Patents by Inventor Haruo Sakagoshi

Haruo Sakagoshi 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: 20060073387
    Abstract: A lithium secondary battery includes a positive electrode, a negative electrode and nonaqueous electrolyte, wherein the negative electrode includes a negative active material and a binder, the negative active material comprises graphite A and graphite B, shapes of primary particles of the graphite A are spherical or elliptical, an average particle diameter of the primary particles of the graphite A ranges between 10 ?m and 30 ?m inclusive, sizes of crystallites of the graphite A in a direction of a c-axis are smaller than 100 nm and tap density of the graphite A is 1.0 g/cm3 or higher, shapes of primary particles of the graphite B are flat, an average particle diameter of the primary particles of the graphite B ranges between 1 ?m and 10 ?m inclusive, and sizes of crystallites of the graphite B in a direction of a c-axis are 100 nm or larger, which has a large capacity and excellent cycle characteristics.
    Type: Application
    Filed: January 21, 2004
    Publication date: April 6, 2006
    Applicant: Hitachi Maxell, Ltd.
    Inventors: Haruo Sakagoshi, Masuhiro Onishi, Hyo Azuma, Seiji Ishizawa, Fumio Togawa, Shuichi Wada