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Spraying preparation method for polydopamine ceramic diaphragm and application thereof in lithium ion battery

A technology of ceramic diaphragm and polydopamine, applied in the field of electrochemistry, can solve the problems of low utilization rate, cumbersome process, and large dosage of dopamine

Inactive Publication Date: 2017-05-31
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the dopamine ceramic diaphragm synthesized by the existing method consumes a large amount of dopamine, has a low utilization rate, and has a cumbersome process.

Method used

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  • Spraying preparation method for polydopamine ceramic diaphragm and application thereof in lithium ion battery
  • Spraying preparation method for polydopamine ceramic diaphragm and application thereof in lithium ion battery
  • Spraying preparation method for polydopamine ceramic diaphragm and application thereof in lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] With commercial ceramic separator (base film: PE, ceramic layer: TiO 2 ) as a ceramic diaphragm substrate. Put 5 parts by mass of dopamine hydrochloride into a mixed solution (water-based solvent) of 95 parts by mass of deionized water and ethanol (1:2, v:v), and adjust the pH to 8.5. Use the obtained mixed solution to spray on the surface of commercial ceramic diaphragm at a speed of 1ml / min. The sprayed diaphragm was aged at 25°C for 8 hours, washed with a water-based solvent to remove impurities, and dried to remove the solvent to obtain a modified polydopamine ceramic diaphragm with a coating amount of polydopamine of 0.1g / m 2 ~10g / m 2 .

[0050] figure 1 It is a scanning electron microscope photo of the modified polydopamine ceramic diaphragm of Example 1, from which it can be clearly observed that polydopamine is evenly coated on the surface of the ceramic diaphragm.

[0051] figure 2 is the contact angle test chart of commercial ceramic separator and modif...

Embodiment 2

[0053] With commercial ceramic separator (base membrane: polyamide, ceramic layer: Al 2 o 3 ) as a ceramic diaphragm substrate. Put 3 parts by mass of dopamine hydrochloride and 1 part by mass of hydroxyethyl cellulose into a mixed solution (water-based solvent) of 96 parts by weight of deionized water and acetone (1:1, v:v), adjust the pH to 8 . Using the resulting mixed solution, spray a commercial ceramic diaphragm at a rate of 2 ml / min. The sprayed diaphragm was aged at 35°C for 7 hours, washed with a water-based solvent to remove impurities, and dried to remove the solvent to obtain a modified polydopamine ceramic diaphragm, and the coating amount of polydopamine was 0.1g / m 2 ~10g / m 2 .

[0054] image 3 It is a comparison chart of commercial ceramic diaphragms and polydopamine ceramic diaphragms before and after heat treatment at 200°C for 30 minutes. As can be seen from the figure, after heat treatment at 200°C for 30 minutes, the commercial ceramic diaphragm has...

Embodiment 3

[0056]A commercial ceramic separator (base film: polyester, ceramic layer: CuO) was used as the ceramic separator substrate. Put 1.5 parts by mass of dopamine hydrochloride and 0.5 parts by mass of styrene-butadiene rubber into a mixed solution (water-based solvent) of 98 parts by weight of deionized water and acetone (1:1, v:v). With the resulting mixed solution, a commercial ceramic diaphragm was sprayed at a rate of 3 ml / min. Aging the sprayed diaphragm for 3 hours in an atmosphere of pH=8, washing away impurities with a water-based solvent, drying to remove the solvent, and obtaining a modified polydopamine ceramic diaphragm, the coating amount of polydopamine is 0.1g / m 2 ~10g / m 2 .

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PUM

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Abstract

The invention discloses a spraying preparation method for a polydopamine ceramic diaphragm and application thereof in a lithium ion battery. The method comprises the following steps: dissolving 0.1-20 weight parts of dopamine hydrochloride and 0-5 weight parts of thickening agent in 75-99.9 weight parts of water-based solvent; adjusting the pH of the mixed solution to 6-12; spraying on the surface of a commercial ceramic diaphragm and ageing or spraying the mixed solution on the surface of the commercial ceramic diaphragm and ageing in alkaline atmosphere; and fully polymerizing dopamine, thereby acquiring the polydopamine ceramic diaphragm. According to the preparation method provided by the invention, the use ratio of the dopamine is increased; the operation is simple and convenient; the industrial production is easy; the prepared polydopamine ceramic diaphragm has excellent wettability; the mechanical strength is high after the polydopamine ceramic diaphragm is subjected to thermal treatment; when the polydopamine ceramic diaphragm is applied to a battery, the cycle performance of the battery is improved.

Description

technical field [0001] The invention belongs to the field of electrochemistry, and in particular relates to the preparation of a polydopamine ceramic diaphragm by a spray coating method and a battery containing the ceramic diaphragm. Background technique [0002] As a chemical power system with high energy density, high output voltage, no memory effect, excellent cycle performance, and environmental friendliness, lithium-ion battery has good economic benefits, social benefits and strategic significance, and has been widely used in mobile communications, Digital products and other fields, and it is very likely to become the most important power supply system in the field of energy storage and electric vehicles. [0003] In lithium-ion batteries, the separator mainly plays the role of preventing positive and negative electrodes from contacting and allowing ion conduction, and is an important part of the battery. At present, commercial lithium-ion batteries mainly use polyolef...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16H01M10/0525
CPCH01M10/0525H01M50/40H01M50/403H01M50/409H01M50/411H01M50/449Y02E60/10
Inventor 赵金保张鹏彭龙庆戴建辉
Owner XIAMEN UNIV