are as follows: 1-vinylimidazole (4.71g, 0.050mol), 3-chloropropyl-UPy (2.45g, 0.010mol) and DMF (6mL) were added to a 100mL round bottom flask, refluxed at 80°C Reaction 72h. Then, the reactant was added dropwise to diethyl ether, the product was precipitated, and excess 1-vinylimidazole and solvent DMF were removed, washed with diethyl ether several times, and the obtained crude product was vacuum-dried at 60°C for 24h, and then again Soluble in water. The solution w...

Embodiment 2

[0035] Test of repair performance of self-healing ion gel electrolyte in battery: assembly and performance test of lithium battery: including weighing LiFePO 4 (8.0mg), 1.0mg acetylene black and PVDF (1.0mg), and add N-methylpyrrolidone (17mg), stir well to get a well-mixed slurry; then scrape it on a clean aluminum foil , dried to a constant weight at 80 °C under a vacuum of 0.015 MPa, and rolled into LiFePO under a pressure of 10 MPa. 4 electrode, and cut into a positive electrode disc, and the lithium sheet was used as the negative electrode. The ion gel electrolyte in the embodiment (1) is cut open, the cut surfaces are contacted, and assembled into LiFePO 4 / Li button battery, and then place the battery at 55°C, let the damaged ion gel electrolyte layer repair for 1h, disassemble the battery and find that the gel electrolyte has been well repaired, as Figure 4 as shown in a. At a rate of 0.2C (voltage range 2.5-4V), the charge-discharge cycle test was performed on the...

Embodiment 3

[0037] Preparation of 1-(5-pentanamide)-3-vinylimidazolium chloride salt (IL-Am) ionic liquid monomer: it is prepared by quaternization reaction using 1-vinylimidazole and 5-chloropentanamide. The details are as follows: 1-vinylimidazole (5.64g, 0.060mol), 5-chloropentanamide (4.07g, 0.030mol) and DMF (6mL) were added into a round bottom flask, condensed and refluxed at 85°C for 48h. Then, the reactant was added dropwise to diethyl ether to precipitate the product, and the excess 1-vinylimidazole and solvent DMF were removed, washed several times with diethyl ether, and then washed with acetone, and the obtained crude product was vacuum-treated at 60°C. Dry for 24h, then dissolve in water again. The solution was filtered and the filtrate was collected (to remove excess 3-chloropropyl-UPy), and the filtrate was further lyophilized to obtain the final product.

[0038] The preparation of 1-(2-ethyl ether)-3-vinylimidazolium bromide (IL-Ether) ionic liquid monomer: first, 2-brom...

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Abstract

The invention discloses an ionic gel polymer electrolyte with damage repairing capability, a preparation method and an application of the ionic gel polymer electrolyte to a lithium ion battery, and belongs to the technical field of lithium ion battery polymer electrolytes. According to the electrolyte, polyion liquid materials can form reversible interaction crosslinking and serve as a framework,and the polyion liquid materials, ionic liquid and lithium salt are mixed and hot pressed to form the ionic gel electrolyte. The ionic gel electrolyte has high electrical conductivity, non-inflammability and good mechanical property, an ionic gel electrolyte diaphragm is acquired in a reversible interaction crosslinking manner and can repair damage at a certain temperature, accidents such as shortcircuit of the lithium ion battery caused by damage of an electrolyte layer is effectively prevented, safety and reliability of the lithium ion battery are improved, the service life of the lithium ion battery is prolonged, and the ionic gel electrolyte is expected to replace traditional organic electrolyte liquid and serves as new-generation electrolyte materials to be widely applied to lithiumion batteries.

Description

technical field [0001] The invention belongs to the technical field of lithium ion battery polymer electrolytes, and in particular relates to an ion gel polymer electrolyte capable of repairing damage, a preparation method and its application as an electrolyte in lithium ion batteries. Background technique [0002] Lithium-ion batteries have been widely used in various electronic devices and electric vehicles. How to construct lithium-ion batteries with high energy density, high safety and reliability, and excellent cycle stability is still a major problem that researchers need to overcome. problem (Nature 2001, 414, 359–367). Generally, lithium-ion batteries are mainly composed of positive and negative electrode layers and an intermediate electrolyte layer. Among them, the electrolyte layer is the main component of lithium-ion batteries. Currently, the most widely used electrolyte material is obtained by soaking the separator in organic electrolyte. However, this type of e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0565
CPCH01M10/0565Y02E60/10
Inventor 孙俊奇郭盼龙李洋刘小孔李健魏英进苏安宇
Owner JILIN UNIV
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