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Preparation method for modified graphene oxide-doped solid polymer electrolyte

A solid polymer and graphene technology, applied in circuits, electrical components, secondary batteries, etc., can solve the problems of battery production, transportation and use safety hazards, batteries are easy to catch fire, burn or even explode, and restrict popularization and application. The generation of dendrites, the improvement of chain movement ability, and the effect of improving ion conductivity

Inactive Publication Date: 2017-05-17
QILU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the electrolytes used in lithium-ion batteries contain organic solvents with low flash point and low ignition point, which are flammable and explosive. The battery is extremely easy to catch fire or even explode under extreme conditions such as short circuit, overcharge, heat, and violent impact, thus It has brought safety hazards to the production, transportation and use of lithium-ion batteries, and has seriously restricted its promotion and application in certain fields, especially in the field of electric vehicles.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0019] (1) Add 0.1g of graphene oxide to 20ml of N,N-dimethylformamide, and disperse it ultrasonically for 30 minutes to form a uniformly dispersed mixed solution of graphene oxide. Measure 10ml of thionyl chloride and add it to the prepared oxide In the graphene mixed solution, react at 70°C for 24 hours under mechanical stirring, then centrifuge, wash and dry;

[0020] (2) Add the sample obtained in step (1) and 2g of polyethylene glycol into 20ml of dimethyl sulfoxide solution, react at 50°C under nitrogen atmosphere for 72 hours, then centrifuge, wash and dry;

[0021] (3) Mix 2.7g of polyethylene oxide and 0.3g of polyvinyl alcohol in the aqueous solution, and stir mechanically at 40°C for 6 hours;

[0022] (4) Add 0.15g of the sample obtained in step (2) to the mixed solution in step (3), stir for 4 hours, then add 0.3g of lithium perchlorate, continue stirring for 5 hours at room temperature, then pour the mixed solution Put it into a polytetrafluoroethylene mold, dry ...

Embodiment approach 2

[0024] Add 0.3g of graphene oxide to 40ml of N,N-dimethylformamide, ultrasonically disperse for 30 minutes to form a uniformly dispersed graphene oxide mixed solution, measure 10ml of thionyl chloride and add it to the prepared graphene oxide to mix In the solution, react at 70°C for 24 hours under mechanical stirring, then centrifuge, wash and dry;

[0025] (2) Add the sample obtained in step (1) and 6g of polyethylene glycol into 20ml of dimethyl sulfoxide solution, react at 50°C under a nitrogen atmosphere for 72 hours, then centrifuge, wash, and dry;

[0026] (3) Mix 2.4g of polyethylene oxide and 0.6g of polyvinyl alcohol in the aqueous solution and stir mechanically at 40°C for 6 hours;

[0027] (4) Add 0.3g of the sample obtained in step (2) to the mixed solution in step (3), stir for 4 hours, then add 0.3g of lithium perchlorate, continue stirring for 5 hours at room temperature, then pour the mixed solution Put it into a polytetrafluoroethylene mold, dry it in a fume...

Embodiment approach 3

[0029] (Add 0.2g graphene oxide to 30ml N, N-dimethylformamide, ultrasonically disperse for 30 minutes to form a uniformly dispersed graphene oxide mixed solution, measure 10ml thionyl chloride and add it to the prepared graphene oxide In the mixed solution, react at 70°C for 24 hours under mechanical stirring, then centrifuge, wash and dry;

[0030] (2) Add the sample obtained in step (1) and 4g of polyethylene glycol into 20ml of dimethyl sulfoxide solution, react at 50°C under nitrogen atmosphere for 72 hours, then centrifuge, wash and dry;

[0031] (3) Mix 2.1g of polyethylene oxide and 0.9g of polyvinyl alcohol in the aqueous solution, and stir mechanically at 40°C for 6 hours;

[0032] (4) Add 0.45g sample obtained in step (2) to the mixed solution in step (3), stir for 4 hours, then add 0.45g lithium perchlorate, continue stirring for 5 hours at room temperature, then pour the mixed solution Put it into a polytetrafluoroethylene mold, dry it in a fume hood for 12 hours...

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Abstract

The invention discloses a preparation method for a modified graphene oxide-doped solid polymer electrolyte. The preparation method specifically comprises the steps of doping the prepared modified graphene oxide into a mixed solution of polyoxyethylene and polyvinyl alcohol, then adding a perchloric acid lithium salt, performing a solution casting method, pouring the mixed solution into a polytetrafluoroethylene die, and drying the solvent at a normal temperature and in a vacuum drying oven to obtain a polymer electrolyte film. The prepared polymer electrolyte, due to the existence of ether oxygen bonds on the modified graphene oxide, can promote dissociation of the lithium salt and improve ionic conductivity of the polymer electrolyte; meanwhile, the crystalline region of polyoxyethylene can be suppressed by polyvinyl alcohol while the mechanical strength and ionic conductivity of the polymer electrolyte can be strengthened; and the prepared polymer electrolyte has relatively high ionic conductivity, relatively high mechanical strength and high safety performance.

Description

technical field [0001] The invention belongs to the technical field of batteries, in particular to the preparation of solid polymer electrolytes for lithium ion batteries. Background technique [0002] Due to the advantages of high energy density, large specific capacity, and light weight, lithium-ion batteries are widely used in mobile communications such as mobile phones, laptop computers, cameras, game consoles, power tools and power vehicles. These applications accompany people's lives all the time, so The safety performance of batteries has received more and more attention, and has gradually become an important standard for people to investigate battery performance. In addition, the electrolytes used in lithium-ion batteries contain organic solvents with low flash point and low ignition point, which are flammable and explosive. The battery is extremely easy to catch fire or even explode under extreme conditions such as short circuit, overcharge, heat, and violent impact...

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 刘伟良陈立宁刘波杨婷婷任慢慢
Owner QILU UNIV OF TECH
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