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Water-soluble polymer gel polymer electrolyte, preparation method thereof and application thereof

A water-soluble polymer and water-soluble polymer technology, applied in the field of electrochemical energy storage, can solve the problems of environmental pollution, complex preparation process, high cost, etc., and achieve the effects of avoiding environmental pollution, simple preparation process and low cost

Inactive Publication Date: 2019-10-01
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the preparation process of gel polymer electrolyte consumes a large amount of organic solvents, causing serious environmental pollution. At the same time, the preparation process is complicated and the cost is high. Therefore, it is necessary to develop a polymer electrolyte system based on water-soluble polymers.

Method used

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  • Water-soluble polymer gel polymer electrolyte, preparation method thereof and application thereof
  • Water-soluble polymer gel polymer electrolyte, preparation method thereof and application thereof
  • Water-soluble polymer gel polymer electrolyte, preparation method thereof and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 2

[0050] (1) Mix sodium carboxymethyl cellulose (CMC), lithium lanthanum zirconium oxygen solid electrolyte and water at a ratio of 1 / 1 / 200 (w / w / w), stir at room temperature for 6 hours to obtain a dispersed aqueous solution.

[0051] (2) Pour the aqueous solution into a storage container of a freeze dryer, freeze-dry at a cold trap temperature of -60° C. and a vacuum of 10 Pa.

[0052] (3) The dried product was rolled by heating at 80° C. for 50 times to obtain a polymer film of 35 μm.

[0053] (4) After the prepared electrolyte membrane was cut into an appropriate size, it was placed in a vacuum drying oven, dried at 80°C for 24 hours to remove traces of water, cooled to room temperature under vacuum, and transferred into a glove box for storage. Soak it in 1molL -1 LiPF 6 Carboxymethylcellulose gel polymer electrolyte (CMC-GPE) was obtained in electrolyte solution (purchased from Zhangjiagang Guotai Huarong New Material Co., Ltd.) for 12 hours.

Embodiment 3

[0055] (1) Mix polyvinyl alcohol (PVA) and polyethylene oxide (PEO) with water at a ratio of 1 / 1 / 100 (w / w / w), and stir at room temperature for 6 hours to obtain a clear and uniform solution .

[0056] (2) Pour the aqueous solution into a storage container of a freeze dryer, freeze-dry at a cold trap temperature of -60° C. and a vacuum of 10 Pa.

[0057] (3) The dried product was heated and rolled at 60° C. for 30 times and 50 times to obtain a polymer film of 20 μm.

[0058] (4) After the prepared electrolyte membrane was cut into an appropriate size, it was placed in a vacuum drying oven, dried at 80°C for 24 hours to remove traces of water, cooled to room temperature under vacuum, and transferred into a glove box for storage. Soak it in 1molL -1 Polyvinyl alcohol-polyethylene oxide gel polymer electrolyte (PVA-PEO-GPE) was obtained in LiTFSI electrolyte (purchased from Zhangjiagang Guotai Huarong New Material Co., Ltd.) for 12 hours.

[0059] (5) Activated carbon is used ...

Embodiment 1

[0070] where, σ is the electrical conductivity, l is the thickness of the film, R b and A are the resistance of the membrane and the area of ​​the electrode, respectively. The room temperature conductivity of the method of embodiment 1 obtained methyl cellulose gel membrane (MC-GPE) is 0.7mS cm -1 , the conductivity of the Celgard 2730 separator in the comparative example is 0.43mS cm -1。

[0071] The lithium ion migration number is calculated by formula (4):

[0072] t Li + = I SS / I 0 (4)

[0073] Among them, I 0 and I SS are the initial state current value and steady state current value obtained by the chronoflow method, respectively. The lithium ion migration number of the methylcellulose gel membrane (MC-GPE) obtained by the method in Example 1 was 0.48, and the lithium ion migration number of the Celgard 2730 diaphragm in the comparative example was 0.27.

[0074] From the comparison of the examples and the comparative examples, the gel polymer electrolyte ba...

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Abstract

The invention belongs to the field of polymer materials and batteries and particularly relates to a water-soluble polymer material gel polymer electrolyte and a preparation method thereof, and the invention also relates to the application of the gel polymer electrolyte in a primary or secondary electrochemical energy storage system. The gel polymer electrolyte is composed of a polymer film and a liquid electrolyte. The invention relates to the preparation method of the gel polymer electrolyte, and the method has a simple preparation process and low cost, and the preparation process is environment-friendly. The prepared gel polymer electrolyte has the advantages of high conductivity, wide electrochemical window, high lithium-ion migration number and good compatibility with electrode materials, the growth of metal dendrites can be effectively inhibited, and the cycle stability and rate performance of a battery and a capacitor can be significantly improved. The gel polymer electrolyte canbe used in the primary or secondary electrochemical energy storage system with high energy density, large capacity and high safety.

Description

technical field [0001] The invention relates to the technical field of electrochemical energy storage, in particular to a water-soluble polymer gel polymer electrolyte and a preparation method and application thereof. Background technique [0002] Lithium-ion battery is an important electrochemical energy storage device at present. It has the advantages of high energy density, environmental friendliness, and no memory effect. Since its commercialization, it has had a profound impact on modern life. Energy storage equipment of choice such as small smart grids. However, the current lithium-ion battery is limited by its own conditions, requiring a large amount of organic liquid electrolyte. The organic liquid electrolyte is very easy to burn when the battery is abused, internal overheating or micro-short circuit, causing battery safety accidents. In order to improve the safety of batteries, solid-state electrolytes have become the focus of researchers. Solid-state electrolyt...

Claims

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Application Information

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IPC IPC(8): H01M10/0525H01M10/0565H01G11/56
CPCH01M10/0525H01M10/0565H01G11/56H01M2300/0085H01M2300/0091Y02E60/10
Inventor 闫文其梁士硕马添翼史一朱玉松余能飞吴宇平
Owner NANJING UNIV OF TECH
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