Patents by Inventor Koichi Chikayama

Koichi Chikayama 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).

  • Non-aqueous electrolyte lithium secondary battery
    Patent number: 6274271
    Abstract: A non-aqueous electrolyte lithium secondary battery comprising a negative electrode of spinel-type lithium-titanium oxide with improved overcharge and overdischarge characteristics is disclosed. In this battery, the rechargeable electric capacity of the negative electrode is adjusted to be smaller than that of the positive electrode. In a preferable mode, the negative electrode may further comprise a material which has more negative potential than that of the lithium-titanium oxide, and shows electrochemical reversibility. An electrolyte comprising ethylene carbonate and LiN(CF3SO2)2 or LiN(C2F5SO2)2 is preferable.
    Type: Grant
    Filed: August 21, 1997
    Date of Patent: August 14, 2001
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Nobuharu Koshiba, Emi Asaka, Koichi Chikayama, Yoko Sano