Production method of lithium ion battery separation film

A technology of lithium-ion batteries and production methods, which is applied to battery components, circuits, electrical components, etc., can solve problems such as short circuit, high thermal shrinkage rate, and unfavorable safety of lithium-ion batteries, so as to increase the rupture temperature and reduce the Thickness, safety improvement effect

Inactive Publication Date: 2013-06-26
ZHUHAI SMOOTHWAY ELECTRONICS MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The thermal shrinkage rate of the separator made of polyolefin material is very high. After stretching, the thermal shrinkage rate will be even higher. At a constant temperature of 120°C for 1 hour, the thermal shrinkage rate of the polyolefin separator in the stretching direction exceeds 3%, and the thermal shrinkage rate is too high. High, unfavorable to the safety of lithium-ion batteries, easy to cause short circuit

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) The polyphenylene sulfide particles are melted and extruded through the extrusion die of the film biaxial stretching machine, the extrusion temperature is 300°C, and the slit width of the extrusion die is 20 microns.

[0024] (2) Pass through the cooling roll after extrusion, and the surface temperature of the cooling roll is controlled at 20°C to form a casting film.

[0025] (3) Keep the cast film at a constant temperature of 80°C for 5 minutes.

[0026] (4) The polyphenylene sulfide film after constant temperature is sent to a vertical and horizontal bidirectional stretching machine for stretching. The stretching ratio of the transverse stretching is 5, and the stretching ratio of the longitudinal stretching is 8.

[0027] (5) The stretched polyphenylene sulfide was rolled up and heat-set in an incubator. The heat-setting temperature was 230° C. and the setting time was 5 minutes to obtain a lithium-ion battery microporous separator.

[0028] After testing, the ...

Embodiment 2

[0030] (1) The polyphenylene sulfide particles are melted and extruded through the extrusion die of the film biaxial stretching machine, the extrusion temperature is 380°C, and the slit width of the extrusion die is 100 microns.

[0031] (2) Pass through the cooling roll after extrusion, and the surface temperature of the cooling roll is controlled at 80°C to form a casting film.

[0032] (3) Keep the cast film at a constant temperature of 50°C for 10 minutes.

[0033] (4) Stretch the polyphenylene sulfide film after constant temperature, the stretching ratio of transverse stretching is 6, and the stretching ratio of longitudinal stretching is 9.

[0034] (5) The stretched polyphenylene sulfide was wound up and heat-set in an incubator. The heat-setting temperature was 260° C. and the setting time was 15 minutes to obtain a lithium-ion battery microporous separator.

[0035] After testing, the obtained polyphenylene sulfide microporous membrane has an average pore diameter of...

Embodiment 3

[0037] (1) The polyphenylene sulfide particles are melted and extruded through the extrusion die of the film biaxial stretching machine, the extrusion temperature is 320°C, and the slit width of the extrusion die is 30 microns.

[0038] (2) Pass through the cooling roll after extrusion, and the surface temperature of the cooling roll is controlled at 30°C to form a casting film.

[0039] (3) Keep the cast film at a constant temperature of 70°C for 15 minutes.

[0040] (4) Stretch the polyphenylene sulfide film after constant temperature, the stretching ratio of transverse stretching is 4, and the stretching ratio of longitudinal stretching is 8.

[0041] (5) The stretched polyphenylene sulfide was wound up and heat-set in an incubator. The heat-setting temperature was 200° C. and the setting time was 20 minutes to obtain a lithium-ion battery microporous separator.

[0042] After testing, the obtained polyphenylene sulfide microporous membrane has an average pore diameter of ...

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Abstract

The invention discloses a production method of a lithium ion battery separation film. The method comprises the steps that: polyphenylene sulfide is subjected to melt extrusion, wherein an extrusion die head slit width is 5-500 micrometers; extruded polyphenylene sulfide is processed by using a cooling roll, such that a cast film is formed; the polyphenylene sulfide cast film is drawn, and heat setting is carried out. According to the invention, polyphenylene sulfide is extruded, and is drawn under a preset temperature; a drawing ratio is controlled, such that a micro-pore average size regulating effect is achieved. With the method, the thickness of producible lithium ion battery separation film is reduced, resource is effectively saved, lithium ion battery separation film breakage temperature is increased, and lithium ion battery separation film safety is improved.

Description

[technical field] [0001] The invention relates to a lithium-ion battery separator, in particular to a production method of a lithium-ion battery separator. [Background technique] [0002] The mechanism of the stretching pore-forming process is that when the polymer is in a semi-crystalline state and there are crystalline and non-crystalline regions inside, the mechanical properties of the crystalline and non-crystalline regions are different. When the polymer is stretched, the non-crystalline region is overstretched and partially fractured to form micropores, while the crystalline region remains as the skeleton of the microporous region. [0003] Wang Lihua et al. (Research on Polyphenylene Sulfide Hollow Fiber Microfiltration Membrane, Journal of Textile Science, 25(1), 25-27) studied the effect of stretching process on the pore-forming performance of PPS hollow fiber. Such hollow fiber membrane can be used as a filter Membranes are used, but they cannot be used as separat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16
CPCY02E60/10
Inventor 吕方龙戴晓兵
Owner ZHUHAI SMOOTHWAY ELECTRONICS MATERIALS
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