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Method for producing pp/pe/pe/pp separators induced by uniaxial stretching

A technology of unidirectional stretching and diaphragm, which is applied in the direction of electrical components, circuits, battery pack components, etc., can solve the problems that cannot be effectively prevented, affect the performance of lithium batteries, and cause safety risks, so as to improve electrical conductivity and improve puncture Effects of strength, improved cycle performance, and lifespan

Active Publication Date: 2017-08-25
范建国
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The melting point of the existing polypropylene separator is 165°C. When the lithium battery generates short-circuit heat, the closing temperature of the pores is 145-150°C, which cannot effectively prevent and isolate thermal shock, affect the performance of the lithium battery and cause safety risks.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Uniaxial stretching initiates the method for producing PP / PE / PE / PP separator, comprises the following steps:

[0028] Step 1) Production of base film: Mix polyethylene glycol octylphenyl ether and PP material at a mass ratio of 1:45, then add PE material to co-extrude the film, and use the cast co-extrusion method to synthesize the co-extruded film Multi-layer structure base film, the temperature of the extruder in the casting co-extrusion method is 200°C, the temperature of the die head is 200°C, and the temperature of the cold roll is 50°C;

[0029] Step 2) unwinding: the base film produced in step 1 is wound on the steel coil core, and the winding speed is 30m / min;

[0030] Step 3) Preheating: Send the rolled base film into the aging chamber for aging and crystallization treatment. The high-temperature shelving time is 1 hour and the temperature is 80°C. The crystals produced during the casting process grow for a period of time to reach After stretching to form hole...

Embodiment 2

[0036] Uniaxial stretching initiates the method for producing PP / PE / PE / PP separator, comprises the following steps:

[0037] Step 1) Production of base film: Mix polyethylene glycol octylphenyl ether and PP material at a mass ratio of 1:45, then add PE material to co-extrude the film, and use the cast co-extrusion method to synthesize the co-extruded film Multi-layer structure base film, the temperature of the extruder in the casting co-extrusion method is 220°C, the temperature of the die head is 220°C, and the temperature of the cold roll is 75°C;

[0038] Step 2) unwinding: the base film produced in step 1 is wound on the steel coil core, and the winding speed is 60m / min;

[0039] Step 3) Preheating: Send the rolled base film into the aging chamber for aging and crystallization treatment. The high-temperature shelving time is 5 hours and the temperature is 100°C. The crystals produced during the casting process grow for a period of time to reach After stretching to form ho...

Embodiment 3

[0045] Uniaxial stretching initiates the method for producing PP / PE / PE / PP separator, comprises the following steps:

[0046] Step 1) Production of base film: Mix polyethylene glycol octylphenyl ether and PP material at a mass ratio of 1:45, then add PE material to co-extrude the film, and use the cast co-extrusion method to synthesize the co-extruded film Multi-layer structure base film, the temperature of the extruder in the casting co-extrusion method is 250°C, the temperature of the die head is 240°C, and the temperature of the cold roll is 100°C;

[0047] Step 2) unwinding: the base film produced in step 1 is wound on the steel coil core, and the winding speed is 100m / min;

[0048] Step 3) Preheating: Send the rolled base film into the aging chamber for aging and crystallization treatment. The high-temperature shelving time is 10 hours and the temperature is 130°C. The crystals produced during the casting process grow for a period of time to reach After stretching to form...

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Abstract

The invention discloses a method for producing a PP / PE / PE / PP diaphragm by uniaxial stretching, which comprises the following steps: base film production→unwinding→preheating→cold stretching→hot stretching→annealing and setting→winding. The present invention adds an amphiphilic compound to the PP material to improve the hydrophilicity of the microporous surface, and the hydrophilicity is persistent, so that the ability of the product to absorb electrolyte is greatly enhanced, and the conductivity of the lithium battery is improved.

Description

technical field [0001] The invention relates to the field of lithium battery diaphragms, in particular to a method for producing PP / PE / PE / PP diaphragms induced by uniaxial stretching. Background technique [0002] The role of the lithium battery separator is to separate the positive and negative active materials between the positive and negative electrodes, prevent the two electrodes from short circuit due to contact, and maintain the necessary electrolyte during the electrochemical reaction to form a channel for ion movement. [0003] Polyolefin lithium battery separator is an easy-to-process material, the product process is easy to control, and the product has good physical and chemical properties. It is widely used in the production of lithium batteries. The existing uniaxial stretching process uses polypropylene as the raw material, and the pore distribution is uneven and not dense during the pore forming process, resulting in low puncture strength of the product. When ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M2/14H01M2/16H01M50/403H01M50/417H01M50/489
CPCH01M50/403H01M50/411Y02E60/10
Inventor 范建国
Owner 范建国
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