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Polydopamine surface-modified polyethersulfone nanofiber composite diaphragm, preparation method and application

A nanofiber film and nanofiber technology, applied in electrical components, electrochemical generators, circuits, etc., can solve the problems of unfavorable lithium ion migration, poor high temperature dimensional stability, poor electrolyte infiltration performance, etc., and achieve electrolyte infiltration Effect of improved properties, high porosity, good application potential

Active Publication Date: 2016-08-31
吉林省聚科高新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although polyolefin separators are widely used, their porosity is low, generally around 40%.
The wettability of the electrolyte is poor, which is not conducive to the migration of lithium ions and hinders the improvement of battery performance
More importantly, polyolefin materials have a low melting point and poor dimensional stability at high temperatures, posing serious safety hazards

Method used

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  • Polydopamine surface-modified polyethersulfone nanofiber composite diaphragm, preparation method and application
  • Polydopamine surface-modified polyethersulfone nanofiber composite diaphragm, preparation method and application
  • Polydopamine surface-modified polyethersulfone nanofiber composite diaphragm, preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The preparation method of polyethersulfone nanofibrous membrane comprises the following steps: dissolving polyethersulfone (brand E3010, molecular weight 60,000) purchased from BASF in Germany in N,N-dimethylacetamide, magnetic stirring for 30min, and preparing The electrospinning solution with a mass fraction of 20% was filtered through a syringe filter with a specification of 25mm*0.45μm to remove impurities, and after standing for degassing for 30mim, a polyethersulfone nanofiber membrane was prepared by high-voltage electrospinning technology.

[0030] High-voltage electrospinning parameters: temperature 25°C, humidity 30%, needle diameter 1.5mm, voltage 20kv, injection pump injection rate 1.5mL / h, spinning time 2h, PET non-woven fabric as the receiving plate, receiving distance 15cm.

[0031] The thickness of the obtained polyethersulfone nanofiber membrane was 30 μm ( figure 1 (a)); fiber diameter between 200 ~ 400nm ( figure 2 (a)); n-butanol test porosity meth...

Embodiment 2

[0033] As in Example 1, an electrospinning solution with a mass fraction of 25% was prepared, and a polyethersulfone nanofiber membrane was prepared according to the same spinning conditions as in Example 1. Compared with the fiber membrane prepared in Example 1, as the concentration of the spinning solution increases, the fiber diameter increases, and the distribution of fiber diameter also increases accordingly. The fiber diameter is between 220 and 430nm; the porosity of the fiber membrane is about 82%; the fiber membrane tensile strength, elongation at break, contact angle between the fiber membrane and the electrolyte ethylene carbonate (EC), and thermal dimensions under high temperature conditions The stability was similar to the nanofibrous membrane obtained in Example 1.

Embodiment 3

[0035]As in Example 1, the spinning voltage was adjusted to 25 kv, and the polyethersulfone nanofiber membrane was prepared according to the same method and steps as in Example 1. The polyethersulfone nanofiber membrane was prepared according to the same spinning conditions as in Example 1. With the increase of the spinning voltage, the fiber diameter increases, and the porosity of the fiber membrane decreases, and the porosity is about 80%. Its electrolyte wettability and thermal dimensional stability are relatively close to those of the fiber membrane prepared in Example 1.

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Abstract

A novel polydopamine surface-modified polyethersulfone nanofiber composite membrane for lithium-ion batteries, a preparation method and its application in lithium-ion batteries belong to the technical field of lithium-ion battery materials. The present invention mainly adopts electrospinning method to prepare polyethersulfone nanofiber membrane with high porosity, and then uniformly coats polydopamine on the surface of nanofiber through in-situ polymerization method to prepare polydopamine surface-modified polyethersulfone nanofiber Composite diaphragm. As a result, the composite separator has both structural and performance advantages such as excellent heat resistance, wetting performance, and high porosity. From the perspective of lithium battery separators, the performance of lithium-ion batteries can be improved.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery materials, and in particular relates to a novel polydopamine surface-modified polyethersulfone nanofiber composite diaphragm for lithium-ion batteries, a preparation method and its application in lithium-ion batteries. Background technique [0002] The main function of lithium ion battery separator is to prevent internal short circuit, absorb electrolyte and provide lithium ion conductive path through the interconnected porous structure. The performance of the separator directly affects the performance of the battery and plays a vital role in the safety of the battery. Currently commercialized lithium battery separators are mainly polyolefin materials, which are prepared by unidirectional or biaxial stretching. Although polyolefin separators are widely used, their porosity is relatively low, generally around 40%. The wettability of the electrolyte is poor, which is not conducive to t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M2/16H01M50/403H01M50/44
CPCH01M10/0525H01M50/411H01M50/44H01M50/403Y02E60/10
Inventor 白迪
Owner 吉林省聚科高新材料有限公司
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