公开(公告)号：US20210050577A1

公开(公告)日：2021-02-18

申请号：US17051280

申请日：2020-01-16

Applicant: LG CHEM, LTD.

Inventor： Kyung Ryun KA ,  Su Jin PARK ,  Sang Joon LEE ,  Je An LEE

IPC: H01M2/16 ,  H01M2/14 ,  H01M10/0525

Abstract: A separator having a polyolefin substrate, first coating layer including first inorganic particles on at least one surface of the polyolefin substrate and a second coating layer including second inorganic particles on a surface of the first coating layer opposite the polyolefin substrate, An average particle size of the first inorganic material particles of the first coating layer is greater than an average particle size of the second, inorganic material particles of the second coating layer. The first inorganic particles of the first coating layer are 900 nm or more based on. D50, and the second inorganic particles of the second coating layer are 10 nm or more and 500 nm or less based on D50.

公开(公告)号：US20210135316A1

公开(公告)日：2021-05-06

申请号：US16612164

申请日：2018-12-21

Applicant: LG CHEM, LTD.

Inventor： In Hyouk SUNG ,  Su Jin YOON ,  Sang Joon LEE ,  Hye Jin KWON

IPC: H01M50/451 ,  H01M10/0525 ,  H01M50/417 ,  H01M50/434

Abstract: A separator for secondary batteries, including: a separator substrate having at least one surface, wherein the separator substrate includes a polyolefin-based polymer resin having a porous structure, and a coating layer is applied to one surface or opposite surfaces of a separator substrate made of a polyolefin-based polymer resin having a porous structure, wherein the coating layer includes a thickener, a filler, a particle-type binder, and a dissolution-type binder, wherein the thickener comprises carboxymethyl cellulose, and wherein an amount of the particle-type binder is greater than an amount of the dissolution-type binder.