Lithium-ion battery diaphragm with ultrathin coating layer

A technology of lithium-ion batteries and coating layers, which is applied in secondary batteries, battery pack components, circuits, etc., can solve the problems of inability to realize high-power charging and discharging, high internal resistance, etc., achieve excellent comprehensive performance, reduce thickness, and improve The effect of design capacity

Inactive Publication Date: 2020-05-19
镝普材料(深圳)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the addition of a coating on the surface of the base film, the thickness of the separator is increased. Although the puncture strength of the lithium battery is improved, the greater the thickness, the higher the internal resistance, which makes it impossible to achieve high-power charging and discharging; the demand for portable products With the increasing growth, thinner diaphragms have begun to be widely used, and higher requirements are placed on the thickness of the base film and coating

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A lithium-ion battery separator with an ultra-thin coating layer, comprising a flexible base film and coatings coated on both sides of the flexible base film, the coating is a mixture containing alumina particles, hydrotalcite and a binder, and coated The thickness of the layer is 0.8-2um.

[0027] The flexible base film is an organic base film, including: polyethylene, polypropylene, polyvinyl fluoride, polyimide non-woven fabric, etc.; the coating film slurry used for coating is composed of the following raw materials in parts by mass: 100-1000 parts by mass Solvent, 1-200 parts by mass of thickener, 10-250 parts by mass of alumina particles, 10-250 parts by mass of hydrotalcite particles, 5-100 parts by mass of binder; the solvent is water, ethanol, n-propanol, n-butyl Alcohol, isopropanol, one or a mixture of two or more in any proportion; the thickener is carboxymethyl cellulose, methyl cellulose, sodium carboxymethyl cellulose, sodium polyacrylate, polyoxyethylene...

Embodiment 2

[0030] On the basis of embodiment 1, a kind of preparation method of the lithium-ion battery separator with ultra-thin coating layer comprises the following steps:

[0031] S1. Prepare a solution with 25% solid content of hydrotalcite and deionized water, and place it in a ball mill for nanometerization;

[0032] S2, dispersing alumina and nano-sized hydrotalcite in a solvent to form a solution;

[0033] S3. Disperse the solution obtained in step S2 through a mechanical stirrer;

[0034] S4, add binder to the solution in step S3, continue to stir evenly;

[0035] S5, add thickener to the solution in step S4, continue to stir evenly;

[0036] S6, coating the above slurry on both surfaces of the porous base membrane;

[0037] S7, placing the composite film coated in step S6 in an oven to dry.

[0038] The coating method in step S6 includes roller coating method, spray coating method and doctor blade method; the drying process in step S7 is: drying at 25°C-65°C for 40-50 minu...

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PUM

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Abstract

The invention discloses a lithium-ion battery diaphragm with an ultrathin coating layer. The lithium-ion battery diaphragm comprises a flexible base film and coatings coating the two sides of the flexible base film, wherein the coatings are mixtures containing aluminum oxide particles, hydrotalcite and adhesives, and the thickness of the coatings is 0.8-2[mu]m. According to the lithium-ion batterydiaphragm with the ultrathin coating layer, the hydrotalcite inorganic material with excellent performance is added into the coating slurry, and free shuttling of lithium ions among the positive electrode, the negative electrode and the electrolyte is realized by utilizing hydrotalcite; meanwhile, by utilizing the features that the hydrotalcite has extremely strong hydrophilicity and a magnesiumaluminate crystal structure, the hydrotalcite can be coated on the two sides of the diaphragm with an extremely small size; therefore, the thickness of the coating layer of the battery diaphragm is greatly reduced, the design capacity of the lithium battery is improved; and the lithium battery diaphragm prepared by the method has the advantages of excellent comprehensive performance, mass production and the like.

Description

technical field [0001] The invention relates to the field of lithium-ion battery separators, in particular to a lithium-ion battery separator with an ultra-thin coating layer. Background technique [0002] Lithium-ion batteries (referred to as lithium batteries) are composed of positive electrodes, negative electrodes, diaphragms and electrolytes. Because lithium batteries have the advantages of high energy density, high working voltage, long cycle life and low self-discharge, they have become the main force of various electronic products and electric vehicles. Power supply, diaphragm is an important part of lithium-ion batteries. As a key material of lithium-ion batteries, the diaphragm can isolate the positive and negative electrodes after absorbing the electrolyte, prevent the battery from short-circuiting, and at the same time allow the free conduction of lithium ions. When it is high, the diaphragm blocks the conduction of current (lithium ions) by closing the pores and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M2/14H01M10/0525
CPCH01M10/0525H01M50/403H01M50/446H01M50/411H01M50/449Y02E60/10
Inventor 陈冠宏陈维林
Owner 镝普材料(深圳)有限公司
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