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A preparation method of a ceramic coated separator for lithium ion batteries

A lithium-ion battery and ceramic coating technology, which is applied to secondary batteries, battery components, circuits, etc., can solve the problems of low capacity retention, failure to meet the use requirements, and low peel strength, and achieve high peel strength and easy Coating on polyolefin microporous membrane, the effect of easy thickness uniformity

Pending Publication Date: 2018-12-28
HENAN FUSEN NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The diaphragm of this invention is made into a lithium-ion battery, then charged at a rate of 1C at room temperature, discharged at a rate of 1C, and then cycled 500 times in sequence, the capacity retention rate is low, and the peeling strength is small, which cannot meet the requirements of use

Method used

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  • A preparation method of a ceramic coated separator for lithium ion batteries
  • A preparation method of a ceramic coated separator for lithium ion batteries
  • A preparation method of a ceramic coated separator for lithium ion batteries

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] (1) Preparation of polymer glue: Put 15% polyvinylidene fluoride, 80% N-methylpyrrolidone, and 5% sodium methylcellulose in the dispersion tank in sequence, and heat through 1000r / min A high-speed disperser was used to uniformly disperse for 2 hours to obtain a polymer glue.

[0051] (2) Preparation of ceramic coating slurry: 10% styrene-butadiene rubber, 2% polyethylene glycol, 30% acetone, 10% sodium isethionate, 6% silicic acid Salt solution, 2% polysiloxane, 24% large-particle alumina powder with a particle size of 1100nm, and 16% small-particle alumina powder with a particle size of 400nm were placed in the dispersion tank in sequence, and dispersed at a high speed of 8000r / min After dispersing in a high-speed machine for 6 hours, filter through a 400-mesh screen to obtain a ceramic coating slurry.

[0052] (3) Preparation of PVDF and its copolymer glue: put 12% vinylidene fluoride-trifluoroethylene powder, 81% deionized water, and 7% sodium polyacrylate in the di...

Embodiment 2

[0055] (1) Preparation of polymer glue: 11% polymethyl methacrylate, 82% N-methylpyrrolidone, and 7% polyethylene glycol were placed in the dispersion tank in sequence, and were heated through 800r / min high-speed disperser to obtain polymer glue after uniform dispersion for 1.5h.

[0056] (2) Preparation of ceramic coating slurry: 13% sodium carboxymethyl cellulose, 10% sodium polyacrylate, 25% acetone, 8% fluoroalkyl ethoxy alcohol ether, 4% of the silicate solution, 3% of the acrylate copolymer, 27% of the large-particle alumina powder with a particle size of 800nm, and 10% of the small-particle alumina powder with a particle size of 300nm were placed in the dispersion tank in sequence. 7500r / min high-speed disperser disperses at high speed for 5 hours, and then filters through a 600-mesh sieve to obtain a ceramic coating slurry.

[0057] (3) Preparation of PVDF and its copolymer glue: put vinylidene fluoride-tetrafluoroethylene powder with a mass ratio of 25%, 69% deioniz...

Embodiment 3

[0060] (1) Preparation of polymer glue: put 28% styrene-butadiene rubber, 62% dimethylacetamide, and 10% polyethylene glycol in the dispersion tank in sequence, and pass through a high-speed 2000r / min The polymer glue was obtained after uniform dispersion by the disperser for 2.5 hours.

[0061] (2) Preparation of ceramic coating slurry: 15% polymethyl methacrylate, 8% sodium polyacrylate, 28% N-methylpyrrolidone, 7% dodecylsulfonic acid Sodium, 7% sodium hydroxymethyl cellulose solution, 5% titanate, 24% large-particle alumina powder with a particle size of 650nm, and 6% small-particle alumina powder with a particle size of 100nm were placed in the dispersion tank in sequence In the process, the ceramic coating slurry was obtained after being dispersed by a 5000r / min high-speed disperser for 7 hours at a high speed, and then filtered through a 800-mesh screen.

[0062] (3) Preparation of PVDF and its copolymer glue: put 31% vinylidene fluoride-hexafluoroethylene powder, 60% ...

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Abstract

The invention discloses a preparation method of a ceramic coating separator for lithium ion batteries and belongs to the technical field of lithium ion battery separator production. The method involves a polymer porous base film, a polymer glue applied on one or both sides of the base film surface, a ceramic coating applied on the surface of the polymer glue, and a PVDF and its copolymer glue applied on the other side of the ceramic coating surface and the base film surface, wherein the PVDF and its copolymer glue are coated on the other side of the ceramic coating surface and the base film surface. The inorganic ceramic particles adopted by the invention are non-spherical and multi-particle, which can greatly improve the porosity of the ceramic coating, increase the lithium ion transit property, improve the liquid absorption rate of the diaphragm, and improve the rate performance and cycle life of the lithium ion battery. As the structure design of the ceramic coat diaphragm of the invention can increase the adhesive force of the ceramic coating and the polymer porous base membrane, the adhesive strength of the diaphragm and the positive and negative electrode sheets is improved,the problems of powder dropping and coating peeling off are effectively improved, the high-efficient automatic assembly of the lithium battery is realized, and the heat resistance and electrochemicalstability of the diaphragm are greatly improved.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery separator production, in particular to a preparation method of a ceramic-coated separator for lithium-ion batteries. Background technique [0002] In recent years, in response to the negative impacts such as environmental pollution and the sharp consumption of oil resources brought about by the rapid development of the automobile industry, countries are actively developing electric vehicles using clean energy. Among them, lithium-ion batteries are the main source of power for electric vehicles. In addition, lithium-ion batteries are also widely used in 3C, energy storage, power and other fields. The separator is one of the core key materials of lithium-ion batteries. Its function is to separate the positive electrode from the negative electrode material, allow lithium ions to pass through, and prevent electrons from passing through. The performance of the separator determines the int...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16H01M10/0525H01M50/403H01M50/451H01M50/489
CPCH01M10/0525H01M50/431H01M50/403H01M50/411H01M50/449Y02E60/10
Inventor 曹长城曹成群张继德张晓伟柴旺
Owner HENAN FUSEN NEW ENERGY TECH
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