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Preparation method for ceramic coating separator

A ceramic coating and separator technology, applied in electrical components, circuits, battery pack components, etc., can solve the problems of uneven ceramic coating, low bonding strength, etc., and achieve improved thermal shrinkage performance, improved wettability, The effect of improving battery life

Active Publication Date: 2014-12-03
ZHANGJIAGANG NENGCI MATERIAL SCI & TECHCO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Ozone treatment is applied to the diaphragm substrate before coating, so that the wettability of the diaphragm and the water-based adhesive is significantly improved, and the uneven ceramic coating and low bonding strength caused by the poor wettability of the diaphragm substrate and the water-based adhesive system are overcome. Defects

Method used

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  • Preparation method for ceramic coating separator
  • Preparation method for ceramic coating separator
  • Preparation method for ceramic coating separator

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) Preparation of ceramic slurry

[0031] ① Add deionized water, silicon dioxide with a particle size of 0.2μm, ceramic powder and deionized The weight ratio of water is 30:70, 3000r / min high-speed stirring and ultrasonic oscillation for 0.5 hours;

[0032] ② Add sodium polyacrylate with a slurry volume of 5%, and stir at a high speed of 3000r / min while ultrasonically oscillating for 0.5 hours;

[0033] ③ Add 0.5% glycerin to the slurry, stir at a high speed of 3000r / min while ultrasonically oscillating for 2 hours;

[0034] ④ Add carboxylated styrene-butadiene rubber (SBR) with a slurry amount of 10% (prepared into a 50% emulsion), and add carboxymethyl cellulose sodium (CMC) with a slurry amount of 5% (prepared into a 2% solution) ; 3000r / min high-speed stirring while ultrasonic oscillation for 2 hours;

[0035] ⑤ Reduce the rotation speed to 500 r / min, turn off the ultrasonic vibration, turn on the vacuum, stir for 0.5 hours, then turn off the vacuum to bala...

Embodiment 2

[0042] (1) Preparation of ceramic slurry

[0043] ① Add deionized water, silicon oxide with a particle size of 0.8 μm, and zirconia with a particle size of 1.0 in a vacuum, high-speed, and planetary stirring device with ultrasonic oscillation function (rotation speed 0-3000r / min adjustable, ultrasonic frequency 20kHz oscillation) , Zinc oxide with a particle size of 0.4 (weight ratio is 7:2.5:0.5), the weight ratio of ceramic powder (silicon oxide, zirconia, zinc oxide mixture) to deionized water is 10:90, 2000r / min high-speed stirring while ultrasonic Shake for 1 hour;

[0044] ② Add sodium orthophosphate, sodium silicate, and sodium lauryl sulfate (weight ratio 1:1:1) with a slurry volume of 0.5%, and stir at 2000r / min at a high speed while ultrasonically oscillating for 1 hour;

[0045] ③ Add N-methylpyrrolidone, alcohol, and propylene carbonate (weight ratio 1:1:1) with a slurry volume of 10%, stir at a high speed of 2000r / min while ultrasonically oscillating for 1 h...

Embodiment 3

[0054] (1) Preparation of ceramic slurry

[0055] ① Add deionized water, aluminum oxide with a particle size of 0.4μm and aluminum oxide with a particle size of 0.05 to a vacuum, high-speed, and planetary stirring device with ultrasonic oscillation function (rotation speed 0-3000r / min adjustable, ultrasonic frequency 20kHz oscillation). The weight ratio of magnesium oxide (9:1 by weight), ceramic powder (a mixture of aluminum oxide and magnesium oxide) to deionized water is 5:95, 1500r / min high-speed stirring and ultrasonic oscillation for 2 hours;

[0056] ② Add sodium polymetaphosphate and ammonia water (weight ratio 3:1) with a slurry volume of 3%, stir at a high speed of 1500r / min while ultrasonically oscillating for 2 hours;

[0057] ③ Add dimethyl sulfoxide, polyoxyethylene alkylphenol ether, polyoxyethylene fatty alcohol ether, polyvinyl alcohol (weight ratio 1:1:1:0.5) with a slurry volume of 5%, and stir at a high speed of 1500r / min at the same time Ultrasonic o...

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Abstract

The invention relates to a preparation method for a ceramic coating separator material used to lithium ion batteries. The preparation method comprises steps of preparation of a ceramic slurry, separator pretreatment, precise coating, drying and the like. The prepared product has the characteristics that the ceramic coating is compact, uniformly and firm in adhesion and the separator is small in thermal shrinkage, and the prepared product has obvious effect on improving safety performance of the lithium ion battery and prolonging battery service life.

Description

technical field [0001] The invention relates to a ceramic coating diaphragm for a lithium ion battery, belonging to the field of new energy materials. Background technique [0002] Lithium-ion batteries have been widely used in portable electronic devices such as notebook computers, digital cameras, and mobile phones since the 1990s. At the same time, it is also widely used in electric vehicles and large energy storage systems. [0003] Lithium-ion battery is currently the best performance among industrialized energy storage secondary batteries. It has excellent characteristics such as high energy density, long life, and high power density. It is currently the preferred energy storage battery for electric vehicles. However, the safety issues of lithium-ion power batteries (generally larger capacity and higher power lithium-ion batteries used in electric vehicles and other fields are called lithium-ion power batteries) (there are hidden dangers such as fire and explosion) ar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16C04B35/10C04B35/48C04B35/14C04B35/01C04B35/46C04B35/622
CPCC04B35/01C04B35/10C04B35/14C04B35/46C04B35/48C04B35/622H01M50/446Y02E60/10
Inventor 李荐杨亮周宏明
Owner ZHANGJIAGANG NENGCI MATERIAL SCI & TECHCO LTD
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