Samsung Sdi Co., Inc.

Jung Sue Jang

Sang Ho Lee

Jae Hyun Cho

Kee Wook Kim

Jung Seong Lee

Jun Ho Chung

Dae Hyun Hong

Yong Bae Lee

Yun Gi Kim

The present invention relates to a method for manufacturing a separator in which the tensile strength is enhanced and melt shrinkage is reduced by controlling elongation step from among the manufacturing steps thereof. Additionally, the present invention relates to a separator having superb winding processability as well as superb thermal stability due to the raised the tensile strength while maintaining a low rate of melt shrinkage. Furthermore, the present invention relates to an electrochemical battery having enhanced stability by utilizing a separator having high tensile strength and a low rate of melt shrinkage.

Method for manufacturing separation film and the separation film, and battery using same

A polyolefin-based porous separator, including a first polyolefin-based porous film on a first surface of a second polyolefin-based porous film, and a third polyolefin-based porous film on a second surface of the second polyolefin-based porous film, each of the first and third polyolefin-based porous films containing inorganic particles having an average particle size of 10 nm to 100 nm, a thickness ratio of the first polyolefin-based porous film, the second polyolefin-based porous film, and the third polyolefin-based porous film being 0.5 to 1.5:1 to 6:0.5 to 1.5, and thermal shrinkage rates of the separator in a machine direction and a transverse direction measured after standing at 120&#xb0; C. for 1 hour each being 5% or less, and air permeability of the separator being 250 sec/100 cc or less.

Separator, method of manufacturing the same and battery using the same

A method for manufacturing a polyolefin separator, including forming a sheet including a polyolefin resin and a plasticizer; stretching the sheet Etimes in a longitudinal direction at a temperature of T, followed by stretching the sheet Etimes in a transverse direction at a temperature of T, wherein T&#x3c;115&#xb0; C., T&#x3c;115&#xb0; C., and T&#x2267;T, and E&#xd7;E=55 to 80, E&#x2267;7, and E&#x2267;7; and extracting the plasticizer from the stretched sheet.

Porous polyolefin separator and method for manufacturing the same

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Suwon-si, South Korea

Jung Sue Jang