Preparation method of reinforced electrostatic spinning nano-fiber lithium-ion battery separator

A nanofiber membrane, lithium-ion battery technology, applied in textiles, papermaking, non-woven fabrics, etc., can solve the problems of short storage period and limited range, and achieve the effects of easy operation, smooth surface, and reduced internal resistance

Inactive Publication Date: 2013-12-25
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method improves the mechanical properties of the electrospun nanofiber separator to a certain extent, the polyurethane prepolymer must exist in the raw material, and the scope is limited, and the polyurethane prepolymer with highly reactive isocyanate groups Polymers are easily affected by moisture, etc., and have a short storage period

Method used

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  • Preparation method of reinforced electrostatic spinning nano-fiber lithium-ion battery separator
  • Preparation method of reinforced electrostatic spinning nano-fiber lithium-ion battery separator

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Dissolve PVDF and P(VDF-HFP) in a mass ratio of 0.95:0.05 in a mixed solvent with N.N-dimethylformamide and acetone at a mass ratio of 7; 3, and configure a solution with a mass fraction of 16%. Heat and stir at -50°C until the polymer is fully dissolved to obtain a spinning solution. The obtained spinning solution was injected into a syringe with a flat needle, the needle was connected to a high-voltage power supply, and the other end 20 cm away from the syringe was a grounded metal receiving device. Adjust the injection speed of the syringe pump to 0.1ml / h, and slowly increase the voltage to 15kv. The rice solution is sprayed out from the needle of the syringe, stretched under the action of a high-voltage electric field, and collected on the aluminum foil of the metal receiving device in the form of a fiber film, and the resulting non-woven film is placed in a vacuum drying oven, and it is operated at room temperature and reduced pressure for 10 hours. After there is...

Embodiment 2

[0038] Dissolve PAN and P(VDF-HFP) in N,N-dimethylformamide solvent at a mass ratio of 0.7:0.3, configure a solution with a mass fraction of 18%, heat and stir at 40-50°C until polymerization The substance is fully dissolved to obtain a spinning solution. The obtained spinning solution is injected into a syringe with a flat needle, the needle is connected to a high-voltage power supply, and the other end 15 cm away from the syringe is a grounded metal receiving device. Adjust the injection speed of the syringe pump to 0.8ml / h, and slowly increase the voltage to 18kv. The solution sprayed from the needle of the syringe is stretched under the action of a high-voltage electric field, and is collected in the form of a fiber film on the aluminum foil paper of the metal receiving device. After there is no residual solvent in the medium, take it out to obtain the PAN / P(VDF-HFP) composite nanofiber membrane

[0039] The prepared PAN / P(VDF-HFP) composite nanofiber membrane was placed...

Embodiment 3

[0042] Dissolve PMMA and PVDF at a mass ratio of 0.5:0.5 in a mixed solvent with N,N-dimethylacetamide and acetone at a mass ratio of 7:3, and prepare a solution with a mass fraction of 10%, at 40-50°C Heat and stir until the polymer is fully dissolved to obtain a spinning solution. The obtained spinning solution is injected into a syringe with a flat needle, the needle is connected to a high-voltage power supply, and the other end 25 cm away from the syringe is a grounded metal receiving device. Adjust the injection speed of the syringe pump to 1.0ml / h, and slowly increase the voltage to 20kv. The solution sprayed from the needle of the syringe is stretched under the action of a high-voltage electric field, and is collected in the form of a fiber film on the aluminum foil paper of the metal receiving device. After there is no residual solvent in the medium, take it out to obtain a PMMA / PVDF composite nanofiber membrane.

[0043] Put the prepared PMMA / PVDF composite nanofibe...

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Abstract

The invention provides a preparation method of a reinforced electrostatic spinning nano-fiber lithium-ion battery separator. The preparation method is characterized in that the reinforced electrostatic spinning nano-fiber lithium-ion battery separator is a composite film formed by two polymers with the differences of melting temperatures being more than 30 DEG C, the composite film is a nano-fiber film which is prepared from a spinning solution system formed by two polymers with the differences of melting temperatures being more than 30 DEG C through an electrostatic spinning technique, the fiber film is stilled for 10 hours under normal temperature under the negative pressure so as to evaporate organic solvents left in the fiber film, then the fiber film is subjected to hot-pressing treatment for a certain time under a certain pressure intensity, the hot-pressing temperature is between the melting temperature of the low-melt-point polymer and the melting temperature of the high-melt-point polymer, the low-melt-point polymer is fused to enable nano-fibers in the fiber film to be mutually bonded, so that the mechanical strength of the fiber film is greatly improved. The method is easy and convenient to operate, the prepared separator reserves the advantages of high porosity and high pick-up rate of an electrostatic spinning separator, and the defects of poor dynamic performance and non-existence of effective bonding points between fibers of the electrostatic spinning separator are also overcome.

Description

technical field [0001] The invention relates to the field of batteries, in particular to a method for preparing an electrospun lithium-ion battery diaphragm with excellent mechanical strength, high porosity and good thermal stability. Background technique [0002] Lithium-ion batteries have the advantages of high voltage, high specific energy, long life, no memory effect and low self-discharge rate, and are widely used as power sources for mobile phones, notebooks, small portable appliances and electric vehicles. Lithium batteries are mainly composed of positive electrodes, negative electrodes, electrolytes, separators, and casings. Among them, the diaphragm is an important part of the lithium-ion battery. Its main functions are: one is to prevent the passage of electrons and prevent short circuits between electrodes; the other is to allow ions to pass through, providing a channel for ion transport during the charging and discharging process of the battery. The performance ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D04H1/4382D04H1/728D04H1/541
Inventor 焦晓宁于宾严姣康卫民程博闻胡炳辉陈康
Owner TIANJIN POLYTECHNIC UNIV
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