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Separator, manufacturing method thereof, and electrochemical device employing same

一种隔膜、导电材料的技术，应用在隔膜、其制造和使用该隔膜的电化学器件领域，能够解决电极短路等问题，达到防止短路、优异输出特性、抑制短路的效果

Active Publication Date: 2014-01-01
LG ENERGY SOLUTION LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the conductive material penetrates into the pores of the porous substrate to provide conductivity, thereby possibly causing a short circuit between electrodes

Method used

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  • Separator, manufacturing method thereof, and electrochemical device employing same
  • Separator, manufacturing method thereof, and electrochemical device employing same
  • Separator, manufacturing method thereof, and electrochemical device employing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0113] Example 1: Fabrication of an Inorganic-Organic Coating / Active Material Coating Containing Conductive Material diaphragm

[0114] Polyvinylidene fluoride-chlorinated trifluoroethylene copolymer (PVdF-CTFE) and cyanoethylpullulan (cyanoethylpullulan) were added to acetone at a weight ratio of 10:2 and dissolved at 50 °C for about 12 hours to obtain a polymer solution. Will Al 2 o 3 The powder was added to the polymer solution until the polymer / inorganic particle weight ratio reached 5 / 95, and then the inorganic particles were pulverized and dispersed using a ball mill method for 12 hours to prepare a first slurry.

[0115] Also, to the same polymer solution as above was added LiFePO including a conductive material in an amount of 2%. 4 The powder was powdered until the weight ratio of polymer / inorganic particles reached 10 / 90, and then the inorganic particles were pulverized and dispersed using a ball milling method for 12 hours to prepare a second slurry.

[0116...

Embodiment 2

[0119] Example 2: Fabrication of Active Material Coatings with Inorganic-Organic Coatings / Containing Conductive Materials / Separator with adhesive polymer layer

[0120] The diaphragm was prepared in the same steps as in Example 1, and then the polyvinylidene fluoride-chlorinated trifluoroethylene copolymer (PVdF-CTFE) solution was coated on both surfaces of the diaphragm with a thickness of 3 μm by electrospray method to obtain Separator with electrode-separator adhesive layer.

Embodiment 3

[0121] Example 3: Fabrication of Active Material Coatings with Inorganic-Organic Coatings / Containing Conductive Materials / Separator with adhesive polymer layer

[0122] The procedure of Example 1 was repeated except that the third slurry was not applied to prepare a separator, and then the same electrospray method as in Example 2 was performed to obtain a separator having an electrode-separator adhesive layer.

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Abstract

Disclosed is a separator in which a porous coating layer is formed of a mixture of inorganic material particles and a binder polymer on the surface of a porous substrate.

Description

technical field [0001] The present invention relates to a separator for electrochemical devices such as lithium secondary batteries, a preparation method thereof and an electrochemical device with the separator. More specifically, the present invention relates to a separator in which a porous coating layer comprising a mixture of inorganic particles and a binder polymer is formed on the surface of a porous substrate, and to a method of manufacturing the separator and an electrode provided with the separator. chemical device. [0002] This application claims priority from Korean Patent Application No. 10-2011-0071799 filed in Korea on Jul. 20, 2011, the entire contents of which are incorporated herein by reference. [0003] This application claims priority from Korean Patent Application No. 10-2012-0079209 filed in Korea on Jul. 20, 2012, the entire contents of which are incorporated herein by reference. Background technique [0004] Recently, attention has been paid to ene...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M10/058H01M50/403H01M50/431H01M50/434H01M50/437H01M50/451H01M50/457H01M50/489H01M50/491
CPCH01M4/5825H01M4/625H01M4/485H01M10/0525H01M2/145H01M2/1646H01M4/622H01M4/623H01M2/1686H01M2/1673Y02E60/122H01M2/166H01M50/403H01M50/431H01M50/446H01M50/46H01M50/451H01M50/491H01M50/489H01M50/437H01M50/434H01M50/457Y02P70/50Y02E60/10C08J7/04H01M50/449
Inventor 李柱成金钟勋金阵宇
Owner LG ENERGY SOLUTION LTD
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