Coating slurry, preparation method thereof, and composite porous diaphragm and lithium ion battery prepared by applying coating slurry

A porous and slurry technology, applied in the field of lithium ion batteries and composite porous diaphragms, can solve the problem of flame retardant and explosion-proof safety performance affecting the capacity, charge and discharge cycle life of lithium batteries, lack of mechanical strength of organic coatings, and reduced lithium ion conductivity. and other problems, to achieve the effect of improving high temperature thermal stability, good thermal shrinkage resistance, and ensuring mechanical strength

Pending Publication Date: 2022-04-15
惠州市旭然新能源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the organic coating lacks mechanical strength, and there is a risk that the separator will be punctured if lithium crystallization occurs. Moreover, the thermal stability is not high, and the thermal shrinkage rate of the separator is relatively large, which affects the capacity of the lithium battery and the cycle time of charge and discharge. Life and safety performance of flame retardant and explosion-proof
[0005] In response to the above situation, there are related technologies that add inorganic materials to the organic functional coating to enhance its mechanical strength and inhibit the thermal shrinkage of the diaphragm. However, due to the incompatibility between the inorganic material and the organic functional coating, the thickness of the coating If it is too thick, the conductivity of lithium ions is reduced, and the inorganic material is easy to fall off after coating and drying.

Method used

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  • Coating slurry, preparation method thereof, and composite porous diaphragm and lithium ion battery prepared by applying coating slurry
  • Coating slurry, preparation method thereof, and composite porous diaphragm and lithium ion battery prepared by applying coating slurry
  • Coating slurry, preparation method thereof, and composite porous diaphragm and lithium ion battery prepared by applying coating slurry

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Preparation of coating slurry:

[0050] Preparation of preparatory materials: In this application, Al2O3 is represented, other inorganic ceramic materials, such as SiO 2 , γ-AlOOH, BaSO 4 , CaO, TiO 2 , ZnO 2 , MgO, ZrO 2 , SnO 2 The same applies to this application. Weigh 100g of aluminum oxide particles with a particle size D50 of 0.4um and 50g of polyvinylidene fluoride powder polymerized from hexafluoropropylene and vinylidene fluoride, with a degree of polymerization of 4% and a melting temperature of 130°C, and mix until uniform , then add 100g of deionized water, put it into a blender and stir at a low speed, the stirring rate is 100r / min, stir and knead until viscous to get the preparation;

[0051] Thickening solution preparation: Weigh 60g of sodium carboxymethyl cellulose, add 700g of deionized water, stir for 15 minutes to fully dissolve it, and obtain a thickening solution;

[0052] The first step is to mix the preparatory material with the thickenin...

Embodiment 2

[0059] Preparation of coating slurry

[0060] Preparatory material preparation: Weigh 160g of aluminum oxide particles with a particle size D50 of 0.4um and polyvinylidene fluoride powder polymerized from hexafluoropropylene and vinylidene fluoride with a polymerization degree of 4% and a melting temperature of 150°C 90g, mix until uniform, then add 200g of deionized water, put it into a mixer for low-speed stirring, the stirring rate is 80r / min, stir and knead until viscous to get the preparation;

[0061] Thickening solution preparation: Weigh 95g of sodium carboxymethyl cellulose, add 600g of deionized water, stir for 20min to fully dissolve it, and obtain a thickening solution;

[0062] The first step is to mix the preparatory material with the thickening solution, stir, and control the rotation speed at 1000r / min, and stir for 1.5h to obtain the premixed material;

[0063] In the second step, add 33g of polyacrylate to the premixed material obtained in the first step, co...

Embodiment 3

[0068] Preparation of coating slurry:

[0069] Preparatory material preparation: Weigh 200g of aluminum oxide particles with a particle size D50 of 0.4um and polyvinylidene fluoride powder polymerized from hexafluoropropylene and vinylidene fluoride with a degree of polymerization of 4% and a melting temperature of 150°C 120g, mix until uniform, then add 300g of deionized water, put it into a mixer for low-speed stirring, the stirring rate is 50r / min, stir and knead until viscous to get the preparation;

[0070] Thickening solution preparation: weigh 120g of sodium carboxymethyl cellulose, add 300g of deionized water, stir for 30min to fully dissolve it, and obtain a thickening solution;

[0071] The first step is to mix the preparatory material with the thickening solution, stir, and control the rotation speed at 1000r / min, and stir for 2 hours to obtain the premixed material;

[0072] In the second step, add 60g of polyacrylate to the premixed material obtained in the first...

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Abstract

The invention relates to the field of lithium batteries, in particular to coating slurry, a preparation method thereof, a composite porous diaphragm prepared by applying the coating slurry and a lithium ion battery. A composite porous diaphragm comprises a porous base material, at least one surface of the porous base material is coated with an inorganic / organic composite functional coating, the inorganic / organic composite functional coating is subjected to corona and plasma / ultraviolet radiation treatment, and the inorganic / organic composite functional coating is mainly prepared from coating slurry and 60-80 parts of deionized water; 10 to 20 parts of aluminum oxide; 5 to 12 parts of polyvinylidene fluoride; 6 to 12 parts of a thickening agent; 2-6 parts of a binder; and 2-4 parts of a carbonic ester compound. The composite porous diaphragm can be used for a lithium battery, and has the advantages of improving the stability and safety of long-term circulation of the battery and the like.

Description

technical field [0001] The application relates to the field of lithium batteries, more specifically, it relates to a coating slurry, a preparation method thereof, and a composite porous diaphragm made of the coating slurry, and a lithium ion battery. Background technique [0002] With the rapid advancement of information, materials and energy technologies, lithium batteries have become a hotspot in the research of new power supply technologies due to their advantages such as high specific energy, long cycle life, no memory effect, safety and reliability, and fast charging and discharging. In the structure of lithium batteries, the separator is one of the key inner components. The diaphragm is used to isolate the positive and negative poles of the battery to prevent short circuits, and it can also block the current signal in the battery by closing the pores when the battery is overheated. The performance of the separator determines the interface structure and internal resist...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M50/446H01M50/449H01M50/489H01M50/491H01M10/0525
Inventor 余康方超
Owner 惠州市旭然新能源有限公司
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