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Boron-containing ceramic separator as well as preparation method and application thereof

A ceramic diaphragm and diaphragm technology, applied in electrical components, electrochemical generators, circuits, etc., can solve problems such as affecting battery energy efficiency, low lithium ion migration number, and reducing lithium ion battery energy efficiency.

Active Publication Date: 2015-03-25
XIAMEN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This is because in the secondary battery, on the one hand, the migration of anions will lead to the consumption of battery energy; on the other hand, because the migration speed of anions is faster than that of lithium ions, it will cause a concentration gradient of electrolyte salt during charging and discharging, resulting in Concentration polarization, which reduces the energy efficiency of Li-ion batteries
In the existing electrolyte system, the migration number of lithium ions is low (<0.3), which greatly affects the energy efficiency of the battery

Method used

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  • Boron-containing ceramic separator as well as preparation method and application thereof
  • Boron-containing ceramic separator as well as preparation method and application thereof
  • Boron-containing ceramic separator as well as preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0059] Add 9mL of tetraethyl orthosilicate to 91mL of absolute ethanol at room temperature, then quickly add a mixture of 49.5mL of water, 18mL of 14mol / L ammonia water, 32.5mL of absolute ethanol and 0.6180g of boric acid, and stir at a speed of 200r / min After reacting for 3 hours, a boron-containing silica particle dispersion was obtained, and the silica particle was about 500 nm in size. The silicon dioxide particle dispersion is centrifuged and dried to obtain silicon dioxide powder. The powder is calcined in a muffle furnace at a high temperature of 500° C. for 6 hours to obtain calcined boron-containing silica powder. Get 1.9g of boron-containing silica powder, 1.9g of carboxymethylcellulose (CMC) with a mass fraction of 2%, and 0.12g of styrene-butadiene rubber (SBR) with a mass fraction of 50% and disperse them in 10mL of deionized water and In a mixed solvent of 10mL absolute ethanol, coat a 20cm×6m polyethylene diaphragm on a small coating machine, and obtain a cera...

Embodiment 2

[0071] Stir vigorously under an ice-water bath, drop titanium tetrachloride into distilled water, add dropwise an aqueous solution dissolved in ammonium sulfate and concentrated hydrochloric acid into the obtained titanium tetrachloride solution, stir, and control the temperature of the mixing process below 15°C. Lithium tetraborate was then added, and the temperature was raised to 95° C. for 1 hour, and then concentrated ammonia water was added to adjust the pH value to about 6. Cool to room temperature and age for 12 hours to obtain boron-containing titanium dioxide particle dispersion, the titanium dioxide particle size is about 5nm. The titanium dioxide ion dispersion liquid is filtered, washed, dried, and then placed in a muffle furnace for calcination at a high temperature of 500° C. for 6 hours to obtain calcined boron-containing titanium dioxide powder. Take 4g of boron-containing titanium dioxide powder and 1g of vinylidene fluoride (binder) and disperse them in 50ml ...

Embodiment 3

[0073] Aluminum isopropoxide is dissolved in isopropanol to make aluminum alkoxide phase; deionized water, nitric acid and isopropanol are mixed to make water phase. The aluminum alkoxide phase and the water phase are simultaneously added dropwise into a reaction vessel filled with isopropanol, stirred, and the aluminum isopropoxide is hydrolyzed. Sodium tetraborate was then added. The gel is dried to form hydrated alumina, and then calcined at 750°C to obtain boron-containing alumina powder, the powder is about 10nm. Take 8g of boron-containing alumina powder 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.

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Abstract

The invention discloses a boron-containing ceramic separator as well as a preparation method and an application thereof and relates to a ceramic separator. The boron-containing ceramic separator comprises a separator substrate of which the surface is coated with a protective layer, wherein the main component of the protective layer is a boron-containing inorganic substance. The preparation method comprises the following steps: adding tetraethylorthosilicate into anhydrous ethanol, adding a mixed liquid of water, ammonia water, anhydrous ethanol and boric acid and reacting to obtain a boron-containing silicon dioxide particle dispersion liquid; centrifuging and drying the boron-containing silicon dioxide particle dispersion liquid to obtain silicon dioxide powder, and calcining the silicon dioxide powder to obtain boron-containing silicon dioxide powder; and dispersing the boron-containing silicon dioxide powder, carboxymethyl cellulose and styrene butadiene rubber in a mixed solvent of deionized water and anhydrous ethanol, coating a polyethylene separator with the liquid and drying to obtain the boron-containing ceramic separator. The boron-containing ceramic separator can be used as a separator in the preparation of a cell.

Description

technical field [0001] The invention relates to a ceramic diaphragm, in particular to a boron-containing ceramic diaphragm and its preparation method and application. 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, the separators used in commercial lithium-ion batteries are mainly polyolefin separator materials with microporous stru...

Claims

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Application Information

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IPC IPC(8): H01M2/16H01M10/0525H01M50/434
CPCH01M10/0525H01M50/403H01M50/449Y02E60/10
Inventor 赵金保杨娉婷张鹏
Owner XIAMEN UNIV