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Electrochemical power-supply composite membrane and preparation method thereof

A composite diaphragm and electrochemical technology, applied in the field of electrochemical power supply, can solve the problems of non-woven diaphragm, excessive pores, self-discharge, etc.

Inactive Publication Date: 2014-02-12
OCEANS KING LIGHTING SCI&TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, non-woven separators have better thermal dimensional stability than polyolefin separators, but non-woven separators cannot be directly used as separators for electrochemical power sources (lithium-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 composite membrane and preparation method thereof
  • Electrochemical power-supply composite membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A composite separator for electrochemical power supply and its preparation method:

[0037] The composite diaphragm structure of the electrochemical power source is as follows figure 1 As shown, it includes an oxidized aluminum mesh layer 1 and a polyvinylidene fluoride-hexafluoropropylene copolymer layer 2 combined with both sides of the aluminum mesh layer 1 . Wherein, the thickness of the polyvinylidene fluoride-hexafluoropropylene copolymer layer 2 is 10 μm, and the thickness of the aluminum mesh layer 1 is 30 μm.

[0038] The preparation method of the electrochemical power composite diaphragm:

[0039] Step S11. Preparation of polyvinylidene fluoride-hexafluoropropylene copolymer organic solution: Take a certain amount of PVDF-HFP with a HFP content of 2% and add it to a container containing a certain amount of acetone, and stir evenly to obtain PVDF-HFP 10% acetone solution;

[0040] Step S12. Oxidation treatment of the aluminum mesh: place an aluminum mesh wit...

Embodiment 2

[0044] A composite separator for electrochemical power supply and its preparation method:

[0045] The structure of the composite diaphragm for electrochemical power source is the same as that of the composite diaphragm for electrochemical power source in Example 1. Wherein, the thickness of the polyvinylidene fluoride-hexafluoropropylene copolymer layer is 15 μm, and the thickness of the aluminum mesh layer 1 is 40 μm.

[0046] The preparation method of the electrochemical power composite diaphragm:

[0047] Step S21. Preparation of polyvinylidene fluoride-hexafluoropropylene copolymer organic solution: Take a certain amount of PVDF-HFP with a HFP content of 5% and add it to a container containing a certain amount of chloroform, and stir evenly to obtain PVDF-HFP 10% chloroform solution;

[0048] Step S22. Oxidation treatment of the aluminum mesh: place 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,...

Embodiment 3

[0052] A composite separator for electrochemical power supply and its preparation method:

[0053] The structure of the composite diaphragm for electrochemical power source is the same as that of the composite diaphragm for electrochemical power source in Example 1. Wherein, the thickness of the polyvinylidene fluoride-hexafluoropropylene copolymer layer is 10 μm, and the thickness of the aluminum mesh layer 1 is 20 μm.

[0054] The preparation method of the electrochemical power composite diaphragm:

[0055] Step S31. Preparation of polyvinylidene fluoride-hexafluoropropylene copolymer organic solution: Take a certain amount of PVDF-HFP with a HFP content of 1% and add it to a container containing a certain amount of tetrahydrofuran, and stir evenly to obtain the PVDF-HFP content 20% tetrahydrofuran solution;

[0056] Step S22. Oxidation treatment of the aluminum mesh: place an aluminum mesh with a thickness of 10 microns and a pore size of 95 microns in a muffle furnace an...

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Abstract

The invention provides an electrochemical power-supply composite membrane and a preparation method thereof. The electrochemical power-supply composite membrane comprises an oxidized aluminium net layer and a polyvinylidene fluoride-hexafluoropropene copolymer layer combining with the surface of the aluminium net layer, and the thickness of the polyvinylidene fluoride-hexafluoropropene copolymer layer is 5-10 mu m. The preparation method of the electrochemical power-supply composite membrane comprises: preparing an organic solution of polyvinylidene fluoride-hexafluoropropene copolymer, performing oxidation process on the aluminium net, coating the aluminium net with the organic solution of polyvinylidene fluoride-hexafluoropropene copolymer, performing drying process and the like. The electrochemical power-supply composite membrane is good in heat dissipation effect and resistant to high temperature, has uniformly-distributed pores capable of effectively avoiding direct contact of electrode particles, and is high in safety. The preparation method of the composite membrane is simple, the condition is easy to control, the requirements on equipment are low, the production efficiency is high, the production cost is low, and the preparation method is suitable for industrial production.

Description

technical field [0001] The invention belongs to the technical field of electrochemical power sources, and in particular relates to a composite diaphragm of electrochemical power sources and a preparation method thereof. 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 battery to rep...

Claims

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Application Information

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IPC IPC(8): H01M2/16B32B15/20B32B27/32H01M50/403H01M50/426H01M50/451
CPCH01M50/446H01M50/403Y02E60/10
Inventor 周明杰袁贤阳王要兵
Owner OCEANS KING LIGHTING SCI&TECH CO LTD
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