Sticky ceramic diaphragm and preparation method thereof

A ceramic diaphragm and viscous technology, which is applied in the field of viscous ceramic diaphragm and its preparation, can solve problems such as wrinkling and curling, and achieve the effects of improving yield rate, improving thermal stability, and efficient automatic assembly

Inactive Publication Date: 2016-08-24
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention aims to solve the above problems, and provides a viscous ceramic diaphragm and its preparation method. The present invention solves the problems of curling and wrinkling caused by secondary coating, improves the thermal stability of the diaphragm, and greatly improves the rate of defective products. , at the same time, the realization of the organic electrode bonding layer on the surface of the ceramic layer is conducive to the realization of efficient automatic assembly

Method used

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  • Sticky ceramic diaphragm and preparation method thereof
  • Sticky ceramic diaphragm and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0034] 1) Select PP with a thickness of 25 microns and a porosity of 45% as the porous substrate;

[0035] Inorganic ceramic particles alumina (Al2O3) 13%, binder acrylonitrile polymer (LA133) 5%, dispersant polyvinylpyrrolidone 1.5%, leveling agent modified polysiloxane 0.5%, and the rest is solvent Ionized water, for high-speed dispersion to form a uniform inorganic ceramic slurry;

[0036] Select polymethyl methacrylate and acetone to fully stir and dissolve at a weight ratio of 3:97 to make glue.

[0037] 2) Immerse the porous substrate in the inorganic ceramic slurry, and at the same time, stir the inorganic ceramic slurry at a stirring speed of 30 rpm, so that it is evenly dispersed on the surface of the porous substrate;

[0038] 3) Dry it at 55°C to form a double-sided inorganic ceramic coating on the surface of the porous substrate to obtain a porous ceramic diaphragm; 4) Immerse the porous ceramic diaphragm in the glue solution, and simultaneously stir the glue solu...

Embodiment 2

[0043] 1) Choose PE with a thickness of 20 microns and a porosity of 50% as the porous substrate;

[0044]Inorganic ceramic particle boehmite (AlO(OH)) 40%, binder polyacrylic acid 10%, dispersant sodium silicate 0.05%, leveling agent polyether modified polydimethylsiloxane 0.5%, The rest is the solvent N-methylpyrrolidone, which is dispersed at a high speed to form a uniform inorganic ceramic slurry;

[0045] Polyvinylidene fluoride-co-hexafluoropropylene and N-methylpyrrolidone were selected and stirred and dissolved at a weight ratio of 2.5:97.5 to make a glue solution.

[0046] 2) Immerse the porous substrate in the inorganic ceramic slurry, and at the same time, stir the inorganic ceramic slurry at a stirring speed of 100 rpm, so that it is evenly dispersed on the surface of the porous substrate;

[0047] 3) Dry it at 30°C to form a double-sided inorganic ceramic coating on the surface of the porous substrate to obtain a porous ceramic diaphragm;

[0048] 4) Immerse the...

Embodiment 3

[0051] 1) Select PP with a thickness of 25 microns and a porosity of 30% as the porous substrate;

[0052] Inorganic ceramic particle barium sulfate (BaSO4) 5%, binder polyvinylidene fluoride 2%, dispersant Hypermer KD-1 2%, leveling agent modified polysiloxane 3%, and the rest is solvent isopropanol, Fully mix and disperse at high speed to form a uniform inorganic ceramic slurry;

[0053] Select sodium carboxymethyl cellulose and acetone at a weight ratio of 10:90 and fully stir to make glue.

[0054] 2) Immerse the porous substrate in the inorganic ceramic slurry, and at the same time, stir the inorganic ceramic slurry at a stirring speed of less than 50 rpm, so that it is evenly dispersed on the surface of the porous substrate;

[0055] 3) Dry it at 70°C to form a double-sided inorganic ceramic coating on the surface of the porous substrate to obtain a porous ceramic diaphragm;

[0056] 4) Immerse the porous ceramic diaphragm in the glue solution, and at the same time sti...

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Abstract

The invention discloses a preparation method of a sticky ceramic diaphragm. The method comprises the following steps: selecting a porous substrate; dipping the porous substrate into inorganic ceramic slurry and simultaneously stirring the inorganic ceramic slurry to evenly disperse the inorganic ceramic slurry on the surface of the porous substrate; drying the inorganic ceramic slurry to obtain a porous ceramic diaphragm; dipping the porous ceramic diaphragm into a glue solution and simultaneously stirring the glue solution to evenly disperse the glue solution on the surface of an inorganic ceramic coating of the porous ceramic diaphragm; and drying the glue solution to obtain the sticky ceramic diaphragm. The technology is simple. In a dipping manner, the double coated sticky ceramic diaphragm can be simultaneously formed, so that the problems of crimping, wrinkling and the like caused by secondary coating are solved; the thermal stability of the diaphragm is improved; and the yield of the product is improved. Meanwhile, an organic electrode adhesive coating is formed on the surface of a ceramic layer, so that achievement of efficiently automatic assembly is facilitated.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a viscous ceramic diaphragm and a preparation method thereof. Background technique [0002] Today, the voice of "energy-saving and low-carbon" is getting louder, the development of new energy vehicles has gradually become the trend of the contemporary automobile industry, and the research and development of various new energy technologies have sprung up. It is not only pollution-free, but also has many advantages such as high energy density, long cycle life, small self-discharge, no memory effect, wide working range, and fast charge and discharge, so it has attracted more and more attention from people. [0003] In lithium-ion batteries, power batteries have higher specific energy and specific power than communication batteries. Therefore, under abnormal conditions such as short circuit, overcharge or overdischarge, the local temperature of the battery will rise rap...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16H01M10/0525H01M50/403H01M50/434H01M50/443H01M50/446H01M50/451
CPCH01M10/052H01M50/40H01M50/403H01M50/431H01M50/411Y02E60/10
Inventor 张江伟陈成陈政伦
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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