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Separator including coating layer of inorganic and organic mixture, and battery including the same

A coating and battery technology, applied in coatings, lithium batteries, transportation and packaging, etc., can solve the problems of poor electrode adhesion, difficulty in achieving other effects, difficulty in ensuring electrode and separator adhesion, etc., and achieve good Thermal stability, good adhesion effect

Active Publication Date: 2013-09-11
CHEIL IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Although this method can provide improved thermal stability by coating inorganic particles on the separator, the single application of polyvinylidene fluoride-hexafluoropropylene copolymer as an organic polymer to form the coating makes it possible to eliminate inorganic additives. In addition to smooth coating, it is difficult to achieve other effects
[0007] That is, as the battery capacity increases, it is difficult for the conventional technology to ensure the desired adhesion between the electrodes and the separator, and there is an ever-increasing possibility that the adhesion to the electrodes gradually deteriorates due to inorganic particles on the surface of the separator

Method used

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  • Separator including coating layer of inorganic and organic mixture, and battery including the same

Examples

Experimental program
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Embodiment 1 to 5 and comparative example 1 to 4

[0080] Preparation of polyolefin porous separators comprising coatings of organic and inorganic mixtures

Embodiment 1

[0082] (1) Preparation of coating composition

[0083] 1) A polyvinylidene fluoride-hexafluoropropylene ('PVdF-HFP') copolymer (Solvay) having a weight-average molecular weight of 700,000 g / mol was added to acetone (Daejung Chemicals & Metals) in an amount of 10 wt %, and then at 25 °C for 4 hours with a stirrer to prepare a first polymer solution.

[0084] 2) Polyvinylidene fluoride ('PVdF') homopolymer (Sovay) having a weight-average molecular weight of 1,100,000 g / mol was added to DMF (Daejung Chemicals & Metals) in an amount of 10 wt%, followed by stirring at 25°C The mixture was stirred for 4 hours to prepare a second polymer solution.

[0085] 3) Alumina particles (Nippon Light Metal Company, Ltd.) were added to acetone (Daejung Chemicals & Metals) in an amount of 25 wt %, followed by milling with a ball mill at 25° C. for 3 hours for dispersion, thereby preparing an inorganic dispersant.

[0086] The first polymer solution prepared by mixing the first polymer solution...

Embodiment 2

[0090] A separator was prepared in the same manner as in Example 1, except by mixing the first polymer solution, the second polymer solution, the inorganic dispersant, and the solvent at a ratio of 0.7:0.3:3:6 in (1) of Example 1 ( acetone) to prepare the coating composition.

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Abstract

The invention discloses a separator including a coating layer of an inorganic and organic mixture, and a battery including the same. The separator includes a coating layer of an organic and inorganic mixture and exhibits good heat resistance and good adhesion to electrodes. Specifically, the porous separator is coated with an organic and inorganic mixture containing a polyvinylidene fluoride homopolymer and a polyvinylidene fluoride-hexafluoropropylene copolymer as an organic binder system, and inorganic particles, exhibits good adhesion and thermal stability, prevents short circuit between the positive electrode and the negative electrode, and provides improved stability to electrochemical batteries.

Description

technical field [0001] The present invention relates to separators comprising coatings of organic and inorganic mixtures, and batteries comprising the same. Background technique [0002] A separator for an electrochemical cell refers to an intermediate layer disposed inside a battery to isolate a positive electrode and a negative electrode from each other while maintaining ion conductivity allowing charging and discharging of the battery. [0003] Recently, electrochemical cells having a lighter and thinner structure have been developed to improve the portability of electronic devices such as mobile devices and notebook computers while ensuring high output and high capacity for electric vehicles and the like. Therefore, in order to produce high-capacity batteries, separators for batteries are required to have a slim thickness and light weight while ensuring high adhesion and shape stability based on high heat resistance. [0004] Therefore, various studies have also been co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M50/417H01M50/426H01M50/451H01M50/457
CPCH01M10/052Y02E60/10H01M50/446H01M50/417H01M50/451H01M50/457H01M50/426C08J7/04H01M50/491H01M50/449H01M50/489H01M50/414H01M50/431H01M50/463H01M2220/20Y02T10/70
Inventor 洪起哲朴明国都在九鄭準鎬
Owner CHEIL IND INC
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