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Ceramic slurry, ceramic composite diaphragm and lithium ion battery

A ceramic slurry and slurry technology, applied in secondary batteries, battery pack parts, circuits, etc., can solve the problem of uneven dispersion of ceramic particles, and achieve the effects of good adhesion, high peel strength, and improved absorption capacity

Inactive Publication Date: 2019-03-08
DONGGUAN DONGYANG SOLAR SCI RES & DEV CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problem of uneven dispersion of the above-mentioned ceramic particles in the diaphragm coating slurry, the present invention provides a ceramic slurry containing a dispersant, the dispersant is an amphiphilic polymer compound with a comb structure, and is dispersed by The interaction between the agent and the ceramic particles can achieve the effect of uniform dispersion of the ceramic particles without pre-dispersion and ball milling

Method used

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  • Ceramic slurry, ceramic composite diaphragm and lithium ion battery
  • Ceramic slurry, ceramic composite diaphragm and lithium ion battery
  • Ceramic slurry, ceramic composite diaphragm and lithium ion battery

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preparation example Construction

[0041] The present invention also provides a preparation method of the ceramic slurry, comprising the steps of:

[0042]Add thickener, dispersant and wetting agent into deionized water and stir to obtain a solution;

[0043] adding ceramic particles to the above solution, stirring and dispersing to obtain a ceramic dispersion;

[0044] The binder is added to the ceramic dispersion, stirred and dispersed, then defoamed and filtered to obtain a ceramic slurry.

[0045] According to some embodiments of the present invention, the preparation method of the ceramic slurry includes the following steps: firstly add the thickener, the dispersant and the wetting agent into the deionized water, and stir in the zigzag disperser at 300-600r / Min speed of stirring for 0.5h to obtain the solution; Al 2 o 3 Add the particles into the solution, first stir at 3000-4000r / min for 3 hours to obtain a ceramic dispersion; adjust the speed to 1500-2000r / min, add binder, stir for 1h, and finally re...

Embodiment 1

[0055] Add 100g of deionized water into the stainless steel mixing tank, turn on the speed of the zigzag stirring and dispersing machine to 500r / min, weigh 0.4g of thickener CMC, 0.1g of dispersant Tersperse2500 and 0.1g of wetting agent 1831 and add them to the mixing tank Stir and dissolve in medium for 0.5h; then add 25g Al 2 o 3 Particles (particle size 0.5μm), and adjust the mixer to 3000r / min high-speed stirring and dispersing for 3h, then adjust the speed to 2000r / min, add 1g of binder SBR and stir for 1h to stir evenly, and finally reduce the speed to 100r / min Stir at a low speed for 1 hour to eliminate air bubbles in the slurry, and then filter with a filter cloth to obtain the prepared water-based ceramic slurry (particle size: 0.6 μm) and store it for later use.

[0056] Using a micro-concave automatic coating machine, the above-mentioned water-based ceramic slurry is evenly coated on the surface of the PE diaphragm. The running speed of the PE diaphragm is 10.0m / m...

Embodiment 2

[0058] Add 100g of deionized water into the stainless steel mixing tank, turn the speed of the zigzag stirring disperser to 500r / min, weigh 0.5g of thickener CMC, 0.2g of dispersant Tersperse2500 and 0.2g of wetting agent 1831 and add them to the mixing tank Stir and dissolve in medium for 0.5h; then add 35g Al 2 o 3 Particles (particle size 0.5μm), and adjust the mixer to 3000r / min high-speed stirring and dispersing for 3h, then adjust the speed to 2000r / min, add 2g of binder SBR and stir for 1h to stir evenly, and finally reduce the speed to 100r / min Stir at a low speed for 1 hour to eliminate air bubbles in the slurry, and then filter with a filter cloth to obtain the prepared water-based ceramic slurry (particle size: 0.8 μm) and store it for later use.

[0059] Using a micro-concave automatic coating machine, the above-mentioned water-based ceramic slurry is evenly coated on the surface of the PE diaphragm, the base film is running at a speed of 8.0m / min, and the hot air...

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Abstract

The invention relates to the technical field of lithium ion battery diaphragm preparation, and discloses ceramic slurry, a ceramic composite diaphragm and a lithium ion battery. The slurry comprises deionized water, ceramic particles, a thickening agent, a binder, a dispersing agent and a wetting agent, wherein the dispersing agent is an amphiphilic high-molecular compound with a comb structure. The ceramic composite diaphragm prepared from the slurry is high in thermal stability, puncture resistance and liquid absorption capacity, and the ceramic coating is not easy to fall off in an electrolyte when being used in the lithium ion battery, so that the cycling life of the battery can be prolonged, and the consistency of cells and the safety of the battery can be improved.

Description

technical field [0001] The invention relates to the technical field of preparation of lithium-ion battery diaphragms, and more specifically, to an aqueous ceramic slurry, a composite diaphragm prepared from the slurry, and a lithium-ion battery comprising the composite diaphragm. Background technique [0002] Lithium-ion batteries have the advantages of high specific energy, long cycle life, no memory effect, safety, reliability, and fast charging and discharging, and have become a research hotspot in new power supply technologies in recent years. The composition of a lithium-ion battery includes a positive electrode, a negative electrode, a separator and an electrolyte. As a barrier between the positive and negative electrodes, the separator plays a vital role in the performance of the lithium-ion battery, and its performance directly affects the capacity and cycle of the battery, especially It is an important factor affecting the safety performance of the battery, and coat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M2/14H01M10/0525H01M50/403H01M50/434H01M50/446H01M50/457H01M50/489
CPCH01M10/0525H01M50/403H01M50/411H01M50/44H01M50/449Y02E60/10
Inventor 李义涛黄连红程宗盛邹智杰张凌飞云晧
Owner DONGGUAN DONGYANG SOLAR SCI RES & DEV CO LTD
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