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Method for producing ultrafine fiber diaphragm for lithium ion battery by electrostatic spinning

A technology for lithium-ion batteries and diaphragms, which is applied to battery components, circuits, electrical components, etc. It can solve the problems of increased strength of aramid nanofiber diaphragms, agglomeration of inorganic nanoparticles, and inability to form gels, etc., to achieve excellent absorption. Improvement of fluidity, cycle stability and safety, effect of improving safety and cycle stability

Inactive Publication Date: 2019-05-03
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these inorganic nanoparticles are prone to agglomeration, which has a great impact on the continuous preparation of fiber membranes by electrospinning technology.
The applicant team used the phenyl-POSS nanoparticle doping method to modify pure aramid nanofibers in the early stage. Due to the characteristics of the organic-inorganic hybrid structure of POSS particles, it has good compatibility with aramid emulsion. And the introduction of phenyl-POSS greatly increases the intensity of aramid fiber nanofiber separator, but it can not form gelation phenomenon (H.J.Zhao, et al., Effect of OctaphenylPolyhedral oligomeric silsesquioxane on the electrospun Poly-m-phenylene isophthalamid separators for lithium -ionbatteries with high safety and excellent electrochemical performance. Chemical Engineering Journal 356(2019) 11-21)
In addition, the applicant's team also promoted the gelation phenomenon by blending fluorine-containing emulsion (Ollie Fluoro) (ZL201610889960.7) in the early stage, but the fluorine-containing emulsion is a water-based emulsion, which is different from the organic system. When mixing aramid emulsion, a slight excess of fluorine-containing emulsion will easily cause aramid solute precipitation

Method used

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  • Method for producing ultrafine fiber diaphragm for lithium ion battery by electrostatic spinning
  • Method for producing ultrafine fiber diaphragm for lithium ion battery by electrostatic spinning
  • Method for producing ultrafine fiber diaphragm for lithium ion battery by electrostatic spinning

Examples

Experimental program
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Effect test

Embodiment 1

[0024] (1) Dissolve the aramid fiber emulsion with a solubility of 20wt% in dimethylacetamide (the volume ratio of the two is 1:5) organic solvent, then utilize a magnetic stirrer to stir at room temperature for 6 hours to form a uniform mixture solution, then add a certain amount of nonafluorohexyl F-POSS nanoparticles (with the ratio of aramid fiber mass is 2: 100) in the aramid fiber / dimethylacetamide mixed solution, and then form the doped nonafluoro The mixture of hexyl F-POSS was stirred at high speed for 12 hours at room temperature to form a uniform and stable spinning solution.

[0025] (2) Slowly add the spinning solution configured in the above step (1) into the syringe, the inner diameter of the needle used is 0.35mm, and the extrusion rate of the needle solution is 0.4mL h -1 . A rotating cylinder covered with aluminum foil serves as a receiving device, and the receiving distance between the syringe tip and the collector is 16 cm. During the electrospinning proc...

Embodiment 2

[0028] (1) Dissolve the aramid fiber emulsion with a solubility of 20wt% in dimethylacetamide (the volume ratio of the two is 1:5) organic solvent, then utilize a magnetic stirrer to stir at room temperature for 6 hours to form a uniform mixture solution, and then add a certain amount of tridecafluorooctyl F-POSS nanoparticles to the aramid / dimethylacetamide mixture (ratio to aramid mass is 2:100), and then the formed doped The mixture of tridecafluorooctyl F-POSS was stirred at high speed for 12 hours at room temperature to form a uniform and stable spinning solution.

[0029] (2) Slowly add the spinning solution configured in the above step (1) into the syringe, the inner diameter of the needle used is 0.35mm, and the extrusion rate of the needle solution is 0.4mL h -1. A rotating cylinder covered with aluminum foil serves as a receiving device, and the receiving distance between the syringe tip and the collector is 16 cm. During the electrospinning process, the applied el...

Embodiment 3

[0032] (1) Dissolve the aramid fiber emulsion with a solubility of 20wt% in dimethylacetamide (the volume ratio of the two is 1:5) organic solvent, then utilize a magnetic stirrer to stir at room temperature for 6 hours to form a uniform mixture solution, and then add a certain amount of heptadecafluorodecyl F-POSS nanoparticles to the aramid / dimethylacetamide mixture (ratio to aramid mass is 2:100), and then the formed doped The mixture of heptadecafluorodecyl F-POSS was stirred at high speed for 12 hours at room temperature to form a uniform and stable spinning solution.

[0033] (2) Slowly add the spinning solution configured in the above step (1) into the syringe, the inner diameter of the needle used is 0.35mm, and the extrusion rate of the needle solution is 0.4mL h -1 . A rotating cylinder covered with aluminum foil serves as a receiving device, and the receiving distance between the syringe tip and the collector is 16 cm. During the electrospinning process, the appli...

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Abstract

The present invention relates to a method for producing an ultrafine fiber diaphragm for a lithium ion battery by electrostatic spinning. The method is characterized in that the diaphragm for a lithium ion battery is formed by performing electrostatic spinning on an aramid polymer doped with fluorine-containing polysilsesquioxane (F-POSS) nano-particles having an organic-inorganic hybrid structure. The method for preparing the aramid polymer diaphragm doped with the F-POSS for the lithium ion battery comprises the following steps: 1) configuring and uniformly stirring the aramid emulsion prepared by a low-temperature polymerization method, a dimethylacetamide solvent, and the F-POSS nano-particles according to a certain ratio; 2) preparing the aramid nanofiber diaphragm doped with F-POSS by the electrostatic spinning technology; and 3) drying the aramid nanofiber diaphragm doped with F-POSS in a vacuum oven. The method has a simple process and high production efficiency. The prepared F-POSS-doped aramid polymer diaphragm for the lithium ion battery has an ultrafine fiber network structure, good lyophilicity, excellent thermal stability and an excellent mechanical property, and contributes to the enhancement of the diaphragm ionic conductivity and the improvement of the cycle stability of the battery.

Description

technical field [0001] The invention relates to a lithium ion battery, in particular to a method for preparing an aramid polymer separator doped with F-POSS nanoparticles for a lithium ion battery, and belongs to the technical field of nanofibrous membrane preparation. Background technique [0002] The emergence of energy crisis and the aggravation of environmental pollution make the development of safe, non-toxic and high specific energy green energy materials particularly necessary. The research and development of lithium-ion batteries are in line with this trend. It has the advantages of high specific energy, long cycle life, less environmental pollution, and no memory effect. It is widely used in new energy vehicles, aerospace, and various electric tools. fields are becoming more and more popular. Lithium-ion battery separator is a key component of lithium-ion batteries, and it is a vital component that affects the electrochemical and safety performance of lithium-ion b...

Claims

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Application Information

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IPC IPC(8): H01M2/16H01M2/14H01M50/403H01M50/44H01M50/489
CPCY02E60/10
Inventor 程博闻赵慧娟康卫民邓南平庄旭品
Owner TIANJIN POLYTECHNIC UNIV
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