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Ceramic diaphragm and preparation method and application thereof

A ceramic diaphragm and ceramic coating technology, applied in the direction of separator/film/diaphragm/spacer, nanotechnology for materials and surface science, nanotechnology, etc., can solve the adhesion between ceramic powder and diaphragm substrate The strength is not strong, the thermal shrinkage of the ceramic diaphragm cannot be reduced, and the ion conduction resistance of the ceramic coating is increased, so as to achieve the effect of improving thermal shrinkage resistance, excellent safety performance, and light weight

Inactive Publication Date: 2018-10-23
HUNAN UNIV OF HUMANITIES SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention provides a ceramic diaphragm and its preparation method and application, in order to solve the problem that in the prior art, the adhesion between the ceramic powder and the diaphragm base material is not strong and it is easy to fall off, and the nano-scale ceramic particles are easy to block the original microstructure of the diaphragm. The technical problems of increasing the ion conduction resistance due to the pore channels and the ceramic coating being too thin to reduce the thermal shrinkage of the ceramic separator

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  • Ceramic diaphragm and preparation method and application thereof
  • Ceramic diaphragm and preparation method and application thereof
  • Ceramic diaphragm and preparation method and application thereof

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preparation example Construction

[0047] above Na 2 Ti 3 o 7 The preparation method of nanobelts is: after ultrasonically mixing titanium dioxide powder with 10mol / L alkaline solution such as sodium hydroxide or potassium hydroxide, react in a high-pressure reactor at 150°C to 180°C for 12h to 48h, and use deionized water to Wash to neutral, filter and dry to get Na 2 Ti 3 o 7 nanobelt. The Na prepared by the above method 2 Ti 3 o 7 The nanoribbons have a uniform width of about 800 nanometers and a length ranging from a few micrometers to tens of micrometers.

[0048] above H 2 Ti 3 o 7 The preparation method of nanowires is: use 0.1mol / L~0.5mol / L acidic solution to Na 2 Ti 3 o 7 Nanobelts were soaked for 10h to 24h, and then washed with deionized water until neutral to obtain H 2 Ti 3 o 7 Nanowires. The H prepared by the above method 2 Ti 3 o 7 Nanowires have a uniform diameter of about 100 nanometers and lengths ranging from hundreds of nanometers to tens of micrometers.

[0049] The ab...

Embodiment 1

[0065] The preparation method of the ceramic diaphragm in this embodiment is as follows:

[0066] After ultrasonically mixing titanium dioxide powder and 10mol / L sodium hydroxide solution, react in an autoclave at 170°C for 36 hours, wash with deionized water until neutral, filter, and dry to obtain Na 2 Ti 3 o 7 nanobelt. The Na prepared by the above method 2 Ti 3 o 7 The nanoribbons have a uniform width of about 800 nanometers and a length ranging from a few micrometers to tens of micrometers. Na 2 Ti 3 o 7 Nanobelts, poly(vinylidene fluoride-hexafluoropropylene) and carboxymethyl cellulose are mixed with N,N-dimethylformamide in a weight ratio of 10:4:0.4:85.6, and the mechanical ball mill is used at a speed of 500rpm Ceramic slurry was obtained after ball milling for 8 hours. The ceramic slurry was uniformly coated on both sides of the PP / PE separator, the coating thickness was controlled at 0.8 μm, and the ceramic separator for lithium batteries was obtained aft...

Embodiment 2

[0070] The preparation method of the ceramic diaphragm in this embodiment is as follows:

[0071] After ultrasonically mixing titanium dioxide powder and 10mol / L sodium hydroxide solution, react in an autoclave at 160°C for 20h, wash with deionized water until neutral, filter, and dry to obtain Na 2 Ti 3 o 7 nanobelts, and then use 0.4mol / L acid to the above-prepared Na 2 Ti 3 o 7 Nanobelts were soaked for 12 h, and then washed with deionized water until neutral to obtain H 2 Ti 3 o 7 Nanowires. The H prepared by the above method 2 Ti 3 o 7 Nanowires have a uniform diameter of about 100 nanometers and lengths ranging from hundreds of nanometers to tens of micrometers. H 2 Ti 3 o 7 Nanowires, polyvinylidene fluoride, polyvinylpyrrolidone and N-methylpyrrolidone were mixed in a weight ratio of 8:0.5:0.3:91.2, and ball milled with a mechanical ball mill at a speed of 400 rpm for 4 hours to obtain a ceramic slurry. The ceramic slurry was evenly coated on one side of...

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Abstract

The invention discloses a ceramic diaphragm and a preparation method and application thereof. The ceramic diaphragm comprises a substrate and a ceramic coating attached to at least one side surface ofthe substrate. The ceramic coating contains a one-dimensional nano-material and does not contain granular ceramic powder and / or ceramic powder. The one-dimensional nano-material has the diameter of 50 nm to 500 nm and the length of 100 nanometers to 100 micrometers. The surface of one side of the substrate is not coated with the ceramic coating. Each ceramic coating has thickness of 0.1 micrometers to 2 micrometers. The ceramic diaphragm contains the one-dimensional nano-material and is difficult to be inserted into micropores of the organic diaphragm substrate so that the micropore channelsare not blocked and the conduction of lithium ions of the battery in the organic diaphragm is not blocked. The one-dimensional nano-material significantly improves the thermal stability of the ceramicdiaphragm and can improve the heat shrinkage resistance of the ceramic diaphragm even in the case of coating a very thin ceramic coating.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery diaphragms, in particular to a ceramic diaphragm and a preparation method thereof. In addition, the present invention also relates to the application of the above-mentioned ceramic diaphragm in a lithium ion battery and a battery comprising the above-mentioned 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 gradually become the most important power supply system in the field of energy storage and electric vehicles. [0003] In lithium-ion batteries, the main function of the separator is to prevent direct contact between the positive and negative electrode...

Claims

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Application Information

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IPC IPC(8): H01M2/14H01M2/16H01M10/0525B82Y30/00
CPCB82Y30/00H01M10/0525H01M50/403H01M50/409Y02E60/10
Inventor 彭秧锡陈占军田修营钟洪彬胡传跃文瑾罗飞
Owner HUNAN UNIV OF HUMANITIES SCI & TECH
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