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Method for triggering production of PE/PE/PE structure high-strength diaphragm through unilateral stretching

A unidirectional stretching, high-strength technology, applied in the direction of separators/films/diaphragms/spacers, structural parts, electrical components, etc., can solve problems such as inability to effectively prevent, affect the performance of lithium batteries, and cause safety risks, etc. Achieve the effect of improving cycle performance and life, improving puncture strength, and improving hole tortuosity

Inactive Publication Date: 2015-12-16
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

[0028] Uniaxial stretching initiates the method for producing PE / PE / PE structure high-strength diaphragm, comprises the following steps:

[0029] Step 1) Production of base film: Mix three PE materials with melting index of 0.35, 0.5 and 1.0, then add polyethylene glycol octyl phenyl ether, polyethylene glycol octyl phenyl ether to the mixed material The mass ratio of the mixed material with PE is 1:45, and the multi-layer structure base film is produced by a casting co-extrusion method. Temperature 50°C;

[0030] Step 2) unwinding: the base film produced in step 1 is wound on the steel coil core, and the winding speed is 30m / min;

[0031] Step 3) Preheating: Send the rolled base film into the aging chamber for aging and crystallization treatment. The high temperature treatment time is 1 hour and the temperature is 80°C. The crystals produced during the casting process will grow for a period of time. When the elasticity of the basement membrane reaches 60%, the growth is com...

Embodiment 2

[0037] Uniaxial stretching initiates the method for producing PE / PE / PE structure high-strength diaphragm, comprises the following steps:

[0038] Step 1) Production of base film: Mix three PE materials with melting index of 0.35, 0.5 and 1.0, then add polyethylene glycol octyl phenyl ether, polyethylene glycol octyl phenyl ether to the mixed material The mass ratio of the mixed material with PE is 1:45, and the multi-layer structure base film is produced by a casting co-extrusion method. Temperature 80°C;

[0039] Step 2) unwinding: the base film produced in step 1 is wound on the steel coil core, and the winding speed is 60m / min;

[0040] Step 3) Preheating: Send the rolled base film into the aging chamber for aging and crystallization treatment. The high temperature treatment time is 5 hours and the temperature is 100°C. The crystals produced during the casting process will grow for a period of time. When the elasticity of the basement membrane reaches 80%, the growth is c...

Embodiment 3

[0046] Uniaxial stretching initiates the method for producing PE / PE / PE structure high-strength diaphragm, comprises the following steps:

[0047] Step 1) Production of base film: Mix three PE materials with melting index of 0.35, 0.5 and 1.0, then add polyethylene glycol octyl phenyl ether, polyethylene glycol octyl phenyl ether to the mixed material The mass ratio of the mixed material with PE is 1:45, and the multi-layer structure base film is produced by a casting co-extrusion method. Temperature 100°C;

[0048] Step 2) unwinding: the base film produced in step 1 is wound on the steel coil core, and the winding speed is 100m / min;

[0049] Step 3) Preheating: Send the rolled base film into the aging chamber for aging and crystallization treatment. The high temperature treatment time is 10 hours and the temperature is 125°C. The crystals produced during the casting process will grow for a period of time. When the elasticity of the basement membrane reaches 90%, the growth i...

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PUM

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Abstract

The invention discloses a method for triggering production of a PE / PE / PE structure high-strength diaphragm through unilateral stretching. The method includes the following steps of base diaphragm production, unrolling, preheating, cold stretching, hot stretching, annealing sizing and rolling. According to the method, amphiphilic compounds are added in PE materials, the hydrophilicity on the surfaces of micropores is improved, lasting hydrophilicity is achieved, the capacity of the product for adsorbing electrolyte is greatly enhanced, and the conductivity of lithium batteries is improved.

Description

technical field [0001] The invention relates to the field of polypropylene diaphragms, in particular to a method for producing high-strength diaphragms with a PE / PE / PE structure 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 stren...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16H01M10/052H01M50/403H01M50/417H01M50/457H01M50/489H01M50/491
CPCH01M10/052H01M50/40H01M50/409Y02E60/10
Inventor 范建国
Owner 范建国
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