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Preparation method of high content glass fiber filled polypropylene battery diaphragm

A high-content glass fiber and battery separator technology, which is applied to battery components, separators/films/diaphragms/spacers, circuits, etc., can solve the problems of poor ion permeability selectivity and the need for improvement of polypropylene separators, etc. Achieve uniform pore size distribution, superior safety performance, and good heat resistance

Active Publication Date: 2017-04-19
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the thermal stability and mechanical properties of polypropylene separators need to be improved, especially in high-temperature lithium-ion batteries, the separator needs to have better thermal stability to maintain the pore structure of the separator
In addition, the pores of polypropylene separators generally have poor ion permeability selectivity for adsorbed electrolytes.

Method used

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  • Preparation method of high content glass fiber filled polypropylene battery diaphragm
  • Preparation method of high content glass fiber filled polypropylene battery diaphragm
  • Preparation method of high content glass fiber filled polypropylene battery diaphragm

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Weigh 100 g of glass fiber into a glass bottle, and use absolute ethanol and ultrapure water to prepare 95% ethanol aqueous solution. Add 1g (1wt%) silane coupling agent (KH-570) into 300mL ethanol aqueous solution, mix well, add to glass fiber, stir with mechanical stirrer for 24h, filter and remove the solution to obtain modified glass fiber. Put the polypropylene (PP) pellets and modified glass fiber (KH570-g-GF) into an electric constant temperature blast oven, and dry at 110°C for 24 hours to remove the moisture in the raw materials. Weigh PP and modified glass fiber at a certain mass ratio (the mass content of KH570-g-GF is 2%, 5%, 10%, and 20% respectively), and then make the modified glass fiber and PP pellets through a high-speed mixer. After the initial mixing of the materials, they were added to an internal mixer for melt blending for 10 minutes, and the extruded materials were crushed into masterbatches using a plastic crushing and granulating machine. Use ...

Embodiment 2

[0045]Weigh 100 g of glass fiber into a glass bottle, and use absolute ethanol and ultrapure water to prepare 95% ethanol aqueous solution. Add 1g (1wt%) of silane coupling agent (KH-550) into 300mL ethanol aqueous solution, mix thoroughly, add to glass fiber, stir with mechanical stirrer for 24h, filter and remove the solution to obtain modified glass fiber. Put the polypropylene (PP) pellets and modified glass fiber (KH550-g-GF) into an electric heating constant temperature blast oven, and dry at 110°C for 24 hours to remove the moisture in the raw materials. The KH550-g-GF and PP raw materials are fed according to the mass ratio of 1:4, and pre-mixed by a high-speed mixer. Add it into an internal mixer for melt blending for 10 minutes, and crush the extruded material into masterbatches using a plastic crushing granulator. Use a torque rheometer for extrusion molding. The die size of the extruder is 10mm×2mm. The die is connected with a drafting machine to draw the sheet in...

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Abstract

Belonging to the technical field of battery diaphragm preparation, the invention specifically discloses a preparation method of a high content glass fiber filled polypropylene battery diaphragm. The method includes the steps of: S1. adding glass fiber into an ethanol aqueous solution containing a silane coupling agent to conduct soaking, then performing filtering and drying to obtain modified glass fiber; S2. blending the modified glass fiber obtained by S1 with polypropylene to prepare a blended material, and subjecting the blended material to melt extrusion so as to obtain master batch; S3. conducting extrusion molding on the master batch obtained in S2, and carrying out drafting to obtain a modified glass fiber polypropylene composite material; and S4. stretching the composite material obtained in S3 to prepare a porous film, soaking the porous film in a polar polymer solution, and performing drying, thus obtaining the polypropylene battery diaphragm. The glass fiber filled polypropylene battery diaphragm prepared by the method provided by the invention has the advantages of uniform pore size distribution, good heat resistance, high mechanical strength and superior safety performance, also has high ion selectivity, and is expected to be applied in power batteries, high temperature lithium ion batteries, lithium sulfur batteries, lithium air batteries and other fields.

Description

technical field [0001] The invention belongs to the technical field of battery diaphragm preparation, and more specifically relates to a preparation method of a polypropylene battery diaphragm filled with high content glass fiber. Background technique [0002] With the development of power battery research, the diaphragm material, which is one of the key components of the battery, has also received increasing attention. Usually, the separator is located between the two electrodes of the battery, which plays the role of absorbing the electrolyte and conducting ions, and at the same time prevents the risk of short-circuit burning of the battery. Generally speaking, high safety and reliability is an important condition for the widespread promotion of battery technology, so the selection and manufacture of separator materials are crucial. High electrochemical and thermal stability, rich and uniform porous structure are important properties of good separators. Polypropylene is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16H01M50/403H01M50/417
CPCH01M50/40H01M50/403H01M50/44H01M50/409H01M50/431Y02E60/10
Inventor 黄逸夫阮文红王亮容敏智章明秋
Owner SUN YAT SEN UNIV
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