Electrochemical power supply diaphragm, preparation method thereof and electrochemical power supply

An electrochemical and power supply technology, applied in the field of electrochemical power supply, can solve the problems of excessive pores, self-discharge, uneven distribution, etc., and achieve the effects of low equipment requirements, low production cost and simple process

Inactive Publication Date: 2014-06-11
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, nonwoven separators cannot be directly used as separators for electrochemical power sources (Li-ion batteries and supercapacitors)
Because its pores are too large, it is easy to cause short circuit and cause self-discharge
At the same time, the distribution of pores is uneven. Such a separator will cause the electrochemical power source (lithium-ion battery and supercapacitor) to form lithium dendrites during use, resulting in a short-circuit safety hazard.
Although some people overcome the defects of large pores and uneven distribution by coating non-woven fabrics
But as an organic matter, the melting point of non-woven fabrics is still low

Method used

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  • Electrochemical power supply diaphragm, preparation method thereof and electrochemical power supply
  • Electrochemical power supply diaphragm, preparation method thereof and electrochemical power supply

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preparation example Construction

[0028] Correspondingly, the embodiment of the present invention also provides a method for preparing the above-mentioned electrochemical power separator, the process flow chart of the method is as follows figure 2 shown, see also figure 1 . This preparation method comprises the steps:

[0029] Step S01. Oxidizing the aluminum mesh;

[0030] Step S02. Prepare an organic-inorganic suspension: dissolve the organic binder in an organic solvent and add inorganic powder to prepare a suspension;

[0031] Step S03. Film-forming treatment of the organic-inorganic suspension on the surface of the aluminum mesh: coating the suspension prepared in step S02 on the surface of the aluminum mesh and drying to obtain the electrochemical power separator.

[0032] Specifically, in the above-mentioned step S01, the oxidation treatment of the aluminum mesh is preferably performed as follows: the aluminum mesh is placed in an oxidizing atmosphere and oxidized at 200-650° C. for 0.5-24 hours.

...

Embodiment 1

[0044] A battery diaphragm, a preparation method thereof and a lithium ion battery, the preparation method of the battery diaphragm comprises the following steps:

[0045] S11: placing an aluminum mesh with a thickness of 20 microns and a pore size of 20 microns in a muffle furnace at 500° C. for 6 hours, and taking out the oxidized aluminum mesh after cooling;

[0046] S12: Add 40 parts by weight of polytetrafluoroethylene to the container containing acetone, and keep stirring until it is completely dissolved to form an organic solution, and then add 10 parts by weight of hollow oxide polytetrafluoroethylene with an average particle diameter of 500 nanometers to the organic solution. aluminum powder, and stir evenly to obtain an organic-inorganic suspension, wherein the mass percent concentration of the hollow alumina powder in the organic-inorganic suspension is 10%;

[0047] S13: Immerse the oxidized aluminum mesh into the organic-inorganic suspension prepared in step S12, ...

Embodiment 2

[0051] A battery diaphragm, a preparation method thereof and a lithium ion battery, the preparation method of the battery diaphragm comprises the following steps:

[0052] S21: placing an aluminum mesh with a thickness of 25 microns and a pore size of 10 microns in a muffle furnace at 400° C. for 12 hours, and taking out the oxidized aluminum mesh after cooling;

[0053] S22: Add 50 parts by weight of polytetrafluoroethylene into a container containing 2 parts of acetone, and keep stirring until it is completely dissolved to form an organic solution, and then add 25 parts by weight of hollow polytetrafluoroethylene with an average particle diameter of 200 nanometers to the organic solution. Silica powder, and stir evenly, obtain organic-inorganic suspension; Wherein, the mass percent concentration of hollow silica powder in organic-inorganic suspension is 25%;

[0054] S23: Immerse the oxidized aluminum mesh into the organic-inorganic suspension prepared in step S22, and keep ...

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Abstract

The invention provides an electrochemical power supply diaphragm, a preparation method thereof and an electrochemical power supply. The electrochemical power supply includes an oxidation-treated aluminum net and an organic binder and inorganic powder composite layer coating the aluminum net surface. The preparation method of the electrochemical power supply diaphragm comprises the following steps: aluminum net oxidation treatment, organic-inorganic suspension preparation and film forming treatment of organic-inorganic suspension on the aluminum net surface. The electrochemical power supply includes the electrochemical power supply diaphragm. The electrochemical power supply diaphragm uses the surface-oxidized aluminum net as a diaphragm matrix, the resistance temperature, heat dissipation performance and dimensional stability of the electrochemical power supply diaphragm can be effectively improved, and the preparation method has the advantages of simple process, easily-controlled conditions, high production efficiency, low production cost and suitability for industrialized production.

Description

technical field [0001] The invention belongs to the technical field of electrochemical power sources, and in particular relates to a battery diaphragm, a preparation method thereof, and an electrochemical power source. 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 source with sufficient energy density, power density, long enough cycle life, and safety and reliability to replace the in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01G11/52H01G11/84H01M50/403H01M50/431H01M50/446H01M50/449
CPCH01G11/52H01M10/0525H01M50/431H01M50/446H01M50/403H01M50/449Y02E60/10
Inventor 周明杰王要兵
Owner OCEANS KING LIGHTING SCI&TECH CO LTD
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