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Self-healing composite polymer electrolyte and preparation thereof, and application thereof

A composite polymer and self-healing technology, applied in circuits, electrical components, secondary batteries, etc., can solve the problems of decreased conductivity and low ionic conductivity, and achieve improved mechanical properties, high electrochemical properties, and improved electrical properties. The effect of chemical properties

Inactive Publication Date: 2019-08-20
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the ionic conductivity of this polymer electrolyte system is relatively low, and the conductivity decreases with the increase of UPy units in the system

Method used

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  • Self-healing composite polymer electrolyte and preparation thereof, and application thereof
  • Self-healing composite polymer electrolyte and preparation thereof, and application thereof
  • Self-healing composite polymer electrolyte and preparation thereof, and application thereof

Examples

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preparation example Construction

[0043] The preparation method of the composite self-healing polymer electrolyte may include the following steps:

[0044] (1) 2-amino-4-hydroxy-6-methylpyrimidine and 1,6-hexamethylene diisocyanate are placed in a reactor, heated and stirred for reaction, and the reaction product is precipitated, washed and dried to obtain a UPy-NCO compound;

[0045] (2) Disperse tetraethyl orthosilicate in the first solvent, add ammonia water and deionized water, and vigorously stir the reaction at room temperature. The reaction product is centrifuged, washed, and dried to obtain white SiO 2 Nanoparticles;

[0046] (3) the SiO that described step (2) obtains 2 Nanoparticles are ultrasonically dispersed in the second solvent, 3-aminopropyltrimethoxysilane is added dropwise, and the reaction is refluxed at high temperature under the protection of argon. The reaction product is centrifuged, washed, and dried to obtain SiO 2 -NH 2 Nanoparticles;

[0047] (4) the UPy-NCO compound that describ...

Embodiment 1

[0057]Add 1.6g of 2-amino-4-hydroxy-6-methylpyrimidine to 2.15g of 1,6-hexamethylene diisocyanate, heat to 80°C to dissolve, react for 16 hours, and precipitate with n-hexane to obtain a white UPy-NCO compound. Mix 6.0g tetraethyl orthosilicate into 30mL ethanol, add 3mL ammonia water and 1.2mL deionized water, stir vigorously at 20°C for 12 hours, centrifuge, wash and dry to obtain silica with a particle size of 50nm Nanoparticles. Take 1.0 g of silica nanoparticles and ultrasonically disperse them in 30 mL of methanol, add 300 μL of 3-aminopropyltrimethoxysilane, heat up to 65 °C under the protection of nitrogen and reflux, react for 12 hours, centrifuge and dry to obtain SiO 2 -NH 2 Nanoparticles.

[0058] Take SiO 2 -NH 2 Dissolve 0.6g of nanoparticles and 0.2g of UPy-NCO compound in 100mL of tetrahydrofuran, add 0.03g of DBTDL catalyst, heat up to 70°C under nitrogen protection, react for 16 hours, centrifuge, wash, and dry to obtain SiO 2 - UPy nanoparticles. The p...

Embodiment 2

[0060] Add 2.2g of 2-amino-4-hydroxy-6-methylpyrimidine into 14.78g of 1,6-hexamethylene diisocyanate, heat to 100°C to dissolve, react for 20 hours, and precipitate through n-hexane to obtain a white UPy-NCO compound. Mix 6.0 g of tetraethyl orthosilicate into 60 mL of acetonitrile, add 6 mL of ammonia water and 3.6 mL of deionized water, stir vigorously for 18 hours, centrifuge, wash, and dry to obtain silica nanoparticles with a particle size of 150 nm. Take 1.0 g of silica nanoparticles and ultrasonically disperse them in 40 mL of ethanol, add 500 μL of 3-aminopropyltrimethoxysilane, heat up to 80 ° C under the protection of argon to reflux, react for 18 hours, centrifuge and dry to obtain SiO 2 -NH 2 Nanoparticles.

[0061] Take SiO 2 -NH 2 Dissolve 0.6g of nanoparticles and 0.6g of UPy-NCO compound in 100mL of dimethyl sulfoxide, add 0.1g of DBTDL catalyst, raise the temperature to 85°C under the protection of argon for 20 hours, centrifuge, wash and dry to obtain SiO...

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Abstract

The invention belongs to the technical field of polymer electrolytes and discloses a self-healing composite polymer electrolyte, preparation thereof, and application thereof. The polymer electrolyte is mainly formed by the composition of surface-functionalized nanoparticles and a self-healing polymer matrix with the mass ratio of 1 / 49 to 2 / 5. According to the invention, by improving the composition of key composite components in a composite polymer electrolyte, an overall corresponding microstructure of the composite and the design of the overall process flow of the preparation method, the self-healing composite polymer electrolyte with excellent performance can be obtained by using a supramolecular network constructed by UPy functionalized silica nanoparticles and the self-healing polymermatrix, compared with the prior art, the dispersion of the nanoparticles in the matrix is better, and the electrochemical performance, mechanical performance, self-healing efficiency of the composite polymer electrolyte can be effectively improved.

Description

technical field [0001] The invention belongs to the technical field of polymer electrolytes, and more specifically relates to a self-healing composite polymer electrolyte and its preparation and application. Background technique [0002] In 1991, Sony launched commercial lithium-ion batteries for the first time, which opened the prelude to the rapid development of lithium-ion batteries. For more than two decades, lithium-ion batteries have been widely used in portable electronic products such as smart watches, smartphones, and laptops due to their high energy density, low self-discharge rate, and no memory effect. However, currently commercial lithium-ion batteries mostly use liquid electrolytes, and their flammable, leaky, and explosive characteristics bring safety hazards to the use of lithium batteries, which limits the further use of lithium-ion batteries with liquid electrolytes. Solid polymer electrolytes can effectively solve the safety problems caused by liquid elec...

Claims

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Application Information

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IPC IPC(8): H01M10/0565
CPCH01M10/0565Y02E60/10
Inventor 何丹周炳华薛志刚周兴平解孝林
Owner HUAZHONG UNIV OF SCI & TECH
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