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Electrochemical power separator and preparation method thereof, electrochemical cell or capacitor

An electrochemical and diaphragm technology, applied in the field of electrochemistry, can solve the problems of poor electrolyte wettability, uneven distribution, low heat resistance temperature, etc., to meet the requirements of packaging and cycle performance, overcome uneven distribution, and improve safety Effect

Active Publication Date: 2017-03-01
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 separator and preparation method thereof, electrochemical cell 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) polyvinyl alcohol is dissolved in deionized water to form an emulsion, and in the emulsion, the mass percentage of polyvinyl alcohol is 1%;

[0040] (2) To the above-mentioned emulsion, add tetraethyl orthosilicate with a purity of 99% and a mass 5 times that of polyvinyl alcohol, mix well, and then drop in the obtained emulsion containing ethyl 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 o...

Embodiment 2

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

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

[0046] (2) To the above-mentioned emulsion, add tetraethyl orthosilicate with a purity of 99.9% and a quality 10 times that of polytetrafluoroethylene, mix well, and then drop in the obtained emulsion containing ethyl orthosilicate with a mass concentration of 25 % ammonia water, stirred for 8 hours to obtain a mixed liquid; wherein, the mass ratio of the dripped ammonia water quality to tetraethyl orthosilicate was 1:3;

[0047](3) After immersing the 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 hour...

Embodiment 3

[0050] A preparation method of an electrochemical power separator, comprising the following steps:

[0051] (1) dissolving polyvinylidene fluoride-hexafluoropropylene (PVDF-HFP) in acetone to form an emulsion, in which the mass percentage of PVDF-HFP is 6%;

[0052] (2) To the above emulsion, add tetraethyl orthosilicate with a purity of 99% and a quality 20 times that of PVDF-HFP, mix well, and then drop in 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;

[0053] (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 ob...

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Abstract

The invention provides an electrochemical power separator and a preparation method thereof, the method comprising: dissolving a binder in a solvent to form an emulsion, the mass percentage of the binder in the emulsion is 1% to 10%; Add tetraethyl orthosilicate 5 to 30 times the mass of the binder, mix evenly, then drop ammonia water with a mass concentration of 20% to 35% into the emulsion, and stir for 4 to 12 hours to obtain a mixed liquid; among them, drop The mass ratio of ammonia water to tetraethyl orthosilicate is 1:1.5~1:4; immerse the non-woven fabric diaphragm in the mixed liquid for 0.5~3 hours, take it out, and dry it to obtain the surface coated with silicon dioxide. Nonwoven electrochemical power separator. The electrochemical power separator has suitable aperture, good heat resistance and high safety, thereby effectively improving the safety of electrochemical batteries or capacitors. The present invention also provides an electrochemical cell or capacitor using the separator.

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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Patent Type & Authority Patents(China)
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