Preparation method for poly-dopamine modified ceramic particle nonwoven diaphragm

A non-woven separator, ceramic particle technology, applied in electrical components, circuits, battery pack components, etc., can solve the problems of poor heat resistance of polyolefin, reduce safety risks, lose protection functions, etc., and improve adhesion. , to avoid easy falling off, the effect of improving safety performance

Inactive Publication Date: 2016-03-09
CHINA FIRST AUTOMOBILE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current commercialized polyolefin microporous separators tend to melt and close the micropores when the battery temperature is too high, blocking the transmission of electrolyte ions, thereby reducing safety risks; but the heat resistance of polyolefin itself is poor. If it rises sharply, it will lose its protective function, which will increase the potential safety hazards sharply.

Method used

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  • Preparation method for poly-dopamine modified ceramic particle nonwoven diaphragm
  • Preparation method for poly-dopamine modified ceramic particle nonwoven diaphragm
  • Preparation method for poly-dopamine modified ceramic particle nonwoven diaphragm

Examples

Experimental program
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Effect test

Embodiment 1

[0019] (1) 2.0g SiO with a particle size of 20nm 2 The particles were stirred in 200mL dopamine solution with a concentration of 0.5g / L, soaked for 10h, taken out, filtered and dried to obtain polydopamine modified ceramic particles SiO 2 (2) Weigh 5.0g of PVDF-HFP with a weight average molecular weight of 400,000, add 40g of DMF, stir well, then add 2.0g of modified SiO in (1) 2 , stirring at high speed for 5 hours; (3) Add 3.5g of n-butanol to (2), and continue to stir for 2 hours; (4) Cast the colloid mixture in step (3) on the non-woven fabric, and cast and scrape it into (5) Remove the membrane, roll a thick composite diaphragm to a thickness of 28 μm, and dry it in vacuum at 75°C for 8 hours to obtain polydopamine-modified SiO 2 / Non-woven separator. The diaphragm prepared in this example has good heat resistance, and the TG experimental curve is shown in figure 1 , 2 .

[0020]

Embodiment 2

[0022] (1) 2.0g Al with a particle size of 30nm 2 o 3 The particles were stirred in 200 mL of dopamine solution with a concentration of 2.0 g / L, soaked for 24 hours, taken out, filtered and dried to obtain polydopamine modified ceramic particles Al 2 o 3 (2) Weigh 5.0g of PVDF-HFP with a weight average molecular weight of 500,000, add 50g of acetone, stir well, add 16g of modified Al in (1) 2 o 3 , stirring vigorously for 6 hours; (3) Add 4.75g of absolute ethanol to (2), and continue to stir for 2 hours; (4) Cast the colloid mixture in step (3) on the non-woven fabric, and cast and scrape it into (5) Remove the membrane, roll a thick composite diaphragm to a thickness of 45 μm, and dry it in vacuum at 50°C for 2 hours to obtain polydopamine-modified Al 2 o 3 / Non-woven separator.

Embodiment 3

[0024] (1) 2.0g ZrO with a particle size of 120nm 2 The particles were stirred in 100 mL of dopamine solution with a concentration of 1.5 g / L, soaked for 24 hours, then taken out, filtered, and dried to obtain polydopamine-modified ceramic particles ZrO 2 ; (2) Weigh 3.0g PVDF with a weight average molecular weight of 400,000, add 20g acetone and 12gDMF to the mixed solvent, stir evenly, add 0.5g (1) modified ZrO 2 , vigorously stirred for 5 hours; (3) Add 4.0g of deionized water to (2), and continue to stir for 2 hours; (4) Cast the colloid mixture in step (3) on the non-woven fabric, cast and scrape it into (5) Remove the membrane, roll a thick composite diaphragm to a thickness of 40 μm, and dry it in vacuum at 70°C for 8 hours to obtain polydopamine-modified ZrO 2 / Non-woven separator. The diaphragm prepared in this example has better wettability, see image 3 .

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Abstract

The invention relates to a preparation method for a poly-dopamine modified ceramic particle nonwoven diaphragm. The method is characterized by comprising the following concrete steps of: a) soaking ceramic particles in a dopamine solution with the concentration of 0.5-2.0g/L for 10-24 hours, and performing suction filtration and evaporation to dryness to obtain poly-dopamine modified ceramic particle powder, wherein a mass ratio of poly-dopamine to ceramic particles is 0.05-0.2; meanwhile, b) treating a nonwoven diaphragm with a mixed solution containing an organic binder, an organic solvent, modified ceramic powder and a hole former; and c) performing grinding and vacuum drying on a diaphragm obtained in the step b) to obtain the poly-dopamine modified ceramic particle nonwoven diaphragm, wherein the vacuum drying temperature is 50-75 DEG C. The poly-dopamine modified ceramic particle nonwoven diaphragm has good flame resistance and heat resistance and high liquid absorption rate and mechanical performance. A lithium ion battery assembled by the diaphragm is greatly improved in safety performance.

Description

technical field [0001] The invention relates to a preparation method of polydopamine-treated ceramic particles modified non-woven fabric diaphragm, which belongs to the field of batteries and capacitors. Background technique [0002] Lithium-ion batteries have become ideal power batteries for new energy vehicles because of their advantages such as high specific energy, high working voltage, low self-discharge, and environmental friendliness. However, due to the use of liquid electrolyte solution, there are potential safety hazards in lithium-ion batteries, which limits its large-scale promotion in automobiles. As one of the key components of lithium batteries, the separator will directly affect the capacity, cycle performance and safety performance of the battery. [0003] The separator between the positive and negative electrodes has an electrolyte ion transmission channel, which prevents the short circuit of the positive and negative electrodes. However, the current comme...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M50/403H01M50/429H01M50/434H01M50/489
CPCH01M50/403Y02E60/10
Inventor 于力娜王丹赵中令韩建张克金刁洪军
Owner CHINA FIRST AUTOMOBILE
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