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Porous multi-layer film with improved thermal properties

A multi-layer film and porous film technology, applied in the direction of layered products, household appliances, other household appliances, etc.

Active Publication Date: 2012-10-17
SK INNOVATION CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the above prior art cannot have these characteristics at the same time

Method used

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  • Porous multi-layer film with improved thermal properties
  • Porous multi-layer film with improved thermal properties
  • Porous multi-layer film with improved thermal properties

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0127] In the first layer, use 3.0×10 5 Polyethylene with a weight-average molecular weight and a melting temperature of 134°C and a paraffin oil with a dynamic viscosity of 95cSt at 40°C. The weight percentages of these two components are 30% and 70% respectively. In the second layer, polymethylpentene with a melting index of 9.0 (260°C, 5Kg) and a volume percentage of 50% is used as a high heat-resistant resin, and it has a 5.7×10 5 Polypropylene with a weight-average molecular weight and a melting temperature of 163°C and a volume percentage of 50% is used as another resin separated from the liquid-liquid state of the high heat-resistant resin. CaCO with an average particle size of 1.5μm and a weight percentage of 50% 3 Used as an inorganic material.

[0128] After co-extrusion of the first layer formed on both surfaces of the three layers, the sheet was stretched 8 times at 115°C in the longitudinal direction (MD) and 120°C in the transverse direction (TD) The bottom is stre...

Embodiment 2

[0130] In the first layer, use 3.0×10 5 Polyethylene with a weight-average molecular weight and a melting temperature of 134°C and a paraffin oil with a dynamic viscosity of 95cSt at 40°C. The weight percentages of these two components are 30% and 70% respectively. In the second layer, polymethylpentene with a melting index of 9.0 (260°C, 5Kg) and a volume percentage of 50% is used as a high heat-resistant resin, and a 2.5×10 5 Polypropylene with a weight-average molecular weight and a melting temperature of 148°C and a volume percentage of 50% is used as another resin separated from the liquid-liquid state of the high heat-resistant resin. CaCO with an average particle size of 1.5μm and a weight percentage of 30% 3 Used as an inorganic material.

[0131] After co-extrusion of the first layer formed on both surfaces of the three layers, the sheet was stretched 7 times at 115°C in the longitudinal direction (MD) and at 120°C in the transverse direction (TD) The bottom is stretche...

Embodiment 3

[0133] In the first layer, use 3.0×10 5 Polyethylene with a weight-average molecular weight and a melting temperature of 134°C and a paraffin oil with a dynamic viscosity of 95cSt at 40°C. The weight percentages of these two components are 30% and 70% respectively. In the second layer, polymethylpentene with a melting index of 9.0 (260°C, 5Kg) and a volume percentage of 70% is used as a high heat-resistant resin, and a 2.3×10 5 Polyethylene with a weight-average molecular weight and a melting temperature of 133°C and a volume percentage of 30% is used as another resin separated from the liquid-liquid state of the high heat-resistant resin.

[0134] After co-extrusion of the first layer formed on both surfaces of the three layers, the sheet was stretched 8 times at 115°C in the longitudinal direction (MD) and 120°C in the transverse direction (TD) The bottom is stretched 5 times. The diluent was extracted with dichloromethane by liquid immersion method, and the extraction time wa...

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Abstract

Provided is a porous multi-layer film having two or more layers that is used as a separator for battery. In the film, more than 2 layers have different porosities and pore sizes. The film has a thickness of 9 to 50?, a machine direction (MD) loop stiffness of 0.008mg / ? or more, puncture strength of 0.15N / ? or more, permeability of 1.5 x 10-5Darcy or more, shut-down temperature of 140? or less, melt-down temperature of 170? or more, a transverse direction (TD) maximum shrinkage of 25% or less in Thermomechanical Analysis (TMA) under a load of 1mN / (1? x 6mm), and melt down temperature of 160? or more. Since the porous multi-layer film shows excellent thermal stability at high temperature and electrolyte retaining property due to a dual pore structure, the film shows a superior effect when used as a separator for high-capacity / high-power lithium ion battery.

Description

Technical field [0001] The present invention relates to a porous multilayer film with improved thermal characteristics. More specifically, the present invention relates to a porous multilayer film with excellent thermal stability, electrolyte retention, and battery assembly stability when used as a separator for lithium secondary batteries. Multilayer film, because the film is formed of two or more layers and has the characteristics of micropores, low shut-off temperature, and high melting temperature. Background technique [0002] Although the lithium ion secondary battery is an excellent battery with a very high energy density, it has a risk of explosion when short-circuited, and therefore the separator used therein is largely required to have quality stability and a high quality level. According to the current trend of high capacity and high power of lithium ion secondary batteries, such as batteries used in hybrid vehicles, etc., in addition to the quality stability of tradit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M2/18H01M10/02C08J5/22B32B7/02H01M50/417H01M50/426H01M50/434H01M50/451H01M50/457H01M50/489H01M50/491
CPCH01M2/1686B32B2307/306B32B27/08H01M2/162B32B2457/10B32B3/266B32B7/02B32B27/304B32B2270/00B32B2250/24B32B2307/20H01M10/052B32B27/32H01M2/1613B32B27/18B32B27/302B32B27/306B32B27/34B32B27/36B32B27/365B32B2264/10B32B2264/102B32B2264/104B32B2307/30B32B2307/308B32B2307/518B32B2307/581B32B2307/726B32B2307/732B32B2307/736Y10T428/24942Y02E60/10H01M50/44H01M50/417H01M50/451H01M50/457H01M50/491H01M50/434H01M50/489H01M50/426H01M50/463H01M50/414H01M50/446H01M50/431H01M50/42C08J5/2206
Inventor 李章源姜贵权郑仁和李荣根
Owner SK INNOVATION CO LTD
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