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Separator comprising porous coating and electrochemical device comprising same

A technology of porous coating and separator, which is applied in the field of separators including porous coatings and electrochemical devices including the separators, can solve the problems of difficulty in manufacturing high-capacity batteries, increase in thickness of separators, etc., and achieves improved stability, inhibition of Short-circuit and safety-enhancing effects

Active Publication Date: 2011-12-07
LG NEW ENERGY CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The insulating porous coating formed on the porous substrate helps to improve the stability of the electrochemical device but inevitably causes an increase in the thickness of the separator, making it difficult to fabricate high-capacity batteries

Method used

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  • Separator comprising porous coating and electrochemical device comprising same
  • Separator comprising porous coating and electrochemical device comprising same
  • Separator comprising porous coating and electrochemical device comprising same

Examples

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Embodiment

[0060] Diaphragm production

[0061] To acetone was added polyvinylidene fluoride-co-chlorotrifluoroethylene (PVdF-CTFE) and cyanoethyl pullulan in a weight ratio of 10:2. The binder polymer solution was prepared by dissolving the mixture at 50° C. for at least about 12 hours.

[0062] In addition, polyethylene and carbon black particles (1:1, w / w) were homogenized to prepare conductive PTC particles having an average particle diameter of 400 nm.

[0063] The conductive PTC particles and BaTiO 3 The powders were mixed in a weight ratio of 1:9 to prepare filler particles. The filler particles are dispersed in the binder polymer solution to prepare a slurry. The weight ratio of the filler particles to the binder polymer solution was adjusted to 90:10. The slurry was dip-coated on a 12 μm thick polyethylene terephthalate nonwoven base cloth to form a porous coating. The nonwoven base fabric is composed of microfibers with an average thickness of about 3 μm and has a pore s...

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Abstract

Disclosed is a separator. The separator includes a planar non-woven fabric substrate having a plurality of pores, and a porous coating layer formed on at least one surface of the non-woven fabric substrate. The porous coating layer is composed of a mixture of filler particles and a binder polymer. The filler particles include conductive positive temperature coefficient (PTC) particles composed of a mixture of conductive particles and a low melting point resin having a melting point lower than that of the non-woven fabric substrate. Due to the presence of the conductive PTC particles, the porous coating layer can be imparted with a shutdown function against thermal runaway. In addition, the porous coating layer exhibits appropriate electrical conductivity. Therefore, the separator is suitable for use in a high-capacity electrochemical device.

Description

[0001] Cross References to Related Applications [0002] This application claims priority to Korean Patent Applications No. 10-2008-0136592 and 10-2009-0123873 filed in the Korean Patent Office on December 30, 2008 and December 14, 2009, the contents of which It is incorporated herein by reference in its entirety. technical field [0003] The present invention relates to a separator for an electrochemical device such as a lithium secondary battery, and an electrochemical device including the separator. More specifically, the present invention relates to a separator in which a porous coating layer composed of filler particles and a binder polymer is formed on at least one surface of a nonwoven base fabric, and an electrochemical device including the separator. Background technique [0004] Recently, there has been increasing interest in energy storage technologies. Investments in research and development of electrochemical devices are becoming more concrete as the applicat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16H01M50/417H01M50/42H01M50/426H01M50/429H01M50/454H01M50/457H01M50/491
CPCH01M10/4235H01M2200/106H01M2/162Y02E60/12H01M2/1666H01M2/1686Y02E60/10H01M50/44H01M50/417H01M50/429H01M50/457H01M50/454H01M50/491H01M50/426H01M50/42H01M10/0525H01M50/451H01M50/446H01M50/431H01M50/443H01M50/489
Inventor 朴必圭金钟勋安谆昊金帝映
Owner LG NEW ENERGY CO LTD
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