Separation membrane comprising coating layer and battery using same

Inactive Publication Date: 2015-06-04
SAMSUNG SDI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a separator with improved melt-down temperature and thermal resistance. The coating layer of the dried separator has a low solvent residual amount, which does not reduce air permeability, and compensates for the thermal sensitivity of polyolefin. The coating composition has excellent solubility in a low boiling point solvent and simplifies the process and cost saving. The separator has strong resistance to thermal shrinkage and improves the stability and extended life of the battery. The polyamic acid used in the coating composition improves the preparation processability of a coating layer of a mixture of organic and inorganic materials.

Problems solved by technology

However, the organic binder having high thermal resistance does not dissolve in a low boiling point solvent, which later causes a problem of not properly performing a drying process of the solvent after coating a separator.
Moreover, this not only decreases air permeability of a separator, but also reduces compatibility with other coating agent components added together so as to make it difficult to be substantially utilized as a coating agent.

Method used

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  • Separation membrane comprising coating layer and battery using same
  • Separation membrane comprising coating layer and battery using same
  • Separation membrane comprising coating layer and battery using same

Examples

Experimental program
Comparison scheme
Effect test

example 1

(1) Preparation of Coating Composition

[0134]0.5 mol of 3,3′-diamino diphenyl sulfone (DDS), and N,N-dimethylacetamide (DMAc) were placed in a four-neck flask equipped with a stirrer, a temperature controlling device, a nitrogen gas injection device, and a condenser while passing nitrogen therethrough, and dissolved with stirring. Next, 0.5 mol of pyromellitic dianhydride (PMDA) in a solid state was added to the solution, and the solution was vigorously stirred. Herein, the solid content by mass ratio was 20% by weight, and the reaction proceeded for 24 hours while maintaining the temperature less than 25° C. to prepare a polyamic acid solution.

[0135]In order to prepare an inorganic dispersion, 25% by weight of Al2O3 (LS235, Nippon Light Metal Company, Ltd.) was added to acetone (Daejung Chemical & Metals Co., Ltd.), and milled at 25° C. for 3 hours using a beads mill to be dispersed, thereby preparing an inorganic dispersion.

[0136]The thus prepared, polyamic acid solution and inorga...

example 2

[0138]The separator was prepared by the same method as in above Example 1, except that 1,6-hexamethylenediamine was placed in the four-neck flask instead of 3,3′-diaminodiphenylsulfone, and the mixing was carried out in a weight ratio of the prepared polyamic acid solution:N,N-dimethylacetamide (DMAc):inorganic dispersion:acetone=0.9:1.5:4.1:3.5, in the preparation of the coating composition.

example 3

[0139]The separator was prepared by the same method as in above Example 1, except that 4,4′-oxydianiline was placed in the four-neck flask instead of 3,3′-diaminodiphenylsulfone, the solid content of the polyamic acid solution by mass ratio was 10% by weight, and the mixing was carried out in a weight ratio of the prepared polyamic acid solution:N,N-imethylacetamide (DMAc):inorganic dispersion:acetone=0.9:2.8:4.1:2.2, in the preparation of the coating composition.

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Abstract

Disclosed herein is a high thermal resistant polyolefin-based separator including a coating layer containing polyamic acid.Specifically, the separator includes a polyolefin-based substrate film, and a coating layer containing polyamic acid formed on one or both surfaces of the polyolefin-based substrate film, wherein the polyamic acid contains one or more functional groups selected from the group consisting of a sulfone group, a trifluoromethyl group, an alkyl group, and a phenyl ether group.Also, disclosed herein is an electrochemical battery having improved thermal stability by using the separator including a coating layer containing polyamic acid.

Description

TECHNICAL FIELD[0001]The present invention relates to a separator including a coating layer, and an electrochemical battery using the same.BACKGROUND ART[0002]A separator for an electrochemical battery refers to an intermediate membrane segregating a cathode and an anode from each other in a battery, while continuously maintaining ion conductivity, thereby allowing battery charging and discharging.[0003]Recently, along with weight lightening and miniaturization trend of an electrochemical battery for high portability of an electronic device, a battery is also required to have high power and large capacity in order to be used for an electric car, and the like. Thus, a separator for a battery is required to be thin and have light weight, and at the same time, to have excellent thermal shape stability for production of a high power battery.[0004]Particularly, in case where a polyolefin-based film is used as a substrate film of the separator, the film may melt down even at relatively lo...

Claims

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Application Information

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IPC IPC(8): H01M2/16H01M10/052H01M50/414H01M50/443H01M50/451H01M50/489
CPCH01M2/1686H01M2220/30H01M10/052C09D179/08C08G73/1039C08G73/1042C08G73/105C08G73/1064C08G73/1067C08G73/1071C08G73/1078C08G73/1082Y02E60/10H01M50/446H01M50/451H01M50/414H01M50/443H01M50/489H01M50/417H01M50/449H01M50/431
Inventor JEON, IN SIKPARK, JIN KYUPARK, TAE JOONCHUNG, JUN HOJIN, MOK YUN
Owner SAMSUNG SDI CO LTD
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