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Method for manufacturing separator and electro-chemical device equipped with separator manufactured thereby

一种制造方法、隔膜的技术，应用在最终产品制造、二次电池制造、可持续制造/加工等方向，达到防止电池性能的劣化、抑制损失、小化孔堵塞的效果

Active Publication Date: 2014-05-21
LG ENERGY SOLUTION LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But in this regard, a separator that effectively forms an adhesive layer on a porous substrate layer has not been developed so far, and the development of such a separator is urgent

Method used

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  • Method for manufacturing separator and electro-chemical device equipped with separator manufactured thereby
  • Method for manufacturing separator and electro-chemical device equipped with separator manufactured thereby
  • Method for manufacturing separator and electro-chemical device equipped with separator manufactured thereby

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0091] Polyvinylidene fluoride-co-hexafluoropropylene (PVdF-HFP) copolymer was added as a polymer in an amount of 5% by weight to acetone, and dissolved at 50°C for about 12 hours or more to prepare an adhesive agent polymer solution. Will Al 2 o 3 The powder was added to the prepared binder polymer solution so that the binder polymer and Al 2 o 3 The weight ratio of the powder is 10:90, and the Al 2 o 3 The powder was pulverized by a ball mill and dispersed for 12 hours or more to prepare a slurry. Al present in the slurry thus prepared 2 o 3 The particle size is about 400nm. The slurry was coated on a porous polyethylene film having a thickness of 12 μm and a porosity of 45% by dip coating, and the coating thickness was controlled to a thickness of about 20 μm.

[0092] The pore diameter and porosity of the porous coating layer formed on the porous polyethylene film were measured by a porosimeter. As a result, the pore diameter and porosity of the porous coating lay...

Embodiment 2

[0100] The procedure of Example 1 was repeated except that a binder solution obtained by dissolving 10 parts by weight of polyvinylpyrrolidone (Aldrich, Mw: 55,000) in 100 parts by weight of water was used to prepare a separator.

[0101] In the separator, the contact angle of the binder solution with the porous coating was maintained at 85° for 30 seconds.

Embodiment 3

[0103] The procedure of Example 1 was repeated except that a binder solution obtained by dissolving 10 parts by weight of polyethylene glycol (Aldrich, Mw: 8,000) in 100 parts by weight of water was used to prepare a separator.

[0104] In the separator, the contact angle of the binder solution with the surface of the porous coating was maintained at 93° for 30 seconds.

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Abstract

The present invention relates to a method for manufacturing a separator, comprising the following steps: (S1) preparing a planar porous substance having a plurality of pores; (S2) forming a porous coating layer by applying a coating solution in which inorganic particles are scattered and a binder polymer is dissolved in a solvent, onto the porous substance, and drying the porous coating layer; and (S3) forming an adhesive layer by introducing a binder solution to a surface of the dried porous coating layer, wherein the surface energy of the binder solution is larger by as much as 10mN / m when compared to the surface energy of the porous coating layer, and a contact angle of the binder solution with respect to the surface of the porous coating layer is maintained at 80 degrees or more for 30 seconds. The method according to the present invention can easily manufacture the separator capable of minimizing the amount of adhesive to be used for bonding an electrode, ensuring sufficient bonding force to the electrode using a small amount of adhesive, and minimizing the deterioration of battery performance.

Description

technical field [0001] The present invention relates to a method for manufacturing a separator of an electrochemical device such as a lithium secondary battery, a separator manufactured by the method, and an electrochemical device including the separator. Specifically, the present invention relates to a method for manufacturing a separator characterized in that an adhesive layer is formed by applying an adhesive solution having a surface energy 10 mN / m higher than that of a porous coating layer In the above, the contact angle between the binder solution and the surface of the porous coating is maintained at 80° or more for 30 seconds, and it also relates to a separator manufactured by the method and an electrochemical device including the separator. [0002] This application claims the benefit of Korean Patent Application No. 10-2011-0143759 filed in Korea on December 27, 2011 and Korean Patent Application No. 10-2012-0150587 filed in Korea on December 21, 2012, all of which ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M10/04C08J7/04H01M10/052H01M50/403H01M50/414H01M50/417H01M50/434H01M50/449
CPCH01M50/403H01M50/446H01M50/461H01M50/449H01M50/414H01M50/417H01M50/434Y02E60/10Y02P70/50H01M50/491H01M50/489H01M50/443H01M50/431H01M10/052
Inventor 河廷玟李柱成金阵宇金钟勋陈善美柳宝炅
Owner LG ENERGY SOLUTION LTD
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