Patents by Inventor Bi-Oh Ryu

Bi-Oh Ryu has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Publication number: 20200373540
    Abstract: A separator for an electrochemical device is provided. The separator comprises a porous substrate having a plurality of pores and a porous coating layer positioned on at least one surface of the porous substrate, the porous coating layer including a plurality of inorganic particles and a binder polymer positioned on a whole or a part of the surface of the inorganic particles to connect the inorganic particles with one another and fix the inorganic particles, wherein the binder polymer comprises a first binder polymer and a second binder polymer. The first binder polymer is poly(vinylidene fluoride-co-hexafluoroproyplene) (PVdF-HFP), and the second binder polymer is poly(vinylidene fluoride-co-tetrafluoroethylene) (PVdF-TFE). The first binder polymer has an electrolyte uptake of 80-165%, and the second binder polymer has an electrolyte uptake of 20-40%. An electrochemical device including the separator is also disclosed.
    Type: Application
    Filed: September 16, 2019
    Publication date: November 26, 2020
    Applicant: LG Chem, Ltd.
    Inventors: A-Young Lee, Joo-Sung Lee, Won-Sik Bae, Bi-Oh Ryu
  • Publication number: 20200369816
    Abstract: The present invention relates to an aromatic poly(amide-imide) copolymer film having high retardation in the thickness direction and exhibiting a low moisture absorption rate, and a method for preparing the same.
    Type: Application
    Filed: December 7, 2018
    Publication date: November 26, 2020
    Applicant: LG CHEM, LTD.
    Inventors: Bi Oh RYU, Soonyong PARK, Youngseok PARK, Il Hwan CHOI, Young Ji TAE, Kwanyeol PAEK
  • Publication number: 20200365860
    Abstract: The present disclosure relates to a A method for manufacturing a crosslinked polyolefin separator and the crosslinked polyolefin separator obtained by the method are provided. The method includes (S1) mixing polyolefin, a diluting agent, an initiator and alkoxysilane containing a carbon-carbon double bonded group to an extruder, and then carrying out extrusion to obtain a silane-grafted polyolefin composition; (S2) molding and orienting the extruded silane-grafted polyolefin composition in the form of a sheet; (S3) introducing the oriented sheet to an extraction water bath containing a crosslinking catalyst to extract the diluting agent and perform aqueous crosslinking; and (S4) thermally fixing a resultant aqueous crosslinked product. The method can provide a separator having a high meltdown temperature and improved heat shrinkage.
    Type: Application
    Filed: September 3, 2019
    Publication date: November 19, 2020
    Applicant: LG Chem, Ltd.
    Inventors: Bi-Oh Ryu, Won-Sik Bae, Joo-Sung Lee, A-Young Lee
  • Publication number: 20200266410
    Abstract: A method for manufacturing a crosslinked polyolefin separator and a separator are provided. The method includes putting a polyolefin and a polyolefin elastomer into an extruder first, and putting an alkoxy silane containing a carbon-carbon double bond functional group, an initiator and a crosslinking catalyst to form the separator. The crosslinked polyolefin separator has high meltdown temperature and low shutdown temperature.
    Type: Application
    Filed: August 14, 2019
    Publication date: August 20, 2020
    Applicant: LG Chem, Ltd.
    Inventors: Won-Sik Bae, Bi-Oh Ryu, Joo-Sung Lee
  • Publication number: 20200266411
    Abstract: A method for manufacturing a crosslinked polyolefin separator, including the steps of: (S1) introducing polyolefin having a weight average molecular weight of 200,000-1,000,000, a first diluting agent, alkoxysilane containing a carbon-carbon double bonded group, an initiator and a crosslinking catalyst to an extruder; (S2) introducing a second diluting agent to the extruder, followed by mixing, to carry out reactive extrusion of a silane-grafted polyolefin composition; (S3) molding and orienting the reactive extruded silane-grafted polyolefin composition in a form of a sheet; (S4) extracting the first diluting agent and the second diluting agent from the oriented sheet to obtain a silane-grafted polyolefin porous membrane; (S5) thermally fixing the porous membrane; and (S6) crosslinking the porous membrane in the presence of water and a crosslinked polyolefin separator are provided.
    Type: Application
    Filed: June 11, 2019
    Publication date: August 20, 2020
    Applicant: LG Chem, Ltd.
    Inventors: Joo-Sung Lee, Won-Sik Bae, Bi-Oh Ryu, Heon-Sik Song
  • Publication number: 20200220139
    Abstract: A crosslinked polyolefin separator which has gels with a longer side length of 50 ?m or more in a number ranging from 0 to 3 per 1 m2 of the separator, and shows a standard deviation of absorbance ratio between the center of the separator and the side thereof ranging from 0.01 to 0.5 is provided. A method for manufacturing the crosslinked polyolefin separator is also provided. The method includes (S1) preparing a polyolefin porous membranes, and (S2) applying a coating solution containing an initiator and alkoxy group-containing vinylsilane onto at least one surface of the porous membrane. The coating solution can permeate even to the inside of exposed pores. Thus, it is possible to provide a crosslinked polyolefin separator in which silane crosslinking occurs uniformly even inside of the pores.
    Type: Application
    Filed: July 26, 2019
    Publication date: July 9, 2020
    Applicant: LG Chem, Ltd.
    Inventors: Joo-Sung Lee, Bi-Oh Ryu, Won-Sik Bae, A-Young Lee, Heon-Sik Song
  • Publication number: 20200024401
    Abstract: A poly(amide-imide) copolymer composition comprising an imide of a polyamic acid and an ultraviolet stabilizer, and a colorless and transparent poly(amide-imide) film including the composition. The poly(amide-imide) copolymer composition according to the present disclosure makes it possible to provide a poly(amide-imide) film exhibiting excellent scratch resistance, UV shielding property, and UV weather resistance while being colorless and transparent. This film can be suitably used as a cover film of various flexible or foldable devices.
    Type: Application
    Filed: April 10, 2018
    Publication date: January 23, 2020
    Applicant: LG CHEM, LTD.
    Inventors: Bi Oh RYU, Soon Yong PARK, Young Ji TAE, Young Seok PARK, Kwan Yeol PAEK, Il Hwan CHOI
  • Patent number: 10505167
    Abstract: The present disclosure provides a separator for an electrochemical device, comprising: a porous polymer film; and a porous coating layer formed on one or both surfaces of the porous polymer film and comprising at least one of inorganic particles and organic particles, and a binder polymer, wherein fibrils in the surface of the porous polymer film are entangled with the particles in the porous coating layer in the contact surface between the porous polymer film and the porous coating layer, and the separator has an air permeability of 100 to 800 sec/100 cc, an electrical resistance of 0.5 to 1.5?, and a heat-shrinkage rate of 8% or less in each of machine and transverse directions, and an electrochemical device having the same.
    Type: Grant
    Filed: November 6, 2014
    Date of Patent: December 10, 2019
    Assignee: LG CHEM, LTD.
    Inventors: Bi-Oh Ryu, Kyung-Hwan Yoon, Heon-Sik Song
  • Publication number: 20190263095
    Abstract: The plastic laminated film has both excellent mechanical properties and UV weathering resistance while being colorless and transparent, and can be suitably used as cover films for various flexible or foldable devices.
    Type: Application
    Filed: November 14, 2017
    Publication date: August 29, 2019
    Applicant: LG Chem, Ltd.
    Inventors: Kwan Yeol PAEK, Soon Yong PARK, Young Ji TAE, Young Seok PARK, Bi Oh RYU, Il Hwan CHOI
  • Publication number: 20190153161
    Abstract: A polyamideimide copolymer which is an imide of a polyamic acid resulting from copolymerizing an aromatic diamine monomer, an aromatic dianhydride monomer, and an aromatic dicarbonyl monomer and a colorless and transparent polyamideimide film including the polyamideimide copolymer. The polyamideimide copolymer according to the present disclosure makes it possible to provide a polyamideimide film exhibiting excellent scratch resistance while being colorless and transparent.
    Type: Application
    Filed: November 29, 2017
    Publication date: May 23, 2019
    Applicant: LG CHEM, LTD.
    Inventors: Bi Oh RYU, Kwan Yeol PAEK, Young Ji TAE, Soon Yong PARK, Young Seok PARK
  • Patent number: 10056589
    Abstract: A method of manufacturing a separator for an electrochemical device according to an exemplary embodiment of the present disclosure includes extruding a resin composition including polyolefin and a diluent, stretching the extruded resin composition to obtain a polyolefin film, extracting the diluent from the obtained polyolefin film to obtain a porous polyolefin film, coating a slurry for forming a porous coating layer on at least one surface of the porous polyolefin film, and heat setting the porous polyolefin film coated with the slurry to obtain a composite separator with a porous coating layer.
    Type: Grant
    Filed: October 31, 2014
    Date of Patent: August 21, 2018
    Assignee: LG CHEM, LTD.
    Inventors: Bi-Oh Ryu, Heon-Sik Song
  • Patent number: 9905824
    Abstract: Disclosed is a separator for an electrochemical device including a porous polymer film, and a porous coating layer including at least one type of particles of inorganic particles and organic particles and binder polymer, the porous coating layer formed on one surface or both surfaces of the porous polymer film, wherein the porous polymer film has a structure in which multiple fibrils arranged parallel to the surface of the film are stacked in layers, and the fibrils are bound to each other to form a lamellar structure with a size from 130 to 200 nm and tortuosity of the porous polymer film is from 1.60 to 1.90, and an electrochemical device comprising the same.
    Type: Grant
    Filed: December 17, 2014
    Date of Patent: February 27, 2018
    Assignee: LG CHEM, LTD.
    Inventors: Bi-Oh Ryu, Kyung-Hwan Yoon, Heon-Sik Song
  • Patent number: 9887405
    Abstract: Disclosed is a method of preparing a crosslinked polyolefin separator including preparing a silane grafted polyolefin solution using a polyolefin having a weight average molecular weight higher than or equal to 200,000, a diluent, an alkoxy group containing vinylsilane, and an initiator, forming the silane grafted polyolefin solution in a sheet shape and stretching, extracting the diluent from the stretched sheet to produce a porous membrane, and crosslinking the porous membrane in the presence of water, and a crosslinked polyolefin separator.
    Type: Grant
    Filed: October 30, 2015
    Date of Patent: February 6, 2018
    Assignee: LG CHEM, LTD.
    Inventors: Cheon-Il Park, Won-Sik Bae, Bi-Oh Ryu, Kyoung-Min Kim, Heon-Sik Song
  • Patent number: 9825271
    Abstract: Disclosed is a separator for an electrochemical device including a porous polymer film, and a porous coating layer including at least one type of particles of inorganic particles and organic particles and binder polymer, the porous coating layer formed on one surface or both surfaces of the porous polymer film, wherein the porous polymer film has a structure in which multiple fibrils arranged parallel to the surface of the film are stacked in layers, and a diameter of the fibril disposed at the side of one surface of the film where the porous coating layer is formed is smaller than a diameter of the fibril disposed at a central part in a thickness-wise direction of the film, and an electrochemical device comprising the same.
    Type: Grant
    Filed: November 4, 2014
    Date of Patent: November 21, 2017
    Assignee: LG CHEM, LTD.
    Inventors: Kyung-Hwan Yoon, Bi-Oh Ryu, Sung-Jae Han, Heon-Sik Song, Hyun-Ah Park
  • Publication number: 20160218340
    Abstract: Disclosed is a separator for an electrochemical device including a porous polymer film, and a porous coating layer including at least one type of particles of inorganic particles and organic particles and binder polymer, the porous coating layer formed on one surface or both surfaces of the porous polymer film, wherein the porous polymer film has a structure in which multiple fibrils arranged parallel to the surface of the film are stacked in layers, and the fibrils are bound to each other to form a lamellar structure with a size from 130 to 200 nm and tortuosity of the porous polymer film is from 1.60 to 1.90, and an electrochemical device comprising the same.
    Type: Application
    Filed: December 17, 2014
    Publication date: July 28, 2016
    Applicant: LG CHEM, LTD.
    Inventors: Bi-Oh RYU, Kyung-Hwan YOON, Heon-Sik SONG
  • Publication number: 20160204406
    Abstract: The present disclosure provides a separator for an electrochemical device, comprising: a porous polymer film; and a porous coating layer formed on one or both surfaces of the porous polymer film and comprising at least one of inorganic particles and organic particles, and a binder polymer, wherein fibrils in the surface of the porous polymer film are entangled with the particles in the porous coating layer in the contact surface between the porous polymer film and the porous coating layer, and the separator has an air permeability of 100 to 800 sec/100 cc, an electrical resistance of 0.5 to 1.5?, and a heat-shrinkage rate of 8% or less in each of machine and transverse directions, and an electrochemical device having the same.
    Type: Application
    Filed: November 6, 2014
    Publication date: July 14, 2016
    Applicant: LG CHEM, LTD.
    Inventors: Bi-Oh RYU, Kyung-Hwan YOON, Heon-Sik SONG
  • Publication number: 20160149185
    Abstract: Disclosed is a separator for an electrochemical device including a porous polymer film, and a porous coating layer including at least one type of particles of inorganic particles and organic particles and binder polymer, the porous coating layer formed on one surface or both surfaces of the porous polymer film, wherein the porous polymer film has a structure in which multiple fibrils arranged parallel to the surface of the film are stacked in layers, and a diameter of the fibril disposed at the side of one surface of the film where the porous coating layer is formed is smaller than a diameter of the fibril disposed at a central part in a thickness-wise direction of the film, and an electrochemical device comprising the same.
    Type: Application
    Filed: November 4, 2014
    Publication date: May 26, 2016
    Applicant: LG CHEM, LTD.
    Inventors: Kyung-Hwan YOON, Bi-Oh RYU, Sung-Jae HAN, Heon-Sik SONG, Hyun-Ah PARK
  • Publication number: 20160141574
    Abstract: A method of manufacturing a separator for an electrochemical device according to an exemplary embodiment of the present disclosure includes extruding a resin composition including polyolefin and a diluent, stretching the extruded resin composition to obtain a polyolefin film, extracting the diluent from the obtained polyolefin film to obtain a porous polyolefin film, coating a slurry for forming a porous coating layer on at least one surface of the porous polyolefin film, and heat setting the porous polyolefin film coated with the slurry to obtain a composite separator with a porous coating layer.
    Type: Application
    Filed: October 31, 2014
    Publication date: May 19, 2016
    Applicant: LG CHEM, LTD.
    Inventors: Bi-Oh RYU, Heon-Sik SONG
  • Publication number: 20160126518
    Abstract: Disclosed is a method of preparing a crosslinked polyolefin separator including preparing a silane grafted polyolefin solution using a polyolefin having a weight average molecular weight higher than or equal to 200,000, a diluent, an alkoxy group containing vinylsilane, and an initiator, forming the silane grafted polyolefin solution in a sheet shape and stretching, extracting the diluent from the stretched sheet to produce a porous membrane, and crosslinking the porous membrane in the presence of water, and a crosslinked polyolefin separator.
    Type: Application
    Filed: October 30, 2015
    Publication date: May 5, 2016
    Inventors: Cheon-Il PARK, Won-Sik Bae, Bi-Oh Ryu, Kyoung-Min Kim, Heon-Sik Song