Sk Innovation Co., Ltd.

Sk Energy Co., Ltd.

Sk Ie Technology Co., Ltd.

Jang-weon Rhee

Gwigwon Kang

Inhwa Jung

Young-Keun Lee

Young Keun Lee

Young-keun Lee

Youngkeun Lee

Yongkyoung Kim

Gwi-Gwon Kang

Jae Woong Kim

Je-An Lee

Dong Jin Joo

In Hwa Jung

Byoung-Cheon Jo

Yong Kyoung Kim

Young Jun Woo

Jung-Moon Sung

In-Hwa Jung

Hyungmin Kim

Gwi Gwon Kang

Jungmoon Sung

Gwig Won Kang

Youngjun Woo

Chol-Ho Lee

Dongjin Joo

In-hwa Jung

Sangbae Cheong

Jaewoong Kim

Provided is a manufacturing method of a polyolefin-based multilayer composite porous film, including: a) forming a composition including a polyolefin resin and diluent to a sheet; b) stretching the sheet and extracting the diluent to manufacture a film; c) performing heat-treatment on the manufactured film; and d) coating one surface or both surfaces of the heat-treated film with a coating solution containing a heat resistant resin, wherein step c) and step d) are continuously performed.

Manufacturing method of porous multilayered polyolefin

The following disclosure relates to a microporous polyolefin composite film having excellent heat resistance and thermal stability, and a method for manufacturing the same. More particularly, the present invention relates to a microporous polyolefin composite film capable of improving stability and reliability of a battery by heat sealing an edge of a microporous film provided with a coating layer that includes a polymer binder and inorganic particles, and a method for manufacturing the same.

Microporous polyolefin composite film having excellent heat resistance and thermal stability and method for manufacturing the same

Provided is a micro-porous polyolefin composite film, the micro-porous polyolefin composite film including a porous coating layer containing a polymer binder and inorganic particles, the polymer binder simultaneously employing an aqueous polymer and a non-aqueous polymer. The contents of the aqueous polymer and the non-aqueous polymer are controlled, and thus optimize heat resistance, adhesive strength, and the moisture content to thereby improve high-temperature stability, and, further, improve the adhesive strength to thereby improve stability in production, and minimize the moisture content to thereby improve reliability of a battery.

Micro-porous polyolefin composite film having excellent heat resistance and stability and method for producing the same

The present invention relates to a multi-layered microporous polyolefin film for a battery separator and a method for preparing the same. The microporous multi-layered film of the present invention has a characteristics to have both the low shutdown temperature conferred by the polyethylene and the high melt fracture temperature conferred by the polypropylene and heat-resistant filler. In addition, it has the high strength and stability conferred by the micropores prepared under wet process and the high permeability and high strength conferred by the macropores prepared under dry process. Therefore, this multi-layered film can be used effectively to manufacture a secondary battery with high capacity and high power.

Microporous polyolefin multi layer film and preparing method thereof

Provided is a method of manufacturing a microporous polyolefin film useable as a battery separator, which is easy to control strength, permeability and shrinking properties of the microporous film and embodies excellent quality uniformity and production stability in fabricating the microporous film.

Method for preparing microporous polyolefin film with improved productivity and easy control of physical properties

A microporous polyolefin multilayer film which is used as a separator for a battery is a 3 layer microporous film which is prepared by a wet process to have both surface layers containing polyethylene of 95 wt % or more having a melting temperature of 125&#xb0; C. or higher, and an inner layer containing polypropylene of 50 to 90 wt % having a melting temperature of 160&#xb0; C. or higher and polyethylene of 10 to 50 wt % having a melting temperature of 125&#xb0; C. or higher. A thickness of the film is 9-50/M, a puncture strength is 0.15N//M or more, a permeability is 1.5&#xd7;10Darcy or more, a multiplication of the puncture strength and the permeability is 0.4&#xd7;10Darcy&#xb7;N/&#x3bc;m or more, a shrinkage in a transverse direction at 120&#xb0; C. for 1 hour is 15% or less, and a melt fracture temperature of 160&#xb0; C. or higher.

Microporous polyolefin multi layer film

The present invention relates to a microporous polyethylene film for use as battery separator. The microporous polyethylene film according to the present invention is characterized by having a film thickness of 5-40 &#x3bc;m, a porosity of 35-55%, a permeability from 2.5&#xd7;10to 10.0 10Darcy, a puncture strength of at least 0.10 N/&#x3bc;m at 90&#xb0; C., a puncture angle of at least 30&#xb0; at 90&#xb0; C., and a permeability from 2.0 10to 8.0 10Darcy after shrinking freely at 120&#xb0; C. for 1 hour. The microporous polyethylene film in accordance with the present invention has very superior puncture strength and thermal stability at high temperature and takes place of less decrease of permeability due to low thermal shrinkage at high temperature, as well as superior permeability. Therefore, it can be usefully applied in a high-capacity, high-power battery to improve thermal stability and long-term stability of the battery.

Microporous polyethylene film with good property of strength and permeability at high temperature

Disclosed in the present invention are a microporous polyethylene film and a method of manufacture thereof. The polyethylene microporous film manufactured according to the present invention may contribute to an increased productivity of stable products as its extrusion and stretching may be done readily. And thus manufactured product may be used for battery separators and various filters owing to its high gas permeability, superior puncture strength, and small ratio of shrinkage.

Microporous polyethylene film manufactured according to liquid-liquid phase separation and method of producing the same

The present invention discloses a microporous high-density polyethylene film for a battery separator, and process for preparing the same. The microporous high-density polyethylene film according to the present invention comprises of high-density polyethylene with weight average molecular weight of 2&#xd7;10&#x2dc;4&#xd7;10, containing not more than 5 wt % of molecules with molecular weight of 1&#xd7;10or less and not more than 5 wt % of molecules with molecular weight of 1&#xd7;10or more, and has the properties of puncture strength of 0.22 N/&#x3bc;m or more, Darcy's permeability constant of 1.8&#xd7;10Darcy or more, and shrinkage of 4% or less in machine and transverse direction, respectively. Particularly, the microporous high-density polyethylene film has excellent extrusion-compoundability and stretchability with high productivity and enhances performances and stability of the battery using the film.

Preparing method of microporous high density polyethylene film

The present invention is related to microporous polyolefin films that may be used for battery separators and the methods of manufacturing the same. These microporous polyolefin films are characterized by being manufactured in a method comprising the steps of melt-extruding a composition, comprised of 20-50 weight % of a resin composition, comprised of 90-98 weight % of polyethylene (Component I) having a weight average molecular weight of 2&#xd7;10&#x2dc;4&#xd7;10and less than 5 weight % of molecules of which molecular weight is less than 1&#xd7;10and less than 5 weight % of molecules of which molecular weight is greater than 1&#xd7;10, and 2-10 weight % of polypropylene (Component II) of which weight average molecular weight is 3.0&#xd7;10&#x2dc;8.0&#xd7;10and the peak of the melting point is higher than 145&#xb0; C., and 80-50 weight % of a diluent (Component III), to mold in the form of sheets; stretching the above sheets to the form of films; extracting the diluent from the above films; and heat-setting the above films. They are also characterized by having a puncture strength of greater than 0.14 N/&#x3bc;m, Darcy's permeability constant of greater than 1.5&#xd7;10Darcy, shut-down temperature of microporous films of lower than 140&#xb0; C., and melt-down temperature of higher than 160&#xb0; C. They can enhance the performance and stability of batteries using them as well as the productivity of microporous films owing to their high thermal stability and superior extrusion compoundability and physical properties.

Microporous polyolefin film with improved meltdown property and preparing method thereof

The present invention relates to a microporous polyolefin film suitable as a separator for batteries and thermal properties thereof. A microporous polyolefin film according to the present invention has a film thickness of 5-40 &#x3bc;m, a porosity of 30%-60%, a permeability of 2.0&#xd7;10-8.0&#xd7;10Darcy, a maximum pore size determined by the bubble point method of not more than 0.1 &#x3bc;m, a puncture strength of 0.20 N/&#x3bc;m or more at room temperature and 0.05 N/&#x3bc;m or more at 120&#xb0; C., and a maximum shrinkage ratio in the transverse direction (TD) when subjected to a thickness-normalized external force in TMA (thermo-mechanical analysis) of not more than 0%. With excellent thermal stability at high temperature as well as superior puncture strength and gas permeability, the microporous polyolefin film according to the present invention is suitable for high-capacity, and high-power batteries.

Microporous polyolefin film possessing good mechanical properties and thermal stability

The present invention relates to a process for manufacturing a microporous polyolefin film which can be used for various battery separators, separating filters and membranes for microfiltration. The process for manufacturing a microporous polyolefin film according to the invention comprises mixing/extrusion through efficient and separate injection of 15-55% by weight of polyolefin (Component I), and 85-45% by weight of a diluent (Component II) which forms thermodynamic single phase with the polyolefin and a diluent (Component III) which can undergo thermodynamic liquid-liquid phase separation with the polyolefin, into an extruder.

Growing community of inventors

Daejeon, South Korea

Jang-weon Rhee