Patents by Inventor Masahisa Fujimoto

Masahisa Fujimoto 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).

  • Electrolyte for nanaqueous battery, method for producing the same, and electrolytic solution for nonaqueous battery
    Publication number: 20040137324
    Abstract: An electrolyte for a nonaqueous battery according to the present invention consists essentially of magnesium bistrifluoromethanesulfonimide. An electrolytic solution for a nonaqueous battery according to the present invention includes the magnesium bistrifluoromethanesulfonimide, and an organic solvent such as a cyclic carbonate, a chain carbonate, a cyclic ether and a chain ether or an ordinary temperature molten salt having a melting point of 60° C. or less in which the magnesium bistrifluoromethanesulfonimide is dissolved.
    Type: Application
    Filed: December 24, 2003
    Publication date: July 15, 2004
    Inventors: Masaharu Itaya, Masahide Miyake, Masahisa Fujimoto, Hideyuki Koga, Kazunori Donoue
  • Electrolyte for a nonaqueous battery
    Publication number: 20040131933
    Abstract: An electrolyte containing calcium bistrifluoromethanesulfonimide [Ca((CF3SO2)2N)2] for a nonaqueous battery. The calcium bistrifluoromethanesulfonimide is soluble in an organic solvent and a molten salt having a melting point of not greater than 60° C.
    Type: Application
    Filed: December 18, 2003
    Publication date: July 8, 2004
    Inventors: Masaharu Itaya, Masahide Miyake, Masahisa Fujimoto
  • Electrode for lithium secondary battery and lithium secondary battery
    Patent number: 6746801
    Abstract: An electrode for a lithium secondary battery in which an alloy thin film containing Sn (tin) and In (indium) is formed on the surface of a current collector having a surface roughness Ra of 0.1 &mgr;m or more, and a lithium secondary battery using thereof.
    Type: Grant
    Filed: November 13, 2001
    Date of Patent: June 8, 2004
    Assignee: Sanyo Electric Co., Ltd.
    Inventors: Noriyuki Tamura, Daizo Jito, Ryuji Ohshita, Masahisa Fujimoto, Maruo Kamino, Shin Fujitani
  • Positive electrode active material for secondary battery and secondary battery
    Patent number: 6713214
    Abstract: A secondary battery is characterized by using an organic material including carbon having a conjugate electron cloud and coupled with an electron attractive group; or a material obtained by baking a fluorocarbon polymer or graphite fluoride in an inert atmosphere at a temperature in the range of from the decomposition start temperature to 1000° C., as a positive electrode active material for the secondary battery.
    Type: Grant
    Filed: November 9, 2001
    Date of Patent: March 30, 2004
    Assignee: Sanyo Electric Co., Ltd.
    Inventors: Hideyuki Koga, Masahisa Fujimoto, Shin Fujitani
  • Rechargeable battery
    Publication number: 20040058245
    Abstract: A rechargeable battery includes electrodes containing particles of an active material capable of being alloyed with Li. A metallic element that is not alloyed with Li is distributed by its diffusion in particles of the active material.
    Type: Application
    Filed: June 20, 2003
    Publication date: March 25, 2004
    Inventors: Masahisa Fujimoto, Yasuyuki Kusumoto, Masahide Miyake, Shin Fujitani
  • Rechargeable battery using nonaqeous electorlyte
    Publication number: 20040048161
    Abstract: A nonaqueous electrolyte rechargeable battery using molybdenum oxide in the form of thin film deposited on an aluminum-containing substrate, as a positive electrode material.
    Type: Application
    Filed: December 23, 2002
    Publication date: March 11, 2004
    Inventors: Takuya Sunagawa, Hiroaki Ikeda, Yoichi Domoto, Masahisa Fujimoto, Ryuji Ohshita, Masaki Shima, Hiromasa Yagi, Hisaki Tarui, Shin Fujitani
  • Negative electrode for lithium secondary cell and method for producing the same
    Publication number: 20040043294
    Abstract: A negative electrode for a lithium secondary cell, characterized in that it is prepared by a method comprising providing a conductive metal of foil having a surface roughness of 0.2 &mgr;m or more as a collector and a mixture of active material particles containing silicon and/or a silicon alloy with a conductive metal powder and sintering the mixture on the surface of the collector; and a lithium secondary cell comprising the negative electrode.
    Type: Application
    Filed: February 28, 2003
    Publication date: March 4, 2004
    Inventors: Atsushi Fukui, Takuya Hashimoto, Yasuyuki Kusumoto, Hiroshi Nakamura, Masahisa Fujimoto, Shin Fujitani
  • Electrode active material and lithium secondary battery
    Patent number: 6692870
    Abstract: The present invention provides an improved electrode material for a lithium secondary battery to provide a lithium secondary battery that is light in weight and has high energy density. Sulfur and a catalyst material such as active carbon, and the like, that reduces activation energy of an addition reaction of lithium to sulfur and allows the reaction to occur at not greater than 60° C., are included in the electrode material.
    Type: Grant
    Filed: April 24, 2001
    Date of Patent: February 17, 2004
    Assignee: Sanyo Electric Co., Ltd.
    Inventors: Masahide Miyake, Masahisa Fujimoto, Shin Fujitani
  • Non-aqueous electrolyte battery
    Publication number: 20040029007
    Abstract: In a non-aqueous electrolyte battery provided with a positive electrode, a negative electrode, and a non-aqueous electrolyte using an organic solvent, at least one type of ferrite, FeS2, and a transition metal oxide (except for LiCoO2) having crystal structure of space group R3m is used as a positive electrode material for a positive electrode, and a negative electrode material containing lithium is used for a negative electrode.
    Type: Application
    Filed: August 4, 2003
    Publication date: February 12, 2004
    Applicant: SANYO ELECTRIC CO., LTD.
    Inventors: Yasuyuki Kusumoto, Masahisa Fujimoto, Shin Fujitani, Masahide Miyake
  • Electrode for lithium secondary cell and lithium secondary cell
    Publication number: 20040023111
    Abstract: An electrode for lithium secondary battery having a current collector and, deposited thereon, a thin film comprising silicon as a main component, characterized in that the thin film comprising silicon contains at least one of the elements belonging to the groups IIIa, Iva, Va, VIa, VIIa, VIII, Ib and IIb in the fourth, fifth and sixth periods of the Periodic Table (exclusive of copper (Cu)) at least in the surface portion thereof.
    Type: Application
    Filed: April 11, 2003
    Publication date: February 5, 2004
    Inventors: Ryuji Ohshita, Taeko Ota, Maruo Kamino, Hisaki Tarui, Masahisa Fujimoto, Shin Fujitani, Katsunobu Sayama
  • Method for fabricating electrode for rechargeable lithium battery
    Patent number: 6685804
    Abstract: A method for fabricating an electrode for a rechargeable lithium battery which includes depositing a thin film composed of active material capable of alloy formation with lithium on a current collector made of a metal incapable of alloy formation with lithium, by using a process for depositing a thin film by supplying a material from a gas phase, characterized in that the thin film of active material is deposited at such a temperature that enables formation of a mixed layer via diffusion of a constituent of the current collector into the thin film in the vicinity of an interface therebetween.
    Type: Grant
    Filed: April 19, 2002
    Date of Patent: February 3, 2004
    Assignee: Sanyo Electric Co., Ltd.
    Inventors: Hiroaki Ikeda, Yoichi Domoto, Hiromasa Yagi, Hisaki Tarui, Masahisa Fujimoto, Shin Fujitani, Masaki Shima
  • Electrode for lithium secondary cell and lithium secondary cell
    Publication number: 20030180619
    Abstract: An electrode having a current collector and, formed thereon, a thin film comprising an active material, characterized in that a thin alloy film (such as Sn—Co) comprising a metal which can form an alloy with lithium (such as Sn) and a metal which can not form an alloy with lithium (such as Co) is formed on a current collector such as a copper foil. It is preferred that the above metal which can form an alloy with lithium and the above metal which can not form an alloy with lithium can not form an intermetallic compound with each other.
    Type: Application
    Filed: March 19, 2003
    Publication date: September 25, 2003
    Inventors: Noriyuki Tamura, Shiori Nakamizo, Daizo Jito, Ryuji Ohshita, Masahisa Fujimoto, Shin Fujitani, Maruo Kamino
  • Lithium secondary battery
    Patent number: 6613477
    Abstract: The present invention provides a lithium secondary battery having great capacity density per volume and weight. The lithium secondary battery contains a positive electrode having Li—Bi alloy or Li—Sb alloy as a positive electrode active material, a negative electrode and a non-aqueous electrolyte.
    Type: Grant
    Filed: February 21, 2001
    Date of Patent: September 2, 2003
    Assignee: Sanyo Electric Co., Ltd.
    Inventors: Yasuyuki Kusumoto, Masahisa Fujimoto, Hiroaki Ikeda, Shin Fujitani
  • Lithium secondary battery-use electrode and lithium secondary battery
    Publication number: 20030108795
    Abstract: A lithium secondary battery-use electrode and a lithium secondary battery, which are high in discharge capacity and excellent in cycle characteristics, characterized in that a layer consisting of a metal alloying with Li is provided on a substrate consisting of a metal not alloying with Li, and a layer having these metals mixed therein is formed between the above layer and the substrate.
    Type: Application
    Filed: October 24, 2002
    Publication date: June 12, 2003
    Inventors: Noriyuki Tamura, Shiori Nakamizo, Daizo Jito, Ryuji Ohshita, Masahisa Fujimoto, Shin Fujitani, Maruo Kamino
  • Non aqueous electrolyte secondary battery
    Publication number: 20030096163
    Abstract: A non aqueous electrolyte secondary battery comprises a positive electrode made from a material which is capable of occluding and discharging anions, a negative electrode made from a material which is capable of occluding and discharging cations, and a non aqueous electrolyte containing a room temperature molten salt having a melting point of not greater than 60° C.
    Type: Application
    Filed: October 28, 2002
    Publication date: May 22, 2003
    Inventors: Masahide Miyake, Masahisa Fujimoto, Hideyuki Koga, Hisaki Tarui, Shin Fujitani, Yoshinori Kida
  • Lithium secondary battery
    Publication number: 20030054252
    Abstract: The present invention provides a lithium secondary battery having great capacity density per volume and weight. The lithium secondary battery contains a positive electrode having Li—Bi alloy or Li—Sb alloy as a positive electrode active material, a negative electrode and a non-aqueous electrolyte.
    Type: Application
    Filed: February 21, 2001
    Publication date: March 20, 2003
    Inventors: Yasuyuki Kusumoto, Masahisa Fujimoto, Hiroaki Ikeda, Shin Fujitani
  • Lithium battery
    Patent number: 6528212
    Abstract: A lithium battery of the invention includes a positive electrode, a negative electrode with a negative electrode current collector retaining lithium metal, and a nonaqueous electrolyte, wherein an activated carbon or graphitized carbon is used as the negative electrode current collector.
    Type: Grant
    Filed: September 11, 2000
    Date of Patent: March 4, 2003
    Assignee: Sanyo Electric Co., Ltd.
    Inventors: Yasuyuki Kusumoto, Masahisa Fujimoto
  • Lithium secondary battery
    Patent number: 6492063
    Abstract: In a lithium secondary battery of this invention, the negative electrode uses, as an active material, an alloy including an A phase of a first intermetallic compound (A), and a B phase of a second intermetallic compound (B) having the same constituent elements as and a different composition from the first intermetallic compound (A) and/or a C phase consisting of one of the constituent elements of the first intermetallic compound (A), and at least one of the A phase, the B phase and the C phase is capable of electrochemically absorbing and discharging lithium ions. Thus, the lithium secondary battery can exhibit good charge-discharge cycle performance.
    Type: Grant
    Filed: October 12, 2000
    Date of Patent: December 10, 2002
    Assignee: Sanyo Electric Co., Ltd.
    Inventors: Hiroaki Ikeda, Masahisa Fujimoto, Shin Fujitani, Takuya Hashimoto, Yasuhiko Itoh, Ikuo Yonezu
  • Lithium secondary battery and positive electrode for lithium secondary battery
    Publication number: 20020168571
    Abstract: A lithium secondary battery comprises a negative electrode containing lithium metal or a material previously storing lithium as an active material, a positive electrode containing a positive active material, and an electrolyte containing a non-aqueous electrolyte solution. The positive active material is a thin film formed by depositing on a substrate from vapor phase or liquid phase and including an oxide containing at least iron as a main constituent by a sputtering method, a reactive deposition method, a vacuum deposition method, a chemical vapor deposition method, a spraying method, a plating method, or a method in combination of these methods.
    Type: Application
    Filed: January 28, 2002
    Publication date: November 14, 2002
    Inventors: Yasuyuki Kusumoto, Masahisa Fujimoto, Shin Fujitani, Yoichi Domoto, Daizo Jito, Hisaki Tarui
  • Lithium secondary cell with a stannous electrode material
    Patent number: 6465131
    Abstract: A lithium secondary cell having incorporated therein a positive electrode or negative electrode active substance which is a compound sulfide having substantially the same crystal structure as stannous sulfide (SnS) or a lithium-containing compound sulfide comprising said compound sulfide and lithium contained therein, said compound sulfide comprising at least one transition metal selected from among copper (Cu), vanadium (V), chromium (Cr), manganese (Mn), iron (Fe), cobalt (Co) and nickel (Ni), tin and sulfur. This stabilizes the crystal structure of SnS serving as the active substance, giving the cell practically useful charge-discharge cycle characteristics.
    Type: Grant
    Filed: June 6, 2000
    Date of Patent: October 15, 2002
    Assignee: Sanyo Electric Co., Ltd.
    Inventors: Yasuyuki Kusumoto, Masahisa Fujimoto, Shin Fujitani