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Method for manufacturing separator, separator manufactured by the method and method for manufacturing electrochemical device including the separator

一种隔板、设备的技术，应用在电化学发生器、最终产品制造、可持续制造/加工等方向，能够解决粘合性降低、电极粘合性降低、减少等问题，达到增强粘合性、高粘合强度、提高稳定性的效果

Active Publication Date: 2012-10-24
LG ENERGY SOLUTION LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as the content of the inorganic particles increases, the content of the binder polymer decreases relatively, so the adhesion of the electrode decreases, and when stress or contact occurs during the fabrication of the electrochemical device (e.g., winding) May cause separation of inorganic particles from porous coatings when reaching external components
If the adhesion between the separator and the electrode is reduced, it will lead to the degradation of the performance of the electrochemical device, and the separated inorganic particles will act as a local defect of the electrochemical device, which will adversely affect the safety of the electrochemical device

Method used

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  • Method for manufacturing separator, separator manufactured by the method and method for manufacturing electrochemical device including the separator

Examples

Experimental program
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Effect test

Embodiment 1

[0058] cyanoethylpullulan as the first binder polymer and polyvinylidene fluoride-co-hexafluoropropylene (PVdF-HFP) as the second binder polymer with a weight ratio of 2:10 ) polymer mixture was dissolved in acetone at 50 °C for at least about 12 h to prepare a polymer solution. Add barium titanate (BaTiO 3 ) powder until the weight ratio of polymer mixture to inorganic powder reaches 10:90. After at least 12 hours, the inorganic particles were pulverized and dispersed using a ball mill to prepare a slurry. The inorganic particles of the slurry prepared in this way had an average particle diameter of 600 nm.

[0059] In addition, distilled water was used as a non-solvent for the second binder polymer.

[0060] Pass the slurry and non-solvent prepared in this way through figure 1 The slot die shown in was continuously coated onto one side of a 12 μm thick porous polyethylene terephthalate film (45% porosity). The wet thicknesses of the slurry and non-solvent were adjusted ...

Embodiment 2

[0065] A separator was fabricated in the same manner as in Example 1, except that the kind of non-solvent was changed to a mixture of distilled water and methanol (5:5 (v / v)). The obtained separator was found to have a Gurley value of 367.6 sec / 100 mL and an adhesive strength of 9.81 gf / cm.

Embodiment 3

[0067] A separator was manufactured in the same manner as in Example 1 except that the kind of the first adhesive polymer was changed to cyanoacrylate. The obtained separator was found to have a Gurley value of 375.4 sec / 100 mL and an adhesive strength of 13.94 gf / cm.

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Abstract

Disclosed is a method for manufacturing a separator. The method includes (S1) preparing a porous planar substrate having a plurality of pores, (S2) preparing a slurry containing inorganic particles dispersed therein and a polymer solution including a first binder polymer and a second binder polymer in a solvent, and sequentially coating the slurry on the porous substrate through a first discharge hole and a non-solvent incapable of dissolving the second binder polymer on the slurry through a second discharge hole adjacent to the first discharge hole, and (S3) simultaneously removing the solvent and the non-solvent by drying. According to the method, a separator with good bindability to electrodes can be manufactured in an easy manner. In addition, problems associated with the separation of inorganic particles in the course of manufacturing an electrochemical device can be avoided.

Description

technical field [0001] This application claims priority to Korean Patent Applications No. 10-2010-0016989 and No. 10-2011-0016506 filed in Korea on February 25, 2010 and February 24, 2011, respectively, the entire The contents are incorporated herein by reference. [0002] The present invention relates to a method of manufacturing a separator for an electrochemical device such as a lithium secondary battery, a separator manufactured by the method, and a method for manufacturing an electrochemical device including the separator. More specifically, the present invention relates to a method for manufacturing a separator in which an organic-inorganic composite porous layer consisting of a mixture of inorganic particles and a binder polymer is formed on a porous substrate; manufactured by this method separator; and a method for making an electrochemical device comprising the separator. Background technique [0003] Recently, there has been an increasing interest in energy stora...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M50/403H01M50/417H01M50/42H01M50/423H01M50/426H01M50/429H01M50/434H01M50/451H01M50/489
CPCY02E60/12H01M2/1686H01M10/0525H01M2/1646H01M10/052H01M2/1653H01M2/145H01M2/162H01M2/166Y10T156/10Y02E60/10H01M50/411H01M50/44H01M50/431H01M50/446H01M50/403H01M50/449Y02P70/50H01M10/02C08J7/04B05C1/0813B05C1/0826B05D1/28H01M50/426H01M50/42H01M50/429H01M50/417H01M50/423H01M50/451H01M50/434H01M50/443H01M50/491H01M50/489
Inventor 李柱成洪章赫金钟勋柳宝炅
Owner LG ENERGY SOLUTION LTD
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