Patents by Inventor Noriyuki Yoshinaga
Noriyuki Yoshinaga 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).
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Patent number: 6143213Abstract: The present invention discloses a secondary cell. The secondary cell comprises a positive electrode, a negative electrode which is made of a carbon material, and non-aqueous electrolytic solution, wherein the secondary cell is characterized in that the carbon material as the material of the negative electrode is produced by carbonizing natural high polymers.Type: GrantFiled: August 9, 1993Date of Patent: November 7, 2000Assignee: Sanyo Electric Co., Ltd.Inventors: Nobuhiro Furukawa, Masahisa Fujimoto, Noriyuki Yoshinaga, Koji Ueno
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Patent number: 5993997Abstract: Provided is a novel lithium secondary battery comprising a positive electrode comprising a compound capable of occluding and discharging lithium, a negative electrode composed mainly of a carbon material which comprises a graphite as an only or as a principal component, a separator between said positive electrode and said negative electrode; and an electrolyte solution of an electrolyte solute dissolved in a solvent comprising at least one specific cyclic compound. The lithium secondary battery has a large capacity, small self-discharge rate and excellent cycle characteristics and high charge-discharge efficiency.Type: GrantFiled: March 30, 1998Date of Patent: November 30, 1999Assignee: Sanyo Electric Co., LtdInventors: Masahisa Fujimoto, Noriyuki Yoshinaga, Koji Ueno, Nobuhiro Furukawa, Toshiyuki Nohma, Masatoshi Takahashi
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Patent number: 5882818Abstract: Provided is a novel lithium secondary battery including a positive electrode including a compound capable of occluding and discharging lithium, a negative electrode composed mainly of a carbon material which includes a graphite as an only or as a principal component, a separator between the positive electrode and the negative electrode; and an electrolyte solution of an electrolyte solute dissolved in a solvent including at least one specific cyclic compound.The lithium secondary battery has a large capacity, small self-discharge rate and excellent cycle characteristics and high charge-discharge efficiency.Type: GrantFiled: July 29, 1997Date of Patent: March 16, 1999Assignee: Sanyo Electric Co., Ltd.Inventors: Masahisa Fujimoto, Noriyuki Yoshinaga, Koji Ueno, Nobuhiro Furukawa, Toshiyuki Nohma, Masatoshi Takahashi
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Patent number: 5686138Abstract: Provided is a novel lithium secondary battery including a positive electrode including a compound capable of occluding and discharging lithium, a negative electrode composed mainly of a carbon material which includes a graphite as an only or as a principal component, a separator between the positive electrode and the negative electrode; and an electrolyte solution of an electrolyte solute dissolved in a solvent including at least one specific cyclic compound.The lithium secondary battery has a large capacity, small self-discharge rate and excellent cycle characteristics and high charge-discharge efficiency.Type: GrantFiled: January 24, 1994Date of Patent: November 11, 1997Assignee: Sanyo Electric Co., Ltd.Inventors: Masahisa Fujimoto, Noriyuki Yoshinaga, Koji Ueno, Nobuhiro Furukawa, Toshiyuki Nohma, Masatoshi Takahashi
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Patent number: 5380606Abstract: A secondary battery has a positive electrode principally comprising a lithium-containing complex oxide, a negative electrode principally comprising a carbon material and an organic electrolyte solution, said negative electrode utilizing a mixed binder comprising a polyamic acid and at least one polymer selected from the group consisting of a polyamide resin, polyvinylpyrrolidone and a hydroxyalkylcellulose. The battery has a long cycle life and, at the same time, hardly breaks or bursts even when the battery temperature becomes abnormally high, thereby being highly reliable.Type: GrantFiled: December 28, 1993Date of Patent: January 10, 1995Assignee: Sanyo Electric Co., Ltd.Inventors: Tsukasa Itou, Kazuo Teraji, Noriyuki Yoshinaga, Sunao Harada, Kouji Negoro, Kazunari Mori
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Patent number: 5378561Abstract: The present invention provides a secondary cell with an enlarged capacity, therefore enlarging a discharge capacity as well as improving charge/discharge cycle characteristics. The secondary cell has a carbon material for a negative electrode, wherein the spacing of (002) planes d.sub.002, a true density, a crystallite size in the direction of c axis Lc, a and specific surface area of the carbon material are restricted to ranges of 3.39.ANG. to 3.62.ANG., 1.70 g/cc to 2.20 g/cc, 10.ANG. to 50.ANG., and 2 m.sup.2 /g to 50 m.sup.2, respectively. The carbon material is selected from a carbon material group consisting of needle cokes, pitch cokes, and coke derived from furfuryl alcohol.Type: GrantFiled: September 1, 1992Date of Patent: January 3, 1995Assignee: Sanyo Electric Co., Ltd.Inventors: Nobuhiro Furukawa, Masahisa Fujimoto, Noriyuki Yoshinaga, Koji Ueno
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Patent number: 5358805Abstract: A secondary battery is comprised at a positive electrode, an electrolyte and a negative electrode which intercalates lithium reversibly. The negative electrode uses a carbon compound having a crystal structure of graphite in which carbon (C) is partially replaced by both boron (B) and nitrogen (N) and has the formula BC.sub.3 N or in which (C) is partially replaced by boron (B) and has the formula BC.sub.3. In the battery, the positive electrode may be a metal chalcogen or metal oxide, such as FeS.sub.2, MoS.sub.2, TiS.sub.2, LiNiO.sub.2, LiMn.sub.2 O.sub.3, LiFeO.sub.2 LiCoO.sub.2 or MnO.sub.2. The electrolyte may be a nonaqueous electrolyte or a solid electrolyte. The non-aqueous electrolyte uses an organic solvent and a lithium salt.Type: GrantFiled: February 23, 1993Date of Patent: October 25, 1994Assignee: Sanyo Electric Co., Ltd.Inventors: Masahisa Fujimoto, Noriyuki Yoshinaga, Koji Ueno, Kazuro Moriwaki, Koji Nishio
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Patent number: 4840858Abstract: A rechargeable secondary cell having the following as main components: a positive electrode formed of a conductive polymer, a negative electrode, a separator disposed between the positive and negative electrodes, an electrolyte comprising a mixed solvent of .gamma.-butyrolactone and a cyclic carbonic ester compound or ethylene carbonate, each being expressed by the following chemical formula. ##STR1## (where R.sup.1 is a lower alkyl group having 1-3 carbon atoms and R.sup.2 is a hydrogen atom or a methyl group, R.sup.2 being a hydrogen atom, and R.sup.1 being a group other than the methyl group.Type: GrantFiled: June 13, 1988Date of Patent: June 20, 1989Assignee: Sanyo Electric Co., Ltd.Inventors: Nobuhiro Furukawa, Koji Nishio, Noriyuki Yoshinaga
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Patent number: 4731311Abstract: An electrically conductive material containing no substantial amount of water and prepared by polymerizing, in the presence of an oxidizing agent, a compound having conjugated double bonds on a base material in a gas phase. The base material has spaces capable of retaining the oxidizing agent. The electrically conductive material is used for at least one electrode of a secondary battery.Type: GrantFiled: October 9, 1986Date of Patent: March 15, 1988Assignees: Sanyo Electric Co., Ltd., Mitsubishi Chemical Industries LimitedInventors: Tetsumi Suzuki, Kazumi Hasegawa, Nobuhiro Furukawa, Koji Nishio, Masahisa Fujimoto, Noriyuki Yoshinaga