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Modified TiO2 and PMMA (polymethyl methacrylate) composite coating diaphragm and preparation method thereof

A coating and modification technology, which is applied to structural parts, electrical components, battery pack parts, etc., can solve the problems of unstable performance of coated diaphragm materials, poor liquid absorption and retention capacity, and high thermal shrinkage rate, and achieve improved Wettability and liquid absorption and retention capacity, reducing heat shrinkage, and improving coating efficiency

Active Publication Date: 2022-06-28
JIANGSU HORIZON NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved in the present invention is to provide a stable performance, thermal shrinkage rate and other problems in the current lithium-ion battery coating diaphragm material, such as unstable performance, high thermal shrinkage rate, poor wettability, poor liquid absorption and liquid retention ability, etc. Low, good wettability and liquid absorption and liquid retention capacity of TiO 2 @PMMA Composite Coated Diaphragm

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Modified TiO 2 Preparation of powder

[0029] Weigh 5g triethanolamine and 5g TiO 2 Mix, add 200mL of toluene solution, ultrasonically disperse for 1h, add 0.1g of KH-560, ultrasonically disperse for 5min, transfer the mixture to a flask, heat in a 60°C water bath, condensate and reflux for 2-4h, TiO 2 The powder is filtered, washed and dried to obtain the modified TiO 2 powder;

[0030] (2)TiO 2 Preparation of @PMMA Composite Particles

[0031] Weigh the modified TiO obtained in step (1) 2 Mix 5 g of powder with 500 mL of water, ultrasonically disperse for 1 h, add 0.5 g of potassium persulfate and 15 mL of methyl methacrylate under a nitrogen atmosphere, heat in a water bath at 70 °C, and magnetically stir for 6 h. The obtained powder is filtered and washed with suction to obtain TiO 2 @PMMA composite particles;

[0032] (3) Preparation of slurry

[0033] Weigh the TiO prepared in step (2) 2 Add 5g of @PMMA composite particles and 0.05g of dispersant to ...

Embodiment 2

[0039] (1) Modified TiO 2 Preparation of powder

[0040] Weigh 6g triethanolamine and 5g TiO 2 Mix, add 200mL of toluene solution, mix and ultrasonically disperse for 1h, add 0.1g of KH-570, ultrasonically disperse for 5min, transfer the mixture to a flask, heat in a 50°C water bath, condensate and reflux for 2-4h, TiO 2 The powder is filtered, washed and dried to obtain the modified TiO 2 powder;

[0041] (2)TiO 2 Preparation of @PMMA Composite Particles

[0042] Weigh the modified TiO obtained in step (1) 2 Mix 5 g of powder with 500 mL of water, ultrasonically disperse for 1 h, add 0.5 g of potassium persulfate and 15 mL of methyl methacrylate under an argon atmosphere, heat in a water bath at 80 °C, and magnetically stir for 6 h. The obtained powder is filtered and washed with suction, namely get TiO 2 @PMMA composite particles;

[0043] (3) Preparation of slurry

[0044] Weigh the TiO prepared in step (2) 2 Add 5g of @PMMA composite particles and 0.05g of dispersa...

Embodiment 3

[0050] (1) Modified TiO 2 Preparation of powder

[0051] Weigh 7.5g triethanolamine and 5g TiO 2 Mix, add 200 mL of toluene solution, mix and ultrasonically disperse for 1 h, add 0.1 g of KH-560, ultrasonically disperse for 5 min, transfer the mixture to a flask, heat in a water bath at 70 °C, condensate and reflux for 2 to 4 h, for TiO 2 The powder is filtered, washed and dried to obtain the modified TiO 2 powder;

[0052] (2)TiO 2 Preparation of @PMMA Composite Particles

[0053] Weigh the modified TiO obtained in step (1) 2 Mix 5 g of powder with 500 mL of water, ultrasonically disperse for 1 h, add 0.5 g of potassium persulfate and 15 mL of methyl methacrylate under nitrogen atmosphere, heat in a water bath at 70°C, stir magnetically for 8 h, and filter and wash the obtained powder to obtain TiO 2 @PMMA composite particles;

[0054] (3) Preparation of slurry

[0055] Weigh the TiO prepared in step (2) 2 Add 5g of @PMMA composite particles and 0.05g of dispersant ...

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Abstract

The invention discloses a modified TiO2 coated PMMA (polymethyl methacrylate) composite coating diaphragm and a preparation method thereof, the composite coating diaphragm is composed of a polyolefin diaphragm and a modified TiO2 coated PMMA coating, and the thickness of the composite coating film is 10-20 microns. The preparation method of the coated diaphragm comprises the following steps: modifying TiO2 powder through a silane coupling agent; preparing TiO2 coated PMMA (polymethyl methacrylate) composite particles; then successively adding a binder, a thickener, a wetting agent and other assistants to obtain a slurry; then preparing a TiO2 and PMMA (polymethyl methacrylate) mixed coating diaphragm; and finally, modifying by using polydopamine. The TiO2 and PMMA composite coating diaphragm obtained through the methods of hydroxyl on the surface of TiO2, modification of the silane coupling agent, grafting of PMMA to the surface of TiO2, modification of polydopamine and the like is stable in performance, low in thermal shrinkage rate and good in wetting performance and liquid absorption and retention capacity.

Description

technical field [0001] The invention relates to the field of preparation of lithium ion battery separators, in particular to a modified TiO 2 @PMMA composite coated separator and its preparation method. Background technique [0002] Lithium-ion batteries have the characteristics of high specific energy, high cycle life, small size, light weight, no memory effect, and no pollution. They are the substitutes of mainstream nickel-cadmium and nickel-hydrogen batteries, and have a great development direction in energy storage equipment. It has the potential to rapidly develop into a new generation of energy storage power sources, which can be used for power support in the fields of information technology, electric and hybrid vehicles, and aerospace. As one of the key inner layer components of lithium-ion batteries, the separator plays a crucial role in the performance of lithium-ion batteries. The capacity, cycle performance, and safety performance of the battery are closely rela...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M50/451H01M50/446H01M50/403H01M50/491H01M50/497H01M10/0525
CPCH01M50/451H01M50/446H01M50/403H01M50/491H01M50/497H01M10/0525Y02E60/10
Inventor 李梦佳张立斌赵海玉陈朝晖
Owner JIANGSU HORIZON NEW ENERGY TECH CO LTD
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