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Preparation method of porous fiber gel polymer electrolyte

A gel polymer, porous fiber technology, applied in the direction of organic electrolytes, non-aqueous electrolytes, circuits, etc., to overcome the low adsorption rate, improve mechanical properties, and good application prospects.

Inactive Publication Date: 2015-09-09
JIANGSU UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Blending is a relatively simple and widely used modification method, which is to physically mix two or more polymers to improve the performance defects of a single material

Method used

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  • Preparation method of porous fiber gel polymer electrolyte
  • Preparation method of porous fiber gel polymer electrolyte
  • Preparation method of porous fiber gel polymer electrolyte

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A kind of preparation method of porous fiber gel polymer electrolyte, concrete steps are:

[0025] 1. Mix polyethylene glycol with an average molecular weight of 8000 and toluene diisocyanate in a tetrahydrofuran solvent at a molar ratio of 1:2.2. The solution concentration of the mixture is controlled at 1 g / ml, and the temperature is raised to 90°C for 24 hours of condensation reaction. Then add lithium hydroxide in an equimolar amount to polyethylene glycol to the reaction system at a temperature of 65°C, neutralize the reaction for 2 hours, and then heat in an oven at 90°C for 12 hours to volatilize the solvent to obtain an ionic polymer, namely polyamino Lithium polyethylene glycol formate;

[0026] 2. Combine the obtained poly(ethylene glycol) polycarbamate lithium with a molecular weight of 1×10 5 The polyvinylidene fluoride was mixed and dispersed in the N,N-dimethylformamide solution according to the mass ratio of 1:4. The concentration of the mixture solution...

Embodiment 2

[0029] A kind of preparation method of porous fiber gel polymer electrolyte, concrete steps are:

[0030] 1. Mix polyethylene glycol with an average molecular weight of 5000 and toluene diisocyanate in a tetrahydrofuran solvent at a molar ratio of 1:2.1. The solution concentration of the mixture is controlled at 3g / ml, and the temperature is raised to 70°C for 18 hours of condensation reaction. Then add lithium hydroxide in an equimolar amount to polyethylene glycol to the reaction system at a temperature of 70°C, neutralize for 1.5 hours, and then heat in an oven at 80°C for 8 hours to volatilize the solvent to obtain an ionic polymer, namely polyamino Lithium polyethylene glycol formate;

[0031] 2. Combine the obtained poly(ethylene glycol) polycarbamate lithium with a molecular weight of 4×10 5 The polyvinylidene fluoride was mixed and dispersed in the N,N-dimethylformamide solution according to the mass ratio of 1:2. The concentration of the mixture solution was controll...

Embodiment 3

[0034] A kind of preparation method of porous fiber gel polymer electrolyte, concrete steps are:

[0035]1. Mix polyethylene glycol with an average molecular weight of 1000 and toluene diisocyanate in a tetrahydrofuran solvent at a molar ratio of 1:2. The solution concentration of the mixture is controlled at 5g / ml, and the temperature is raised to 50°C for 12 hours of condensation reaction. Then add lithium hydroxide in an equimolar amount to polyethylene glycol to the reaction system at a temperature of 75°C, neutralize for 1 hour, and then heat in an oven at 70°C for 6 hours to volatilize the solvent to obtain an ionic polymer, namely polyamino Lithium polyethylene glycol formate;

[0036] 2. Combine the obtained poly(ethylene glycol) polycarbamate lithium with a molecular weight of 5×10 5 The polyvinylidene fluoride was mixed and dispersed in the N,N-dimethylformamide solution according to the mass ratio of 1:1. The concentration of the mixture solution was controlled at ...

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Abstract

The invention discloses a preparation method of a porous fiber gel polymer electrolyte. According to the preparation method, firstly, ionic polymer polyurethane polyglycol ester lithium is prepared via condensation polymerization, and then is mixed with polyvinylidene fluoride at a mass ratio of 1:1-1:4; an obtained mixture is dispersed into a N,N-dimethylformamide solution; an obtained mixed material is subjected to electrostatic spinning and drying so as to prepare blended polymer porous fiber membranes; the blended polymer porous fiber membranes are dried, and a liquid electrolyte is absorbed by the blended polymer porous fiber membranes for activation so as to obtain the porous fiber gel polymer electrolyte with a thickness of 50 to 70<mu>m, wherein the mass of the liquid electrolyte absorbed by the blended polymer porous fiber membranes accounts for 200 to 400wt% of that of the blended polymer porous fiber membranes. The optimal ionic conductivity of the porous fiber gel polymer electrolyte is 5.43*10<-3>S / cm, electrochemical stability window is about 5.0V, and application prospect in the field of polymer lithium ion battery is promising.

Description

technical field [0001] The invention relates to a gel polymer electrolyte, in particular to a method for preparing a porous fiber gel polymer electrolyte applied to a polymer lithium ion battery. Background technique [0002] Compared with traditional liquid electrolytes, gel polymer electrolytes have high safety performance and excellent electrochemical performance, which is conducive to large-scale commercial production. At present, it is widely used in various new lithium-ion batteries, supercapacitors and fuel cells. As an important matrix material for polymer electrolytes, polyethylene oxide, polyvinylidene fluoride, polyacrylonitrile, polyvinylpyrrolidone, and polyurethane have been studied more. Among them, due to the existence of fluorine atoms on the main chain, polyvinylidene fluoride not only has a high dielectric constant (ε=8.4) to facilitate the dissociation of lithium salts, but also has excellent electrochemical stability and high temperature resistance. It...

Claims

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Application Information

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IPC IPC(8): H01M10/0565
CPCH01M10/0565H01M2300/0025Y02E60/10
Inventor 李为立黄东王军朱正宝吴雨慧杨刚
Owner JIANGSU UNIV OF SCI & TECH
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