Patents by Inventor Tetsuya Mitsumoto
Tetsuya Mitsumoto 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: 10141570Abstract: The present invention relates to a positive electrode active material including a lithium metal composite oxide having a layer crystal structure, and provides a novel positive electrode active material for a lithium secondary cell, which can suppress the reaction with an electrolyte solution and can raise the charge-discharge cycle ability of the cell, and can make good the output characteristics of the cell.Type: GrantFiled: September 3, 2015Date of Patent: November 27, 2018Assignee: Mitsui Mining & Smelting Co., Ltd.Inventors: Daisuke Washida, Toshikazu Matsuyama, Tetsuya Mitsumoto, Daisuke Inoue, Hideaki Matsushima, Yoshimi Hata, Hitohiko Ide, Shinya Kagei
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Publication number: 20180261841Abstract: Relating to a 5 V-class spinel type lithium nickel manganese-containing composite oxide having an operating potential of 4.5 V or more with respect to a Li metal reference potential, the present invention proposes a composite oxide being capable of improving cycle properties while suppressing the amount of gas generation under high temperature environments and of increasing thermodynamical stability of a positive electrode in a fully charged state. Proposed is a spinel type lithium nickel manganese-containing composite oxide represented by a general formula [Li(LiaNiyMn2-a-b-y-z-?TibAlzM?)O4-?](where 0<a, 0<b, 0.30?y<0.60, 0<z, 0??, 2-a-b-y-z-?<1.7, 3?b/a?8, 0.1<b+z+?, 0<z/b?1, and M represents one or two or more metal elements selected from the group consisting of Mg, Fe, Co, Ba, Cr, W, Mo, Y, Zr, Nb, and Ce).Type: ApplicationFiled: September 16, 2016Publication date: September 13, 2018Inventors: Tetsuya Mitsumoto, Hideaki Matsushima, Shinya Kagei
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Patent number: 9893355Abstract: Provided is a new spinel type lithium manganese transition metal oxide for use in lithium batteries, which can increase the capacity retention ratio during cycling, and can increase the power output retention ratio during cycling. Disclosed is a spinel type lithium manganese transition metal oxide having an angle of repose of 50° to 75°, and having an amount of moisture (25° C. to 300° C.) measured by the Karl Fischer method of more than 0 ppm and less than 400 ppm.Type: GrantFiled: December 27, 2012Date of Patent: February 13, 2018Assignee: Mitsui Mining & Smelting Co., Ltd.Inventors: Tetsuya Mitsumoto, Hitohiko Ide, Shinya Kagei, Yoshimi Hata, Natsumi Shibamura
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Publication number: 20170309907Abstract: Provided is a new 5 V-class spinel-type lithium-manganese-containing composite oxide capable of achieving both the expansion of a high potential capacity region and the suppression of gas generation. Proposed is the spinel-type lithium-manganese-containing composite oxide comprising Li, Mn, O and two or more other elements, and having an operating potential of 4.5 V or more at a metal Li reference potential, wherein a peak is present in a range of 14.0 to 16.5° at 2?, in an X-ray diffraction pattern measured by a powder X-ray diffractometer (XRD) using CuK?1 ray.Type: ApplicationFiled: April 28, 2016Publication date: October 26, 2017Inventors: Tetsuya Mitsumoto, Kyohei Yamaguchi, Toshikazu Matsuyama, Hideaki Matsushima, Shinya Kagei
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Publication number: 20170309908Abstract: Provided is a new 5 V class spinel-type lithium manganese-containing composite oxide which enables the expansion of a high potential capacity region and the suppression of gas generation. The 5 V class spinel-type lithium manganese-containing composite oxide has an operating potential of 4.5 V or more at a metal Li reference potential, and contains Li, Mn, O and two or more other elements. The spinel-type lithium manganese-containing composite oxide is characterized in that, in an electronic diffraction image from a transmission electron microscope (TEM), a diffraction spot observed in the Fd-3m structure as well as a diffraction spot not observed in the Fd-3m structure are confirmed.Type: ApplicationFiled: April 28, 2016Publication date: October 26, 2017Inventors: Tetsuya Mitsumoto, Kyohei Yamaguchi, Toshikazu Matsuyama, Hideaki Matsushima, Shinya Kagei
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Patent number: 9786914Abstract: There is provided a Co-based 5-V spinel-type lithium manganese-containing complex oxide not only having an operating potential of 4.5 V or higher but also being capable of extending its capacity region of a 5.5 to 5.5 V region and being capable of enhancing its energy density as well. There is proposed a spinel-type lithium cobalt manganese-containing complex oxide having a crystal structure classified as a space group Fd-3m and being represented by the general formula [Lix(CoyMn3?x?y)O4??] (wherein 0.90?x?1.15 and 0.75?y?1.25), wherein the oxide has a crystallite size measured by a Rietveld method using the fundamental method of 100 nm to 200 nm, an interatomic distance of Li—O of 1.80 ? to 2.00 ?, and a strain of 0.20 to 0.50.Type: GrantFiled: December 4, 2014Date of Patent: October 10, 2017Assignee: Mitsui Mining & Smelting Co., Ltd.Inventors: Kyohei Yamaguchi, Natsumi Ito, Tsukasa Takahashi, Tetsuya Mitsumoto, Shinya Kagei, Yoshimi Hata
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Publication number: 20170288215Abstract: A positive electrode active material comprising a lithium metal composite oxide having a layered crystal structure provides a novel lithium metal composite oxide powder which can suppress the reaction with an electrolytic solution and raise the charge-discharge cycle ability of a battery, and can improve the output characteristics of a battery. A lithium metal composite oxide powder comprises a particle having a surface portion where one or a combination of two or more (“surface element A”) of the group consisting of Al, Ti and Zr is present, on the surface of a particle comprising a lithium metal composite oxide having a layered crystal structure, wherein the amount of surface LiOH is smaller than 0.10% by weight, and the amount of surface Li2CO3 is smaller than 0.25% by weight; in an X-ray diffraction pattern, the ratio of an integral intensity of the (003) plane of the lithium metal composite oxide to that of the (104) plane thereof is higher than 1.Type: ApplicationFiled: September 3, 2015Publication date: October 5, 2017Inventors: Tetsuya Mitsumoto, Daisuke Washida, Toshikazu Matsuyama, Daisuke Inoue, Hideaki Matsushima, Yoshimi Hata, Hitohiko Ide, Shinya Kagei
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Patent number: 9640794Abstract: Provided is a lithium metal compound oxide having a layered structure, which is very excellent as a positive electrode active material of a battery that is mounted on, particularly, an electric vehicle or a hybrid vehicle. Suggested is a lithium metal compound oxide having a layered structure which is expressed by general formula of Li1+xM1?xO2 (M represents metal elements including three elements of Mn, Co, and Ni). In the lithium metal compound oxide having a layered structure, D50 is more than 4 ?m and less than 20 ?m, a ratio of a primary particle area to a secondary particle area of secondary particles having a size corresponding to the D50 (“primary particle area/secondary particle area”) is 0.004 to 0.035, and the minimum value of powder crushing strength that is obtained by crushing a powder using a microcompression tester is more than 70 MPa.Type: GrantFiled: April 16, 2013Date of Patent: May 2, 2017Assignee: Mitsui Mining & Smelting Co., Ltd.Inventors: Tetsuya Mitsumoto, Hitohiko Ide, Shinya Kagei, Yoshimi Hata
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Publication number: 20170012286Abstract: The present invention relates to a positive electrode active material including a lithium metal composite oxide having a layer crystal structure, and provides a novel positive electrode active material for a lithium secondary cell, which can suppress the reaction with an electrolyte solution and can raise the charge-discharge cycle ability of the cell, and can make good the output characteristics of the cell.Type: ApplicationFiled: September 3, 2015Publication date: January 12, 2017Inventors: Daisuke Washida, Toshikazu Matsuyama, Tetsuya Mitsumoto, Daisuke Inoue, Hideaki Matsushima, Yoshimi Hata, Hitohiko Ide, Shinya Kagei
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Publication number: 20160301072Abstract: There is provided a Co-based 5-V spinel-type lithium manganese-containing complex oxide not only having an operating potential of 4.5 V or higher but also being capable of extending its capacity region of a 5.5 to 5.5 V region and being capable of enhancing its energy density as well. There is proposed a spinel-type lithium cobalt manganese-containing complex oxide having a crystal structure classified as a space group Fd-3m and being represented by the general formula [Lix(CoyMn3-x-y)O4-?] (wherein 0.90?x?1.15 and 0.75?y?1.25), wherein the oxide has a crystallite size measured by a Rietveld method using the fundamental method of 100 nm to 200 nm, an interatomic distance of Li—O of 1.80 ? to 2.00 ?, and a strain of 0.20 to 0.50.Type: ApplicationFiled: December 4, 2014Publication date: October 13, 2016Inventors: Kyohei YAMAGUCHI, Natsumi ITO, Tsukasa TAKAHASHI, Tetsuya MITSUMOTO, Shinya KAGEI, Yoshimi HATA
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Patent number: 9391313Abstract: Provided is a lithium metal composite oxide (powder) having a layered structure, which is capable of exhibiting excellent characteristics in both charge-discharge cycle ability and initial charging and discharging efficiency, and is capable of effectively reducing initial resistance, when being used in a positive electrode of a lithium battery. The lithium metal composite oxide (powder) comprises an amount of S which is less than 0.10% by mass of the lithium metal composite oxide powder, a ratio of a crystallite size of a (003) plane to a crystallite size of a (110) plane which is equal to or greater than 1.0 and less than 2.5, and a ratio of a primary particle area to a secondary particle area of 0.004 to 0.035.Type: GrantFiled: March 4, 2014Date of Patent: July 12, 2016Assignee: Mitsui Mining & Smelting Co., Ltd.Inventors: Tetsuya Mitsumoto, Hitohiko Ide, Shinya Kagei, Yoshimi Hata
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Publication number: 20160013472Abstract: Provided is a lithium metal composite oxide (powder) having a layered structure, which is capable of exhibiting excellent characteristics in both charge-discharge cycle ability and initial charging and discharging efficiency, and is capable of effectively reducing initial resistance, when being used in a positive electrode of a lithium battery. The lithium metal composite oxide (powder) comprises an amount of S which is less than 0.10% by mass of the lithium metal composite oxide powder, a ratio of a crystallite size of a (003) plane to a crystallite size of a (110) plane which is equal to or greater than 1.0 and less than 2.5, and a ratio of a primary particle area to a secondary particle area of 0.004 to 0.035.Type: ApplicationFiled: March 4, 2014Publication date: January 14, 2016Inventors: Tetsuya Mitsumoto, Hitohiko Ide, Shinya Kagei, Yoshimi Hata
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Publication number: 20150180025Abstract: Provided is a novel lithium metal complex oxide powder, which is capable of maintaining stability of the slurry viscosity during storage of a slurry even when D50 thereof is less than 10 ?m, and which is also capable of suppressing a decrease in the discharge capacity during high temperature cycles. Proposed is a lithium metal complex oxide which is characterized by having a D50 of less than 10 ?m and a carbon amount per unit BET specific surface area of from 1100 ppm/(m2/g) to 7500 ppm/(m2/g).Type: ApplicationFiled: July 12, 2013Publication date: June 25, 2015Inventors: Tetsuya Mitsumoto, Hitohiko Ide, Shinya Kagei, Yoshimi Hata
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Publication number: 20150093641Abstract: Provided is a lithium metal compound oxide having a layered structure, which is very excellent as a positive electrode active material of a battery that is mounted on, particularly, an electric vehicle or a hybrid vehicle. Suggested is a lithium metal compound oxide having a layered structure which is expressed by general formula of Li1+xM1?xO2 (M represents metal elements including three elements of Mn, Co, and Ni). In the lithium metal compound oxide having a layered structure, D50 is more than 4 ?m and less than 20 ?m, a ratio of a primary particle area to a secondary particle area of secondary particles having a size corresponding to the D50 (“primary particle area/secondary particle area”) is 0.004 to 0.035, and the minimum value of powder crushing strength that is obtained by crushing a powder using a microcompression tester is more than 70 MPa.Type: ApplicationFiled: April 16, 2013Publication date: April 2, 2015Inventors: Tetsuya Mitsumoto, Hitohiko Ide, Shinya Kagei, Yoshimi Hata
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Publication number: 20140353547Abstract: Provided is a new spinel type lithium manganese transition metal oxide for use in lithium batteries, which can increase the capacity retention ratio during cycling, and can increase the power output retention ratio during cycling. Disclosed is a spinel type lithium manganese transition metal oxide having an angle of repose of 50° to 75°, and having an amount of moisture (25° C. to 300° C.) measured by the Karl Fischer method of more than 0 ppm and less than 400 ppm.Type: ApplicationFiled: December 27, 2012Publication date: December 4, 2014Inventors: Tetsuya Mitsumoto, Hitohiko Ide, Shinya Kagei, Yoshimi Hata, Natsumi Shibamura
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Publication number: 20140329147Abstract: Provided is a lithium metal composite oxide having a layered structure, which is particularly excellent as a positive electrode active material for batteries that are mounted on electric vehicles or hybrid vehicles. Proposed is a lithium metal composite oxide having a layered structure, which is represented by general formula Li1+x(Mn?Co?Ni?)1?xO2 (0.00?X?0.07, 0.10???0.40, 0.10???0.40, and 0.30???0.75) and has a specific surface area of more than 2.0 m2/g but 5.0 m2/g or less and has an average particle size of the primary particles/crystallite size ratio of 5.7 to 18.5.Type: ApplicationFiled: November 26, 2012Publication date: November 6, 2014Inventors: Tetsuya Mitsumoto, Yasuhiro Ochi, Tomohiro Sakata, Hitohiko Ide, Yoshimi Hata, Shinya Kagei
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Patent number: 8734998Abstract: Provided is spinel-type lithium transition metal oxide (LMO) used as a positive electrode active material for lithium battery, said LMO being capable of simultaneously achieving all output characteristics (rate characteristics), high temperature cycle life characteristics, and rapid charging characteristics. The disclosed is spinel-type lithium transition metal oxide including, besides Li and Mn, one or more elements selected from a group consisting of Mg, Ti, Ni, Co, and Fe, and having crystallite size of between 200 nm and 1000 nm and strain of 0.0900 or less. Because the crystallite size is markedly large, oxygen deficiency is markedly little, and the structure is strong, when the LMO is used as a positive electrode active material for lithium secondary batteries, all output characteristics (rate characteristics), high temperature cycle life characteristics, and rapid charging characteristics can be achieved simultaneously.Type: GrantFiled: July 13, 2011Date of Patent: May 27, 2014Assignee: Mitsui Mining & Smelting Co., Ltd.Inventors: Shinya Kagei, Keisuke Miyanohara, Yoshimi Hata, Yasuhiro Ochi, Tetsuya Mitsumoto
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Publication number: 20130122372Abstract: Provided is spinel-type lithium transition metal oxide (LMO) used as a positive electrode active material for lithium battery, said LMO being capable of simultaneously achieving all output characteristics (rate characteristics), high temperature cycle life characteristics, and rapid charging characteristics. The disclosed is spinel-type lithium transition metal oxide including, besides Li and Mn, one or more elements selected from a group consisting of Mg, Ti, Ni, Co, and Fe, and having crystallite size of between 200 nm and 1000 nm and strain of 0.0900 or less. Because the crystallite size is markedly large, oxygen deficiency is markedly little, and the structure is strong, when the LMO is used as a positive electrode active material for lithium secondary batteries, all output characteristics (rate characteristics), high temperature cycle life characteristics, and rapid charging characteristics can be achieved simultaneously.Type: ApplicationFiled: July 13, 2011Publication date: May 16, 2013Applicant: Mitsui Mining & Smelting Co., Ltd.Inventors: Shinya Kagei, Keisuke Miyanohara, Yoshimi Hata, Yasuhiro Ochi, Tetsuya Mitsumoto
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Publication number: 20120219797Abstract: The present invention provides a semiconductor powder composed of Cu-M-Sn—S in a single phase wherein M is at least one selected from the group consisting of Zn, Co, Ni, Fe and Mn, the powder being obtained by wet synthesis, and a method for producing this semiconductor powder. According to the present invention, it is possible to provide, in a simple way, a high-grade semiconductor powder composed of a single-phase Cu-M-Sn—S such as CZTS.Type: ApplicationFiled: June 3, 2010Publication date: August 30, 2012Applicant: MITSUI MINING & SMELTING CO., LTD.Inventors: Tetsuya Mitsumoto, Yuichi Anno