Composite diaphragm and method for preparing same

A composite diaphragm and polymer technology, applied in the direction of separator/film/diaphragm/spacer components, electrical components, circuits, etc., can solve hidden dangers, polyolefin diaphragms have safety problems, achieve low cost and low pollution, and improve Effect of wettability and improvement of thermal safety

Active Publication Date: 2014-01-15
SHENZHEN SENIOR TECH MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the disadvantages of existing polyolefin diaphragms that have potential safety hazards at high temperatures, the purpose of the present invention is to provide a composite diaphragm with high safety at high temperatures and its preparation method

Method used

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  • Composite diaphragm and method for preparing same
  • Composite diaphragm and method for preparing same
  • Composite diaphragm and method for preparing same

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preparation example Construction

[0024] refer to figure 1 , a composite diaphragm, comprising a stacked support layer 1 and an organic / inorganic particle blend coating layer 2, the preparation method of which comprises the following steps:

[0025] 1) Using deionized water as a solvent, dissolve water-based adhesives, surfactants, dispersants, thickeners, etc. under normal temperature and high-speed stirring to form a solution; then add polymer particles and inorganic particles, and stir evenly at high speed , made into water-based slurry; the mass percentage of each substance in the slurry is: 0.1%-2% water-soluble polymer thickener, 0.01%-2% water-based dispersant, 0.01%-2% surfactant , 0.1%~5% water-based adhesive, 5%~50% polymer particles and inorganic particles, 50%~83% deionized water;

[0026] 2) Using micro gravure roll coating, the water-based slurry prepared in the first step is coated on the support layer diaphragm, and the coating speed is 5-100m / min;

[0027] 3) The coating film obtained in the...

Embodiment 1

[0031] The weight ratio of organic / inorganic mixed particles in the slurry: deionized water = 100: 200, PVDF-HFP: Al 2 o 3 =20:80. First, add the adhesive PVA and tackifier CMC into deionized water, stir at 300r / min at room temperature for 20min until completely dissolved, wherein the weight ratio of PVA and CMC is PVA:organic / inorganic mixed particles=4.5:100 , CMC:organic / inorganic hybrid particles=1.5:100. Then add fluorocarbon surfactant, water-based dispersant polyoxypropylene mannitol dioleate and organic / inorganic mixed particle powder to the above solution in sequence, continue to stir at 300r / min for 10min, and finally stir at 5000r / min for 5min , the slurry preparation is completed. Among them, fluorocarbon surfactant: organic / inorganic mixed particles=0.2:100, polyoxypropylene mannitol dioleate: organic / inorganic mixed particles=0.6:100. The weight average molecular weight of PVDF-HFP is about 370,000, the particle size is 100-300nm, Al 2 o 3 Powder D50 = 1.0 ...

Embodiment 2

[0033] The weight ratio of organic / inorganic mixed particles in the slurry: deionized water = 100: 200, PVDF-HFP: Al 2 o 3=38:62. First, add the adhesive PVA and tackifier CMC into deionized water, stir at 300r / min at room temperature for 20min until completely dissolved, wherein the weight ratio of PVA and CMC is PVA:organic / inorganic mixed particles=4.5:100 , CMC:organic / inorganic hybrid particles=1.5:100. Then add fluorocarbon surfactant, water-based dispersant polyoxypropylene mannitol dioleate and organic / inorganic mixed particle powder to the above solution in sequence, continue to stir at 300r / min for 10min, and finally stir at 5000r / min for 5min , the slurry preparation is completed. Among them, fluorocarbon surfactant: organic / inorganic mixed particles=0.2:100, polyoxypropylene mannitol dioleate: organic / inorganic mixed particles=0.6:100. The weight average molecular weight of PVDF-HFP is about 370,000, the particle size is 100-300nm, Al 2 o 3 Powder D50 = 1.0 μ...

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Abstract

The invention discloses a composite diaphragm which comprises a supporting layer and an organic/inorganic particle blended coating layer, laminated; the coating layer comprises a polymer particle and an inorganic particle, uniformly mixed in an adhesive; micropore structures are arranged on the surface and at the inner part of the coating layer; the porosity is 20%-80%; the aperture average is 0.01 to 10 micrometers; the polymer particle comprises one or more of polytetrafluoroethylene, polyvinylidene fluoride, polyvinylidene fluoride-hexafluoropropylene copolymer, polyimide, polyacrylonitrile and aramid fiber resin; the particle size of the polymer particle is 0.01-10 micrometers; the inorganic particle comprises any one or more of SiO2, Al2O3, CaO, TiO2, MgO, ZnO, SnO2 and ZrO2; the particle size of the inorganic particle is 0.01-10 micrometers; the mass ratio of the polymer particle to the inorganic particle is (1:10) to (10:1). The invention further discloses a method for preparing the composite diaphragm. The composite diaphragm and the method have good thermal safety and strong in electrolyte absorption stiffness value, and meanwhile, and can achieve the advantages of low cost and low pollution.

Description

technical field [0001] The invention relates to lithium battery diaphragms, in particular to a composite diaphragm with high safety performance at high temperature and a preparation method thereof. Background technique [0002] As one of the four major materials of lithium batteries, diaphragm is an important component in lithium batteries although it does not participate in the electrochemical reaction in the battery. At the same time, diaphragm technology is also one of the key technologies restricting the development and application of lithium batteries in my country. Key properties such as battery capacity, cycle performance, and charge-discharge current density are directly related to the diaphragm, and the improvement of the performance of the diaphragm plays an important role in improving the overall performance of the lithium battery. [0003] At present, commercialized lithium battery separators are mainly polyolefin (PP, PE) single-layer films or multi-layer films....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M50/403H01M50/446H01M50/449
CPCH01M50/409H01M50/403Y02E60/10
Inventor 陈秀峰陈良杨佳富吴术球王今刚
Owner SHENZHEN SENIOR TECH MATERIAL
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