Patents by Inventor Doo-kyung Yang

Doo-kyung Yang 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).

  • Cathode active material for lithium-sulfur battery, comprising metal sulfide nanoparticles, and method for producing same
    Patent number: 10770727
    Abstract: A positive electrode active material for a lithium-sulfur battery, and more particularly, to a positive electrode active material for a lithium-sulfur battery including metal sulfide nanoparticles and a preparation method thereof. The metal sulfide nanoparticles with large specific surface area applied to the positive electrode active material for the lithium-sulfur battery according to the present invention acts as a redox mediator during charging and discharging of the lithium-sulfur battery, thereby reducing the shuttle response by not only inhibiting the formation itself of polysulfides with elution properties, but also, even if polysulfides are eluted, adsorbing them and thus preventing them from diffusing into the electrolyte solution, and thus the capacity and life characteristics of the lithium-sulfur battery can be improved.
    Type: Grant
    Filed: November 28, 2017
    Date of Patent: September 8, 2020
    Assignee: LG CHEM, LTD.
    Inventors: Dongwook Lee, Jongwook Jung, Kwonnam Sohn, Doo Kyung Yang, Gyo Hyun Hwang
  • Electrolyte for lithium-sulfur battery and lithium-sulfur battery comprising same
    Patent number: 10770754
    Abstract: The present invention relates to an electrolyte solution for a lithium-sulfur battery and a lithium-sulfur battery including the same. The electrolyte solution for a lithium-sulfur battery according to the present invention exhibits excellent stability, and may improve a swelling phenomenon by suppressing gas generation during lithium-sulfur battery operation.
    Type: Grant
    Filed: January 18, 2017
    Date of Patent: September 8, 2020
    Assignee: LG CHEM, LTD.
    Inventors: In Tae Park, Sung Won Hong, Charles Kiseok Song, You Hwa Ohk, Doo Kyung Yang, Chang Hoon Lee
  • Lithium air battery and manufacturing method therefor
    Patent number: 10770734
    Abstract: The present invention relates to a lithium air battery and a method of manufacturing the same, wherein the lithium air battery comprises; a positive electrode which uses oxygen as an anode active material and is formed by laminating carbon black secondary particles which are composed of carbon black primary particles and graphene, and including macropores having a pore size range of exceeding 100 nm formed between the carbon black secondary particles; a negative electrode disposed to face the positive electrode; and a separation membrane disposed between the positive electrode and the negative electrode. The lithium air battery provides an increase in discharge capacity in a discharge test and a decrease in overvoltage, and can be manufactured by a simple method.
    Type: Grant
    Filed: August 12, 2016
    Date of Patent: September 8, 2020
    Assignee: LG CHEM, LTD.
    Inventors: Eunkyung Cho, Kwonnam Sohn, Jonghyun Chae, Doo Kyung Yang
  • SEPARATOR FOR LITHIUM-SULFUR BATTERIES AND LITHIUM-SULFUR BATTERY COMPRISING THE SAME
    Publication number: 20200280038
    Abstract: A separator for lithium-sulfur batteries and a lithium-sulfur battery including the same. The separator for lithium-sulfur batteries includes a separator substrate, a first coating layer formed on at least one surface of the separator substrate, and a second coating layer formed on the first coating layer. The first coating layer includes a polydopamine, and the second coating layer includes a lithium-substituted water-soluble polymer. Also a method for preparing the separator.
    Type: Application
    Filed: October 23, 2018
    Publication date: September 3, 2020
    Applicant: LG CHEM, LTD.
    Inventors: Sunjin KIM, Dongseok SHIN, Doo Kyung YANG
  • SULFUR-CARBON COMPOSITE AND LITHIUM-SULFUR BATTERY INCLUDING SAME
    Publication number: 20200280052
    Abstract: A sulfur-carbon composite and a lithium-sulfur battery including the same, and in particular, to a sulfur-carbon composite including a porous carbon material; a polymer having electrolyte liquid loading capacity; and sulfur. The porous carbon material may be coated with the polymer having electrolyte liquid loading capacity and the coated porous carbon material then mixed with the sulfur. By introducing a coating layer including the polymer having electrolyte liquid loading capacity to a surface of the porous carbon material, it is possible to improve reactivity of the sulfur and an electrolyte liquid and thereby enhance performance and lifetime properties of the lithium-sulfur battery.
    Type: Application
    Filed: October 5, 2018
    Publication date: September 3, 2020
    Applicant: LG CHEM, LTD.
    Inventors: Eunkyung CHO, Dongwook KOH, Kwonnam SOHN, Doo Kyung YANG
  • METHOD FOR IMPROVING LIFESPAN OF LITHIUM SECONDARY BATTERY
    Publication number: 20200274134
    Abstract: A method for enhancing a lifetime of a lithium secondary battery including manufacturing a battery by injecting an electrolyte liquid to an electrode assembly-embedded battery; and charging and discharging the manufactured battery; and additionally injecting an electrolyte liquid earlier than half a cycle point with respect to the number of charge and discharge cycles reaching discharge capacity of 80% compared to initial capacity is provided.
    Type: Application
    Filed: November 6, 2018
    Publication date: August 27, 2020
    Applicant: LG CHEM, LTD.
    Inventors: Gi Su PARK, Seong Ho LEE, Byounghyo JUNG, Hyunsoo LEE, Doo Kyung YANG
  • SULFUR-CARBON COMPOSITE, PREPARATION METHOD THEREFOR, AND LITHIUM SECONDARY BATTERY COMPRISING SAME
    Publication number: 20200274154
    Abstract: A sulfur-carbon composite including a porous carbon material; and sulfur coated on at least a portion of an inside and a surface of the porous carbon material, wherein a pore volume of the sulfur-carbon composite is 0.04 to 0.400 cm3/g and a specific surface area of the sulfur-carbon composite is 4.0 to 30 m2/g, and a method for preparing the same.
    Type: Application
    Filed: November 16, 2018
    Publication date: August 27, 2020
    Applicant: LG CHEM, LTD.
    Inventors: Eui Tae KIM, Suenghoon HAN, Kwonnam SOHN, Doo Kyung YANG
  • Cathode active material comprising polyimide, manufacturing method thereof, and lithium-sulfur battery comprising same
    Patent number: 10756333
    Abstract: The present invention relates to a positive electrode active material for a lithium-sulfur battery containing polyimide, more specifically, a positive electrode active material formed by complexing the composite of polyimide and carbon-based secondary particles with sulfur particles, a preparation method thereof and a lithium-sulfur battery comprising the same. If the positive electrode active material formed by including and complexing the polyimide according to the present invention is applied to the lithium-sulfur battery, the elution of the polysulfide is suppressed, and thus lifetime characteristics and energy efficiency are improved.
    Type: Grant
    Filed: July 28, 2017
    Date of Patent: August 25, 2020
    Assignee: LG CHEM, LTD.
    Inventors: Eunkyung Cho, Taek Gyoung Kim, Doo Kyung Yang
  • METHOD FOR MANUFACTURE OF SULFUR-CARBON COMPOSITE
    Publication number: 20200259169
    Abstract: A method for manufacturing a sulfur-carbon composite including the following steps of: (a) drying a porous carbon material; and (b) adding sulfur to the porous carbon material resulting from the drying of step (a), and mixing the sulfur and porous carbon material by a ball milling process and then heating the resulting ball milled product.
    Type: Application
    Filed: November 16, 2018
    Publication date: August 13, 2020
    Applicant: LG CHEM, LTD.
    Inventors: Eunkyung CHO, Suenghoon HAN, Kwonnam SOHN, Doo Kyung YANG
  • TITANIA-CARBON NANOTUBE-SULFUR (TIO2-X-CNT-S) COMPOSITE AND PREPARING METHOD THEREFOR
    Publication number: 20200255298
    Abstract: A titania-carbon-sulfur composite including a titania-carbon composite prepared by mixing cylindrical carbon materials and titania (TiO2-x), in which some oxygen is reduced (i.e., x is less than 2), to have a structure in which cylindrical carbon materials are entangled and interconnected in three dimensions; and sulfur introduced into at least a part of the external surface and inside of the titania-carbon (TiO2—C) composite, and a method for preparing the same.
    Type: Application
    Filed: September 19, 2018
    Publication date: August 13, 2020
    Applicants: LG CHEM, LTD., SOGANG UNIVERSITY RESEARCH FOUNDATION
    Inventors: Seungbo YANG, Eunkyung CHO, Jun Hyuk MOON, Kwonnam SOHN, Doo Kyung YANG, Jaehyun LEE, Donghee GUEON
  • CARBON-SULFUR COMPOSITE, PREPARATION METHOD THEREFOR, AND LITHIUM SECONDARY BATTERY COMPRISING SAME
    Publication number: 20200259168
    Abstract: A carbon-sulfur composite including a carbonized metal-organic framework (MOF); and a sulfur compound introduced to at least a part of an outside surface and an inside of the carbonized metal-organic framework, wherein the carbonized metal-organic framework has a specific surface area of 1000 m2/g to 4000 m2/g, and the carbonized metal-organic framework has a pore volume of 0.1 cc/g to 10 cc/g, and a method for preparing the same.
    Type: Application
    Filed: September 19, 2018
    Publication date: August 13, 2020
    Applicants: LG CHEM, LTD., INDUSTRY-ACADEMIC COOPERATION FOUNDATION, YONSEI UNIVERSITY
    Inventors: Eunkyung CHO, Suenghoon HAN, Myeong Jun SONG, Il To KIM, Kwonnam SOHN, Doo Kyung YANG, Jiwon KIM, Moo Whan SHIN
  • LITHIUM-SULFUR BATTERY
    Publication number: 20200235364
    Abstract: A lithium-sulfur battery is provided. More specifically, a lithium-sulfur battery including a polymer non-woven fabric containing a liquid electrolyte between a positive electrode including sulfur and a separator is provided. By including a polymer non-woven fabric containing a liquid electrolyte between a positive electrode and a separator, the lithium-sulfur battery according to the present invention is capable of continuously supplying the liquid electrolyte to the positive electrode, and suppressing polysulfide elution. Accordingly, the lithium-sulfur battery has a reduced discharge overvoltage, and exhibits excellent discharge capacity and life time properties.
    Type: Application
    Filed: July 6, 2017
    Publication date: July 23, 2020
    Applicant: LG CHEM, LTD.
    Inventors: Taek Gyoung KIM, Doo Kyung YANG, Intae PARK
  • SULFUR-CARBON COMPOSITE, PREPARATION METHOD THEREFOR, AND LITHIUM-SULFUR BATTERY COMPRISING SAME
    Publication number: 20200235394
    Abstract: A sulfur-carbon composite including a carbon-based material of which surface is modified by acid treatment is provided, as well as a method for preparing the same, and a lithium-sulfur battery including the same. A sulfur-carbon composite suppresses polysulfide elution when used as a positive electrode active material of a lithium-sulfur battery by including a carbon-based material of which surface is modified to have a hydroxyl group and a carboxyl group capable of adsorbing polysulfide on the surface. Accordingly, capacity property and life time property of the battery may be enhanced. In addition, a surface of the carbon-based material can be modified using a simple process of treating with a mixed solution of nitric acid and sulfuric acid, and a content of functional groups on the surface can be controlled depending on a mixing ratio of the nitric acid and the sulfuric acid.
    Type: Application
    Filed: May 26, 2017
    Publication date: July 23, 2020
    Applicant: LG CHEM, LTD.
    Inventors: Dongwook LEE, Kwonnam SOHN, Doo Kyung YANG
  • NEGATIVE ELECTRODE FOR LITHIUM SECONDARY BATTERY AND LITHIUM SECONDARY BATTERY COMPRISING SAME
    Publication number: 20200235386
    Abstract: A negative electrode for a lithium secondary battery including a lithium metal layer; a first protective layer formed on a surface of the lithium metal layer; and a second protective layer formed on a surface of the first protective layer opposite the lithium metal layer, wherein the first protective layer and the second protective layer are different from each other in at least one property selected from the group consisting of ion conductivity and electrolyte uptake.
    Type: Application
    Filed: November 13, 2018
    Publication date: July 23, 2020
    Applicant: LG CHEM, LTD.
    Inventors: Dongwook KOH, Doo Kyung YANG
  • LITHIUM ELECTRODE AND LITHIUM SECONDARY BATTERY INCLUDING SAME
    Publication number: 20200235379
    Abstract: A lithium electrode and a lithium secondary battery including the same. The lithium electrode has a surface oxide layer with a controlled thickness and surface roughness. The lithium electrode may be used as a negative electrode of a lithium secondary battery, for example, a lithium-sulfur secondary battery. A lithium-sulfur battery including the lithium electrode has an enhanced lifetime due to suppression of side reactions with polysulfide.
    Type: Application
    Filed: February 8, 2018
    Publication date: July 23, 2020
    Applicant: LG CHEM, LTD.
    Inventors: Taek Gyoung KIM, Jeehyun AHN, Doo Kyung YANG, Eunkyung CHO, Cholong LEE
  • METHOD FOR IMPROVING LIFETIME OF LITHIUM-SULFUR BATTERY
    Publication number: 20200227792
    Abstract: A method for producing a lithium-sulfur battery with an improved lifetime. This method includes an activation step of forming a positive electrode active material-derived compound from a compound including elemental sulfur by charging and discharging the lithium-sulfur battery, where the battery includes the compound including elemental sulfur and an electrolyte liquid. Additionally, the positive electrode active material-derived compound has a solubility of 1% by weight or greater in the electrolyte liquid. The lithium-sulfur battery may be charged and discharged in a range of greater than 2.0 V and less than 2.4 V in the activation step. Further, the lithium-sulfur battery may be charged and discharged 3 times to 10 times in the activation step. This method avoids a complicated application process of and active material in preparing a lithium-sulfur battery.
    Type: Application
    Filed: July 4, 2018
    Publication date: July 16, 2020
    Applicant: LG CHEM, LTD.
    Inventors: Intae PARK, Doo Kyung YANG
  • BINDER, AND ELECTRODE AND LITHIUM SECONDARY BATTERY COMPRISING SAME
    Publication number: 20200220177
    Abstract: A binder, an electrode and a lithium secondary battery comprising the same, wherein the binder includes a first block including a polymer containing functional groups substitutable with lithium ions and a second block. The second block may include a polymer containing oxygen atoms in the main chain. With such a binder, it is possible to prevent the agglomeration of the slurry for preparing the electrode, thereby preventing the occurrence of cracks on the surface of the electrode and improving the life characteristics of the lithium secondary battery.
    Type: Application
    Filed: September 27, 2018
    Publication date: July 9, 2020
    Applicant: LG CHEM, LTD.
    Inventors: Taek Gyoung KIM, Joo Hyeong LEE, Kyung Oh KIM, Doo Kyung YANG
  • SULFUR-CARBON COMPOSITE, PREPARATION METHOD THEREOF, AND LITHIUM SECONDARY BATTERY COMPRISING SAME
    Publication number: 20200220169
    Abstract: A sulfur-carbon composite including porous carbon material, and sulfur, wherein at least a portion of an inside and a surface of the porous carbon material coated with the sulfur, the sulfur-carbon composite has a pore volume of 0.180 cm3/g to 0.300 cm3/g, and the sulfur-carbon composite has an average pore size of 40.0 nm to 70.0 nm, and a method of manufacturing the same. Also, a method of manufacturing a sulfur-carbon composite, which includes (a) mixing a porous carbon material with sulfur particles, wherein the sulfur particles have a particle size of 1 nm to 1 ?m using a Henschel mixer; and (b) drying the resulting mixture of (a).
    Type: Application
    Filed: October 24, 2018
    Publication date: July 9, 2020
    Applicant: LG CHEM, LTD.
    Inventors: Eui Tae KIM, Kwonnam SOHN, Doo Kyung YANG
  • CATHODE FOR LITHIUM-SULFUR BATTERY, AND LITHIUM-SULFUR BATTERY COMPRISING SAME
    Publication number: 20200203756
    Abstract: A positive electrode for a lithium-sulfur battery and a lithium-sulfur battery including the same, and in particular, a positive electrode for a lithium-sulfur battery including an active material, a conductive material, a binder and an additive, wherein the additive includes an organic acid lithium salt, the organic acid lithium salt including a dicarboxyl group. By including a dicarboxyl group-including organic acid lithium salt as the additive, the positive electrode for the lithium-sulfur battery is capable of enhancing capacity and lifetime properties of the lithium-sulfur battery through enhancing lithium ion migration properties.
    Type: Application
    Filed: May 25, 2018
    Publication date: June 25, 2020
    Applicant: LG CHEM, LTD.
    Inventors: Yun Kyoung KIM, Doo Kyung YANG, Seung Yoon YANG
  • ELECTROLYTE COMPLEX FOR LITHIUM-SULFUR BATTERY, ELECTROCHEMICAL DEVICE INCLUDING THE SAME AND METHOD FOR PREPARING THE ELECTROCHEMICAL DEVICE
    Publication number: 20200203758
    Abstract: An electrolyte complex for a lithium-sulfur battery, which can improve battery capacity and life characteristic by applying different solid electrolytes to each of the positive electrode and the negative electrode of an electrochemical device, and can reduce the interfacial resistance between the electrolyte and the electrode by integrating the solid electrolyte and the electrode; an electrochemical device including the same; and a method for preparing the same. The electrolyte complex for a lithium-sulfur battery includes a first and a second phase-separated solid electrolytes, wherein the first electrolyte positioned to the positive electrode side and the second electrolyte positioned to the negative electrode side form a layered structure.
    Type: Application
    Filed: October 31, 2018
    Publication date: June 25, 2020
    Applicants: LG CHEM, LTD., UNIST(ULSAN NATIONAL INSTITUTE OF SCIENCE AND TECHNOLOGY)
    Inventors: Eunkyung PARK, Sang-Young LEE, Sung-Ju CHO, Minchul JANG, Doo Kyung YANG, Bora JUNG