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A kind of preparation method of organic/inorganic composite diaphragm of coating type lithium battery

An inorganic composite and lithium battery technology, which is applied to battery components, circuits, electrical components, etc., can solve problems such as difficult to degrade, residue discharge, and residual material stacking

Active Publication Date: 2016-06-29
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, at present, in the coated polymer separator, it is advocated to use synthetic polymer as the binder, which inevitably has defects such as residue discharge, residual material accumulation, and difficulty in degradation, and there are still huge defects in environmental protection and rational utilization of resources. , thus further improving the composition of the coating formula has far-reaching significance

Method used

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  • A kind of preparation method of organic/inorganic composite diaphragm of coating type lithium battery
  • A kind of preparation method of organic/inorganic composite diaphragm of coating type lithium battery

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preparation example Construction

[0032] An embodiment of the present invention provides a method for preparing a coated lithium battery organic / inorganic composite separator, comprising the following steps:

[0033] S01. Configuration of polymer powder pre-dispersion:

[0034] The polymer powder is dispersed in water, and ground in a grinder for a certain period of time to form a polymer powder pre-dispersion.

[0035] S02. Configuration of coating slurry:

[0036] Mixing the polymer powder pre-dispersion with the binder solution to prepare a coating slurry; wherein the mass ratio of the polymer powder to the binder is 5-40:1;

[0037] S03. Preparation of organic / inorganic composite separator:

[0038] The coating slurry is coated on the surface of the polyolefin microporous membrane and dried to obtain the lithium battery organic / inorganic composite membrane.

[0039] In this way, the preparation method of the above-mentioned multi-layer composite diaphragm disperses the polymer powder in the water-solubl...

Embodiment 1

[0049] A preparation method of a lithium-ion battery diaphragm, comprising the steps of:

[0050] S11 Grind nano-sized polyvinylidene fluoride and water with a grinder for 13 hours at a mass ratio of 1:20, and the average particle size of the polymer powder after grinding is 800 nanometers;

[0051] S12 Stir gelatin and deionized water at a mass ratio of 1:9 at 70°C for 3 hours to form a binder. The mass ratio of the pretreated polymer powder to the binder is 14:1 and is configured into a coating slurry by stirring.

[0052] S13: Soak a 20um thick dry-process PP microporous membrane in the slurry for 5 minutes, take it out and dry it in a vacuum oven at 90°C for 30 minutes to prepare an organic-inorganic composite separator.

[0053] The surface of the coated diaphragm is smooth and the improvement is obvious.

Embodiment 2

[0055] A preparation method of a lithium-ion battery diaphragm, comprising the steps of:

[0056] S21 Grind the micron-sized polyvinylidene fluoride-hexafluoropropylene copolymer and water in a grinder for 7 hours at a mass ratio of 1:1, and the average particle size of the polymer powder after grinding is 1200 nanometers;

[0057] S22 Take bone glue and deionized water at a mass ratio of 1:9 and stir at 70°C for 6 hours to form a binder. The mass ratio of the pretreated polymer powder to the binder is 39:1 and is configured into a coating slurry by stirring.

[0058] S23: Soak a 25um thick dry-process PE microporous membrane in the slurry for 5 minutes, take it out and dry it in a vacuum oven at 90°C for 30 minutes to prepare an organic-inorganic composite separator.

[0059] The surface of the coated diaphragm is smooth and the improvement is obvious.

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Abstract

The invention discloses a method for preparing a coated lithium battery organic / inorganic composite diaphragm. In the method, biological glue is used as a binder to coat one or both sides of the surface of a polyolefin microporous diaphragm through a simple coating method. Coating electrophilic polymer powder to prepare electrophilic battery separator with high liquid absorption rate; the preparation method has simple process, low equipment requirements, easy control of conditions, green environmental protection, low cost, and is suitable for industrial production; through simple coating It can effectively improve the electrophilic performance of ordinary diaphragms, greatly improve the performance of ordinary diaphragms, and realize the high performance of ordinary diaphragms.

Description

technical field [0001] The invention belongs to the technical field of high-performance diaphragm preparation for lithium battery diaphragms, and in particular relates to a method for preparing a coated lithium battery 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 retent...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M2/16H01M50/403H01M50/446H01M50/489
CPCH01M50/403H01M50/411H01M50/449Y02E60/10
Inventor 雷彩红黄晓蕊徐睿杰蔡启陈贤德张丰陈昌滨莫海彬
Owner GUANGDONG UNIV OF TECH
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