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Preparation method of super-heat-resistant organic/inorganic composite film

An inorganic composite, super heat-resistant technology, applied in the direction of electrical components, circuits, battery pack components, etc., can solve the problems of heat resistance, influence and insignificant effect of heterogeneous multi-layer composite diaphragms

Active Publication Date: 2013-08-07
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006]Some researchers believe that the uniformity of particles in the surface coating layer is the key to affecting the heat resistance of the separator, and the uneven coating is mentioned in the patent CN 102460773 It has a significant impact on the heat resistance of the multilayer composite diaphragm. The use of ball-milled alumina can effectively improve the heat resistance, but it is still lower than expected
There is also a patent mentioning the use of plate-shaped particles to improve heat resistance. Patent 102057518A mentions a multi-layer composite film preparation method in which plate-shaped particles and polymers are dissolved in an organic solvent, coated on a support layer, and then compounded with a base film. This method can increase the heat resistance of the diaphragm to 180°C, but it has the disadvantages of not being environmentally friendly and the process is complicated. The low thermal shrinkage rate of the support layer can effectively improve the heat resistance of the composite diaphragm, and the coating layer is more to improve the composite diaphragm. Hydrophilicity
Patent CN102124591A mentions that the self-crosslinking system is selected as the adhesive to improve the heat resistance through the method of self-crosslinking and mixed plate-like particles, but the effect is not obvious, and the membrane rupture temperature of the composite membrane is around 180°C

Method used

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  • Preparation method of super-heat-resistant organic/inorganic composite film
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  • Preparation method of super-heat-resistant organic/inorganic composite film

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preparation example Construction

[0039] The embodiment of the present invention provides a method for preparing a super heat-resistant organic / inorganic composite diaphragm, which includes the following steps:

[0040] S01. Pretreatment of two-dimensional flake packing:

[0041]Dispersing the two-dimensional flake filler in ethanol, dispersing it under the action of ultrasonic vibration, washing and drying the treated two-dimensional flake filler for later use;

[0042] S02. Configuration of coating slurry:

[0043] Mix the pretreated two-dimensional flake filler with a binder solution to make a coating slurry, and the binder solution is composed of a binder and deionized water mixed in proportion; wherein, the pretreated two-dimensional flake The mass ratio of filler to binder is 1-20:1;

[0044] S03. Preparation of multilayer composite separator:

[0045] The coating slurry is coated on the surface of the polyolefin microporous diaphragm and dried to obtain a super heat-resistant organic / inorganic compos...

Embodiment 1

[0055] A method for preparing a super heat-resistant organic / inorganic composite diaphragm, comprising the steps of:

[0056] S11 Treat nano-sized zirconium phosphate and ethanol in an ultrasonic disperser with a mass ratio of 1:10 at a frequency of 5MHz for 2 hours, then reflux the pretreated powder with water for 2 hours, and dry it in an oven at 80°C for 24 hours for use.

[0057] S12 Take polyvinyl alcohol and deionized water at a mass ratio of 1:5 and stir at 70°C for 3 hours to prepare a binder solution. The pretreated powder and the binder are prepared into a coating slurry by stirring according to the mass ratio of 1:8.

[0058] S13: Soak a 20um thick dry-process PP microporous membrane in the slurry for 30 minutes, take it out and dry it in a vacuum oven at 90°C for 30 minutes to prepare a multilayer organic-inorganic composite membrane.

[0059] The heat resistance of the coated separator is better and the improvement is obvious.

Embodiment 2

[0061] A method for preparing a super heat-resistant organic / inorganic composite diaphragm, comprising the steps of:

[0062] S21 Treat micron-sized montmorillonite and ethanol in an ultrasonic disperser at a frequency of 5MHz for 2 hours at a mass ratio of 1:10, then reflux the pretreated powder with water for 3 hours, and dry it in an oven at 80°C for 24 hours for later use .

[0063] S22 Take methyl cellulose and deionized water at a mass ratio of 1:5 and stir at 70°C for 4 hours to prepare a binder solution. The pretreated powder and the binder are prepared into a coating slurry by stirring according to the mass ratio of 1:8.

[0064] S23: Soak a 25um thick dry-process PE microporous membrane in the slurry for 30 minutes, take it out and dry it in a vacuum drying oven at 90°C for 30 minutes to prepare a multilayer organic-inorganic composite membrane.

[0065] The heat resistance of the coated separator is better and the improvement is obvious.

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Abstract

The invention discloses a preparation method of a super-heat-resistant organic / inorganic composite film. According to the invention, environment-friendly and nontoxic aqueous coating slurry is prepared; with a simple coating method, a coating comprising a two-dimensional flake-structured filling material is coated on one side or two sides of a porous medium, such that a composite film suitable for high-power batteries is prepared. The preparation method has the advantages of simple process, low requirement on equipment, easy-to-control conditions, low cost, and suitability for industrialized productions. Through simple coating, dimensional stability of a common film can be effectively improved, and heat resistance of the common film can be greatly improved. The film provided by the invention can maintain high dimensional stability under 200 DEG C, such that a common film is turned into a high-performance film.

Description

technical field [0001] The invention relates to a preparation method of a super heat-resistant organic / inorganic composite diaphragm. Background technique [0002] As an important part of lithium-ion batteries, separators have attracted extensive attention from researchers. The high performance of lithium-ion batteries is closely related to the properties of separators. Especially in lithium batteries with high rate and fast charge and discharge, the performance requirements of separators are more obvious. In view of the fact that the separator has a crucial impact on the performance of the actual battery, it must have good chemical and electrochemical stability and maintain a high degree of wettability to the electrolyte during repeated charge and discharge. The interface between the separator material and the electrode The compatibility and the retention of the electrolyte by the separator have a great influence on the charge-discharge performance and cycle performance of ...

Claims

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Application Information

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IPC IPC(8): H01M2/16
CPCY02E60/12Y02E60/10
Inventor 徐睿杰雷彩红吴术球石文强胡冰蔡启莫海彬陈昌滨
Owner GUANGDONG UNIV OF TECH
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