Separator having excellent thermal conductivity and electrochemical device using same

A diaphragm and oxide film technology, applied in the field of electrochemical devices, can solve problems such as the limitation of fire possibility, achieve excellent heat dissipation characteristics, improve thermal shrinkage rate, and uniform temperature difference.

Pending Publication Date: 2022-07-08
SK INNOVATION CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, in the case of such a separator with a ceramic layer, as the capacity increases, the internal temperature of the battery will still rise during use. restricted

Method used

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  • Separator having excellent thermal conductivity and electrochemical device using same
  • Separator having excellent thermal conductivity and electrochemical device using same
  • Separator having excellent thermal conductivity and electrochemical device using same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0106]

[0107] An aqueous dispersion of 30 wt % of solid content of core-shell silicon particles having a solid content of 30 wt % dissolved and dispersed with 4 wt % of water-soluble polyvinyl alcohol and 96 wt % of core-shell silicon particles having an average particle diameter of 1 μm and an oxide film shell layer of 10 nm was prepared. The aqueous dispersion was ball milled for 3 minutes to prepare an aqueous dispersion slurry. The prepared slurry was coated on both sides of a 11 μm polyethylene separator (51% porosity) by slot extrusion coating and dried sufficiently, each side was 2.6 μm in terms of the thickness of the active layer , with a total thickness of 5.2 μm. The physical properties, thermal shrinkage rate, thermal conductivity and moisture content of the coatings of the produced separators were measured and reported in Table 1.

[0108] In addition, as a result of evaluating the heat dissipation performance, in the case of Example 1 ( figure 1 ), the resu...

Embodiment 2

[0119] The same method was carried out except that 0.5 μm core-shell silicon particles were used in Example 1, and the results are shown in Table 1.

Embodiment 3

[0121] The same method was carried out except that 50% by weight of 1.0 μm core-shell silicon particles and 50% by weight of 0.7 μm boehmite particles were used in Example 1 instead of 1.0 μm core-shell silicon particles, and the The results are shown in Table 1.

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Abstract

The present invention relates to a secondary battery separator having excellent heat dissipation characteristics and thermal stability compared to a conventional polyolefin-based separator, and an electrochemical device including the same to ensure safety while improving performance.

Description

technical field [0001] The present invention relates to a separator with excellent thermal conductivity and an electrochemical device using the separator. More specifically, the present invention relates to a separator having superior thermal conductivity characteristics compared to existing polyolefin-based separators. Background technique [0002] In recent years, in order to apply to automobiles and the like, secondary batteries have been increased in capacity and in size. As the battery is used, the internal temperature of the battery increases, and it heats the solvent of the electrolyte, causing problems such as expansion or fire due to explosion, thus posing a serious threat to the safety of the battery. [0003] In order to ensure this safety, a ceramic layer formed of inorganic particles or inorganic particles and organic particles is introduced on a porous sheet such as polyolefin, thereby ensuring the safety of the battery and commercializing it to solve the coer...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M50/40H01M50/403H01M50/457
CPCH01M50/40H01M50/457H01M50/403H01M50/449H01M50/434H01M50/443H01M50/446H01M50/417H01M50/414H01M10/052H01M50/431Y02E60/10H01M50/491
Inventor 池尚胤
Owner SK INNOVATION CO LTD
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