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Single-ion-conductor polymer electrolyte composite diaphragm as well as preparation method and application thereof

A conductor polymer and composite membrane technology, applied in batteries, circuits, electrospinning, etc., can solve the problems of weak film mechanical strength, low battery rate and cycle performance, to overcome poor mechanical properties, improve cycle performance, The effect of increasing the battery rate

Inactive Publication Date: 2021-03-12
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, further studies have shown that the mechanical strength of the above solution is relatively weak during the preparation of the polymer electrolyte film and the use of the battery, and it cannot be charged and discharged at room temperature, and its battery rate and cycle performance at 60 ° C are also poor. relatively low

Method used

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  • Single-ion-conductor polymer electrolyte composite diaphragm as well as preparation method and application thereof
  • Single-ion-conductor polymer electrolyte composite diaphragm as well as preparation method and application thereof
  • Single-ion-conductor polymer electrolyte composite diaphragm as well as preparation method and application thereof

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preparation example Construction

[0036] A method for preparing a single-ion conductor polymer electrolyte composite diaphragm provided by the invention comprises the following steps:

[0037] Mix and disperse the single-ion conductor polymer electrolyte and the polymer matrix in a solvent to form a spinning solution, and use an electrospinning process to prepare a single-ion conductor polymer electrolyte composite membrane;

[0038] Wherein, the single ion conductor polymer electrolyte has a structural formula as shown in formula (1):

[0039]

[0040]In formula (1), x, y, z and n all take natural numbers, and x:y=100:10~10:100, x:z=100:10~10:100, n=3~20; The polymer matrix contains one or more elements of N, O and F.

[0041] The single-ion conductor polymer electrolyte of the present invention is composed of lithium styryl bissulfonylimide, UPyMA containing quadruple hydrogen bonds and polyethylene glycol monomethyl ether methacrylate through reversible addition - Obtained by fragmentation chain transf...

Embodiment 1

[0092] (1) Add 30mL of N,N-dimethylformamide into a 100mL two-neck round bottom flask, stir at 0°C for more than 30 minutes, then drop 25mL of thionyl chloride into N,N-dimethylformamide through a constant pressure dropping funnel. in methylformamide solution. Mechanical stirring was performed at 0°C under an inert atmosphere, and 0.05 mol of p-styrene sodium sulfonate solid powder was slowly added to the above solution. After the sodium p-styrenesulfonate was completely dissolved, it was stirred at 0°C under an inert atmosphere for 2 hours, then at room temperature under an inert atmosphere for 6 hours, and the obtained reaction solution was placed in a refrigerator at 4°C overnight. The reaction solution was dissolved in deionized water, extracted with dichloromethane, anhydrous MgSO 4 Drying, suction filtration, rotary evaporation, and drying gave p-styrenesulfonyl chloride, which was dissolved in anhydrous acetonitrile for later use.

[0093] (2) Dissolve 0.05mol benzene...

Embodiment 2

[0100] (1) According to the method of Example 1, the single-ion conductor polymer electrolyte shown in formula (1) was prepared, wherein x=100, y=20, z=40, n=9.

[0101] (2) Proportionally disperse the above-mentioned single ion conductor polymer electrolyte and polyvinylidene fluoride-hexafluoropropylene copolymer in a mixed solvent of N,N-dimethylformamide and acetone to prepare spinning solution, spinning solution The single-ion conductor polymer electrolyte composite diaphragm is prepared through an electrospinning process; the mass ratio of the single-ion conductor polymer electrolyte to polyvinylidene fluoride-hexafluoropropylene copolymer is 1:20; the electrospinning process parameters are: The spinning solution concentration is 12wt%, the spinning voltage is 17kV, the receiving distance is 15cm, and the jetting speed is 2.5mL / h.

[0102] The measured thickness of the single-ion conductor polymer electrolyte composite diaphragm is about 50 microns, and it is assembled i...

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Abstract

The invention belongs to the related field of battery diaphragms, and particularly relates to a single-ion-conductor polymer electrolyte composite diaphragm as well as a preparation method and application thereof. The single-ion-conductor polymer electrolyte composite diaphragm used for a battery and having the advantages that the mechanical strength, the battery rate and the cycle performance areobviously improved at the same time is obtained by blend spinning of a single-ion-conductor polymer electrolyte with specific structure and composition and a polymer matrix. According to the invention, the hydrogen-bond interaction is formed between the single-ion-conductor polymer electrolyte and the polymer matrix, so that the mechanical strength of the composite diaphragm can be obviously enhanced, the metal ion transference number can be obviously increased, and the growth of metal dendrites can be effectively inhibited. The composite diaphragm prepared by the method is high in porosity and high in ionic conductivity, is beneficial to the rate and cycle performance of the battery, and has a good application prospect.

Description

technical field [0001] The invention belongs to the field related to battery diaphragms, and more specifically relates to a single ion conductor polymer electrolyte composite diaphragm, its preparation method and application. Background technique [0002] Due to the advantages of high specific energy and energy density, low self-discharge rate, wide operating voltage and operating temperature range, environmental friendliness, and long cycle life, lithium-ion batteries are widely used in portable electronic products, power tools, electric vehicles and hybrid Power vehicles and other electronic equipment fields. At present, lithium-ion batteries mainly use flammable, explosive and volatile organic liquid electrolytes, which cause potential safety hazards during long-term use. As a material with good processing performance, polymer electrolyte can be rationally designed according to different battery performance requirements, and then endow the electrolyte with multiple funct...

Claims

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Application Information

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IPC IPC(8): D04H1/728D01D5/00H01M50/403H01M50/414H01M10/0565H01M10/0525H01M10/42
CPCD01D5/003D04H1/728H01M10/0525H01M10/0565H01M10/4235H01M2220/20H01M2220/30Y02E60/10
Inventor 薛志刚甘辉辉周兴平解孝林
Owner HUAZHONG UNIV OF SCI & TECH
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