Patents Assigned to Nippon Coke & Engineering Company, Limited
  • Patent number: 8329136
    Abstract: The present invention relates to a graphite particle and a carbon-graphite composite particle both suitable for use in electrode for lithium ion secondary battery, as well as to processes for producing these particles. The graphite particle of the present invention has an average particle diameter of 5 to 50 ?m, wherein one or more recesses having a depth of 0.1 to 10 ?m are formed in the surface. The graphite particle is produced by a mixing step for mixing raw material graphite particles and recess-forming particles, a press molding step for press-molding the mixture composed of the raw material graphite particles and the recess-forming particles to obtain a molded article, a pulverization step for pulverizing the molded article, and a separation step for separating and removing the recess-forming particles from the pulverized molded article.
    Type: Grant
    Filed: December 13, 2006
    Date of Patent: December 11, 2012
    Assignee: Nippon Coke & Engineering Company, Limited
    Inventors: Tatsuo Umeno, Takashi Iwao