Patents by Inventor Jun Seyama

Jun Seyama 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).

  • Positive electrode active material for nonaqueous electrolyte secondary battery and nonaqueous electrolyte secondary battery
    Patent number: 7851088
    Abstract: Disclosed is a positive electrode active material for a nonaqueous electrolyte secondary battery having at least a lithium-transition metal composite oxide of a layer structure, in which an existence ratio of at least one selected from the group consisting of elements which may become tetravalent and magnesium is 20% or more on a surface of the lithium-transition metal composite oxide. By use of this positive electrode active material, a nonaqueous electrolyte secondary battery having excellent battery characteristics, specifically, having excellent high rate characteristics, cycle characteristics, low-temperature characteristics, thermal stability, and the like, under the even more harsh environment for use can be realized.
    Type: Grant
    Filed: March 23, 2004
    Date of Patent: December 14, 2010
    Assignee: Nichia Corporation
    Inventors: Takeshi Takahashi, Takeshi Oba, Kenji Fujino, Junichi Tokuno, Masuhiro Morizaki, Takeyuki Kondo, Jun Seyama
  • Positive electrode active material for nonaqueous electrolyte secondary battery and nonaqueous electrolyte secondary battery
    Publication number: 20040229123
    Abstract: Disclosed is a positive electrode active material for a nonaqueous electrolyte secondary battery having at least a lithium-transition metal composite oxide of a layer structure, in which an existence ratio of at least one selected from the group consisting of elements which may become tetravalent and magnesium is 20% or more on a surface of the lithium-transition metal composite oxide. By use of this positive electrode active material, a nonaqueous electrolyte secondary battery having excellent battery characteristics, specifically, having excellent high rate characteristics, cycle characteristics, low-temperature characteristics, thermal stability, and the like, under the even more harsh environment for use can be realized.
    Type: Application
    Filed: March 23, 2004
    Publication date: November 18, 2004
    Applicant: NICHIA CORPORATION
    Inventors: Takeshi Takahashi, Takeshi Oba, Kenji Fujino, Junichi Tokuno, Masuhiro Morizaki, Takeyuki Kondo, Jun Seyama