Patents by Inventor Takeshi Kawasato
Takeshi Kawasato 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: 11171333Abstract: There is provided a production method of a lithium-containing composite oxide capable of improving performances of cycle characteristics, rate characteristics, and the like of a lithium ion secondary battery. A production method of a lithium-containing composite oxide is characterized in that when producing a lithium-containing composite oxide by mixing a transition metal hydroxide containing Ni and Mn essentially and a lithium source and heating the mixture, a transition metal hydroxide having a crystallite diameter of the (100) plane being 35 nm or less in a crystal structure model in the space group P-3m1 of an X-ray diffraction pattern is used.Type: GrantFiled: October 8, 2019Date of Patent: November 9, 2021Assignee: SUMITOMO CHEMICAL CO., LTD.Inventors: Masahiko Tamura, Takeshi Kawasato, Satoshi Asakura
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Patent number: 11043695Abstract: To provide a lithium-containing composite oxide, a cathode active material and a positive electrode for a lithium ion secondary battery, with which a lithium ion secondary battery having favorable cycle characteristics even when charged at a high voltage can be obtained; and a lithium ion secondary battery having favorable cycle characteristics even when charged at a high voltage. A lithium-containing composite oxide which is represented by LiaNibCocMndMeO2 wherein M is Mg, Ca, Al, Ti, V, Nb, Mo, W or Zr, a+b+c+d+e=2, “a” is from 1.01 to 1.10, b is from 0.30 to 0.95, c is from 0 to 0.35, d is from 0 to 0.35, and e is from 0 to 0.05, wherein in an X-ray diffraction pattern obtained by reflection X-ray diffraction employing Cu-K? rays, the ratio (I104/I110) of the integrated intensity (I104) of a peak of (104) plane to the integrated intensity (I110) of a peak of (110) plane is at least 4.20.Type: GrantFiled: February 3, 2017Date of Patent: June 22, 2021Assignee: SUMITOMO CHEMICAL COMPANY, LIMITEDInventors: Masahiko Tamura, Tomoo Kato, Takeshi Kawasato, Ryo Eguchi
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Patent number: 10964944Abstract: To provide a lithium-containing composite oxide capable of obtaining a lithium ion secondary battery having a large discharge capacity wherein the deterioration of the discharge voltage due to repetition of a charge and discharge cycle is suppressed, a cathode active material, a positive electrode for a lithium ion secondary battery and a lithium ion secondary battery. A lithium-containing composite oxide, which is represented by the formula I: LiaiNibCOcMndMeO2??Formula I, wherein M is at least one member selected from the group consisting of Na, Mg, Ti, Zr, Al, W and Mo, a+b+c+d+e=2, 1.1?a/(b+c+d+e)?1.4, 0.2?b/(b+c+d+e)?0.5, 0?c/(b+c+d+e)?0.25, 0.3?d/(b+c+d+e)?0.6, and 0?e/(b+c+d+e)?0.1, and wherein the valence of Ni is from 2.15 to 2.45.Type: GrantFiled: June 3, 2019Date of Patent: March 30, 2021Assignee: SUMITOMO CHEMICAL CO., LTD.Inventors: Ryo Eguchi, Takeshi Kawasato
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Patent number: 10910640Abstract: To provide a cathode active material for a lithium ion secondary battery excellent in the cycle characteristics and rate characteristics even when charging is conducted at a high voltage. A cathode active material for a lithium ion secondary battery, which comprises particles (III) having a covering layer comprising a metal oxide (I) containing at least one metal element selected from the group consisting of elements in Groups 3 and 13 of the periodic table and lanthanoid elements, and a compound (II) containing Li and P, on the surface of a lithium-containing composite oxide comprising lithium and a transition metal element, wherein the atomic ratio of said P to said metal element (P/metal element) contained within 5 nm of the surface layer of the particles (III) is from 0.03 to 0.45.Type: GrantFiled: April 17, 2019Date of Patent: February 2, 2021Assignee: SUMITOMO CHEMICAL CO., LTDInventors: Takeshi Kawasato, Kentaro Tsunozaki, Haisheng Zeng, Yasuyuki Takimoto, Toshio Suzuki, Tegi Ri
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Publication number: 20200044248Abstract: There is provided a production method of a lithium-containing composite oxide capable of improving performances of cycle characteristics, rate characteristics, and the like of a lithium ion secondary battery. A production method of a lithium-containing composite oxide is characterized in that when producing a lithium-containing composite oxide by mixing a transition metal hydroxide containing Ni and Mn essentially and a lithium source and heating the mixture, a transition metal hydroxide having a crystallite diameter of the (100) plane being 35 nm or less in a crystal structure model in the space group P-3m1 of an X-ray diffraction pattern is used.Type: ApplicationFiled: October 8, 2019Publication date: February 6, 2020Applicant: SUMITOMO CHEMICAL CO., LTD.Inventors: Masahiko TAMURA, Takeshi KAWASATO, Satoshi ASAKURA
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Patent number: 10483536Abstract: There is provided a production method of a lithium-containing composite oxide capable of improving performances of cycle characteristics, rate characteristics, and the like of a lithium ion secondary battery. A production method of a lithium-containing composite oxide is characterized in that when producing a lithium-containing composite oxide by mixing a transition metal hydroxide containing Ni and Mn essentially and a lithium source and heating the mixture, a transition metal hydroxide having a crystallite diameter of the (100) plane being 35 nm or less in a crystal structure model in the space group P-3m1 of an X-ray diffraction pattern is used.Type: GrantFiled: August 12, 2015Date of Patent: November 19, 2019Assignee: SUMITOMO CHEMICAL CO., LTD.Inventors: Masahiko Tamura, Takeshi Kawasato, Satoshi Asakura
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Publication number: 20190296350Abstract: To provide a lithium-containing composite oxide capable of obtaining a lithium ion secondary battery having a large discharge capacity wherein the deterioration of the discharge voltage due to repetition of a charge and discharge cycle is suppressed, a cathode active material, a positive electrode for a lithium ion secondary battery and a lithium ion secondary battery. A lithium-containing composite oxide, which is represented by the formula I: LiaiNibCOcMndMeO2??Formula I, wherein M is at least one member selected from the group consisting of Na, Mg, Ti, Zr, Al, W and Mo, a+b+c+d+e=2, 1.1?a/(b+c+d+e)?1.4, 0.2?b/(b+c+d+e)?0.5, 0?c/(b+c+d+e)?0.25, 0.3?d/(b+c+d+e)?0.6, and 0?e/(b+c+d+e)?0.1, and wherein the valence of Ni is from 2.15 to 2.45.Type: ApplicationFiled: June 3, 2019Publication date: September 26, 2019Applicant: SUMITOMO CHEMICAL CO., LTD.Inventors: Ryo EGUCHI, Takeshi KAWASATO
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Publication number: 20190245202Abstract: To provide a cathode active material for a lithium ion secondary battery excellent in the cycle characteristics and rate characteristics even when charging is conducted at a high voltage. A cathode active material for a lithium ion secondary battery, which comprises particles (III) having a covering layer comprising a metal oxide (I) containing at least one metal element selected from the group consisting of elements in Groups 3 and 13 of the periodic table and lanthanoid elements, and a compound (II) containing Li and P, on the surface of a lithium-containing composite oxide comprising lithium and a transition metal element, wherein the atomic ratio of said P to said metal element (P/metal element) contained within 5 nm of the surface layer of the particles (III) is from 0.03 to 0.45.Type: ApplicationFiled: April 17, 2019Publication date: August 8, 2019Applicant: SUMITOMO CHEMICAL CO., LTDInventors: Takeshi KAWASATO, Kentaro Tsunozaki, Haisheng Zeng, Yasuyuki Takimoto, Toshio Suzuki, Tegi Ri
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Patent number: 10326127Abstract: To provide a cathode active material for a lithium ion secondary battery excellent in the cycle characteristics and rate characteristics even when charging is conducted at a high voltage. A cathode active material for a lithium ion secondary battery, which comprises particles (III) having a covering layer comprising a metal oxide (I) containing at least one metal element selected from the group consisting of elements in Groups 3 and 13 of the periodic table and lanthanoid elements, and a compound (II) containing Li and P, on the surface of a lithium-containing composite oxide comprising lithium and a transition metal element, wherein the atomic ratio of said P to said metal element (P/metal element) contained within 5 nm of the surface layer of the particles (III) is from 0.03 to 0.45.Type: GrantFiled: March 31, 2014Date of Patent: June 18, 2019Assignee: SUMITOMO CHEMICAL CO., LTD.Inventors: Takeshi Kawasato, Kentaro Tsunozaki, Haisheng Zeng, Yasuyuki Takimoto, Toshio Suzuki, Tegi Ri
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Publication number: 20190027782Abstract: To provide a lithium-containing composite oxide, a cathode active material and a positive electrode for a lithium ion secondary battery, with which a lithium ion secondary battery having favorable cycle characteristics even when charged at a high voltage can be obtained; and a lithium ion secondary battery having favorable cycle characteristics even when charged at a high voltage. A lithium-containing composite oxide which is represented by LiaNibCocMndMeO2 wherein M is Mg, Ca, Al, Ti, V, Nb, Mo, W or Zr, a+b+c+d+e=2, “a” is from 1.01 to 1.10, b is from 0.30 to 0.95, c is from 0 to 0.35, d is from 0 to 0.35, and e is from 0 to 0.05, wherein in an X-ray diffraction pattern obtained by reflection X-ray diffraction employing Cu-K? rays, the ratio (I104/I110) of the integrated intensity (I104) of a peak of (104) plane to the integrated intensity (I110) of a peak of (110) plane is at least 4.20.Type: ApplicationFiled: February 3, 2017Publication date: January 24, 2019Applicant: SUMITOMO CHEMICAL COMPANY, LIMITEDInventors: Masahiko TAMURA, Tomoo KATO, Takeshi KAWASATO, Ryo EGUCHI
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Patent number: 10153489Abstract: A lithium-containing composite oxide essentially containing Li, Ni, Co and Mn, which has a crystal structure with space group R-3m, with a c-axis lattice constant being from 14.208 to 14.228 ?, and with an a-axis lattice constant and the c-axis lattice constant satisfying the relation of 3a+5.615?c?3a+5.655, and of which the integrated intensity ratio (I003/I104) of the (003) peak to the (104) peak in an XRD pattern is from 1.21 to 1.39.Type: GrantFiled: April 21, 2015Date of Patent: December 11, 2018Assignee: SUMITOMO CHEMICAL CO., LTD.Inventors: Takeshi Kawasato, Masahiko Tamura, Ryo Eguchi
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Patent number: 10135064Abstract: To provide a cathode active material for a lithium ion secondary battery excellent in the cycle characteristics and rate characteristics even when charging is conducted at a high voltage. A cathode active material for a lithium ion secondary battery, which comprises particles (III) having a covering layer comprising a metal oxide (I) containing at least one metal element selected from the group consisting of Al, Y, Ga, In, La, Pr, Nd, Gd, Dy, Er and Yb, and a compound (II) containing Li and at least one non-metal element selected from the group consisting of S and B, on the surface of a lithium-containing composite oxide, wherein the atomic ratio (the non-metal element/the metal element) contained within 5 nm of the surface layer of the particles (III) is within a specific range.Type: GrantFiled: February 5, 2014Date of Patent: November 20, 2018Assignee: SUMITOMO CHEMICAL CO., LTD.Inventors: Takeshi Kawasato, Kentaro Tsunozaki, Haisheng Zeng, Yasuyuki Takimoto, Toshio Suzuki
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Publication number: 20160365576Abstract: To provide a lithium-containing composite oxide capable of obtaining a lithium ion secondary battery having a large discharge capacity wherein the deterioration of the discharge voltage due to repetition of a charge and discharge cycle is suppressed, a cathode active material, a positive electrode for a lithium ion secondary battery and a lithium ion secondary battery. A lithium-containing composite oxide, which is represented by the formula I: LiaiNibCocMndMeO2??Formula I, wherein M is at least one member selected from the group consisting of Na, Mg, Ti, Zr, Al, W and Mo, a+b+c+d+e=2, 1.1?a/(b+c+d+e)?1.4, 0.2?b/(b+c+d+e)?0.5, 0?c/(b+c+d+e)?0.25, 0.3?d/(b+c+d+e)?0.6, and 0?e/(b+c+d+e)?0.1, and wherein the valence of Ni is from 2.15 to 2.45.Type: ApplicationFiled: May 26, 2016Publication date: December 15, 2016Applicant: Asahi Glass Company, LimitedInventors: Ryo EGUCHI, Takeshi KAWASATO
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Patent number: 9444099Abstract: To provide a cathode active material for a lithium ion secondary battery, and its production process. A lithium-containing composite oxide containing a transition metal element and a composition (1) are contacted to obtain particles (I) having a compound containing a metal element (M) attached, which are mixed with a compound which generates HF by heating, and the mixture is heated to obtain particles (III) having a covering layer (II) containing the metal element (M) and fluorine element formed on the surface of the lithium-containing composite oxide. Composition (1): a composition having a compound containing no Li element and containing at least one metal element (M) selected from Mg, Ca, Sr, Ba, Y, Ti, Zr, Hf, V, Nb, Ta, Cr, Mo, W, Mn, Fe, Co, Ni, Pb, Cu, Zn, Al, In, Sn, Sb, Bi, La, Ce, Pr, Nd, Gd, Dy, Er and Yb dissolved or dispersed in a solvent.Type: GrantFiled: December 24, 2013Date of Patent: September 13, 2016Assignee: Asahi Glass Company, LimitedInventors: Kentaro Tsunozaki, Haisheng Zeng, Takeshi Kawasato
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Patent number: 9306213Abstract: To provide a process for producing a cathode active material for a lithium ion secondary battery, a cathode for a lithium ion secondary battery, and a lithium ion secondary battery. A production process which comprises contacting a lithium-containing composite oxide containing Li element and a transition metal element with a composition (1) {an aqueous solution containing cation M having at least one metal element (m)} and a composition (2) {an aqueous solution containing anion N having at least one element (n) selected from the group consisting of S, P, F and B, forming a hardly soluble salt when reacted with the cation M}, wherein the total amount A (mL/100 g) of the composition (1) and the composition (2) contacted per 100 g of the lithium-containing composite oxide is in a ratio of 0.1<A/B<5 based on the oil absorption B (mL/100 g) of the lithium-containing composite oxide.Type: GrantFiled: December 24, 2013Date of Patent: April 5, 2016Assignee: Asahi Glass Company, LimitedInventors: Kentaro Tsunozaki, Haisheng Zeng, Takeshi Kawasato
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Publication number: 20160056458Abstract: There is provided a production method of a lithium-containing composite oxide capable of improving performances of cycle characteristics, rate characteristics, and the like of a lithium ion secondary battery. A production method of a lithium-containing composite oxide is characterized in that when producing a lithium-containing composite oxide by mixing a transition metal hydroxide containing Ni and Mn essentially and a lithium source and heating the mixture, a transition metal hydroxide having a crystallite diameter of the (100) plane being 35 nm or less in a crystal structure model in the space group P-3m1 of an X-ray diffraction pattern is used.Type: ApplicationFiled: August 12, 2015Publication date: February 25, 2016Applicant: ASAHI GLASS COMPANY, LIMITEDInventors: Masahiko TAMURA, Takeshi KAWASATO, Satoshi ASAKURA
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Publication number: 20150380737Abstract: To provide a lithium-containing composite oxide in which lithium ions highly diffuse in the primary particles, and which is excellent in the output characteristics at low temperature, and a process for its production. A lithium-containing composite oxide essentially containing Li, Ni, Co and Mn, which has a crystal structure with space group R-3m, with a c-axis lattice constant being from 14.208 to 14.228 ?, and with an a-axis lattice constant and the c-axis lattice constant satisfying the relation of 3a+5.615?c?3a+5.655, and of which the integrated intensity ratio (I003/I104) of the (003) peak to the (104) peak in an XRD pattern is from 1.21 to 1.39.Type: ApplicationFiled: April 21, 2015Publication date: December 31, 2015Applicant: Asahi Glass Company, LimitedInventors: Takeshi KAWASATO, Masahiko TAMURA, Ryo EGUCHI
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Patent number: 8883352Abstract: To provide a surface modified lithium-containing composite oxide having excellent discharge capacity, volume capacity density, safety, durability for charge and discharge cycles, and high rate property. A surface modified lithium-containing composite oxide, comprising particles of a lithium-containing composite oxide having a predetermined composition and a lithium titanium composite oxide containing lithium, titanium and element Q (wherein Q is at least one element selected from the group consisting of B, Al, Sc, Y and In) contained in the surface layer of the particles, wherein the lithium titanium composite oxide is contained in the surface layer of the particles in a proportion of the total amount of titanium and element Q in the lithium titanium composite oxide contained in the surface layer to the lithium-containing composite oxide particles is from 0.01 to 2 mol %, and the lithium titanium composite oxide has a peak at a diffraction angle 2? within a range of 43.8±0.Type: GrantFiled: August 3, 2011Date of Patent: November 11, 2014Assignee: AGC Seimi Chemical Co., Ltd.Inventors: Remi Hiraki, Takeshi Kawasato
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Patent number: 8795896Abstract: A lithium/nickel/cobalt/manganese-containing composite oxide powder represented by the formula LipNixCoyMnzMqO2-aFa (wherein M is at least one element selected from the group consisting of Al, Ge, Sn, alkaline earth metal elements and transition metal elements other than Co, Mn and Ni, 0.9?p?1.1, 0.2?x?0.5, 0.2?y?0.5, 0.1?z?0.4, 0?q?0.5, 1.9?a?2.1, p+x+y+z+q=2, and 0?a?0.02), characterized in that when the powder is classified into small particle size-classified particles with an average particle size 2 ?m?D50?8 ?m and large particle size-classified particles with an average particle size of 10 ?m?D50?75 ?m, the ratio of (% by weight of the small particle size-classified particles)/(% by weight of the large particle size-classified particles) is from 15/85 to 40/60.Type: GrantFiled: June 18, 2009Date of Patent: August 5, 2014Assignee: AGC Seimi Chemical Co., Ltd.Inventors: Takeshi Kawasato, Takuya Mihara, Koichiro Ueda, Yukimitsu Wakasugi, Nozomi Honda
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Publication number: 20140212758Abstract: To provide a cathode active material for a lithium ion secondary battery excellent in the cycle characteristics and rate characteristics even when charging is conducted at a high voltage. A cathode active material for a lithium ion secondary battery, which comprises particles (III) having a covering layer comprising a metal oxide (I) containing at least one metal element selected from the group consisting of elements in Groups 3 and 13 of the periodic table and lanthanoid elements, and a compound (II) containing Li and P, on the surface of a lithium-containing composite oxide comprising lithium and a transition metal element, wherein the atomic ratio of said P to said metal element (P/metal element) contained within 5 nm of the surface layer of the particles (III) is from 0.03 to 0.45.Type: ApplicationFiled: March 31, 2014Publication date: July 31, 2014Applicant: ASAHI GLASS COMPANY, LIMITEDInventors: Takeshi KAWASATO, Kentaro TSUNOZAKI, Haisheng ZENG, Yasuyuki TAKIMOTO, Toshio SUZUKI, Tegi RI