Patents by Inventor Yoshimi Hata
Yoshimi Hata 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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Publication number: 20160218362Abstract: Provided is a positive electrode material for a lithium-ion cell, comprising a lithium metal composite oxide having a layer structure and being represented by the general formula Li1+xMa1?x?yMbyO2 (x=0.10 to 0.33, and y=0 to 0.3; Ma always contains Mn, and contains at least one or more elements selected from Ni and Co, and the Mn content in Ma is 30 to 80% by mass; and Mb is at least one or more elements selected from the group consisting of Al, Mg, Ti, Fe and Nb), wherein the positive electrode material has a primary particle average particle diameter of 1.0 ?m or larger, and a tap density of 1.9 g/cm3 or higher.Type: ApplicationFiled: September 16, 2014Publication date: July 28, 2016Applicant: Mitsui Mining & Smelling Co., Ltd.Inventors: Shinya Kagei, Kyohei Yamaguchi, 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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Patent number: 9337486Abstract: Provided is a novel spinel-type lithium-manganese composite oxide, allowing gas generation amount to be limited for a gas generated via a reaction with an electrolytic solution. Proposed is a spinel-type lithium-manganese composite oxide, wherein, when the spinel-type lithium-manganese composite oxide is placed in an ion-exchanged water at 20° C., stirred for 10 minutes, then, left to stand undisturbed for 2 minutes, separated into a supernatant and a precipitate and recovered, with respect to the “16d-site-to-32e-site inter-atomic distance (100%)” of the spinel-type lithium-manganese composite oxide contained in the precipitate measured by the Rietveld method using the fundamental method, proportionally, the “16d-site-to-32e-site inter-atomic distance” of the spinel-type lithium-manganese composite oxide contained in the supernatant is less than 101.5%.Type: GrantFiled: September 24, 2013Date of Patent: May 10, 2016Assignee: Mitsui Mining & Smelting Co., Ltd.Inventors: Shinya Kagei, Natsumi Shibamura, Yanko Marinov Todorov, Yoshimi Hata
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Publication number: 20160111716Abstract: Provided is a novel positive electrode active material which can effectively suppress the quantity of gas generated by the reaction with an electrolytic solution. Proposed is a positive electrode active material for a lithium secondary battery including positive electrode active material particles obtained by equipping the entire surface or a part of a surface of lithium manganese-containing composite oxide particles (also referred to as the “core particles”) operating at a charging voltage in a region exceeding 4.3 V in a metal Li reference potential with a layer A containing at least titanium (Ti), aluminum (Al), zirconium (Zr), or two or more kinds of these.Type: ApplicationFiled: May 19, 2014Publication date: April 21, 2016Inventors: Shinya Kagei, Natsumi Shibamura, Yanko Marinov Todorov, Yoshimi Hata
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Publication number: 20160093882Abstract: Provided is a lithium secondary battery using a positive electrode active material which operates at a charging voltage in a region exceeding 4.3 V, and a novel positive electrode active material for a lithium secondary battery which can further enhance the output characteristics. Proposed is a positive electrode active material for a lithium secondary battery including positive electrode active material particles obtained by equipping the entire surface or a part of the surface of lithium manganese-containing composite oxide particles (also referred to as the “core particles”) operating at a charging voltage in a region exceeding 4.3 V in a metal Li reference potential with a layer A containing at least Ti, Al, Zr, or two or more kinds of these, and C.Type: ApplicationFiled: May 19, 2014Publication date: March 31, 2016Inventors: Shinya Kagei, Natsumi Shibamura, Yanko Marinov Todorov, 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: 20150255791Abstract: Provided is a novel spinel-type lithium-manganese composite oxide, allowing gas generation amount to be limited for a gas generated via a reaction with an electrolytic solution. Proposed is a spinel-type lithium-manganese composite oxide, wherein, when the spinel-type lithium-manganese composite oxide is placed in an ion-exchanged water at 20° C., stirred for 10 minutes, then, left to stand undisturbed for 2 minutes, separated into a supernatant and a precipitate and recovered, with respect to the “16d-site-to-32e-site inter-atomic distance (100%)” of the spinel-type lithium-manganese composite oxide contained in the precipitate measured by the Rietveld method using the fundamental method, proportionally, the “16d-site-to-32e-site inter-atomic distance” of the spinel-type lithium-manganese composite oxide contained in the supernatant is less than 101.5%.Type: ApplicationFiled: September 24, 2013Publication date: September 10, 2015Inventors: Shinya Kagei, Natsumi Shibamura, Yanko Marinov Todorov, 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: 20150147652Abstract: Provided is a new 5 V class spinel exhibiting an operating potential of 4.5 V or more (5 V class), which can suppress the amount of gas generation during high temperature cycles. Suggested is a manganese spinel-type lithium transition metal oxide represented by formula: Li[NiyMn2-(a+b)-y-zLiaTibMz]O4 (wherein 0?z?0.3, 0.3?y<0.6, and M=at least one or more metal elements selected from the group consisting of Al, Mg, Fe and Co), in which in the above formula, the following relationships are satisfied: a>0, b>0, and 2?b/a?8.Type: ApplicationFiled: April 25, 2013Publication date: May 28, 2015Applicant: Mitsui Mining & Smelting Co., Ltd.Inventors: Natsumi Shibamura, Yanko Marinov Todorov, 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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Patent number: 8728343Abstract: Provided is a lithium ion battery wherein the content of an iron element contained in a positive electrode active material (measured with an ICP emission spectrophotometer) is 10 ppm or more, and magnetic materials having a size of 0.70 times or greater than the thickness of a separator layer are substantially not included in order to provide a lithium ion battery which has small voltage drop during a charge state or under storage at high temperatures.Type: GrantFiled: March 30, 2011Date of Patent: May 20, 2014Assignee: Mitsui Mining & Smelting Co., Ltd.Inventors: Shinya Kagei, Keisuke Miyanohara, Yoshimi Hata, Yasuhiro Ochi
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Patent number: 8703341Abstract: With the object of providing a positive electrode active material for lithium battery that can increase the filling density, can increase the output characteristics, and furthermore, with a small voltage decrease during conservation at high temperature in a charged state, a positive electrode active material for lithium battery is proposed, containing a spinel type (Fd3-m) lithium transition metal oxide represented by general formula Li1+xM2?xO4?? (where M represents a transition metal including Mn, Al and Mg, x represents 0.01 to 0.08 and 0??) and a boron compound, the inter-the atomic distance Li—O of the spinel type lithium transition metal oxide being 1.971 ? to 2.006 ?, and the amount of magnetic substance measured for the positive electrode active material for lithium battery being 600 ppb or less.Type: GrantFiled: March 31, 2010Date of Patent: April 22, 2014Assignee: Mitsui Mining & Smelting Co., Ltd.Inventors: Shinya Kagei, Keisuke Miyanohara, Yoshimi Hata, Yasuhiro Ochi, Kenji Sasaki
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Publication number: 20140010752Abstract: Provided is a new method for producing a positive electrode active material for lithium secondary batteries, by which even in the case of washing a spinel type lithium transition metal oxide with water or the like, the service life characteristics can be further enhanced, and the concentration of magnetic substances can be effectively reduced. Suggested is a method for producing a positive electrode active material for lithium secondary batteries, the method including a water washing step of bringing a powder of a spinel type lithium transition metal oxide into contact with a polar solvent and thereby washing the powder; and a drying step of subsequently drying the powder by heating the powder to 300° C. to 700° C. in an atmosphere containing oxygen.Type: ApplicationFiled: December 19, 2011Publication date: January 9, 2014Applicant: MITSUI MINING & SMELTING CO., LTD.Inventors: Shinya Kagei, Yoshimi Hata, Yasuhiro Ochi
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Publication number: 20130337330Abstract: Regarding Spinel-type lithium manganese-based composite oxide (LMO) to be used as a positive electrode active substance material for lithium battery, a novel LMO is provided, which is capable of maintaining discharge capacity even if charging and discharging are repeated under high temperatures. An LMO in which the crystallite size is 250 nm to 350 nm, the strain is 0.085 or less and the specific surface area increase rate when placed in water at 25° and pH 7 and ultrasonically dispersed at 40 W ultrasonic intensity for 600 seconds is 10.0% or less, can prevent a decrease in the output that accompanies the repetition of charging and discharging while at a high temperature.Type: ApplicationFiled: February 29, 2012Publication date: December 19, 2013Applicant: MITSUI MINING & SMELTING CO., LTD.Inventors: Satoru Taniguchi, Shinya Kagei, Yoshimi Hata
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Publication number: 20130134349Abstract: Provided is a lithium ion battery wherein the content of an iron element contained in a positive electrode active material (measured with an ICP emission spectrophotometer) is 10 ppm or more, and magnetic materials having a size of 0.70 times or greater than the thickness of a separator layer are substantially not included in order to provide a lithium ion battery which has small voltage drop during a charge state or under storage at high temperatures.Type: ApplicationFiled: March 30, 2011Publication date: May 30, 2013Applicant: Mitsui Mining & Smelting Co., Ltd.Inventors: Shinya Kagei, Keisuke Miyanohara, Yoshimi Hata, Yasuhiro Ochi
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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: 20120012776Abstract: With the object of providing a positive electrode active material for lithium battery that can increase the filling density, can increase the output characteristics, and furthermore, with a small voltage decrease during conservation at high temperature in a charged state, a positive electrode active material for lithium battery is proposed, containing a spinel type (Fd3-m) lithium transition metal oxide represented by general formula Li1+xM2-xO4-? (where M represents a transition metal including Mn, Al and Mg, x represents 0.01 to 0.08 and 0??) and a boron compound, the inter-the atomic distance Li—O of the spinel type lithium transition metal oxide being 1.971 ? to 2.006 ?, and the amount of magnetic substance measured for the positive electrode active material for lithium battery being 600 ppb or less.Type: ApplicationFiled: March 31, 2010Publication date: January 19, 2012Applicant: MITSUI MINING & SMELTING CO., LTD.Inventors: Shinya Kagei, Keisuke Miyanohara, Yoshimi Hata, Yasuhiro Ochi, Kenji Sasaki