Patents by Inventor Jae Ram Kim

Jae Ram Kim 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: 20250055036
    Abstract: The present disclosure relates to a high energy density lithium secondary battery having significantly improved high-temperature storage characteristics and lifespan characteristics, which are problematic when a silicon-based negative electrode active material is applied. Specifically, a lithium secondary battery according to an exemplary embodiment includes a positive electrode; a negative electrode facing the positive electrode and including a silicon-based negative electrode active material; and a non-aqueous electrolyte containing a non-aqueous organic solvent including a di-fluoro-based organic solvent and a lithium salt, wherein a content of the di-fluoro-based organic solvent is 5 to 20 vol % with respect to a total volume of the non-aqueous organic solvent.
    Type: Application
    Filed: August 5, 2024
    Publication date: February 13, 2025
    Inventors: Yeon Hwa SONG, Jae Ram KIM, Ji Won NA, Jae Yun MIN, Sang Won BAE, Ji Hee BAE, Ki Joo EOM, Myung Ro LEE, Yong Seok LEE, Jae Yeong LEE, Hyun Joong JANG
  • Publication number: 20250042748
    Abstract: An anode for a secondary battery includes an anode current collector, a first anode active material layer disposed on at least one surface of the anode current collector and including a first anode active material that includes a first silicon composite oxide, and a second anode active material layer disposed on the first anode active material layer and including a second anode active material that includes a second silicon composite oxide. Each of the first silicon composite oxide and the second silicon composite oxide includes a metal. A BET specific surface area of each of the first silicon composite oxide and the second silicon composite oxide is in a range from 2.0 m2/g to 6.5 m2/g.
    Type: Application
    Filed: July 17, 2024
    Publication date: February 6, 2025
    Inventors: Ji Hee BAE, Hyeon Soo KANG, Jae Ram KIM, Ji Won NA, So Hyun PARK, Sang Won BAE, Yeon Hwa SONG, Ki Joo EOM, Jeong Seok YEON, Myung Ro LEE, Jae Yeong LEE, Hyun Joong JANG
  • Publication number: 20250023022
    Abstract: An anode for a lithium secondary battery includes an anode current collector, and an anode active material layer formed on at least one surface of the anode current collector. The anode active material layer includes a first region adjacent to the anode current collector and a second region spaced apart from the anode current collector in a thickness direction with the first region interposed therebetween. The anode active material layer includes an anode active material including an artificial graphite-based active material and a silicon-based active material having a minimum particle diameter (Dmin) in a range from 1 ?m to 5 ?m. A content of the silicon-based active material based on a total weight of the anode active material included in the second region is greater than a content of the silicon-based active material based on a total weight of the anode active material included in the first region.
    Type: Application
    Filed: June 24, 2024
    Publication date: January 16, 2025
    Inventors: So Hyun PARK, Jae Ram KIM, Jeong Seok YEON, Ji Won NA, Sang Won BAE, Ji Hee BAE, Jae Yeong LEE
  • Publication number: 20240405208
    Abstract: An anode for a secondary battery includes an anode current collector, and an anode active material layer including a first anode active material layer and a second anode active material layer sequentially stacked from a surface of the anode current collector. Each of the first anode active material layer and the second anode active material layer includes a carbon-based active material and a silicon-based active material as an anode active material, and a carbon nanotube as a conductive material. A content of the silicon-based active material in the second anode active material layer is greater than a content of the silicon-based active material in the first anode active material layer. A Raman R value of the carbon nanotube included in the second anode active material layer is smaller than a Raman R value of the carbon nanotube included in the first anode active material layer.
    Type: Application
    Filed: August 13, 2024
    Publication date: December 5, 2024
    Inventors: Yong Seok Lee, Jae Yun Min, Jae Ram Kim, Jung Hwan Kim, Sang Won Bae, Ji Hee Bae, Myung Ro Lee, Jae Yeong Lee
  • Publication number: 20240387801
    Abstract: An anode active material composition for a lithium secondary battery includes a carbon-based anode active material and a silicon-based anode active material, wherein the carbon-based anode active material has an orientation (I004/I110, here, I004 is a peak intensity of the (004) plane when measuring X-ray diffraction (XRD) of the carbon-based anode active material, and I110 is a peak intensity of the (110) plane when measuring XRD of the carbon-based anode active material) of 2.85 or less measured by XRD.
    Type: Application
    Filed: May 16, 2024
    Publication date: November 21, 2024
    Inventors: Yong Seok LEE, Sung Do KIM, Jae Ram KIM, Jeong A KIM, So Hyun PARK, Sang Won BAE, Seung Deok SEO, Ki Joo EOM, Jong Hyuk LEE, Hyun Joong JANG
  • Publication number: 20240339666
    Abstract: A lithium secondary battery includes a cathode including a cathode active material that includes a lithium metal oxide, an anode facing the cathode and including an anode electrode active material that includes a graphite-based active material and a silicon-carbon composite, and an electrolyte solution including a lithium salt and an organic solvent, the lithium salt including lithium bis(fluorosulfonyl)imide (LiFSI) and the organic solvent including an acetate-based solvent. A content of the silicon-carbon composite is in a range from 5 wt % to 12 wt % based on a total weight of the anode active material.
    Type: Application
    Filed: April 1, 2024
    Publication date: October 10, 2024
    Inventors: Jae Yeong LEE, Jae Ram KIM, Ji Won NA, Sang Won BAE, Ji Hee BAE, Yeon Hwa SONG, Ki Joo EOM, Myung Ro LEE, Yong Seok LEE, Hyun Joong JANG
  • Publication number: 20240266507
    Abstract: According to an embodiment, a lithium secondary battery substantially suppressing volume expansion of a silicon-based active material and having excellent characteristics such as capacity, lifespan, and the like is provided. An anode for the lithium secondary battery includes a current collector; a first anode mixture layer on at least one surface of the current collector; and a second anode mixture layer on the first anode mixture layer, wherein the first anode mixture layer and the second anode mixture layer include a carbon-based active material, respectively, the second anode mixture layer includes a silicon-based active material, and an upper and lower layer unit capacity ratio (Ruc) is 1.1 or more.
    Type: Application
    Filed: December 15, 2023
    Publication date: August 8, 2024
    Inventors: Hyun Joong JANG, Jae Ram KIM, Ki Joo EOM, Yong Seok LEE
  • Publication number: 20240241188
    Abstract: An apparatus and method for detecting a defective battery cell is proposed. The proposed apparatus includes a charger for supplying current to cause a battery cell to maintain a constant voltage, a measurement part for measuring the voltage and current of the battery cell, and a controller for determining whether a defect exists in the battery cell on the basis of the current measured by the measurement part, whereby the defective battery cell may be detected with high accuracy, a time required for the detection may be shortened, and a space required for the detection may also be reduced.
    Type: Application
    Filed: December 22, 2023
    Publication date: July 18, 2024
    Inventors: Ji Won NA, Jae Ram KIM, Sang Won BAE, Ji Hee BAE, Yeon Hwa SONG, Ki Joo EOM, Myung Ro LEE, Jae Yeong LEE, Hyun Joong JANG
  • Publication number: 20240234691
    Abstract: An anode for a lithium secondary battery includes a anode current collector, a first anode mixture layer disposed on at least one surface of the anode current collector and including a first carbon-based active material and a silicon-based active material including a porous structure, and a second anode mixture layer disposed on the first anode mixture layer and including a second carbon-based active material and a silicon-based active material doped with magnesium.
    Type: Application
    Filed: August 21, 2023
    Publication date: July 11, 2024
    Inventors: Jeong A KIM, Yong Seok LEE, Jae Ram KIM
  • Publication number: 20240178366
    Abstract: A cathode for a lithium secondary battery includes a cathode current collector, a first cathode active material layer on the cathode current collector and a second cathode active material layer on the first cathode active material layer. The first cathode active material layer includes first cathode active material particles and a first binder. The first cathode active material particles include large-scaled particles having an average diameter (D50) from 10 ?m to 20 ?m and small-scaled particles having an average (D50) diameter from 1 ?m to 9 ?m. The second cathode active material layer includes second cathode active material particles having an average diameter (D50) from 1 ?m to 20 ?m and a second binder.
    Type: Application
    Filed: November 21, 2023
    Publication date: May 30, 2024
    Inventors: Jae Ram Kim, Yong Seok Lee, Ki Joo Eom, Hyun Joong Jang
  • Publication number: 20240154110
    Abstract: Cathodes and lithium secondary batteries including the cathodes are disclosed. In some implementations, a cathode may include a cathode current collector and a cathode active material layer disposed on the cathode current collector and including cathode active material particles such that the cathode active material layer satisfies a specific equation. The cathode active material particles may include lithium metal oxide particles that include nickel, and may have a mole fraction of cobalt of 0.02 or less with respect to all elements except for lithium and oxygen.
    Type: Application
    Filed: August 28, 2023
    Publication date: May 9, 2024
    Inventors: Yong Seok LEE, Jeong Hoon JEUN, Jae Ram KIM, Jae Yun MIN, Ki Joo EOM, Myung Ro LEE, Hyun Joong JANG, Je Nam CHOI
  • Patent number: 11978901
    Abstract: A cathode for a lithium secondary battery includes a cathode current collector, and a cathode active material layer formed on the cathode current collector. The cathode active material layer includes a cathode active material and a conductive material ID/IG is in a range from 0.5 to 1.25 in a Raman spectrum of the cathode active material layer. The cathode active material includes lithium metal oxide particles containing nickel and manganese and having a content of cobalt of less than 2 mol % among all elements except for lithium and oxygen.
    Type: Grant
    Filed: June 20, 2023
    Date of Patent: May 7, 2024
    Assignee: SK ON CO., LTD.
    Inventors: Yong Seok Lee, Jae Ram Kim, Ji Won Na, Sang Won Bae, Yeon Hwa Song, Ki Joo Eom, Myung Ro Lee, Jae Yeong Lee, Hyun Joong Jang
  • Publication number: 20240136504
    Abstract: An anode for a lithium secondary battery includes a anode current collector, a first anode mixture layer disposed on at least one surface of the anode current collector and including a first carbon-based active material and a silicon-based active material including a porous structure, and a second anode mixture layer disposed on the first anode mixture layer and including a second carbon-based active material and a silicon-based active material doped with magnesium.
    Type: Application
    Filed: August 20, 2023
    Publication date: April 25, 2024
    Inventors: Jeong A KIM, Yong Seok LEE, Jae Ram KIM
  • Publication number: 20240097125
    Abstract: A cathode for a lithium secondary battery includes a cathode current collector, and a cathode active material layer formed on the cathode current collector. The cathode active material layer includes cathode active material particles. The cathode active material particles include a lithium metal oxide particle containing nickel and having a mole fraction of cobalt of 0.02 or less among all elements except lithium and oxygen.
    Type: Application
    Filed: July 11, 2023
    Publication date: March 21, 2024
    Inventors: Yong Seok LEE, Jeong Hoon JEUN, Jae Ram KIM, Jae Yun MIN, Ki Joo EOM, Myung Ro LEE, Hyun Joong JANG, Je Nam CHOI
  • Publication number: 20240006606
    Abstract: A cathode for a lithium secondary battery includes a cathode current collector, and a cathode active material layer formed on the cathode current collector. The cathode active material layer includes a cathode active material and a conductive material ID/IG is in a range from 0.5 to 1.25 in a Raman spectrum of the cathode active material layer. The cathode active material includes lithium metal oxide particles containing nickel and manganese and having a content of cobalt of less than 2 mol % among all elements except for lithium and oxygen.
    Type: Application
    Filed: June 20, 2023
    Publication date: January 4, 2024
    Inventors: Yong Seok LEE, Jae Ram KIM, Ji Won NA, Sang Won BAE, Yeon Hwa SONG, Ki Joo EOM, Myung Ro LEE, Jae Yeong LEE, Hyun Joong JANG
  • Publication number: 20230268506
    Abstract: An anode for a secondary battery includes a first anode mixture layer disposed on an anode current collector and a second anode mixture layer disposed on a surface of the anode, wherein the first and second anode mixture layers include a graphite-based anode active material of graphite secondary particles, at least the second anode mixture layer includes a graphite-based anode active material of graphite primary particles, and a content [A2] of graphite primary particles included in the second anode mixture layer is greater than a content [A1] of graphite primary particles included in the first anode mixture layer.
    Type: Application
    Filed: February 20, 2023
    Publication date: August 24, 2023
    Inventors: Hyun Joong JANG, Jae Ram KIM, Yong Seok LEE
  • Publication number: 20230246169
    Abstract: An anode active material for a lithium secondary battery according to embodiments of the present invention includes a carbon-based active material and a silicon-based active material including silicon-based active material particles having a particle size distribution in a range from 1 ?m to 19 ?m. A lithium secondary battery having improved life-span and rapid charge/discharge properties at room temperature is provided.
    Type: Application
    Filed: February 2, 2023
    Publication date: August 3, 2023
    Inventors: Yong Seok LEE, Jae Ram KIM, Sang Won BAE, Yeon Hwa SONG, Ki Joo EOM, Myung Ro LEE, Jae Yeong LEE, Hyun Joong JANG
  • Publication number: 20220407052
    Abstract: Lithium secondary batteries for improving life span and resistance properties are disclosed. In an aspect, a cathode composition for a lithium secondary battery includes a cathode active material that includes a first cathode active material particle having a secondary particle shape and a second cathode active material particle having a single particle shape, and a conductive material including a linear-type conductive material.
    Type: Application
    Filed: June 9, 2022
    Publication date: December 22, 2022
    Inventors: Yong Seok LEE, Jae Ram KIM, Jung Hwan KIM, Jae Yun MIN, Sang Won BAE, Myung Ro LEE, Jae Yeong LEE, Hyun Joong JANG
  • Publication number: 20220328827
    Abstract: Provided are a negative electrode for a secondary battery including: a current collector; a first coating layer including a point-type conductive material and a binder, formed on the current collector; and a second coating layer including a silicon-based active material, formed on the first coating layer, and a lithium secondary battery including the same.
    Type: Application
    Filed: December 30, 2021
    Publication date: October 13, 2022
    Inventors: Yong Seok Lee, Sang Won Bae, Myung Ro Lee, Jae Ram Kim, Jung Hwan Kim
  • Publication number: 20220310991
    Abstract: An anode for a secondary battery includes an anode current collector, and an anode active material layer including a first anode active material layer and a second anode active material layer sequentially stacked from a surface of the anode current collector. Each of the first anode active material layer and the second anode active material layer includes a carbon-based active material and a silicon-based active material as an anode active material, and a carbon nanotube as a conductive material. A content of the silicon-based active material in the second anode active material layer is greater than a content of the silicon-based active material in the first anode active material layer. A Raman R value of the carbon nanotube included in the second anode active material layer is smaller than a Raman R value of the carbon nanotube included in the first anode active material layer.
    Type: Application
    Filed: January 6, 2022
    Publication date: September 29, 2022
    Inventors: Yong Seok Lee, Jae Yun Min, Jae Ram Kim, Jung Hwan Kim, Sang Won Bae, Ji Hee Bae, Myung Ro Lee, Jae Yeong Lee