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Lithium ion battery alumina hydrate coating membrane and preparation method thereof

A technology of hydrated alumina and lithium-ion batteries, which is applied to battery pack parts, circuits, electrical components, etc., can solve the problem of not being able to significantly improve the physical indicators and electrochemical performance, heat resistance, and puncture strength of lithium-ion batteries. Poor production operability and other problems, to achieve the effect of strong production operability, improved electrochemical performance, and improved electrochemical performance

Inactive Publication Date: 2016-09-07
湖南锂顺能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the separators on the market are not high in safety, poor in heat resistance, puncture strength, liquid retention, etc., and cannot significantly improve the physical indicators and electrochemical properties of lithium-ion batteries. Operability is not strong

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] In the lithium-ion battery monohydrate-coated separator of this embodiment, the surface of the lithium-ion battery separator is coated with a monohydrate alumina slurry.

[0030] In this embodiment, the coating thickness of the monohydrate alumina slurry on the surface of the lithium-ion battery separator is controlled at 3 microns.

[0031] In this embodiment, the alumina monohydrate slurry is made of the following raw materials in mass percentage: 1.0% surfactant, 0.5% thickener, 12.0% binder, 0.5% dispersant, 20.0% alumina monohydrate %, defoamer 4.0%, solvent 62.0%;

[0032] The alumina monohydrate is nano-scale alumina monohydrate particles.

[0033] In this embodiment, the particle size of the alumina monohydrate is 300-400 nm.

[0034] In the present embodiment, the surfactant is fatty acid glyceride; the thickener is sodium carboxymethyl cellulose; the binder is battery grade LA132; the dispersant is TH-904 dispersant; The antifoaming agent is alcohol; the so...

Embodiment 2

[0044] In the lithium-ion battery monohydrate-coated separator of this embodiment, the surface of the lithium-ion battery separator is coated with a monohydrate alumina slurry.

[0045] In this embodiment, the thickness of the one-sided coating of the alumina monohydrate slurry on the surface of the lithium-ion battery separator is controlled at 4 microns.

[0046] In this embodiment, the alumina monohydrate slurry is made of the following raw materials in mass percentage: 1.5% surfactant, 0.5% thickener, 13.0% binder, 0.5% dispersant, 20.0% alumina monohydrate %, defoamer 5.5%, solvent 59.0%;

[0047] The alumina monohydrate is nano-scale alumina monohydrate particles.

[0048] In this embodiment, the particle size of the alumina monohydrate is 400-500 nm.

[0049]In the present embodiment, the surfactant is a mixed surfactant of sorbitan fatty acid and polysorbate; the thickener is a mixed thickener of carboxymethyl cellulose and xanthan gum; the binding agent It is a bat...

Embodiment 3

[0059] In the lithium-ion battery monohydrate-coated separator of this embodiment, the surface of the lithium-ion battery separator is coated with a monohydrate alumina slurry.

[0060] In this embodiment, the coating thickness of the monohydrate alumina slurry on the surface of the lithium-ion battery separator is controlled at 5 microns.

[0061] In this example, the alumina monohydrate slurry is made of the following raw materials in mass percentage: 0.8% surfactant, 1.2% thickener, 14.0% binder, 0.5% dispersant, 27.0% alumina monohydrate %, defoamer 4.5%, solvent 52.0%;

[0062] The alumina monohydrate is nano-scale alumina monohydrate particles.

[0063] In this embodiment, the particle size of the alumina monohydrate is 600-700 nm.

[0064] In the present embodiment, the surfactant is a mixed surfactant of polysorbate and polyethylene glycol monooctyl phenyl ether; the thickener is gelatin; the binder is battery grade LA133; The dispersant is BYK-W965 dispersant; the ...

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Abstract

The invention belongs to the field of lithium ion battery materials, and discloses a lithium ion battery alumina hydrate coating membrane and preparation method thereof. The alumina hydrate slurry is coated on the surface of the lithium ion battery membrane. The preparation method comprises the following steps: mixing nano-level alumina hydrate, surfactant, thickening agent, adhesive, dispersing agent, defoaming agent and solvent, stirring, using a coating device to uniformly coat the slurry on the frontage and the back surface of the lithium ion battery membrane so as to form the coating layer, drying the coating layer to obtain the lithium ion battery alumina hydrate coating membrane, winding and sealing to store. Besides the high security of the coating membrane, the heat resistance, puncture strength, and the electrolyte retention of the lithium ion battery membrane are improved, the electrochemical property of the lithium ion battery can be obviously improved, and the production operability is strong.

Description

technical field [0001] The invention belongs to the field of lithium-ion battery materials, and relates to a lithium-ion battery monohydrate alumina-coated diaphragm and a preparation method thereof. Background technique [0002] my country is the world's largest lithium-ion battery production base and the second largest lithium-ion battery production and exporter. Lithium-ion batteries have accounted for 40-50% of the global market share. my country's demand for lithium-ion battery separators is increasing day by day. According to the statistics of China Chemical and Physical Lithium-ion Battery Industry Association, the demand for separators in my country reached 800 million square meters in 2015, and it is estimated that the demand for separators in my country will exceed 1.4 billion square meters in 2016. 80% of my country's high-end diaphragms rely on imports. Therefore, the market potential for high-quality, high-safety new diaphragm materials is huge. [0003] At pre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M2/14H01M50/403H01M50/431H01M50/449H01M50/489
CPCH01M50/403H01M50/449Y02E60/10
Inventor 何鹏飞沈智郑拥军李勇邓彬周间卿
Owner 湖南锂顺能源科技有限公司
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