Lithium battery separator coated with mixed coating layer and preparation method of lithium battery separator

A coating and diaphragm technology, applied in the field of lithium battery diaphragms coated with organic-inorganic hybrid coatings, can solve the problems of insufficient thermal stability, improve thermal stability and strength, enhance gas permeability, and gas permeability Good results

Inactive Publication Date: 2018-11-20
HEBEI GELLEC NEW ENERGY MATERIAL SCI&TECHNOLOY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] As the energy density of lithium-ion batteries increases year by year, the amount of inactive materials is also getting smaller and smaller, and the diaphragm is getting thinner and thinner, which will bring great challenges to the safety of lithium-ion batteries. The thinner it is, the glue or ceramic coating on the diaphragm is not enough to meet the needs of thermal stability

Method used

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  • Lithium battery separator coated with mixed coating layer and preparation method of lithium battery separator
  • Lithium battery separator coated with mixed coating layer and preparation method of lithium battery separator
  • Lithium battery separator coated with mixed coating layer and preparation method of lithium battery separator

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A lithium battery diaphragm coated with a mixed coating, the mixed coating dispersion slurry used comprises the raw materials of the following weight components: polyvinyl alcohol 5%, alumina micropowder 18%, N-methylpyrrolidone 48%, propylene glycol 18% , CaCl 2 Micropowder 2%, propylene carbonate 5%, polyvinylpyrrolidone 4%.

[0031] Its preparation steps are as follows:

[0032] (1) Mix polyvinyl alcohol and N-methylpyrrolidone in proportion, stir at room temperature at 1500rpm for 120min, then add propylene carbonate and continue stirring at 1500rpm for 120min, finally add polyvinylpyrrolidone and continue stirring at the same speed for 120min After making mixed solution one;

[0033] (2) Mix the alumina micropowder with propylene glycol in proportion, and stir at a speed of 2500rpm for 150min at room temperature to prepare mixed solution 2;

[0034] (3) Add the prepared mixed solution 1 into the mixed solution 2, and stir for 150 min at a rotating speed of 1500 ...

Embodiment 2

[0039] According to the preparation process of embodiment 1, change the raw material and proportioning of mixed coating dispersion slurry, used raw material and weight component are as follows:

[0040] 6% polym-phenylene isophthalamide, 18% aluminum oxide powder, 47% N-methylpyrrolidone, 18% propylene glycol, CaCl 2 Micropowder 2%, ethylene carbonate 6%, polyvinylpyrrolidone 3%.

[0041] The preparation method of the lithium battery diaphragm coated with the hybrid coating is as follows:

[0042] (1) Mix polym-phenylene isophthalamide and N-methylpyrrolidone in proportion, stir at room temperature at 1200rpm for 150min, then add ethylene carbonate and continue stirring at 1200rpm for 120min, and finally add polyvinylpyrrolidone After continuing to stir at the same speed for 120min, mixed solution 1 was obtained;

[0043] (2) Mix the alumina micropowder with propylene glycol in proportion, stir at room temperature at a speed of 2000rpm for 180min, and prepare mixed solution ...

Embodiment 3

[0049] According to the preparation process of embodiment 1, change the raw material and proportioning of mixed coating dispersion slurry, used raw material and weight component are as follows:

[0050] 9% poly-p-phenylene terephthalamide, 15% aluminum hydroxide micropowder, 45% dimethylacetamide, 23% dipropylene glycol, 2% LiCl micropowder, 2% dimethyl carbonate, 4% polyvinylpyrrolidone .

[0051] The preparation method of the lithium battery diaphragm coated with the hybrid coating is as follows:

[0052] (1) Mix poly-p-phenylene terephthalamide and dimethylacetamide in proportion, stir at room temperature at 1200rpm for 150min, then add dimethyl carbonate and continue stirring at 1200rpm for 120min, and finally add polyethylene Pyrrolidone continued to stir at the same speed for 120min to obtain mixed solution 1;

[0053] (2) Mix LiCl micropowder with dipropylene glycol in proportion, stir at room temperature at a speed of 2000rpm for 180min, and prepare mixed solution 2;...

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Abstract

The invention discloses a lithium battery separator coated with a mixed coating layer and a preparation method of the lithium battery separator. The lithium battery separator comprises a basic film and the coating layer, wherein the coating layer is formed by coating a mixed coating layer dispersion paste at one side or two sides of the basic film. The preparation method comprises the steps of mixing an organic main material and an inorganic main material to obtain the mixed coating layer dispersion paste under effects of a co-solvent, a binding agent and a pore forming agent; coating the paste onto the lithium battery basic film to obtain a separator with the coating layer being 1-2 micrometers; and finally, quenching the coating separator by a quenching agent, and obtaining the lithium battery separator coated with the mixed coating layer after drying. The lithium battery separator has high strength, good thermal stability and excellent gas permeability, and meanwhile, the lithium battery separator is simple in fabrication process, low in cost and can be produced on a large scale.

Description

technical field [0001] The invention relates to the technical field of lithium battery separators, in particular to a lithium battery separator coated with a hybrid coating, in particular to a lithium battery separator coated with an organic-inorganic hybrid coating and a preparation process thereof. Background technique [0002] Coated diaphragm is a new type of diaphragm product developed in recent years. During the charging and discharging process of the battery, the coating can maintain the integrity of the diaphragm, can effectively prevent the short circuit of the positive and negative large areas, and can also effectively improve the surface of the diaphragm. tension, reduce the interface impedance between the diaphragm and the pole piece, and improve the liquid absorption performance of the diaphragm. [0003] As the energy density of lithium-ion batteries increases year by year, the amount of inactive materials is also getting smaller and smaller, and the diaphragm ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M2/14
CPCH01M50/403H01M50/446Y02E60/10
Inventor 徐锋王晓静袁海朝苏碧海
Owner HEBEI GELLEC NEW ENERGY MATERIAL SCI&TECHNOLOY CO LTD
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