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Viscous battery separator and lithium ion battery employing same

A battery separator and viscous technology, applied in the direction of separators/films/diaphragms/spacers, secondary batteries, battery pack components, etc., can solve the problems of poor safety performance, low battery flatness and hardness, and improve the The effect of flatness and hardness

Active Publication Date: 2017-11-03
东莞市赛普克电子科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a high-viscosity battery separator in view of the deficiencies of the prior art, so as to overcome the low flatness and hardness of the battery and the low safety performance of the existing separator due to its poor adhesion to the negative electrode. bad question

Method used

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  • Viscous battery separator and lithium ion battery employing same
  • Viscous battery separator and lithium ion battery employing same
  • Viscous battery separator and lithium ion battery employing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Preparation of positive electrode sheet:

[0039] Lithium cobaltate, conductive agent superconducting carbon (Super-P), and binder polyvinylidene fluoride (PVDF) are uniformly mixed at a mass ratio of 97:1.5:1.5 to form a positive slurry for lithium-ion batteries with a certain viscosity. The slurry is coated on the current collector aluminum foil, dried at 85°C and then cold pressed; then trimmed, cut, and slit. After slitting, it is dried at 110°C under vacuum for 4 hours, and the tabs are welded. The positive plate of lithium ion battery is made.

[0040] Preparation of negative electrode sheet:

[0041] The graphite and the conductive agent Super-P (Super-P), the thickener sodium carboxymethyl cellulose (CMC), and the binder styrene butadiene rubber (SBR) are made into a slurry at a mass ratio of 96:2.0:1.0:1.0 , Coated on the current collector copper foil and dried at 85 ℃, trimming, cutting, slitting, after slitting, drying at 110 ℃ under vacuum conditions for 4 hours,...

Embodiment 2

[0049] The difference from Example 1 is the preparation of the diaphragm:

[0050] 1) Take a polypropylene microporous membrane with a thickness of 16μm as the base membrane;

[0051] 2) Mix ethylene-tetrafluoroethylene copolymer, sodium carboxymethyl cellulose and polyacrylate in deionized water at a mass ratio of 92:1.0:7.0 to form an aqueous fluoropolymer coating slurry with a solid content of 15% The fluorine-containing polymer coating slurry is coated on one surface of the base film by screen printing. After drying, a fluorine-containing polymer coating uniformly distributed in an island shape is obtained. The coating thickness is 2μm, the coating area is 90% of the base film area;

[0052] 3) Mix acrylic-styrene copolymer, sodium carboxymethyl cellulose and polyacrylate in deionized water at a mass ratio of 92:1.0:7.0 to form an aqueous acrylic polymer coating slurry with a solid content of 15%. And by screen printing, the acrylic polymer coating slurry is coated on the other...

Embodiment 3

[0055] The difference from Example 1 is the preparation of the diaphragm:

[0056] 1) Take a polyimide film with a thickness of 16 μm as the base film;

[0057] 2) Mix the polyvinylidene fluoride-hexafluoropropylene copolymer, sodium carboxymethyl cellulose and polyacrylate in deionized water at a mass ratio of 89:1.5:9.5 to form an aqueous fluoropolymer with a solid content of 10% Coating slurry, the fluoropolymer coating slurry is coated on one surface of the base film by extrusion coating, and then dried to obtain a uniformly distributed fluoropolymer coating in island shape. The coating thickness is 1μm, and the coating area is 75% of the base film area;

[0058] 3) Mix acrylic acid-silicone copolymer, sodium carboxymethyl cellulose and polyacrylate in deionized water at a mass ratio of 89:1.5:9.5 to form an aqueous acrylic polymer coating slurry with a solid content of 10%. And by extrusion coating, the acrylic polymer coating slurry is coated on the other surface of the base ...

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Abstract

The invention belongs to the technical field of a lithium ion battery, and particularly relates to a viscous battery separator and a lithium ion battery employing the same. The separator comprises a base membrane, a fluorine-containing polymer coating layer and an acrylic polymer coating layer, wherein the fluorine-containing polymer coating layer is coated on a surface, right opposite to a positive pole plate, of the base membrane, and the acrylic polymer coating layer is coated on a surface, right opposite to a negative pole plate, of the base membrane. Compared with the prior art, the fluorine-containing polymer coating layer having a favorable binding effect is coated on the surface, right opposite to the positive pole plate, of the base membrane, the acrylic polymer coating layer having a favorable binding effect with a negative electrode is coated on the surface, right opposite to the negative pole plate, of the base membrane, so that the separator have relatively high adhesion on a positive electrode and the negative electrode, the smoothness and the hardness of the battery are effectively improved, and the safety under the condition that the battery is punctured, colluded and extruded is further improved.

Description

Technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a viscous battery diaphragm and a lithium ion battery using the diaphragm. Background technique [0002] Lithium-ion batteries are widely used in consumer electronics products and products that need to provide power and energy storage due to the advantages of large specific energy, high working voltage, long cycle life, and environmental friendliness. With the large-scale application of lithium-ion batteries, battery safety issues have become increasingly prominent. [0003] The main components of a lithium-ion battery include positive electrode sheet, negative electrode sheet, separator and electrolyte. Among them, the separator is located between the positive electrode sheet and the negative electrode sheet of the lithium ion battery, and is a key component of the lithium ion battery. The main function of the battery separator is to separate the positive ele...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M2/18H01M10/0525H01M50/403H01M50/414H01M50/417H01M50/426H01M50/457
CPCH01M10/0525H01M50/409H01M50/461H01M50/463Y02E60/10
Inventor 赖旭伦麦伟杰黄伟荣
Owner 东莞市赛普克电子科技有限公司
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