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A lithium-ion battery separator modified by polydopamine and its preparation method

A lithium-ion battery and polydopamine technology, which is applied to battery components, separators/films/diaphragms/spacers, circuits, etc., to improve ion transmission capacity, large application potential, and environmental friendliness

Inactive Publication Date: 2016-01-20
CHINA FIRST AUTOMOBILE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Polydopamine substance is the main active ingredient of the viscous substance secreted by the outer skin of shellfish. It is reported that dopamine can significantly modify the surface properties of objects, and the adhesion between the dopamine-modified layer and the substrate is extremely strong. In recent years, it has been widely used in the field of surface modification [CN101864670B, CN102061479A]. There is no report in the field of battery separator modification

Method used

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  • A lithium-ion battery separator modified by polydopamine and its preparation method
  • A lithium-ion battery separator modified by polydopamine and its preparation method
  • A lithium-ion battery separator modified by polydopamine and its preparation method

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Experimental program
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Effect test

Embodiment 1

[0020] Using DMF / water (volume ratio 4 / 1) as solvent, the preparation concentration is 100mmol L -1 dopamine solution, adding 0.1% by mass of graphene oxide; sodium acetate solution (1mol L -1 ) to adjust the pH to 8.5. Thickness of 10μm polyethylene diaphragm sample film 100cm 2 Immerse in 0.1kg of the above-mentioned mixed solution, at room temperature, under 10kHz, 500W ultrasound, let it stand for 2 hours, take it out, rinse it with deionized water, then repeat the test process 10 times, then place it in an argon atmosphere, and dry it at 60°C for 24 hours. That is, a modified diaphragm is obtained.

Embodiment 2

[0022] Use ethanol / water (volume ratio 1 / 4) as the solvent, and prepare the concentration at 1mmol L -1 dopamine solution, adding 10% by mass of graphene oxide; sodium acetate solution (1mol L -1 ) to adjust the pH to 8.5. Use a scraper to scrape 1kg of the mixture on 1m 2 , the surface of a polypropylene diaphragm sample with a thickness of 25 μm, and then placed in a closed container, and then the system was placed on a shaker, oscillating at a frequency of 10r / min at room temperature for 48h, then taken out, rinsed with deionized water, and then placed in a vacuum condition , dried at 100°C for 12 hours to obtain a modified separator.

Embodiment 3

[0024] Using acetone / water (volume ratio 1 / 2) as solvent, prepare a dopamine solution with a concentration of 1000mmol L-1, and add 1% graphene oxide by mass at the same time; adjust with sodium acetate solution (1mol L-1) pH to 11. Pour 5kg of mixed solution on 10m 2 , The surface of the PET membrane sample with a thickness of 100 μm, and then placed in a closed container, and then the system was placed on a shaker, oscillating at a frequency of 300r / min at room temperature, taken out after 6 hours at room temperature, rinsed with deionized water and placed in a vacuum condition 100°C for 6 hours, and then repeat the above process ten times to obtain a modified separator.

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Abstract

The invention discloses a preparation method of a polydopamine-modified lithium-ion battery diaphragm. The modification method is to form a film on the surface and inside of the polymer matrix through the self-polymerization of the dopamine monomer. The modified diaphragm obtained by this method has the advantages of stronger liquid absorption / retaining ability, outstanding rate performance, etc. The lithium ion battery using it as the diaphragm has the advantages of high electrolyte ion conductivity and excellent battery cycle performance, and is especially suitable for The field of power lithium-ion batteries.

Description

technical field [0001] The invention relates to a lithium-ion battery diaphragm modified by polydopamine and a preparation method thereof, in particular to a preparation method applicable to a lithium-ion power battery diaphragm. Background technique [0002] Diaphragm materials, especially lithium-ion battery diaphragm materials, belong to the core technology of batteries. At present, battery separators with superior performance are mainly controlled by the United States, Japan, South Korea and other countries, so it is necessary to develop new separators with independent intellectual property rights. The traditional diaphragm is limited by the material, and its affinity for the electrolyte is not strong, resulting in a weak liquid absorption / retaining ability, which affects the rate performance of the battery during charge and discharge. Patent CN1554695A coats a layer of polyvinylidene fluoride-hexafluoropropylene copolymer (PVDF-HFP) on the surface of the polyolefin dia...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M2/16H01M50/429H01M50/431H01M50/497
CPCH01M50/409H01M50/403Y02E60/10
Inventor 王丹赵中令张克金应善强姜涛于力娜王金兴
Owner CHINA FIRST AUTOMOBILE
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