Ceramic diaphragm taking aerogel as powder body, and applications of ceramic diaphragm in lithium ion battery

A ceramic diaphragm and airgel technology, which is applied in secondary batteries, battery pack components, circuits, etc., can solve problems affecting the performance of ceramic diaphragms, poor uniformity, powder drop, etc., and achieve excellent thermal stability and low cost , the effect of low thermal conductivity

Inactive Publication Date: 2017-05-31
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, according to research reports, the uniformity of ceramic powder coating is poor , there is an obvious "powder dropping" phenomenon, which will greatly affect the performance of ceramic separators in lithium-ion batteries

Method used

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  • Ceramic diaphragm taking aerogel as powder body, and applications of ceramic diaphragm in lithium ion battery
  • Ceramic diaphragm taking aerogel as powder body, and applications of ceramic diaphragm in lithium ion battery
  • Ceramic diaphragm taking aerogel as powder body, and applications of ceramic diaphragm in lithium ion battery

Examples

Experimental program
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Effect test

Embodiment 1

[0035] Add 8ml tetraethyl orthosilicate and 10.5ml absolute ethanol in the round bottom flask, adjust the pH value of the system to 2 with concentrated hydrochloric acid after mixing, then add 5ml of distilled water (distilled water The molar ratio is about 1:5:8), stirred and refluxed at 60°C for 90 minutes to fully hydrolyze the tetraethyl orthosilicate, and then adjust the pH to 8 with 1mol / L ammonia solution to accelerate the hydrolysis of the tetraethyl orthosilicate Polycondensation reaction occurs to obtain SiO 2 alcohol gel. The obtained alcohol gel was soaked in absolute ethanol at 60°C and ethanol solution of ethyl orthosilicate at 70°C (the volume ratio of ethyl orthosilicate to ethanol was 1:5) for 24h and 48h respectively. SiO can be obtained by drying at a constant temperature of 70°C for 72 hours 2 Airgel products. The resulting SiO 2 Airgel is a milky white translucent uniform block. figure 1 Transmission electron micrographs of the obtained airgel. The s...

Embodiment 2

[0038] Titanium dioxide airgel prepared by supercritical carbon dioxide method is used as powder, and polyvinylidene fluoride is used as binder to disperse in N-methylpyrrolidone. Double-sided coating is carried out on the polypropylene diaphragm at a speed of 2m / min, and a ceramic diaphragm is obtained after drying.

Embodiment 3

[0040] The silica airgel prepared by supercritical carbon dioxide method is used as powder, and polyvinylidene fluoride is used as binder to disperse in dimethylformamide. After dispersing for 5 hours under mechanical stirring conditions, it is coated on GTB780 Double-sided coating is carried out on the vinylidene fluoride-hexafluoropropylene copolymer film at a speed of 2m / min on the machine, and a ceramic diaphragm is obtained after drying.

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Abstract

The invention provides a ceramic diaphragm taking aerogel as a powder body, and applications of the ceramic diaphragm in a lithium ion battery, relating to a lithium ion battery diaphragm. The ceramic diaphragm takes aerogel as the ceramic powder body which is coated on the diaphragm to form a ceramic diaphragm. The ceramic diaphragm taking aerogel as the powder body can be applied to batteries. The batteries include non-aqueous electrolyte secondary batteries and the like; each battery comprises an anode material, a cathode material and a ceramic diaphragm taking aerogel as a powder body, and the ceramic diaphragm taking aerogel as a powder body is arranged between the anode material and the cathode material. Aerogel is a lightweight nanometer mesoporous noncrystaline material formed by crosslinking of atom clusters, the porosity is up to 80%, the specific surface area is up to 800-1000m<2>/g, the aerogel has the characteristics of being excellent in transparency, extremely low heat conductivity, resistant to high temperature, low in density and the like. The ceramic diaphragm can be used as a highly safety diaphragm material of secondary batteries such as lithium ion batteries, and has excellent thermal stability and electrochemical performances.

Description

technical field [0001] The invention relates to a lithium-ion battery separator, in particular to a ceramic separator with airgel as powder and its application in lithium-ion batteries. 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 materials with microporous structur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M10/0525
CPCH01M10/0525H01M50/411H01M50/431H01M50/449Y02E60/10
Inventor 赵金保张鹏
Owner XIAMEN UNIV
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