Patents by Inventor Rei Kokado
Rei Kokado 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: 10818921Abstract: Disclosed are: nickel complex hydroxide particles that have small and uniform particle diameters; and a method by which the nickel complex hydroxide particles can be produced. Specifically disclosed is a method for producing a nickel complex hydroxide by a crystallization reaction, which comprises: a nucleation step in which nucleation is carried out, while controlling an aqueous solution for nucleation containing an ammonium ion supplying material and a metal compound that contains nickel to have a pH of 12.0-13.4 at a liquid temperature of 25° C.; and a particle growth step in which nuclei are grown, while controlling an aqueous solution for particle growth containing the nuclei, which have been formed in the nucleation step, to have a pH of 10.5-12.0 at a liquid temperature of 25° C. In this connection, the pH in the particle growth step is controlled to be less than the pH in the nucleation step.Type: GrantFiled: November 28, 2017Date of Patent: October 27, 2020Assignee: SUMITOMO METAL MINING CO., LTD.Inventors: Mori Kensaku, Shin Imaizumi, Rei Kokado
-
Patent number: 10516164Abstract: The purpose of the present invention is to easily provide at low cost, a cathode active material for non-aqueous electrolyte secondary batteries, which exhibits high particle strength and high weather resistance, while enabling achievement of excellent charge and discharge capacity and excellent output characteristics in cases where the cathode active material is used as a cathode material of a non-aqueous electrolyte secondary battery. A slurry of from 500 g/L to 2000 g/L is formed by adding water to a powder of a lithium nickel composite oxide represented by the general formula (A): LizNi1-x-yCoxMyO2, where 0.10?x?0.20, 0?y?0.10, 0.97?z?1.20, and M represents at least one element selected from among Mn, V, Mg, Mo, Nb, Ti and Al); the slurry is washed with water by stirring; and after filtration, the resulting material is subjected to a heat treatment at a temperature of from 120° C. to 550° C. (inclusive) in an oxygen atmosphere having an oxygen concentration of 80% by volume or more.Type: GrantFiled: July 13, 2018Date of Patent: December 24, 2019Assignee: SUMITOMO METAL MINING CO., LTD.Inventors: Tomoko Nakayama, Rei Kokado, Kensaku Mori
-
Patent number: 10461312Abstract: The present invention provides a cathode active material for a nonaqueous electrolyte secondary battery with a high capacity, high stability and excellent output characteristics and a method for producing the same, and a nonaqueous electrolyte secondary battery using the cathode active material. The cathode active material for a nonaqueous electrolyte secondary battery is represented by a general formula: LitNi1-x-y-zCoxAlyTizO2 wherein 0.98?t?1.10, 0<x?0.30, 0.03?y?0.15, 0.001?z?0.03; and includes a hexagonal lithium-containing composite oxide with a layer structure of secondary particles having primary particles, in which a titanium-enriched layer is formed on a surface of the primary particles and/or a grain boundary between the primary particles. The titanium-enriched layer on the surface of the primary particles and/or a grain boundary between the primary particles serves as a lithium ion conductor, yielding smooth extraction and insertion of lithium ions.Type: GrantFiled: April 1, 2011Date of Patent: October 29, 2019Assignee: SUMITOMO METAL MINING CO., LTD.Inventors: Shin Imaizumi, Rei Kokado, Kensaku Mori
-
Publication number: 20180323428Abstract: The purpose of the present invention is to easily provide at low cost, a cathode active material for non-aqueous electrolyte secondary batteries, which exhibits high particle strength and high weather resistance, while enabling achievement of excellent charge and discharge capacity and excellent output characteristics in cases where the cathode active material is used as a cathode material of a non-aqueous electrolyte secondary battery. A slurry of from 500 g/L to 2000 g/L is formed by adding water to a powder of a lithium nickel composite oxide represented by the general formula (A): LizNi1-x-yCoxMyO2, where 0.10?x?0.20, 0?y?0.10, 0.97?z?1.20, and M represents at least one element selected from among Mn, V, Mg, Mo, Nb, Ti and Al); the slurry is washed with water by stirring; and after filtration, the resulting material is subjected to a heat treatment at a temperature of from 120° C. to 550° C. (inclusive) in an oxygen atmosphere having an oxygen concentration of 80% by volume or more.Type: ApplicationFiled: July 13, 2018Publication date: November 8, 2018Applicant: SUMITOMO METAL MINING CO., LTD.Inventors: Tomoko NAKAYAMA, Rei KOKADO, Kensaku MORI
-
Patent number: 10090514Abstract: Provided is a positive-electrode material for nonaqueous-electrolyte secondary batteries, the positive-electrode material being capable of achieving both high capacity and high output when used for a positive electrode for nonaqueous-electrolyte secondary batteries. Also, provided is a method for manufacturing the positive-electrode material for nonaqueous-electrolyte secondary batteries, wherein a lithium metal composite oxide powder is mixed with lithium tungstate, the lithium metal composite oxide powder being represented by a general formula LizNi1?x?yCoxMyO2 (wherein 0.10?x?0.35, 0?y?0.35, 0.97?z?1.20, and M is an addition element and at least one element selected from Mn, V, Mg, Mo, Nb, Ti, and Al) and comprising primary particles and secondary particles composed of aggregation of the primary particles.Type: GrantFiled: December 16, 2016Date of Patent: October 2, 2018Assignee: Sumitomo Metal Mining Co., Ltd.Inventors: Rei Kokado, Kensaku Mori, Masanori Takagi, Tetsutaro Hayashi
-
Patent number: 10056610Abstract: The purpose of the present invention is to easily provide at low cost, a cathode active material for non-aqueous electrolyte secondary batteries, which exhibits high particle strength and high weather resistance, while enabling achievement of excellent charge and discharge capacity and excellent output characteristics in cases where the cathode active material is used as a cathode material of a non-aqueous electrolyte secondary battery. A slurry of from 500 g/L to 2000 g/L is formed by adding water to a powder of a lithium nickel composite oxide represented by the general formula (A): LizNi1?x?yCoxMyO2, where 0.10?x?0.20, 0?y?0.10, 0.97?z?1.20, and M represents at least one element selected from among Mn, V, Mg, Mo, Nb, Ti and Al); the slurry is washed with water by stirring; and after filtration, the resulting material is subjected to a heat treatment at a temperature of from 120° C. to 550° C. (inclusive) in an oxygen atmosphere having an oxygen concentration of 80% by volume or more.Type: GrantFiled: May 22, 2014Date of Patent: August 21, 2018Assignee: SUMITOMO METAL MINING CO., LTD.Inventors: Tomoko Nakayama, Rei Kokado, Kensaku Mori
-
Patent number: 9991505Abstract: Provided is a positive-electrode material for nonaqueous-electrolyte secondary batteries, the positive-electrode material being capable of achieving both high capacity and high output when used for a positive electrode for nonaqueous-electrolyte secondary batteries. Also, provided is a method for manufacturing the positive-electrode material for nonaqueous-electrolyte secondary batteries, wherein a lithium metal composite oxide powder is mixed with lithium tungstate, the lithium metal composite oxide powder being represented by a general formula LizNi1-x-yCoxMyO2 (wherein 0.10?x?0.35, 0?y?0.35, 0.97?z?1.20, and M is an addition element and at least one element selected from Mn, V, Mg, Mo, Nb, Ti, and Al) and comprising primary particles and secondary particles composed of aggregation of the primary particles.Type: GrantFiled: February 14, 2013Date of Patent: June 5, 2018Assignee: Sumitomo Metal Mining Co., Ltd.Inventors: Rei Kokado, Kensaku Mori, Masanori Takagi, Tetsutaro Hayashi
-
Publication number: 20180145326Abstract: Disclosed are: nickel complex hydroxide particles that have small and uniform particle diameters; and a method by which the nickel complex hydroxide particles can be produced. Specifically disclosed is a method for producing a nickel complex hydroxide by a crystallization reaction, which comprises: a nucleation step in which nucleation is carried out, while controlling an aqueous solution for nucleation containing an ammonium ion supplying material and a metal compound that contains nickel to have a pH of 12.0-13.4 at a liquid temperature of 25° C.; and a particle growth step in which nuclei are grown, while controlling an aqueous solution for particle growth containing the nuclei, which have been formed in the nucleation step, to have a pH of 10.5-12.0 at a liquid temperature of 25° C. In this connection, the pH in the particle growth step is controlled to be less than the pH in the nucleation step.Type: ApplicationFiled: November 28, 2017Publication date: May 24, 2018Applicant: SUMITOMO METAL MINING CO., LTD.Inventors: Mori Kensaku, Shin Imaizumi, Rei Kokado
-
Patent number: 9859557Abstract: Disclosed are: nickel complex hydroxide particles that have small and uniform particle diameters; and a method by which the nickel complex hydroxide particles can be produced. Specifically disclosed is a method for producing a nickel complex hydroxide by a crystallization reaction, which comprises: a nucleation step in which nucleation is carried out, while controlling an aqueous solution for nucleation containing an ammonium ion supplying material and a metal compound that contains nickel to have a pH of 12.0-13.4 at a liquid temperature of 25° C.; and a particle growth step in which nuclei are grown, while controlling an aqueous solution for particle growth containing the nuclei, which have been formed in the nucleation step, to have a pH of 10.5-12.0 at a liquid temperature of 25° C. In this connection, the pH in the particle growth step is controlled to be less than the pH in the nucleation step.Type: GrantFiled: December 2, 2010Date of Patent: January 2, 2018Assignee: SUMITOMO METAL MINING CO., LTD.Inventors: Kensaku Mori, Shin Imaizumi, Rei Kokado
-
Publication number: 20170098821Abstract: Provided is a positive-electrode material for nonaqueous-electrolyte secondary batteries, the positive-electrode material being capable of achieving both high capacity and high output when used for a positive electrode for nonaqueous-electrolyte secondary batteries. Also, provided is a method for manufacturing the positive-electrode material for nonaqueous-electrolyte secondary batteries, wherein a lithium metal composite oxide powder is mixed with lithium tungstate, the lithium metal composite oxide powder being represented by a general formula LizNi1-x-yCoxMyO2 (wherein 0.10?x?0.35, 0?y?0.35, 0.97?z?1.20, and M is an addition element and at least one element selected from Mn, V, Mg, Mo, Nb, Ti, and Al) and comprising primary particles and secondary particles composed of aggregation of the primary particles.Type: ApplicationFiled: December 16, 2016Publication date: April 6, 2017Inventors: Rei Kokado, Kensaku Mori, Masanori Takagi, Tetsutaro Hayashi
-
Patent number: 9559351Abstract: A method for producing nickel composite hydroxide particles may include: a first step of producing nuclei including primary particles by controlling the pH of an aqueous solution for nucleation, the aqueous solution for nucleation containing a metal compound having an atomic ratio of metals corresponding to an atomic ratio of metals in the nickel composite hydroxide particles and substantially not containing a metal complex ion-forming agent; and a second step of forming, on an outer surface of each of the nuclei, an outer shell portion including platy primary particles larger than primary particles of the nuclei by controlling the pH of an aqueous solution for particle growth containing the nuclei obtained in the nucleation step.Type: GrantFiled: March 31, 2011Date of Patent: January 31, 2017Assignee: SUMITOMO METAL MINING CO., LTD.Inventors: Kensaku Mori, Rei Kokado, Shin Imaizumi
-
Patent number: 9406928Abstract: Provided is a method for manufacturing the positive electrode active material for nonaqueous electrolyte secondary batteries, the method comprising: a first step, wherein an alkaline solution with a tungsten compound dissolved therein is added to and mixed with a lithium metal composite oxide powder represented by a general formula LizNi1—x—yCoxMyO2 (wherein, 0.10?x?0.35, 0?y?0.35, 0.97?Z?1.20, and M is at least one element selected from Mn, V, Mg, Mo, Nb, Ti, and Al), including primary particles and secondary particles composed of aggregation of the primary particles, and thereby W is dispersed on a surface of the primary particles; and a second step, wherein, by heat treating the mixture of the alkaline solution with the tungsten compound dissolved therein and the lithium metal composite oxide powder, fine particles containing W and Li are formed on a surface of the primary particles.Type: GrantFiled: April 27, 2015Date of Patent: August 2, 2016Assignee: SUMITOMO METAL MINING CO., LTD.Inventors: Rei Kokado, Kensaku Mori
-
Publication number: 20160118656Abstract: The purpose of the present invention is to easily provide at low cost, a cathode active material for non-aqueous electrolyte secondary batteries, which exhibits high particle strength and high weather resistance, while enabling achievement of excellent charge and discharge capacity and excellent output characteristics in cases where the cathode active material is used as a cathode material of a non-aqueous electrolyte secondary battery. A slurry of from 500 g/L to 2000 g/L is formed by adding water to a powder of a lithium nickel composite oxide represented by the general formula (A): LizNi1-x-yCoxMyO2, where 0.10?x?0.20, 0?y?0.10, 0.97?z?1.20, and M represents at least one element selected from among Mn, V, Mg, Mo, Nb, Ti and Al); the slurry is washed with water by stirring; and after filtration, the resulting material is subjected to a heat treatment at a temperature of from 120° C. to 550° C. (inclusive) in an oxygen atmosphere having an oxygen concentration of 80% by volume or more.Type: ApplicationFiled: May 22, 2014Publication date: April 28, 2016Inventors: Tomoko NAKAYAMA, Rei KOKADO, Kensaku MORI
-
Patent number: 9130212Abstract: The present invention aims to provide a positive electrode active material for nonaqueous electrolyte secondary batteries which achieves high output and high capacity when used as a positive electrode material. Disclosed is a method for manufacturing the positive electrode active material for nonaqueous electrolyte secondary batteries, the method comprising: a first step, wherein an alkaline solution with a tungsten compound dissolved therein is added to and mixed with a lithium metal composite oxide powder represented by a general formula LizNi1-x-yCoxMyO2 (wherein, 0.10?x?0.35, 0?y?0.35, 0.97?Z?1.Type: GrantFiled: September 30, 2011Date of Patent: September 8, 2015Assignee: Sumitomo Metal Winning Co., Ltd.Inventors: Rei Kokado, Kensaku Mori
-
Publication number: 20150228974Abstract: Provided is a method for manufacturing the positive electrode active material for nonaqueous electrolyte secondary batteries, the method comprising: a first step, wherein an alkaline solution with a tungsten compound dissolved therein is added to and mixed with a lithium metal composite oxide powder represented by a general formula LizNi1—x—yCoxMyO2 (wherein, 0.10?x?0.35, 0?y?0.35, 0.97?Z?1.20, and M is at least one element selected from Mn, V, Mg, Mo, Nb, Ti, and Al), including primary particles and secondary particles composed of aggregation of the primary particles, and thereby W is dispersed on a surface of the primary particles; and a second step, wherein, by heat treating the mixture of the alkaline solution with the tungsten compound dissolved therein and the lithium metal composite oxide powder, fine particles containing W and Li are formed on a surface of the primary particles.Type: ApplicationFiled: April 27, 2015Publication date: August 13, 2015Inventors: Rei Kokado, Kensaku Mori
-
Publication number: 20150021518Abstract: Provided is a positive-electrode material for nonaqueous-electrolyte secondary batteries, the positive-electrode material being capable of achieving both high capacity and high output when used for a positive electrode for nonaqueous-electrolyte secondary batteries. Also, provided is a method for manufacturing the positive-electrode material for nonaqueous-electrolyte secondary batteries, wherein a lithium metal composite oxide powder is mixed with lithium tungstate, the lithium metal composite oxide powder being represented by a general formula LizNi1-x-yCoxMyO2 (wherein 0.10?x?0.35, 0?y?0.35, 0.97?z?1.20, and M is an addition element and at least one element selected from Mn, V, Mg, Mo, Nb, Ti, and Al) and comprising primary particles and secondary particles composed of aggregation of the primary particles.Type: ApplicationFiled: February 14, 2013Publication date: January 22, 2015Applicant: Sumitomo Metal Mining Co., Ltd.Inventors: Rei Kokado, Kensaku Mori, Masanori Takagi, Tetsutaro Hayashi
-
Publication number: 20130337331Abstract: To provide nickel composite hydroxide particles having a small and uniform particle diameter and a method for producing the same. The method for producing the nickel composite hydroxide particles includes: a nucleation step of producing nuclei including primary particles by controlling a pH of an aqueous solution for nucleation to 11.5 to 13.2 at a liquid temperature of 25° C., the aqueous solution for nucleation containing a metal compound having an atomic ratio of metals corresponding to an atomic ratio of metals in the nickel composite hydroxide particles and substantially not containing a metal complex ion-forming agent; and a particle growth step of forming, on an outer surface of each of the nuclei, an outer shell portion including platy primary particles larger than primary particles of the nuclei by controlling a pH of an aqueous solution for particle growth containing the nuclei obtained in the nucleation step to 9.5 to 11.0 at a liquid temperature of 25° C.Type: ApplicationFiled: March 31, 2011Publication date: December 19, 2013Applicant: SUMITOMO METAL MINING CO., LTD.Inventors: Kensaku Mori, Rei Kokado, Shin Imaizumi
-
Publication number: 20130189581Abstract: The present invention provides a cathode active material for a nonaqueous electrolyte secondary battery with a high capacity, high stability and excellent output characteristics and a method for producing the same, and a nonaqueous electrolyte secondary battery using the cathode active material. The cathode active material for a nonaqueous electrolyte secondary battery is represented by a general formula: LitNi1.x.y.zCoxAlyTizO2 wherein 0.98?t?1.10, 0<x?0.30, 0.03?y?0.15, 0.001?z?0.03; and includes a hexagonal lithium-containing composite oxide with a layer structure of secondary particles having primary particles, in which a titanium-enriched layer is formed on a surface of the primary particles and/or a grain boundary between the primary particles. The titanium-enriched layer on the surface of the primary particles and/or a grain boundary between the primary particles serves as a lithium ion conductor, yielding smooth extraction and insertion of lithium ions.Type: ApplicationFiled: April 1, 2011Publication date: July 25, 2013Applicant: SUMITOMO METAL MINING CO., LTD.Inventors: Shin Imaizumi, Rei Kokado, Kensaku Mori
-
Publication number: 20120276454Abstract: Disclosed are: nickel complex hydroxide particles that have small and uniform particle diameters; and a method by which the nickel complex hydroxide particles can be produced. Specifically disclosed is a method for producing a nickel complex hydroxide by a crystallization reaction, which comprises: a nucleation step in which nucleation is carried out, while controlling an aqueous solution for nucleation containing an ammonium ion supplying material and a metal compound that contains nickel to have a pH of 12.0-13.4 at a liquid temperature of 25° C.; and a particle growth step in which nuclei are grown, while controlling an aqueous solution for particle growth containing the nuclei, which have been formed in the nucleation step, to have a pH of 10.5-12.0 at a liquid temperature of 25° C. In this connection, the pH in the particle growth step is controlled to be less than the pH in the nucleation step.Type: ApplicationFiled: December 2, 2010Publication date: November 1, 2012Inventors: Kensaku Mori, Shin Imaizumi, Rei Kokado