Patents by Inventor Yurim CHA

Yurim CHA 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).

  • Patent number: 12176540
    Abstract: A negative active material for a rechargeable lithium battery and a rechargeable lithium battery that includes the negative active material. The negative active material includes a first active material, which includes tertiary particles of natural graphite in which secondary particles are agglomerated. Primary particles are agglomerated and spheroidized in the secondary particles. Artificial graphite is positioned on a surface of the primary particles and a surface of the secondary particles. An amorphous carbon coating layer surrounds the tertiary particles of natural graphite. Further, the negative active material includes a second active material, which includes a carbon-based material having an aspect ratio of about 2 to about 100.
    Type: Grant
    Filed: November 2, 2023
    Date of Patent: December 24, 2024
    Assignee: SAMSUNG SDI CO., LTD.
    Inventors: Hee Seon Choi, Deok-Hyun Kim, Yurim Cha, Narae Kim
  • Publication number: 20240379959
    Abstract: A negative active material for a rechargeable lithium battery and a rechargeable lithium battery that includes the negative active material. The negative active material includes a first active material, which includes tertiary particles of natural graphite in which secondary particles are agglomerated. Primary particles are agglomerated and spheroidized in the secondary particles. Artificial graphite is positioned on a surface of the primary particles and a surface of the secondary particles. An amorphous carbon coating layer surrounds the tertiary particles of natural graphite. Further, the negative active material includes a second active material, which includes a carbon-based material having an aspect ratio of about 2 to about 100.
    Type: Application
    Filed: November 2, 2023
    Publication date: November 14, 2024
    Inventors: Hee Seon CHOI, Deok-Hyun KIM, Yurim CHA, Narae KIM
  • Patent number: 12132194
    Abstract: A negative active material for a rechargeable lithium battery and a rechargeable lithium battery including the same are disclosed, and the negative active material includes a primary particle of a crystalline carbon-based material and secondary particle that is an assembly of the primary particles, wherein a ratio of an average particle diameter (D50) of the secondary particle relative to an average particle diameter (D50) of the primary particle (average particle diameter (D50) of the secondary particle/average particle diameter (D50) of the primary particle) ranges from about 1.5 to about 5 and an aspect ratio of the primary particle ranges from about 1 to about 7.
    Type: Grant
    Filed: May 31, 2023
    Date of Patent: October 29, 2024
    Assignee: Samsung SDI Co., Ltd.
    Inventors: Ji Woo Ahn, Dongwoo Kim, Jaehou Nah, Bumjin Chang, Yurim Cha, Yeonjoo Choi, Ilyoung Choi
  • Publication number: 20240347730
    Abstract: A negative active material and a rechargeable lithium battery including the same are provided. The negative active material includes (e.g., consists of) an amorphous carbon material, low crystalline graphite particles and pores within the amorphous carbon material and/or the low crystalline graphite particles, wherein a ratio of a cross-sectional area of the pores relative to a cross-sectional area of the negative active material is about 4% to about 10%.
    Type: Application
    Filed: October 16, 2023
    Publication date: October 17, 2024
    Inventors: Narae KIM, Yurim CHA, Seyoung OH, Deok-Hyun KIM, Chungku YEO
  • Publication number: 20240250243
    Abstract: A negative active material for a rechargeable lithium battery, including tertiary particles including graphite and an agglomerated product where secondary particles where g a plurality of primary particles is agglomerated and spheroidized, are agglomerated, and an amorphous carbon coating layer surrounding the tertiary particles.
    Type: Application
    Filed: December 27, 2023
    Publication date: July 25, 2024
    Inventors: Narae KIM, Deok-Hyun KIM, Hee Seon CHOI, Yurim CHA
  • Publication number: 20240243260
    Abstract: A negative electrode active material composite, a method of manufacturing the same, a negative electrode including the same, and a rechargeable lithium battery, the negative electrode active material composite includes secondary particles in which artificial graphite primary particles are assembled; and a conductive material in internal gaps of the secondary particles; wherein at least some of the artificial graphite primary particles include an amorphous carbon coating layer on a surface thereof.
    Type: Application
    Filed: October 16, 2023
    Publication date: July 18, 2024
    Inventors: Seyoung OH, Yurim CHA, Yungu CHO, Eunji KANG
  • Publication number: 20230307607
    Abstract: A negative active material for a rechargeable lithium battery and a rechargeable lithium battery including the same are disclosed, and the negative active material includes a primary particle of a crystalline carbon-based material and secondary particle that is an assembly of the primary particles, wherein a ratio of an average particle diameter (D50) of the secondary particle relative to an average particle diameter (D50) of the primary particle (average particle diameter (D50) of the secondary particle/average particle diameter (D50) of the primary particle) ranges from about 1.5 to about 5 and an aspect ratio of the primary particle ranges from about 1 to about 7.
    Type: Application
    Filed: May 31, 2023
    Publication date: September 28, 2023
    Inventors: Ji Woo AHN, Dongwoo KIM, Jaehou NAH, Bumjin CHANG, Yurim CHA, Yeonjoo CHOI, Ilyoung CHOI
  • Patent number: 11705552
    Abstract: A negative active material for a rechargeable lithium battery and a rechargeable lithium battery including the same are disclosed, and the negative active material includes a primary particle of a crystalline carbon-based material and secondary particle that is an assembly of the primary particles, wherein a ratio of an average particle diameter (D50) of the secondary particle relative to an average particle diameter (D50) of the primary particle (average particle diameter (D50) of the secondary particle/average particle diameter (D50) of the primary particle) ranges from about 1.5 to about 5 and an aspect ratio of the primary particle ranges from about 1 to about 7.
    Type: Grant
    Filed: July 10, 2017
    Date of Patent: July 18, 2023
    Assignee: Samsung SDI Co., Ltd.
    Inventors: Ji Woo Ahn, Dongwoo Kim, Jaehou Nah, Bumjin Chang, Yurim Cha, Yeonjoo Choi, Ilyoung Choi
  • Patent number: 11335906
    Abstract: A negative active material for a rechargeable lithium battery includes: a core including crystalline carbon; and a metal alkoxide on a surface of the core. A rechargeable lithium battery includes: a negative electrode including a negative active material including a core including crystalline carbon, and a metal alkoxide on a surface of the core; a positive electrode including a positive active material; and an electrolyte.
    Type: Grant
    Filed: June 11, 2019
    Date of Patent: May 17, 2022
    Assignee: Samsung SDI Co., Ltd.
    Inventors: Joongho Moon, Eunji Kang, Yurim Cha, Soonbong Choi
  • Publication number: 20190386297
    Abstract: A negative active material for a rechargeable lithium battery includes: a core including crystalline carbon; and a metal alkoxide on a surface of the core. A rechargeable lithium battery includes: a negative electrode including a negative active material including a core including crystalline carbon, and a metal alkoxide on a surface of the core; a positive electrode including a positive active material; and an electrolyte.
    Type: Application
    Filed: June 11, 2019
    Publication date: December 19, 2019
    Inventors: Joongho MOON, Eunji KANG, Yurim CHA, Soonbong CHOI
  • Publication number: 20190229325
    Abstract: A negative active material for a rechargeable lithium battery and a rechargeable lithium battery including the same are disclosed, and the negative active material includes a primary particle of a crystalline carbon-based material and secondary particle that is an assembly of the primary particles, wherein a ratio of an average particle diameter (D50) of the secondary particle relative to an average particle diameter (D50) of the primary particle (average particle diameter (D50) of the secondary particle/average particle diameter (D50) of the primary particle) ranges from about 1.5 to about 5 and an aspect ratio of the primary particle ranges from about 1 to about 7.
    Type: Application
    Filed: July 10, 2017
    Publication date: July 25, 2019
    Inventors: Ji Woo AHN, Dongwoo KIM, Jaehou NAH, Bumjin CHANG, Yurim CHA, Yeonjoo CHOI, Ilyoung CHOI