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Ceramic membrane, application of ceramic membrane to battery and battery comprising ceramic membrane

A ceramic diaphragm and diaphragm material technology, applied in the field of electrochemistry, can solve problems affecting the performance of ceramic diaphragms, powder dropping, and poor wetting ability of diaphragm substrates, etc.

Active Publication Date: 2013-04-10
XIAMEN UNIV +1
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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, the ceramic diaphragm can improve the affinity with the electrolyte due to powder coating, but 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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  • Ceramic membrane, application of ceramic membrane to battery and battery comprising ceramic membrane
  • Ceramic membrane, application of ceramic membrane to battery and battery comprising ceramic membrane
  • Ceramic membrane, application of ceramic membrane to battery and battery comprising ceramic membrane

Examples

Experimental program
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Effect test

Embodiment 1

[0042] Add 30ml of tetraethyl orthosilicate to 350mL of absolute ethanol at room temperature, then quickly add 30ml of water and 12ml of 14mol / L ammonia water mixture, stir and react at a speed of 200r / min for 3h to obtain a silica particle dispersion, two Silicon oxide particles are around 400nm. in N 2 Under the protection of air, add the above-mentioned nano-silica particle dispersion, deionized water and methyl acrylate monomer into the reactor with condensing device, stir for 60 minutes and start to heat up, and add an appropriate amount of persulfuric acid at 75°C Ammonium, after constant temperature for 6h, the temperature is raised to 85°C to continue the reaction for 60min, and then the temperature is lowered to obtain a silica / methyl acrylate core-shell composite. Characterized by transmission electron microscopy, the thickness of the shell layer can be controlled by adjusting the input amount of methyl acrylate monomer. 2nm-1μm. Take 4g of core-shell complex and 1...

Embodiment 2

[0051]Mix 1000ml of deionized water, 10g of titanium dioxide and 0.1g of sodium dodecylbenzenesulfonate with a particle size of 50nm in a three-necked flask with a capacity of 2000ml, under nitrogen protection, mechanically stir for 1 hour, add 0.3g of ammonium persulfate and 0.3g sodium sulfite, heat up to 80°C, add 15g butyl methacrylate, react for 2 hours, add 1.5g polyethylene glycol dimethacrylate with a molecular weight of 1500 for chemical crosslinking, continue to react for 2 hours and then stop After the reaction, the obtained product is centrifuged, washed three times with ethanol and water respectively, and dried at room temperature under vacuum conditions to obtain a titanium dioxide / butyl methacrylate core-shell complex. Take 8g of core-shell compound and 2g of polyvinylidene fluoride-hexafluoropropylene (binder) and disperse them in 100ml of acetone. 2 Coated on the polypropylene diaphragm, and after drying, the ceramic diaphragm was obtained.

Embodiment 3

[0053] Mix 3000ml of deionized water, 100g of zirconium dioxide and 1g of sodium dodecylbenzenesulfonate with a particle size of 10 μm in a three-necked flask with a capacity of 5000ml, under nitrogen protection, mechanically stir for 1 hour, add 3g of ammonium persulfate and 3g sodium sulfite, be warming up to 80 DEG C, add 100g ethylene glycol methyl methacrylate, stop reaction after reacting for 4 hours, the product that obtains is centrifuged, washes respectively three times with ethanol and water, dries under room temperature, vacuum condition, A zirconium dioxide / polyethylene glycol methyl methacrylate core-shell composite was obtained. Take 10g of core-shell composite, 0.2g of hydroxymethyl cellulose and 0.3g of styrene-butadiene rubber and disperse them in 100ml of water, coat them on a 20cm×6m polyethylene diaphragm with a small coating machine, and obtain a ceramic diaphragm after drying.

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Abstract

The invention belongs to the field of electrochemistry and in particular relates to a ceramic membrane. Particularly, the invention also relates to a ceramic membrane with a core-shell structure and prepared by substituting an organic-inorganic composite for ceramic powder. The invention further relates to application of the ceramic membrane to a chemical power supply system such as a lithium ion battery and a battery comprising the ceramic membrane. The ceramic powder with the core-shell composite structure is favorable for improvement of the electrolyte adsorbing and maintaining ability of the ceramic membrane. The ceramic membrane can serve as a high-safety membrane material of secondary batteries such as a lithium ion battery, and has excellent electrochemical performance and heat stability. According to the invention, the operability is high; the cost is low compared with that of other methods; the reproducibility is high; and the obtained product quality is stable.

Description

technical field [0001] The invention belongs to the field of electrochemistry, and in particular relates to a ceramic diaphragm. More specifically, the present invention relates to a ceramic diaphragm comprising an organic-inorganic composite with a core-shell structure as a ceramic coating, and the present invention also relates to the application of this kind of ceramic diaphragm in chemical power systems such as lithium-ion batteries and the ceramic diaphragm containing the ceramic diaphragm Battery. 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 veh...

Claims

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Application Information

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IPC IPC(8): H01M2/16
CPCY02E60/10
Inventor 赵金保张鹏杨娉婷
Owner XIAMEN UNIV
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