Patents by Inventor Yasuhiko Bito

Yasuhiko Bito 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: 5474861
    Abstract: An electrode for a non-aqueous electrolyte secondary battery to be embodied in both the anode and cathode. It comprises a mixture including, an active material having reversibility for charging and discharging, and a whisker which is chemically and electrochemically inert. Said active material is a substance capable of reversibly intercalating and deintercalating lithium. Said mixture includes a binding agent and constitutes a solid structural body. Said whisker is at least one selected from the group consisting of silicon carbide whisker, silicon nitride whisker, potassium titanate whisker and aluminum borate whisker.
    Type: Grant
    Filed: January 12, 1994
    Date of Patent: December 12, 1995
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Yasuhiko Bito, Hiroyuki Murai, Masaki Hasegawa, Shuji Ito, Yoshinori Toyoguchi
  • Patent number: 5370948
    Abstract: A process for the production of LiNi.sub.1-x Mn.sub.x O.sub.2 (0.005.ltoreq..times..ltoreq.0.45) as a positive electrode active material for a nonaqueous lithium secondary cell comprising a) mixing aqueous solutions of a lithium salt, a nickel salt and manganese nitrate, b) heating with stirring the solution to dryness and c) pre-calcining from 250.degree. C. to 400.degree. C., grinding and mixing the product and finally calcining from 600.degree. C. to 900.degree. C.
    Type: Grant
    Filed: January 19, 1993
    Date of Patent: December 6, 1994
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Masaki Hasegawa, Hiroyuki Murai, Shuji Ito, Yasuhiko Bito, Yoshinori Toyoguchi
  • Patent number: 5316875
    Abstract: There is provided a secondary battery comprising a positive and a negative electrode and a nonaqueous electrolyte. The positive electrode is made by dipping an electrode comprising a positive active material such as LiMn.sub.2 O.sub.4, LiMnO.sub.2, LiCoO.sub.2, LiNiO.sub.2, LiFeO.sub.2 or .gamma.LiV.sub.2 O.sub.5, in a solution containing butyllithium, phenyllithium, or naphthyllithium. The negative electrode of the battery absorbs and desorbs lithium by charging and discharging, and the nonaqueous electrolyte contains a lithium salt. Also provided is a method of manufacturing a secondary battery comprising a nonaqueous electrolyte. The method comprises the steps of preparing an electrode group containing a positive electrode of LiMn.sub.2 O.sub.4, LiMnO.sub.2, LiCoO.sub.2, LiNiO.sub.2, LiFeO.sub.2 or .gamma.-LiV.sub.2 O.sub.5, as the active material, and a negative electrode which absorbs and desorbs lithium by charging and discharging, with a separator therebetween.
    Type: Grant
    Filed: July 20, 1992
    Date of Patent: May 31, 1994
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Hiroyuki Murai, Yasuhiko Bito, Masaki Hasegawa, Shuji Ito, Yoshinori Toyoguchi
  • Patent number: 5296319
    Abstract: A non-aqueous electrolyte secondary battery comprises rechargeable positive and negative electrodes and a non-aqueous electrolyte. The positive electrode comprises at least one selected from LiCo0.sub.2, LiMn.sub.2 0.sub.4 and LiNi0.sub.2 and the negative electrode consists most of alkai metals such as lithium, etc. The non-aqueous electrolyte contains lithium salts and has concentration ranging from 0.002 to 1.0 mol/liter of at least one acid anhydride selected from acetic anhydride, benzoic anhydride, succinic anhydride, phtalic anhydride and maleic anhydride.
    Type: Grant
    Filed: June 1, 1992
    Date of Patent: March 22, 1994
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Yasuhiko Bito, Masaki Hasegawa, Shuji Ito, Hiroyuki Murai, Yoshinori Toyoguchi
  • Patent number: 5262255
    Abstract: This invention relates to a negative electrode for non-aqueous electrolyte secondary batteries that uses organic electrolyte made form an organic solvent solution of Li salt.More specifically speaking, a highly reliable non-aqueous electrolyte secondary battery is realized by employing a negative electrode of high capacity and excellent cycle characteristics, wherein an active material holder composed of powdered metal, carbon, sulfide, oxide, etc. absorbs Li by charge and desorbes it by discharge or wherein a suitable polymer is used as a binder of the mixture comprising said active material holder and a conductive material. This invention greatly improves capacity and charge and discharge cycle life of not only a coin type cell but also a cylindrical cell, in which a thin and long strip type electrode plate is used and cycle characteristics are more critical.
    Type: Grant
    Filed: January 28, 1992
    Date of Patent: November 16, 1993
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Shuji Ito, Masaki Hasegawa, Hiroyuki Murai, Yasuhiko Bito
  • Patent number: 5229226
    Abstract: A nonaqueous electrolyte secondary battery is disclosed which has a positive and negative electrode and electrolyte, the positive and negative electrode being reversible for charging and discharging, the electrolyte being a nonaqueous one containing alkaline metal ions, and the negative electrode being made of BC.sub.3 or C.sub.5 N, so that the battery is of high energy density and is highly reliable with reasonable voltage.
    Type: Grant
    Filed: June 15, 1992
    Date of Patent: July 20, 1993
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Yasuhiko Bito, Hiroyuki Murai, Masaki Hasegawa, Shuji Ito
  • Patent number: 5194342
    Abstract: A solid-state voltage storage cell is provided which includes a pair of electrodes and a silver-ion conductive solid electrolyte layer disposed therebetween, wherein each of the electrodes is composed of a composition comprising a silver-ion conductive solid electrolyte, a compound oxide of the formula Ag.sub.x V.sub.2 O.sub.5 (0.6.ltoreq.x.ltoreq.0.8) as an electrode active material, and an electron conductive material which is electrochemically inactive with the compound oxide.
    Type: Grant
    Filed: May 29, 1991
    Date of Patent: March 16, 1993
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Yasuhiko Bito, Shuji Ito, Kanji Takata, Shigeko Takahashi, Yoshinori Toyoguchi