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.

公开(公告)号：US20200152945A1

公开(公告)日：2020-05-14

申请号：US16611685

申请日：2018-12-18

Applicant: LG CHEM, LTD.

Inventor： Myeong Soo KIM ,  Su Jin YOON

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

Abstract: A separator for secondary batteries, including a separator substrate having at least one surface, wherein the separator substrate comprises a polymer resin having a porous structure, a first coating layer on the separator substrate, the first coating layer includes a first inorganic material and a first binder, and a second coating layer on the first coating layer, the second coating layer includes a second inorganic material and a second binder, wherein the first coating layer further includes a third binder having a glass transition temperature lower than 30° C. and the second coating layer further includes a fourth binder having a glass transition temperature of 30° C. or higher.

公开(公告)号：US20210119302A1

公开(公告)日：2021-04-22

申请号：US17257682

申请日：2020-04-17

Applicant: LG CHEM, LTD.

Inventor： Myeong Soo KIM ,  Su Jin YOON

IPC: H01M50/451 ,  H01M10/052 ,  H01M50/403 ,  H01M50/417 ,  H01M50/434 ,  C09D7/61 ,  C09D7/45 ,  C09D7/20 ,  C09D127/16 ,  C08J9/36

Abstract: A separator for a secondary battery including a porous separator substrate including a polyolefin-based material and a coating layer on at least one surface of the porous separator substrate. The separator for a secondary battery has a uniform coating layer and improved adhesion force. The coating layer is a dry form of a slurry comprising a binder, an inorganic material, a mixed solvent including at least two solvents, and a dispersant, the inorganic material being a metal hydroxide and the dispersant being a compound including 10 to 30 hydroxy groups in one molecule.

公开(公告)号：US20190355953A1

公开(公告)日：2019-11-21

申请号：US16463441

申请日：2018-01-05

Applicant: LG CHEM, LTD.

Inventor： Kwan Woo NAM ,  Su Jin YOON ,  Hye Jin KWON ,  Chan Jong KIM ,  Je An LEE

IPC: H01M2/16 ,  H01M2/14

Abstract: A functional binder and a separator including the functional binder, in which the separator includes a porous polyolefin substrate and an organic-inorganic hybrid porous coating layer formed on at least one surface of the substrate and configured to include a mixture of inorganic particles and a binder compound, thus increasing binder-inorganic material adhesion and substrate-binder adhesion while preventing internal shorting from occurring by performing self-healing of damage to the separator, enhancing the adhesion of the separator to a cathode and an anode, and withstanding the dissolution of a transition metal of a cathode material. The binder contains 10 wt % or more of a hydroxyl group per molecule thereof.

公开(公告)号：US20190173069A1

公开(公告)日：2019-06-06

申请号：US16303030

申请日：2018-01-18

Applicant: LG CHEM, LTD.

Inventor： Hyejin KWON ,  Houngsik YOO ,  Su Jin YOON ,  Dong Hyun KIM ,  Hyeon CHOI ,  Jean LEE

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

Abstract: A method for preparing a separator, a separator prepared using the same, and an electrochemical device including the same. More specifically, stability of the separator may be reinforced by preparing the separator using a slurry prepared by pre-dispersing an inorganic material and a dispersion resin, and then mixing a binder thereto when preparing the separator.