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Production method of separation membrane used in lithium ion battery

A lithium-ion battery and production method technology, applied to battery pack components, circuits, electrical components, etc., can solve the problems that the thickness of the diaphragm cannot be less than 12 microns, it is not suitable for the use of lithium-ion battery diaphragms, and has a high melting point. Increased service life, high closed cell temperature, and cost reduction effects

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 thickness of the lithium-ion battery separator produced by this technology cannot be less than 12 microns
Chinese invention patent application CN200610025144.8 discloses a polyethersulfone microporous membrane, the microporous membrane has a relatively high melting point, so the closed cell temperature is relatively high, but the microporous membrane produced by the technology disclosed in the invention is suitable for filtration , not suitable for use as a separator for lithium-ion batteries

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0020] The preparation technology of separator for lithium ion battery of the present invention is as follows:

[0021] (1) PEEK, PEK, PI, PPS or PEI plastic particles with a calcium carbonate particle content of 10-70% without agglomeration and a certain particle size uniformly dispersed (the production process is as follows: a certain weight of PEEK, Put PEK, PI, PPS or PEI plastic particles into the hopper of the granulator, add nano calcium carbonate particles (Guangdong Jiawei Chemical Industry Co., Ltd., average particle size 5-50 nanometers) with 10%-70% of the weight of the plastic particles, After mixing evenly, granulate at a temperature of 410-480°C.)

[0022] (2) Put the PEEK, PEK, PI, PPS or PEI plastic particles dispersed with calcium carbonate in step 1 into the raw material inlet of the biaxial stretching film extruder, turn on the cooling water, and control the surface temperature of the casting cooling roll 20-30°C, select the appropriate extrusion die accor...

Embodiment 1

[0029] (1) Prepare PEEK plastic particles with a calcium carbonate content of 10% by weight of PEEK, non-agglomerated, and uniformly dispersed calcium carbonate particles with an average particle size of 20 nanometers: put the PEEK particles into the hopper of the granulator, and add PEEK plastic particles 10% by weight of nano-calcium carbonate particles (Guangdong Jiawei Chemical Industry Co., Ltd., with an average particle size of 20 nanometers), mixed evenly, and granulated at a temperature of 460 ° C.

[0030] (2) Put the PEEK plastic particles dispersed with calcium carbonate in step 1 into the raw material inlet of the biaxially stretched film extruder, turn on the cooling water, control the surface temperature of the casting cooling roll to 20--30°C, and extrude The outlet slit of the die head is selected to be 20 microns, and the equipment is started.

[0031] (3) Adjust the pulling speed of the film pulling machine to 100 meters per minute; control the stretching rat...

Embodiment 2

[0039] (1) Prepare PPS plastic particles with a calcium carbonate content of 70% by weight of PPS, non-agglomerated, and uniformly dispersed calcium carbonate particles with an average particle size of 5 nanometers: put the PPS particles into the hopper of the granulator, and add the PPS plastic particles 70% by weight of nano-calcium carbonate particles (Guangdong Jiawei Chemical Industry Co., Ltd., with an average particle size of 5 nanometers), after mixing evenly, granulate at a temperature of 430°C.

[0040] (2) Put the PPS plastic particles dispersed with calcium carbonate in step 1 into the raw material inlet of the biaxial stretching film extruder, turn on the cooling water, control the surface temperature of the casting cooling roll to 20--30°C, and extrude The outlet slit of the die head is selected to be 20 microns, and the equipment is started.

[0041] (3) Adjust the pulling speed of the film pulling machine to 180 meters per minute; control the stretching ratio o...

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Abstract

The invention discloses a production method of a separation membrane used in a lithium ion battery. The method comprises the steps that: high-melting-point plastic particles uniformly dispersed with nano-grade calcium carbonate particles are prepared; the plastic particles obtained in the step 101 are subjected to extrusion, casting and drawing; heat setting is carried out; the membrane obtained after heat setting is soaked by using an acid solution, such that calcium carbonate in the membrane is dissolved; and the membrane soaked by using the acid solution is subjected to washing and drying. According to the invention, the high-melting-point plastic particles dispersed with nano-grade calcium carbonate is subjected to extrusion, casting, drawing, and heat setting steps; the calcium carbonate is dissolved by using a dilute hydrochloric acid solution; and the obtained product is cleaned by washing and is bake-dried, such that the lithium-ion-battery-use separation membrane with high pore-closing temperature and low thickness can be obtained. With the separation membrane, lithium ion battery service life can be improved, and lithium ion battery cost can be reduced.

Description

[technical field] [0001] The invention relates to a lithium-ion battery diaphragm, in particular to a production method for a lithium-ion battery diaphragm. [Background technique] [0002] At present, the closure temperature of the diaphragm used in lithium-ion batteries is near the melting point of the diaphragm material used. This closing temperature is relatively low, which is not conducive to the normal operation of the lithium-ion battery. Chinese invention patent application CN201110102446.1 discloses a diaphragm containing a polyethylene layer. The closed cell temperature of the diaphragm is about 130° C., which is the melting point of polyethylene. The thickness of the lithium-ion battery diaphragm disclosed in this patent is limited by the materials used, and generally the thinnest can only be 16 microns. If it is thinner, the mechanical properties cannot be guaranteed. Chinese invention patent application CN200410078320.5 discloses a technical method for producin...

Claims

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Application Information

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IPC IPC(8): H01M2/16
CPCY02E60/10
Inventor 吕方龙戴晓兵
Owner ZHUHAI SMOOTHWAY ELECTRONICS MATERIALS