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Electrochemical power-supply composite membrane and preparation method thereof

A composite diaphragm, electrochemical technology, applied in the field of electrochemical power supply, can solve the problems of short circuit, self-discharge, non-woven diaphragm can not be diaphragm and so on

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.

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

[0033] A composite separator for electrochemical power supply and its preparation method:

[0034] The composite diaphragm structure of the electrochemical power source is as follows figure 1 As shown, it includes a non-woven membrane layer 1 and a polyvinylidene fluoride-hexafluoropropylene copolymer layer 2 combined with both sides of the non-woven membrane layer 1 . Wherein, the thickness of the polyvinylidene fluoride-hexafluoropropylene copolymer layer 2 is 8 μm, and the thickness of the non-woven separator layer 1 is 12 μm.

[0035] The preparation method of the electrochemical power composite diaphragm:

[0036] Step S 11. Preparation of polyvinylidene fluoride-hexafluoropropylene copolymer organic solution: Take a certain amount of PVDF-HFP with a HFP content of 8% and add it to a container containing a certain amount of acetone, and stir evenly to obtain PVDF-HFP HFP content is 8% acetone solution;

[0037] Step S12. Coating the polyvinylidene fluoride-hexafluoropr...

Embodiment 2

[0040] A composite separator for electrochemical power supply and its preparation method:

[0041] 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 non-woven separator layer is 30 μm.

[0042] The preparation method of the electrochemical power composite diaphragm:

[0043] 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 dimethylformamide, and stir evenly. Obtain PVDF-HFP content and be the dimethylformamide solution of 12%;

[0044] Step S22. Coating the polyvinylidene fluoride-hexafluoropropylene copolymer organic solution and drying: immerse the non-woven fabric diaphrag...

Embodiment 3

[0047] A composite separator for electrochemical power supply and its preparation method:

[0048] 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 polyvinylidene fluoride-hexafluoropropylene copolymer layer has a thickness of 10 μm, and the non-woven separator layer has a thickness of 50 μm.

[0049] The preparation method of the electrochemical power composite diaphragm:

[0050] 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 mixed solution containing a certain amount of acetone and tetrahydrofuran with a volume ratio of 1:1 container, and stir evenly to obtain a mixed solution of acetone and tetrahydrofuran with a PVDF-HFP content of 20%;

[0051] Step S32. Coating the organic solution of polyvinylidene fluoride-hexaflu...

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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 a non-woven fabrics layer and a polyvinylidene fluoride-hexafluoropropene copolymer layer combining with the surface of the non-woven fabrics 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, coating the non-woven fabrics layer 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 resistance and stable in thermal dimension, 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): H01M2/16B32B5/24B32B27/32H01M50/403H01M50/417H01M50/449
CPCH01M50/411H01M50/44H01M50/403Y02E60/10
Inventor 周明杰袁贤阳王要兵
Owner OCEANS KING LIGHTING SCI&TECH CO LTD
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