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Separator and electrochemical device comprising same

An electrochemical and separator technology, applied in electrochemical generators, hybrid capacitor separators, circuits, etc., can solve the problem of high explosion risk of separators, and achieve the effect of high bonding strength and increasing Lamie strength

Active Publication Date: 2022-02-01
LG ENERGY SOLUTION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among the safety features of electrochemical devices, overheating in electrochemical devices and eventual thermal runaway or puncture of separators pose a high risk of explosion
In particular, polyolefin-based porous polymer substrates commonly used for separators of electrochemical devices exhibit extremely severe damage at temperatures of 100°C or higher due to the nature of the material and the manufacturing process including stretching. Thermal shrinkage behavior, which causes a short circuit between the positive and negative electrodes

Method used

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  • Separator and electrochemical device comprising same
  • Separator and electrochemical device comprising same
  • Separator and electrochemical device comprising same

Examples

Experimental program
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Effect test

Embodiment 1

[0105] P(VDF-TrFE-CTFE) (β-phase content: 0.98) and PVDF-CTFE as a binder polymer were added to an acetone solvent at a weight ratio of 50:50, and dissolved at 50°C for about 4 hours to Prepare the binder polymer solution. In this case, the ratio of solvent to solids (weight of slurry from which solvent was removed) in the binder polymer solution was 19:1.

[0106] Subsequently, the binder polymer solution was dip-coated on both surfaces of a 9 μm-thick polyethylene porous polymer substrate (porosity: 43%, air permeation time: 110 seconds, resistance 0.45Ω), and heated at 23°C and Dry at a relative humidity of 40% to fabricate separators with porous coatings.

Embodiment 2

[0108] P(VDF-TrFE-CTFE) (β-phase content: 0.98) and PVDF-CTFE as a binder polymer were added to an acetone solvent at a weight ratio of 50:50, and dissolved at 50°C for about 4 hours to Prepare the binder polymer solution. Subsequently, alumina (Al 2 o 3 ) (particle size: 500nm) and boehmite (AlOOH) (particle size: 250nm) were mixed at a weight ratio of 9:1, and added to the binder polymer solution so that the weight of the binder polymer and inorganic particles The ratio is 20:80. 2 parts by weight of a dispersant based on 100 parts by weight of the inorganic particles were added, and the inorganic particles were pulverized and dispersed for 12 hours using a ball milling method to prepare a porous coating layer forming slurry. In this case, the ratio of solvent to solid was controlled at 4:1.

[0109] The porous coating-forming slurry was dip-coated on both surfaces of a 9 μm-thick polyethylene porous polymer substrate (porosity: 43%, air permeation time: 110 seconds, res...

Embodiment 3 to Embodiment 4

[0111] Separators were produced in the same manner as in Example 2, except that the amounts of P(VDF-TrFE-CTFE) and PVDF-CTFE were adjusted as shown in Table 1.

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Abstract

One aspect of the present invention provides a separator comprising a porous polymer substrate and a porous coating layer, with the porous coating layer including P(VDF-TrFE-CTFE) and PVDF-CTFE as binder polymers. By changing the characteristics of binder polymers by means of aforesaid feature, it is possible to provide a separator having a lower resistance and an electrochemical device comprising same.

Description

technical field [0001] The present disclosure relates to a separator for an electrochemical device, such as a lithium secondary battery, and an electrochemical device including the separator. [0002] This application claims priority from Korean Patent Application No. 10-2019-0070943 filed in Korea on June 14, 2019, the disclosure of which is incorporated herein by reference. Background technique [0003] Recently, there has been increasing interest in energy storage technologies. As the field of application of energy storage technology has expanded to mobile phones, camcorders, notebook computers, and even electric vehicles, efforts have been devoted to research and development of 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 e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M50/417H01G11/52H01M10/052
CPCH01M10/052H01M50/417H01G11/52H01G9/02H01M50/449H01M50/446H01M50/426Y02E60/10H01M50/451H01M50/491H01M50/489H01M50/431H01M50/443H01M50/461H01M10/0525
Inventor 郑邵美成东昱
Owner LG ENERGY SOLUTION LTD