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Secondary battery separator comprising dispersant, and manufacturing method therefor

A technology for secondary batteries and dispersants, which is applied to lithium batteries, battery pack parts, non-aqueous electrolyte batteries, etc., can solve the problems of not publicly improving adhesion, and not proposing clear solutions.

Pending Publication Date: 2021-01-29
LG ENERGY SOLUTION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0013] Patent Document 3 is characterized by having a self-extinguishing function by forming a flame-retardant coating including flame-retardant particles, but does not disclose a technique for improving adhesion
[0014] There is a need for improved technology capable of ensuring adhesion to electrodes while exhibiting uniform physical properties by improving dispersion of inorganic materials used to form coatings of separators with improved safety, but has not yet been developed. come up with clear solutions

Method used

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  • Secondary battery separator comprising dispersant, and manufacturing method therefor
  • Secondary battery separator comprising dispersant, and manufacturing method therefor
  • Secondary battery separator comprising dispersant, and manufacturing method therefor

Examples

Experimental program
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Effect test

Embodiment 1

[0085] A mixed solvent including 68% by weight of acetone and 12% by weight of isopropyl alcohol (IPA) was prepared. Then, 16% by weight of aluminum hydroxide (Al(OH) 3 ) and 0.3% by weight of tannic acid as a dispersant were introduced into the mixed solvent, followed by mixing for 30 minutes to prepare a primary slurry.

[0086] 3.7% by weight of polyvinylidene fluoride (PVDF) as a binder was added to the primary slurry, and then the inorganic material was pulverized and dispersed for 1 hour by using a ball mill to prepare a secondary slurry.

[0087] The secondary slurry was coated to a thickness of 4 μm on both surfaces of a porous separator substrate of polyolefin-based material with a thickness of 9 μm, and gaseous water vapor was introduced into a steam box and dried at 25 °C for 10 min to fabricate clapboard.

Embodiment 2

[0089] Separators were manufactured using the same method as in Example 1, except that the amount of tannic acid was changed from 0.3% by weight to 0.1% by weight, and the amount of polyvinylidene fluoride was changed from 3.7% by weight to 3.9% by weight %.

Embodiment 3

[0095] Separators were fabricated using the same method as in Example 1, except that the amount of tannic acid was changed from 0.3% by weight to 0.2% by weight; the amount of polyvinylidene fluoride was changed from 3.7% by weight to 3.8% by weight ; the amount of acetone was changed from 68% by weight to 76% by weight; and the amount of isopropanol was changed from 12% by weight to 4% by weight.

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Abstract

The present invention relates to a secondary battery separator comprising a porous separator substrate made of a polyolefin-based material, and a coating layer coated on at least one surface of the separator substrate, wherein the coating layer is a dried form of a slurry comprising a binder, an inorganic material, a mixed solvent comprising two or more types of solvents, and a dispersant, the inorganic material is a metal hydroxide, the dispersant is a compound containing 10-30 hydroxyl groups in one molecule, a uniform coating layer is formed, and adhesiveness is improved.

Description

technical field [0001] This application claims the benefit of priority of Korean Patent Application No. 2019-0054480 filed on May 9, 2019, the disclosure of which is hereby incorporated by reference in its entirety. [0002] The present invention relates to a separator for a secondary battery including a dispersant and a manufacturing method thereof, and particularly to a separator for a secondary battery including a dispersant and a manufacturing method thereof, the separator being The adhesive concentrates on the surface of the separator coating for improved adhesion. Background technique [0003] Since lithium secondary batteries have high output compared with conventional secondary batteries, there is great interest in ensuring the stability of lithium secondary batteries. In order to improve the safety of the separator, a Safety Reinforced Separator (hereinafter referred to as "SRS separator") has been developed and used. The SRS separator is configured to have a stru...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M50/417H01M50/431H01M50/451H01M50/403H01M10/052C08J9/36C09D7/61C09D7/45C09D7/20C09D201/00H01M50/443H01M50/489
CPCH01M50/451H01M50/417H01M50/431H01M50/403H01M10/052C08J9/36C09D7/61C09D7/45C09D7/20C09D201/00Y02E60/10C09D5/024C08K3/22H01M50/446H01M50/429H01M50/449H01M50/434H01M50/443H01M50/489C08J9/365H01M50/411H01M50/491Y02P70/50C08J2323/02C09D127/16
Inventor 金明洙尹秀珍
Owner LG ENERGY SOLUTION LTD
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