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A ceramic composite diaphragm with thermal shutdown function and its application

A ceramic composite, thermal shutdown technology, applied in the field of lithium-ion batteries, can solve the problems of poor uniformity, leakage, powder drop, etc., and achieve the effect of increasing the surface area and improving the wettability

Active Publication Date: 2017-09-08
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the large specific surface energy of ceramic powder, it is easy to agglomerate, and its surface is generally hydrophilic, while the polyolefin film is a hydrophobic material. Therefore, from most research reports, the uniformity of ceramic powder coating Poor, there is obvious "powder falling" phenomenon, which will greatly affect the performance of ceramic separators in lithium-ion batteries
In addition, although the powder coating of the ceramic diaphragm can improve the affinity with the electrolyte, due to the poor wetting ability of the diaphragm substrate itself and the electrolyte, the existing ceramic diaphragm still has a certain risk of leakage.

Method used

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  • A ceramic composite diaphragm with thermal shutdown function and its application
  • A ceramic composite diaphragm with thermal shutdown function and its application
  • A ceramic composite diaphragm with thermal shutdown function and its application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Add 30mL tetraethyl orthosilicate to 350mL absolute ethanol at room temperature, then quickly add 30mL water and 12mL 14mol / L ammonia water mixture, stir and react at a speed of 200r / min for 3h to obtain a silica particle dispersion, Silica particles are around 400nm. Dissolve 0.1 g of silicon dioxide and 0.25 g of polyethylene solution (40% solid content) into 1 L of aqueous solution, and mechanically stir for 10 h to obtain a uniform mixed solution. Spray drying to obtain core-shell structure particles with silicon oxide as the core and polyethylene as the shell. Characterized by transmission electron microscopy, the thickness of the shell layer can be controlled at 2nm-1μm by adjusting the input amount of polyethylene emulsion. Take 0.2g of core-shell particles and 0.1g of vinylidene fluoride (binder) and disperse them in 50mL of N-methylpyrrolidone. 2 Coated on the polyethylene separator, and after drying, a ceramic composite separator with thermal shutdown functi...

Embodiment 2

[0055] Dissolve 1 g of aluminum oxide and 2.50 g of polypropylene solution (45% solid content) into 10 L of aqueous solution, and mechanically stir for 15 h to obtain a uniform mixed solution. Spray drying to obtain core-shell structure particles with aluminum oxide as the core and polypropylene as the shell. Take 0.8g of core-shell structure particles, 0.2g of polyvinylidene fluoride-hexafluoropropylene (binder) and disperse in 100mL of acetone, and use casting method in 1m 2 Coated on the polypropylene diaphragm, and after drying, a ceramic composite diaphragm with thermal shutdown function is obtained.

Embodiment 3

[0057] Dissolve 10 g of magnesium oxide and 25 g of polyethylene-propylene solution (50% solid content) into 100 L of aqueous solution, and mechanically stir for 20 h to obtain a uniform mixed solution. Spray drying to obtain core-shell structure particles with magnesium oxide as the core and polyethylene-propylene copolymer as the shell. Take 10g of core-shell structure particles, 0.2g of hydroxymethyl cellulose and 0.3g of styrene-butadiene rubber and disperse them in 100mL of water, and coat them on a 20cm×6m polyethylene diaphragm on a small coating machine. Break function ceramic composite diaphragm.

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Abstract

The invention discloses a ceramic composite diaphragm with thermal shutdown function and its application. The ceramic composite diaphragm comprises a diaphragm base material and a protective layer with a thickness of 0.5-20 μm coated on the surface of the diaphragm base material. The protective layer has an effective The composition includes core-shell structure particles with inorganic substances as the core and polyolefin or paraffin polymer as the shell. The particle size of the above core is 5nm to 10μm, the thickness of the shell is 1nm to 10μm, and the molecular weight of the above polyolefin is 5000 ~5000000. The protective layer of the ceramic composite diaphragm with thermal shutdown function of the present invention can greatly increase the surface area of ​​the particles, thereby significantly improving the wettability of the diaphragm, and at the same time, the core-shell structure particles can also melt at a preset temperature to form a dense layer , to achieve the effect of blocking the conduction of lithium ions.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a ceramic composite diaphragm with a thermal shutdown function and an application thereof. 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 polyolefin diaphragm materia...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M2/16H01M10/0525H01M50/446H01M50/449
CPCH01M10/0525H01M50/446Y02E60/10
Inventor 赵金保石川戴建辉张鹏
Owner XIAMEN UNIV
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