Patents by Inventor Fusaji Kita
Fusaji Kita 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: 11050095Abstract: An electrochemical device having excellent safety at high temperature is provided by using a separator for an electrochemical device, which is made of a porous film comprising: a porous base (5) having a heat-resistant temperature of 150° C. or higher and including filler particles (3); at least one kind of shutdown resin (6) selected from the group consisting of resin A that has a melting point in a range of 80° C. to 130° C. and resin B that absorbs an electrolyte and swells due to heating, and the swelling degree is increased as the temperature rises; and a binder (4).Type: GrantFiled: December 8, 2005Date of Patent: June 29, 2021Assignee: Maxell Holdings, Ltd.Inventors: Hideaki Katayama, Toshihiro Abe, Nobuaki Matsumoto, Fusaji Kita, Shigeo Aoyama
-
Patent number: 10044072Abstract: A lithium secondary battery pack of the present invention includes: a lithium secondary battery including an electrode body formed of a positive electrode and a negative electrode facing each other and a separator interposed therebetween, and a non-aqueous electrolyte; a PTC element; and a protection circuit including a field effect transistor. The lithium secondary battery has an energy density per volume of 450 Wh/L or more, the lithium secondary battery has a current density of 3.0 mA/cm2 or less, and a relational expression (1) and a relational expression (2) below are established where A (m?) is an impedance of the lithium secondary battery and B (m?) is an impedance of the entire circuit unit of the lithium secondary battery pack excepting the impedance A (m?) of the lithium secondary battery: A?50 m???(1) B/A?1??(2).Type: GrantFiled: February 25, 2014Date of Patent: August 7, 2018Assignee: MAXELL HOLDINGS, LTD.Inventors: Haruki Kamizori, Masayuki Yamada, Fusaji Kita
-
Patent number: 9350019Abstract: A nonaqueous secondary battery having a positive electrode having a positive electrode mixture layer, a negative electrode, and a nonaqueous electrolyte, in which the positive electrode contains, as an active material, a lithium-containing transition metal oxide containing a metal element selected from the group consisting of Mg, Ti, Zr, Ge, Nb, Al and Sn, the positive electrode mixture layer has a density of 3.5 g/cm3 or larger, and the nonaqueous electrolyte contains a compound having two or more nitrile groups in the molecule.Type: GrantFiled: February 25, 2014Date of Patent: May 24, 2016Assignee: HITACHI MAXELL, LTD.Inventors: Hideo Sakata, Fusaji Kita, Kumiko Ishizuka
-
Publication number: 20160020494Abstract: A lithium secondary battery pack of the present invention includes: a lithium secondary battery including an electrode body formed of a positive electrode and a negative electrode facing each other and a separator interposed therebetween, and a non-aqueous electrolyte; a PTC element; and a protection circuit including a field effect transistor. The lithium secondary battery has an energy density per volume of 450 Wh/L or more, the lithium secondary battery has a current density of 3.0 mA/cm2 or less, and a relational expression (1) and a relational expression (2) below are established where A (m?) is an impedance of the lithium secondary battery and B (m?) is an impedance of the entire circuit unit of the lithium secondary battery pack excepting the impedance A (m?) of the lithium secondary battery: A?50 m???(1) B/A?1??(2).Type: ApplicationFiled: February 25, 2014Publication date: January 21, 2016Applicant: HITACHI MAXELL, LTD.Inventors: Haruki KAMIZORI, Masayuki YAMADA, Fusaji KITA
-
Patent number: 9077035Abstract: A nonaqueous secondary battery containing a positive electrode having a positive electrode mixture layer, a negative electrode, and a nonaqueous electrolyte, wherein the positive electrode comprises, as active materials, two or more lithium-containing transition metal oxides having different average particle sizes, and the lithium-containing transition metal oxide having the smallest average particle size contains one or more of Mg, Ti, Zr, Ge, Nb, Al and Sn.Type: GrantFiled: March 16, 2007Date of Patent: July 7, 2015Assignee: HITACHI MAXELL, LTD.Inventors: Fusaji Kita, Hideki Tsubata, Hiroyasu Inoue
-
Patent number: 8877385Abstract: The non-aqueous secondary battery of the present invention includes a positive electrode, a negative electrode, a non-aqueous electrolyte and a separator. The positive electrode includes a positive electrode mixture layer containing a positive electrode active material, a conductive polymer, an organic silane compound, a conductive assistant and a binder, the conductive polymer is polythiophene or a derivative thereof, and the content of the conductive polymer is 0.05 to 0.5 mass % with respect to the total mass of the positive electrode mixture layer.Type: GrantFiled: November 2, 2011Date of Patent: November 4, 2014Assignee: Hitachi, Ltd.Inventors: Hirokazu Kamine, Mitsuhiro Kishimi, Fusaji Kita
-
Publication number: 20140227562Abstract: A lithium secondary-battery pack of the present invention includes: a lithium secondary battery including an electrode body and a non-aqueous electrolyte, the electrode body including a positive electrode and a negative electrode facing each other, and a separator interposed therebetween; a PTC (Positive Temperature Coefficient) element; and a protection circuit including a field-effect transistor, wherein the negative electrode includes a negative electrode material mixture layer containing a Si-containing material as a negative electrode active material, and, where Z represents an impedance (?) of the lithium secondary-battery pack and Q represents a capacity (Ah) of the lithium secondary-battery pack, an impedance capacity index represented by Z/Q is 0.055 ?/Ah or less.Type: ApplicationFiled: September 3, 2012Publication date: August 14, 2014Applicant: HITACHI MAXELL, LTD.Inventors: Haruki Kamizori, Itaru Gosho, Masayuki Yamada, Fusaji Kita
-
Publication number: 20140227589Abstract: A polymer of the present invention has a plurality of pendant groups. Each of the pendant groups is constituted of a carboxyl group or a salt thereof, and a group interposed between a main chain and either the carboxyl group or salt thereof. The group interposed between the main chain and either the carboxyl group or salt thereof is: a hydrocarbon group; a perfluorocarbon group; constituted of a hydrocarbon group and at least one of an ester group and a carbonate group; or constituted of a perfluorocarbon group and at least one of an ester group and a carbonate group. A carbonyl carbon included in the carboxyl group or salt thereof is bonded directly to a carbon included in either the hydrocarbon group or the perfluorocarbon group.Type: ApplicationFiled: November 28, 2012Publication date: August 14, 2014Inventors: Kenji Kono, Naoki Usuki, Hidetoshi Morikami, Hisao Kanzaki, Fusaji Kita
-
Patent number: 8795884Abstract: In the nonaqueous secondary battery of the present invention, a positive electrode mixture layer included in a positive electrode contains a lithium-containing complex oxide defined by the general formula LixM1yM2zM3vO2 (where, M1 represents at least one transition metal element selected from the group consisting of Co, Ni and Mn, M2 represents at least one metal element selected from the group consisting of Mg, Ti, Zr, Ge, Nb, Al and Sn, M3 represents an element other than Li, M1 and M2, 0.97?x<1.02, 0.8?y<1.02, 0.002?z?0.05, and 0?v?0.05) and has a density of 3.5 g/cm3 or more. A nonaqueous electrolyte contains a fluorinated nitrile compound including two or more cyano groups or a cyano group and an ester group.Type: GrantFiled: April 30, 2009Date of Patent: August 5, 2014Assignees: Hitachi Maxell, Ltd., Kanto Denka Kogyo Co., Ltd.Inventors: Hideo Sakata, Fusaji Kita, Kumiko Ishizuka, Akiko Kuwabara, Yuan Gao
-
Publication number: 20140178757Abstract: A nonaqueous secondary battery having a positive electrode having a positive electrode mixture layer, a negative electrode, and a nonaqueous electrolyte, in which the positive electrode contains, as an active material, a lithium-containing transition metal oxide containing a metal element selected from the group consisting of Mg, Ti, Zr, Ge, Nb, Al and Sn, the positive electrode mixture layer has a density of 3.Type: ApplicationFiled: February 25, 2014Publication date: June 26, 2014Applicant: Hitachi Maxell, Ltd.Inventors: Hideo SAKATA, Fusaji KITA, Kumiko ISHIZUKA
-
Patent number: 8691446Abstract: A nonaqueous secondary battery having a positive electrode having a positive electrode mixture layer, a negative electrode, and a nonaqueous electrolyte, in which the positive electrode contains, as an active material, a lithium-containing transition metal oxide containing a metal element selected from the group consisting of Mg, Ti, Zr, Ge, Nb, Al and Sn, the positive electrode mixture layer has a density of 3.5 g/cm3 or larger, and the nonaqueous electrolyte contains a compound having two or more nitrile groups in the molecule.Type: GrantFiled: October 25, 2007Date of Patent: April 8, 2014Assignee: Hitachi Maxell, Ltd.Inventors: Hideo Sakata, Fusaji Kita, Kumiko Ishizuka
-
Patent number: 8637177Abstract: The electrochemical device of the present invention comprises a positive electrode (2), a negative electrode (1), a nonaqueous electrolyte and a separator (3). The separator (3) includes a porous layer (I) composed of a microporous film composed predominantly of a thermoplastic resin and a porous layer (II) containing a filler having a heat-resistant temperature of 150° C. or higher as the main component. The negative electrode (1) contains graphite having an R value of 0.1 to 0.5 and d002 of 0.338 nm or less as a negative electrode active material, where the R value is a ratio of a peak intensity at 1360 cm?1 to a peak intensity at 1580 cm?1 in an argon ion laser Raman spectrum and the d002 is a lattice spacing between 002 planes. The ratio of the graphite to the negative electrode active material is 30 mass % or more, and the nonaqueous electrolyte contains vinyl ethylene carbonate or a derivative thereof, or a dinitrile compound or acid anhydride.Type: GrantFiled: March 12, 2010Date of Patent: January 28, 2014Assignee: Hitachi Maxell, Ltd.Inventors: Hirokazu Nomura, Akira Yamashita, Fusaji Kita
-
Publication number: 20130252095Abstract: The non-aqueous secondary battery of the present invention includes a positive electrode, a negative electrode, a non-aqueous electrolyte and a separator. The positive electrode includes a positive electrode mixture layer containing a positive electrode active material, a conductive polymer, an organic silane compound, a conductive assistant and a binder, the conductive polymer is polythiophene or a derivative thereof, and the content of the conductive polymer is 0.05 to 0.5 mass % with respect to the total mass of the positive electrode mixture layer.Type: ApplicationFiled: November 2, 2011Publication date: September 26, 2013Applicant: HITACHI, LTD.Inventors: Hirokazu Kamine, Mitsuhiro Kishimi, Fusaji Kita
-
Publication number: 20130230770Abstract: A non-aqueous secondary battery of the present invention includes a positive electrode, a negative electrode, a separator and a non-aqueous electrolyte. The positive electrode includes a lithium-containing composite oxide as a positive electrode active material, expressed by a general compositional formula (1): Li1+yMO2 where ?0.5?y?0.5. M denotes an element group including Ni and at least one element selected from the group consisting of Co, Mn, Fe and Ti. And the non-aqueous electrolyte includes a cycloalkane derivative A having at least one alkyl ether group containing an unsaturated bond, and at least one compound selected from the group consisting of an azacrown ether compound B having a functional group where at least one of nitrogen atoms contains an unsaturated bond and a nitrogen-containing heterocyclic compound C.Type: ApplicationFiled: November 15, 2011Publication date: September 5, 2013Applicant: HITACHI MAXELL, LTD.Inventors: Masayuki Oya, Mitsuhiro Kishimi, Fusaji Kita
-
Patent number: 8415058Abstract: A nonaqueous secondary battery having a positive electrode having a positive electrode mixture layer, a negative electrode, and a nonaqueous electrolyte, in which the positive electrode contains, as an active material, a lithium-containing transition metal oxide containing a metal element selected from the group consisting of Mg, Ti, Zr, Ge, Nb, Al and Sn, the positive electrode mixture layer has a density of 3.Type: GrantFiled: June 12, 2012Date of Patent: April 9, 2013Assignee: Hitachi Maxell, Ltd.Inventors: Hideo Sakata, Fusaji Kita, Kumiko Ishizuka
-
Publication number: 20130071758Abstract: The nonaqueous electrolyte for an electrochemical device of the present invention includes at least one selected from an imide compound represented by the general formula (1) and an imide compound represented by the general formula (2): where R1 is an organic residue or an F-containing organic residue, X1 and X2 are each H, F, an organic residue or an F-containing organic residue, and X1 and X2 may be the same or different from each other; and where R2 is an organic residue or an F-containing organic residue, and H of a benzene ring may be partially or entirely replaced with F.Type: ApplicationFiled: September 13, 2012Publication date: March 21, 2013Applicant: HITACHI MAXELL ENERGY, LTD.Inventors: Masayuki OYA, Mitsuhiro KISHIMI, Fusaji KITA
-
Publication number: 20120301784Abstract: The nonaqueous secondary battery of the present invention comprises a positive electrode having a positive electrode mixture layer containing a lithium-containing composite oxide as a positive electrode active material, a negative electrode, a separator, and a nonaqueous electrolyte. The surface of the positive electrode active material or the positive electrode mixture layer is coated with polyvalent organic metal salt, particularly preferably with fluorine-containing polyvalent organic lithium salt.Type: ApplicationFiled: May 23, 2012Publication date: November 29, 2012Inventors: Akira YANO, Yuji SASAKI, Katsunori KOJIMA, Fusaji KITA
-
Publication number: 20120251893Abstract: A nonaqueous secondary battery having a positive electrode having a positive electrode mixture layer, a negative electrode, and a nonaqueous electrolyte, in which the positive electrode contains, as an active material, a lithium-containing transition metal oxide containing a metal element selected from the group consisting of Mg, Ti, Zr, Ge, Nb, Al and Sn, the positive electrode mixture layer has a density of 3.Type: ApplicationFiled: June 12, 2012Publication date: October 4, 2012Inventors: Hideo SAKATA, Fusaji Kita, Kumiko Ishizuka
-
Patent number: 8137840Abstract: A nonaqueous secondary battery containing a positive electrode having a positive electrode mixture layer, a negative electrode, and a nonaqueous electrolyte, in which the positive electrode comprises, as active materials, three or more lithium-containing transition metal oxides having different average particle sizes, those transition metal oxides comprise a transition metal element, the transition metal element of the transition metal oxide having the smallest average particle size is partially substituted with a metal element other than the transition metal element, and the density of the positive electrode mixture layer is t 3.8 g/cm3 or more.Type: GrantFiled: March 27, 2007Date of Patent: March 20, 2012Assignee: Hitachi Maxell Energy, Ltd.Inventors: Fusaji Kita, Hideki Tsubata, Hiroyasu Inoue
-
Patent number: RE49407Abstract: A lithium secondary battery pack of the present invention includes: a lithium secondary battery including an electrode body formed of a positive electrode and a negative electrode facing each other and a separator interposed therebetween, and a non-aqueous electrolyte; a PTC element; and a protection circuit including a field effect transistor. The lithium secondary battery has an energy density per volume of 450 Wh/L or more, the lithium secondary battery has a current density of 3.0 mA/cm2 or less, and a relational expression (1) and a relational expression (2) below are established where A (m?) is an impedance of the lithium secondary battery and B (m?) is an impedance of the entire circuit unit of the lithium secondary battery pack excepting the impedance A (m?) of the lithium secondary battery: A?50 m???(1) B/A?1??(2).Type: GrantFiled: August 6, 2020Date of Patent: January 31, 2023Assignee: Maxell, Ltd.Inventors: Haruki Kamizori, Masayuki Yamada, Fusaji Kita