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Method for manufacturing separator for electrochemical device

An electrochemical and separator technology, applied in electrochemical generators, separators/films/diaphragms/spacers, circuits, etc., can solve the problem of failing to meet the safety requirements of electrochemical devices, and improve heat resistance. and the effect of low resistance

Active Publication Date: 2021-01-26
LG ENERGY SOLUTION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since the polyvinylidene fluoride-based binder polymer has a low melting point of 130° C. to 150° C., it cannot satisfy safety requirements in the latest trend of electrochemical devices toward larger dimensions and higher capacities. sexual demands

Method used

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  • Method for manufacturing separator for electrochemical device
  • Method for manufacturing separator for electrochemical device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0166] First, a polyvinylpyrrolidone adhesive polymer having a weight average molecular weight of 2,500,000 and a k value of 120 was added to isopropyl alcohol as a first organic solvent, and dissolved at 50°C for about 4 hours to prepare a first adhesive agent composition.

[0167] Subsequently, cyanoethyl polyvinyl alcohol as a dispersant, and polyvinylidene fluoride-co-hexafluoropropylene and polyvinylidene fluoride-co-trifluoro Vinyl chloride was added to acetone as a second organic solvent, and dissolved at 50° C. for about 4 hours to prepare a second adhesive composition.

[0168] Subsequently, the first adhesive composition and the second adhesive composition are mixed together, and aluminum oxide (Al 2 o 3 ) inorganic particles (Alteo, P172LSB, particle size: 500nm) and boehmite inorganic particles were added to the mixture at a ratio of 85:15, and the inorganic particles were pulverized and dispersed for 2 hours using a bead milling method to prepare a porous coatin...

Embodiment 2 to 5

[0171] A separator was manufactured by the same method as in Example 1 except that the composition of the porous coating layer forming slurry was controlled as shown in Table 1.

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Abstract

One aspect of the present invention provides a separator and a manufacturing method therefor, the separator having a Lami strength equal to or similar to that of a conventional separator according tothe use of a polyvinylpyrrolidone binder polymer in a predetermined amount, compared with a polyvinlylidenefluoride-based binder polymer and, simultaneously, having improved heat resistance and reduced resistance.

Description

technical field [0001] The present disclosure relates to a method of manufacturing a separator for an electrochemical device such as a lithium secondary battery. [0002] This application claims priority from Korean Patent Application No. 10-2019-0033748 filed in Korea on March 25, 2019, the disclosure of which is incorporated herein by reference. Background technique [0003] Recently, interest in energy storage technologies has increased. As the field of application of energy storage technology has expanded to mobile phones, camcorders, notebook computers, and even electric vehicles, efforts have been made to research and develop electrochemical devices. In this regard, electrochemical devices have received increasing attention, especially the development of rechargeable secondary batteries is the focus of attention, and recently, in the development of batteries, methods for increasing capacity density and Specific new electrode and cell designs. [0004] Among the curr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M50/403H01M50/417H01M50/426H01M50/449H01M10/052H01M50/409H01M50/443
CPCH01M10/052Y02E60/10H01M50/403H01M50/449H01M50/446H01M50/443H01M50/431H01M50/417H01M50/409H01M50/491H01M50/426Y02P70/50H01M10/0525
Inventor 权慧珍尹秀珍金明洙李济安
Owner LG ENERGY SOLUTION LTD