Method for producing separation membrane, and said separation membrane and battery using same

A separator and electrochemical technology, which is applied in the field of electrochemical batteries, can solve the problems of inability to apply matrix membranes and limitations of matrix membrane components, and achieve the effects of improving stability, suppressing internal short circuits, and prolonging service life

Inactive Publication Date: 2015-08-26
SAMSUNG SDI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method is limited in that the composition of the base film is limited to a specific material, and there is also a problem that the method cannot be applied to various base films.

Method used

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  • Method for producing separation membrane, and said separation membrane and battery using same
  • Method for producing separation membrane, and said separation membrane and battery using same
  • Method for producing separation membrane, and said separation membrane and battery using same

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0106] 30 parts by weight of high-density polyethylene (High-density polyethylene, HDPE; Mitsui Chemical) having a weight average molecular weight (Mw) of 600,000 g / mol was supplied into a twin-screw extruder, and then 70 parts by weight Parts of fluid paraffin (Ace West Chemical Co.) were introduced into a twin-screw extruder, followed by extrusion.

[0107] After extrusion, the gel phase obtained by the T-die is fabricated into a separator in the form of a sheet using chilled rolls. When making a sheet, casting is performed by adjusting the speed of the cooling roll so that the film forming factor of the casting device is 1. Next, the sheet was stretched so that the stretching machine longitudinally stretched by a factor of 5, and then stretching was performed once on the sheet so that the stretching machine transversely stretched by a factor of 5.

[0108] The stretched polyethylene matrix film was washed with dichloromethane (Samsung Fine Chemicals) to extract fluid paraf...

example 2

[0110] A polyolefin porous separator was prepared in the same manner as in Example 1, except that the film forming factor of the casting equipment, the longitudinal stretch factor of the stretcher, and the transverse stretch factor of the stretcher were set to 2, 4, and 6.25, respectively.

example 3

[0112] A polyolefin porous separator was prepared in the same manner as in Example 1, except that the film forming factor of the casting equipment, the longitudinal stretch factor of the stretcher, and the transverse stretch factor of the stretcher were set to 3, 4, and 8, respectively.

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Abstract

The present invention relates to a method for producing a polyolefin-based porous separation membrane and, more particularly, to a method for producing a separation membrane having improved tensile strength and thermal shrinkage rate by adjusting the stretching factor of a base film during the casting and stretching processes of a separation membrane production process. Also, the present invention relates to a polyolefin-based porous separation membrane having a small difference in tensile strength between the longitudinal direction and the transverse direction of the separation membrane, excellent tensile strength, and improved thermal shrinkage rate and improved puncture strength. Further, the present invention relates to an electrochemical battery of which the dimensional stability under heat and tension is improved using the separation membrane.

Description

technical field [0001] The present invention relates to a method of making a separator having excellent tensile strength for an electrochemical cell, and a separator made by said method. Furthermore, the invention relates to an electrochemical cell comprising said separator. Background technique [0002] A separator for an electrochemical cell refers to an intermediate membrane that separates a cathode and an anode from each other in a battery while maintaining ion conductivity so that the battery can be charged / discharged. [0003] Recently, with the trend of pursuit of light weight and miniaturization of electrochemical batteries to improve portability of electronic equipment, high-power high-capacity batteries for electric vehicles are required. Therefore, separators for batteries are required to have reduced thickness and weight and excellent dimensional stability under heat and high tension, thereby improving productivity of high-capacity batteries. [0004] In order ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M10/058H01M50/406H01M50/417H01M50/489H01M50/494
CPCH01M2/166H01M2/1653Y02T10/7011H01M10/052H01M2/145H01M10/0525H01M10/058H01M50/446H01M50/489H01M50/417H01M50/494H01M50/406Y02E60/10Y02P70/50H01M50/403H01M50/491H01M50/463
Inventor 赵宰贤金箕旭李相镐李正承张锭洙郑准镐
Owner SAMSUNG SDI CO LTD
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