Polyalkylene microporous diaphragm for lithiam ion battery and manufacturing method thereof

A lithium-ion battery, microporous technology, applied in battery pack parts, chemical instruments and methods, circuits, etc., can solve the problem of poor elastic recovery of single-layer microporous polyethylene film, low production performance and use performance, and easy generation of batteries. Stretching and other problems, to achieve the effect of improving heat resistance, simple manufacturing process, and not easy to curl

Inactive Publication Date: 2007-07-18
许贵斌
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

Polyethylene (PE) Micrometric Multifunctional Film with High Permeance Gas Membranes (MFGMs), made through different methods like thermal induction or solvent evaporation techniques have been developed over past several decades ago. These films allow gas molecules to pass easily due to their small holes formed during production. They provide superior properties compared to traditional separators used today but they still suffer from issues related to long term stability under extreme conditions when exposed to harsh environments.

Problems solved by technology

Technological Problem addressed in this patented technical problem relates to finding ways to improve the properties required of leather/polyimide composite microporthane plugs while ensuring safe handling during fabrications processes involving lamination and sealing layers on electronic devices.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] In polypropylene (M w =4.8×10 5 , The melt index is 2.1, the melting point is 170°C), 30% of the ethylene-propylene copolymer is added for blending and granulation, and then 25% of the weight unit ratio of this blend is added to one of the twin-screw extruders (Φ58mm, L / D=48, high-shear form), and 75% of the weight unit ratio of liquid paraffin is added to the twin-screw extruder through lateral feeding, and the polypropylene blend is made at 250 in the twin-screw extruder. The liquid paraffin was melted and mixed under the conditions of ℃ and 200 rpm to form a polypropylene blend solution. The obtained solution was extruded from the two surface layers of the three-layer die through a metering pump, and the thickness of each layer was about 170 μm.

[0056] At the same time, 25% weight unit proportion of high-density polyethylene (ρ = 0.968g / cm 3 , M w =3.5×10 5 ) Add another twin-screw extruder (Φ58mm, L / D=48, high-shear form), and 75% of the weight unit ratio of liquid pa...

Embodiment 2

[0059] The polypropylene (M w =4.8×10 5, Melt index 2.1, melting point 170℃) was added to one of the twin-screw extruders (Φ58mm, L / D=48, high-shear mode), and 75% of the weight unit ratio of liquid paraffin was added through lateral feeding Twin-screw extruder, by melting polypropylene at 250℃ and 200rpm and mixing liquid paraffin in the twin-screw extruder to form a polypropylene solution. The obtained solution is passed from the two surface layers of the three-layer die through a metering pump Extrusion, the thickness of each layer is 170μm.

[0060] At the same time in the high-density polyethylene (ρ = 0.958g / cm 3 , M w =6.8×10 5 ) Was added 35% of ethylene-propylene copolymer for blending and granulation, and then 25% of the weight unit ratio of this mixture was added to a twin-screw extruder (Φ58mm, L / D=48, high shear mode), and 75 The liquid paraffin of the percentage by weight is added to the twin-screw extruder through lateral feeding, and the polyethylene is melted and ...

Embodiment 3

[0063] The polypropylene (M w =4.8×10 5 , Melt index 2.1, melting point 170℃) was added to one of the twin-screw extruders (Φ58mm, L / D=48, high-shear mode), and 75% of the weight unit ratio of liquid paraffin was added through lateral feeding Twin-screw extruder, by melting polypropylene at 250℃ and 200rpm and mixing liquid paraffin in the twin-screw extruder to form a polypropylene solution. The obtained solution is passed from the two surface layers of the three-layer die through a metering pump Extrusion, the thickness of each layer is 170μm.

[0064] At the same time in the high-density polyethylene (ρ = 0.958g / cm 3 , M w =6.8×10 5 ) Was added 30% of ethylene-propylene copolymer for blending and granulation, and then 25% of the weight unit ratio of this mixture was added to a twin-screw extruder (Φ58mm, L / D=48, high shear mode), and 75 The liquid paraffin of the percentage by weight is added to the twin-screw extruder through lateral feeding, and the polyethylene is melted and...

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Abstract

This invention discloses a micro-porous membrane of POLYALLYLALCOHOL/TiO2 for lithium-ion battery and its manufacturing method, which uses multilayer materials, formed by overlapping of a layer of polyethylene, PP and others, and improved heat-induced phase separation process to make the overall structure of polyolefin multilayer micro-porous membrane. In the neighboring layers of polyethylene and polypropylene, at least one layer contains a certain amount of ethylene-propylene copolymer to improve their compatibility. Its advantages are: 1) this structure realizes lower shutting hole and higher breaking film temperature without affecting other performance, to enhance the temperature and safety of the membrane. 2) The membrane is not easy to curl with high resistance and high mechanical strength to external injury, increasing the reliability of processing and use. 3) The simple manufacturing process can be realized only on the basis of the general heat-induced phase separation.

Description

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Claims

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Application Information

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Owner 许贵斌
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