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Electrochemical power source membrane, preparation method of electrochemical power source membrane and electrochemical battery or capacitor

An electrochemical and diaphragm technology, applied in the field of electrochemistry, can solve the problems of poor electrolyte wetting performance, uneven distribution, low heat resistance temperature, etc., and achieve the effects of simple and effective preparation method, improved safety, and high film breaking temperature.

Active Publication Date: 2014-08-06
OCEANS KING LIGHTING SCI&TECH CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this kind of separator not only has poor wettability to the electrolyte, but also has a low heat resistance temperature.
Non-woven separators are widely used due to their excellent heat resistance and good mechanical strength, but they have the disadvantages of excessively large pores and uneven distribution

Method used

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  • Electrochemical power source membrane, preparation method of electrochemical power source membrane and electrochemical battery or capacitor

Examples

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Effect test

Embodiment 1

[0038] A preparation method of an electrochemical power separator, comprising the following steps:

[0039] (1) Dissolving polyvinyl alcohol in deionized water to form an emulsion, in which the mass percentage of polyvinyl alcohol is 1%;

[0040] (2) Add tetraethyl orthosilicate with a purity of 99% and a mass five times that of polyvinyl alcohol to the above emulsion, mix well, and then drop into the obtained emulsion containing tetraethyl orthosilicate with a mass concentration of 20% ammoniacal liquor, stirred for 4 hours to obtain a mixed liquid; wherein, the mass ratio of the dripped ammoniacal liquor quality to tetraethyl orthosilicate was 1:4;

[0041] (3) After immersing a PET non-woven fabric with a thickness of 10 μm in the mixed liquid for 0.5 hours, take it out and place it in an ammonia atmosphere for 1 hour, rinse it with deionized water until the pH is neutral, and finally place it at 50°C Take it out after drying in a dry oven for 24 hours to obtain an electro...

Embodiment 2

[0044] A preparation method of an electrochemical power separator, comprising the following steps:

[0045] (1) dissolving polytetrafluoroethylene in ethanol to form an emulsion, in which the mass percentage of polytetrafluoroethylene is 5%;

[0046] (2) Add tetraethyl orthosilicate with a purity of 99.9% and a mass 10 times the mass of polytetrafluoroethylene to the above emulsion, mix well, and then drop into the obtained emulsion containing ethyl orthosilicate with a mass concentration of 25 % ammoniacal liquor, stir 8 hours, obtain mixed liquid; Wherein, the mass ratio of the ammoniacal liquor quality that drops into and tetraethyl orthosilicate is 1:3;

[0047](3) After immersing a PET non-woven fabric with a thickness of 20 μm in the mixed liquid for 1 hour, take it out and place it in an ammonia atmosphere for 1 hour, rinse it with deionized water until the pH is neutral, and finally place it at 60 °C Take it out after drying in a dry oven for 24 hours to obtain an ele...

Embodiment 3

[0051] A preparation method of an electrochemical power separator, comprising the following steps:

[0052] (1) Dissolving polyvinylidene fluoride-hexafluoropropylene (PVDF-HFP) in acetone to form an emulsion, in which the mass percentage of PVDF-HFP is 6%;

[0053] (2) Add tetraethyl orthosilicate with a purity of 99% and a mass 20 times the mass of PVDF-HFP to the above emulsion, mix well, and then drop into the obtained emulsion containing ethyl orthosilicate with a mass concentration of 30% ammoniacal liquor, stirred for 10 hours to obtain a mixed liquid; wherein, the mass ratio of the dripped ammoniacal liquor quality to tetraethyl orthosilicate was 1:2.5;

[0054] (3) After immersing the PAN non-woven fabric with a thickness of 30 μm in the mixed liquid for 1.5 hours, take it out and place it in an ammonia atmosphere for 1 hour, rinse it with deionized water until the pH is neutral, and finally place it at 70°C Take it out after drying in a drying oven for 24 hours to o...

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Abstract

The invention provides an electrochemical power source membrane and a preparation method of the electrochemical power source membrane. The preparation method includes the steps of dissolving binders in a solvent to form emulsions, wherein the mass percentage composition of the binders in the emulsions ranges from 1% to 10%; adding tetraethoxysilane with the mass 5-30 times that of the binders in the emulsions, evenly mixing the tetraethoxysilane and the emulsions, then dropping ammonium hydroxide with the mass concentration ranging from 20% to 35% in the emulsions, conducting stirring for 4-12 hours, and obtaining mixed liquid, wherein the ratio of the mass of the dropped ammonium hydroxide to the mass of the tetraethoxysilane ranges from 1:1.5 to 1:4; immersing a non-woven fabric membrane into the mixed liquid for 0.5-3 hours, taking out the non-woven fabric membrane, drying the non-woven fabric membrane, and then obtaining the non-woven fabric electrochemical power source membrane with the surface wrapped by silicon dioxide. The electrochemical power source membrane is appropriate in hole diameter, good in heat-resistant quality and high in safety, and the safety of an electrochemical battery or capacitor can be effectively and accordingly improved. The invention further provides the electrochemical battery or capacitor with the electrochemical power source membrane.

Description

technical field [0001] The invention relates to the field of electrochemistry, in particular to an electrochemical power separator and a preparation method thereof. The invention also relates to an electrochemical cell or capacitor. Background technique [0002] With the development of human productivity, more and more cars are driving in the streets and alleys of cities and villages. The popularity of automobiles has brought great convenience to people's lives. However, the accompanying problems are becoming more and more serious. The consumption of non-renewable energy such as petroleum continues to accelerate, and the impact of vehicle exhaust emissions on the environment continues to expand. At present, in order to solve these problems, people propose to develop electric vehicles in order to replace traditional vehicles. The key lies in whether there is a power battery with sufficient energy density, power density, long enough cycle life, and safe and reliable power ...

Claims

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Application Information

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IPC IPC(8): H01G11/84H01G11/52H01M2/16H01M50/417H01M50/431
CPCY02E60/13
Inventor 周明杰吴凤
Owner OCEANS KING LIGHTING SCI&TECH CO LTD
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