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Gel polymer electrolyte with blended cellulose and preparation method and application of gel polymer electrolyte

A technology of gel polymers and blended polymers, applied in circuits, electrical components, secondary batteries, etc., can solve the problems of insufficient mechanical strength and low ion conductivity, and achieve the best liquid absorption and liquid retention capacity , good biocompatibility and good electrochemical stability

Active Publication Date: 2018-01-09
SOUTH CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method is direct and effective, and the polymer battery has good chemical stability and cycle life, but there are still problems such as low ionic conductivity at room temperature and insufficient mechanical strength, so further research by researchers is urgently needed

Method used

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  • Gel polymer electrolyte with blended cellulose and preparation method and application of gel polymer electrolyte
  • Gel polymer electrolyte with blended cellulose and preparation method and application of gel polymer electrolyte
  • Gel polymer electrolyte with blended cellulose and preparation method and application of gel polymer electrolyte

Examples

Experimental program
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Effect test

Embodiment 1

[0037] (1) The temperature of the oil bath was kept at 30°C, and P(VdF-HFP) and CAP with a mass ratio of 1:1 were added to a three-necked flask filled with acetone, and mechanically stirred continuously for one hour to fully dissolve it to obtain a mass fraction of 12. % gel polymer solution, wherein the stirring speed is 250r / min, that is, the blended polymer solution.

[0038] (2) Pour the blended polymer solution obtained in step (1) into a beaker, then immerse the non-woven fabric in the above blended polymer solution, pull it up quickly after soaking for a few seconds, and volatilize the solvent in the air for 1 hour Then transfer to a vacuum oven at 60° C. for 12 hours to obtain a gel polymer separator of blended cellulose. The thickness of this film is 45-50 micrometers.

[0039] (3) Cut the gel polymer diaphragm prepared in step (2) into a circular size with a diameter of 18mm, and in the glove box, drop electrolyte (1mol / L LiPF 6 +EC+EMC+DEC, the mass ratio of EC:EM...

Embodiment 2

[0042] (1) The temperature of the oil bath was kept at 30°C. P(VdF-HFP) and CAP with a mass ratio of 2:1 were added to a three-necked flask filled with acetone, and mechanically stirred continuously for one hour to fully dissolve it to obtain a mass fraction of 12. % gel polymer solution, wherein the stirring speed is 250r / min, that is, the blended polymer solution.

[0043] (2) Pour the blended polymer solution obtained in step (1) into a beaker, then immerse the non-woven fabric in the above blended polymer solution, pull it up quickly after soaking for a few seconds, and volatilize the solvent in the air for 1 hour Then transfer to a vacuum oven at 60° C. for 12 hours to obtain a gel polymer separator of blended cellulose. The thickness of this film is 45-50 micrometers.

[0044] (3) Process according to step (3) of Example 1.

[0045] (4) Process according to step (4) of Example 1.

Embodiment 3

[0047] (1) The temperature of the oil bath was kept at 30°C, and P(VdF-HFP) and CAP with a mass ratio of 3:1 were added to a three-necked flask filled with acetone, and mechanically stirred continuously for one hour to fully dissolve it to obtain a mass fraction of 12. % gel polymer solution, wherein the stirring speed is 250r / min, that is, the blended polymer solution.

[0048] (2) Pour the blended polymer solution obtained in step (1) into a beaker, then immerse the non-woven fabric in the above blended polymer solution, pull it up quickly after soaking for a few seconds, and volatilize the solvent in the air for 1 hour Then transfer to a vacuum oven at 60° C. for 12 hours to obtain a gel polymer separator of blended cellulose. The thickness of this film is 45-50 micrometers.

[0049] (3) Process according to step (3) of Example 1.

[0050] (4) Process according to step (4) of Example 1.

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Abstract

The invention discloses a gel polymer electrolyte with blended cellulose and a preparation method and application of the gel polymer electrolyte and belongs to the field of lithium-ion batteries. Themethod comprises the following steps of dissolving poly(vinylidene fluoride-hexafluoropropylene) and cellulose acetate phthalate into acetone and stirring until a polymer is completely dissolved and forms a colorless transparent gel solution, namely a blended polymer solution; immersing a blank non-woven fabric into the blended polymer solution, quickly pulling up the blank non-woven fabric aftera few seconds, drying in the air and then drying in vacuum; preparing a porous gel polymer membrane with the blended cellulose; and dropwise adding an electrolyte solution on the upper and lower surfaces of the gel polymer membrane to obtain the gel polymer electrolyte with the blended cellulose when the battery is assembled. The gel polymer electrolyte is simple in preparation technology, short in time, high in production efficiency, high in mechanical strength and excellent in cycling stability, and the obtained polymer membrane has excellent absorption performance and liquid holding capacity, and has good ionic conductivity and interface stability.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and in particular relates to a gel polymer electrolyte blended with cellulose and a preparation method and application thereof. Background technique [0002] Since the concept of lead-acid battery was put forward, secondary batteries aiming at high specific energy, long life and safety have successively experienced lead-acid battery, nickel-chromium battery and nickel-hydrogen battery. Li-ion battery stage. Among all energy storage batteries, lithium-ion batteries have the advantages of high energy density, long cycle life, small self-discharge, no memory effect, and environmental friendliness. Therefore, they are widely used in electronic products, power vehicles and other fields. The best performance of the new green secondary battery. However, most commercial lithium-ion batteries currently use liquid organic electrolytes. Due to the flash point, low vapor pressure, and strong fluidity o...

Claims

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Application Information

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IPC IPC(8): H01M10/0565H01M10/0525
CPCY02E60/10
Inventor 廖友好陈芳彬李伟善
Owner SOUTH CHINA NORMAL UNIVERSITY
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