Patents by Inventor Norihiko Miyashita
Norihiko Miyashita 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: 20240088429Abstract: A battery includes a positive electrode, a negative electrode, and a solid electrolyte layer arranged between the positive electrode and the negative electrode. The positive electrode contains a positive electrode active material containing a lithium (Li) element, a sulfur (S) element, and a phosphorus (P) element and containing a crystal phase with an argyrodite-type crystal structure. The total amount of a nickel (Ni) element and a cobalt (Co) element contained in the positive electrode active material is 0.1% by mass or less. The total amount of rare metals (excluding the lithium (Li) element) contained in the positive electrode active material is preferably 0.1% by mass or less. The solid electrolyte preferably contains a lithium (Li) element, a sulfur (S) element, and a phosphorus (P) element and contains a crystal phase with an argyrodite-type crystal structure.Type: ApplicationFiled: November 11, 2022Publication date: March 14, 2024Inventor: Norihiko MIYASHITA
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Publication number: 20230343996Abstract: A method is provided that can produce lithium sulfide with high purity. The method for producing lithium sulfide includes: a first step of reducing a raw material containing lithium (Li) and sulfur (S) elements, using a reductant containing a carbon (C) element, thereby obtaining an intermediate; and a second step of reducing the intermediate using a reducing gas, thereby obtaining lithium sulfide. It is preferable that the first step is performed in an inert gas atmosphere. It is also preferable that the first step is performed at a temperature of from 700° C. to 850° C. It is also preferable that the second step is performed at a temperature of from 830° C. to 930° C.Type: ApplicationFiled: July 2, 2021Publication date: October 26, 2023Inventors: Masaaki INAMURA, Takahiro ITO, Norihiko MIYASHITA
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Publication number: 20230278881Abstract: An active material contains: a compound containing lithium (Li) element, sulfur (S) element, and an element M and containing a crystalline phase having an argyrodite-type crystal structure; and a conductive material dispersed on the surface or in the interior of particles of the compound. The element M represents phosphorus (P) element or the like. The active material is a composite material of the compound and the conductive material. It is preferable that the conductive material is a carbon material or a metallic material. It is also preferable that the content of the lithium element in the active material is from 10 to 25% by mass.Type: ApplicationFiled: August 27, 2021Publication date: September 7, 2023Inventor: Norihiko MIYASHITA
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Patent number: 11699809Abstract: Provided is a sulfide-based solid electrolyte which is capable of suppressing the generation of hydrogen sulfide caused by reaction with moisture even when in contact with dry air in a dry room or the like, and capable of maintaining lithium ion conductivity. Proposed is a sulfide-based solid electrolyte for a lithium secondary battery, wherein the surface of a compound containing lithium, phosphorus, sulfur, and halogen, and having a cubic argyrodite-type crystal structure is coated with a compound containing lithium, phosphorus, and sulfur, and having a non-argyrodite-type crystal structure.Type: GrantFiled: May 16, 2017Date of Patent: July 11, 2023Assignee: Mitsui Mining & Smelting Co., Ltd.Inventors: Hideo Uesugi, Norihiko Miyashita, Hitohiko Ide, Takahiro Ito, Takashi Chikumoto, Takashi Muranaka
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Patent number: 11631887Abstract: Provided is a sulfide-based solid electrolyte comprising lithium, phosphorus, sulfur, and a halogen, as a novel solid electrolyte capable of suppressing generation of hydrogen sulfide and securing ionic conductivity. The solid electrolyte is characterized by comprising Li7?aPS6?aHaa (wherein Ha represents a halogen, and “a” satisfies 0.2<a?1.8) having an argyrodite-type crystal structure, and Li3PS4, wherein, in an X-ray diffraction (XRD) pattern obtained through measurement by an X-ray diffraction method, the ratio of the peak intensity of a peak appearing at a position in a range of diffraction angle 2?=26.0° to 28.8° derived from Li3PS4, relative to the peak intensity of a peak appearing at a position in a range of diffraction angle 2?=24.9° to 26.3° derived from the argyrodite-type crystal structure, is 0.04 to 0.3.Type: GrantFiled: December 26, 2018Date of Patent: April 18, 2023Assignee: Mitsui Mining & Smelting Co., Ltd.Inventors: Yuki Nakayama, Tsukasa Takahashi, Takahiro Ito, Norihiko Miyashita
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Patent number: 11618678Abstract: A method for producing a sulfide solid electrolyte includes a firing step of firing a raw material containing Li2S in a hydrogen sulfide-containing atmosphere at a temperature of 300° C. or higher, Li2S having a purity of 50 to 90% by mass at the start of firing. The Li2S may contain impurities including at least one of LiOH, Li2O, LiHCO3, and Li2CO3. In the firing step, it is preferable that a concentration of a hydrogen sulfide in the hydrogen sulfide-containing atmosphere is 50 volume % or more. It is preferable that the raw material further contains P2S5 and LiX (X represents at least one type of elemental halogen), and the sulfide solid electrolyte has an argyrodite-type crystal structure.Type: GrantFiled: March 18, 2020Date of Patent: April 4, 2023Inventors: Takahiro Ito, Masaru Hyakutake, Norihiko Miyashita
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Publication number: 20220098039Abstract: A method for producing a sulfide solid electrolyte includes a firing step of firing a raw material containing Li2S in a hydrogen sulfide-containing atmosphere at a temperature of 300° C. or higher, Li2S having a purity of 50 to 90% by mass at the start of firing. The Li2S may contain impurities including at least one of LiOH, Li2O, LiHCO3, and Li2CO3. In the firing step, it is preferable that a concentration of a hydrogen sulfide in the hydrogen sulfide-containing atmosphere is 50 volume % or more. It is preferable that the raw material further contains P2S5 and LiX (X represents at least one type of elemental halogen), and the sulfide solid electrolyte has an argyrodite-type crystal structure.Type: ApplicationFiled: March 18, 2020Publication date: March 31, 2022Inventors: Takahiro ITO, Masaru HYAKUTAKE, Norihiko MIYASHITA
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Publication number: 20210075058Abstract: Provided is a sulfide-based solid electrolyte comprising lithium, phosphorus, sulfur, and a halogen, as a novel solid electrolyte capable of suppressing generation of hydrogen sulfide and securing ionic conductivity. The solid electrolyte is characterized by comprising Li7?aPS6?aHaa (wherein Ha represents a halogen, and “a” satisfies 0.2<a?1.8) having an argyrodite-type crystal structure, and Li3PS4, wherein, in an X-ray diffraction (XRD) pattern obtained through measurement by an X-ray diffraction method, the ratio of the peak intensity of a peak appearing at a position in a range of diffraction angle 2?=26.0° to 28.8° derived from Li3PS4, relative to the peak intensity of a peak appearing at a position in a range of diffraction angle 2?=24.9° to 26.3° derived from the argyrodite-type crystal structure, is 0.04 to 0.3.Type: ApplicationFiled: December 26, 2018Publication date: March 11, 2021Inventors: Yuki Nakayama, Tsukasa Takahashi, Takahiro Ito, Norihiko Miyashita
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Patent number: 10644348Abstract: Provided is a novel crystalline solid electrolyte which can be used as a dispersion medium when slurrying polar solvents such as NMP, acetone, and DMF, and for which a decrease in conductivity when the crystalline solid electrolyte is immersed in said solvents can be suppressed. Proposed is a crystalline solid electrolyte represented by Compositional Formula: LixSiyPzSaHaw (here, Ha includes one or two or more of Br, Cl, I, and F, and 2.4<(x?y)/(y+z)<3.3), in which the content of S is 55 to 73% by mass, the content of Si is 2 to 11% by mass, and the content of a Ha element is 0.02% by mass or more.Type: GrantFiled: February 28, 2014Date of Patent: May 5, 2020Assignee: Mitsui Mining & Smelting Co., Ltd.Inventors: Tsutomu Higuchi, Norihiko Miyashita, Kenji Matsuzaki, Takahiro Ito, Kenji Tomonari
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Publication number: 20190312304Abstract: Provided is a sulfide-based solid electrolyte which is capable of suppressing the generation of hydrogen sulfide caused by reaction with moisture even when in contact with dry air in a dry room or the like, and capable of maintaining lithium ion conductivity. Proposed is a sulfide-based solid electrolyte for a lithium secondary battery, wherein the surface of a compound containing lithium, phosphorus, sulfur, and halogen, and having a cubic argyrodite-type crystal structure is coated with a compound containing lithium, phosphorus, and sulfur, and having a non-argyrodite-type crystal structure.Type: ApplicationFiled: May 16, 2017Publication date: October 10, 2019Inventors: Hideo Uesugi, Norihiko Miyashita, Hitohiko Ide, Takahiro Ito, Takashi Chikumoto, Takashi Muranaka
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Patent number: 9899701Abstract: Proposed is a new sulfide-based solid electrolyte for lithium ion batteries, the sulfide-based solid electrolyte relating to a compound that has a cubic argyrodite type crystal structure and is represented by Li7-x-2yPS6-x-yClx, and having excellent water resistance and oxidation resistance. Proposed is a sulfide-based solid electrolyte for lithium ion batteries, the sulfide-based solid electrolyte containing a compound that has a cubic argyrodite type crystal structure and is represented by compositional formula (1): Li7-x-2yPS6-x-yClx, in which compositional formula, conditions: 0.8?x?1.7 and 0<y??0.25x+0.5 are satisfied.Type: GrantFiled: June 15, 2015Date of Patent: February 20, 2018Assignee: Mitsui Mining & Smelting Co., Ltd.Inventors: Norihiko Miyashita, Takashi Chikumoto, Hideaki Matsushima, Kenji Matsuzaki
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Patent number: 9899702Abstract: Relating to a sulfide-based solid electrolyte compound for lithium ion batteries which has a cubic argyrodite-type crystal structure, to provide a compound which can suppress a generation amount of hydrogen sulfide when being left to stand in the air and which can maintain high conductivity even when being left to stand in dry air. Proposed is a sulfide-based solid electrolyte compound for lithium ion batteries containing a crystal phase of the cubic argyrodite-type crystal structure and represented by a composition formula (1): Li7?x+yPS6?xClx+y, wherein x and y in the composition formula (1) satisfy 0.05?y?0.9 and ?3.0x+1.8?y??3.0x+5.7.Type: GrantFiled: December 25, 2015Date of Patent: February 20, 2018Assignee: Mitsui Mining & Smelting Co., Ltd.Inventors: Norihiko Miyashita, Takashi Chikumoto, Tatsuya Aoki, Hitohiko Ide, Kenji Matsuzaki
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Publication number: 20170352916Abstract: Relating to a sulfide-based solid electrolyte compound for lithium ion batteries which has a cubic argyrodite-type crystal structure, to provide a compound which can suppress a generation amount of hydrogen sulfide when being left to stand in the air and which can maintain high conductivity even when being left to stand in dry air. Proposed is a sulfide-based solid electrolyte compound for lithium ion batteries containing a crystal phase of the cubic argyrodite-type crystal structure and represented by a composition formula (1): Li7-x+yPS6-xClx+y, wherein x and y in the composition formula (1) satisfy 0.05?y?0.9 and ?3.0x+1.8?y??3.0x+5.7.Type: ApplicationFiled: December 25, 2015Publication date: December 7, 2017Inventors: Norihiko Miyashita, Takashi Chikumoto, Tatsuya Aoki, Hitohiko Ide, Kenji Matsuzaki
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Patent number: 9812734Abstract: Provided is a solid electrolyte with which charge/discharge efficiency and cycle characteristics can be increased by reducing the electron conductivity of a compound which has a cubic crystal structure belonging to a space group F-43m, and is represented by Compositional Formula: Li7-xPS6-xHax (Ha is Cl or Br). Proposed is a sulfide-based solid electrolyte for a lithium ion battery, which includes a compound having a cubic crystal structure belonging to a space group F-43m, and being represented by Compositional Formula: Li7-xPS6-xHax (Ha is Cl or Br), in which x in the above Compositional Formula is 0.2 to 1.8, and the value of the lightness L* thereof in the L*a*b* color system is 60.0 or more.Type: GrantFiled: June 23, 2014Date of Patent: November 7, 2017Assignee: Mitsui Mining & Smelting Co., Ltd.Inventors: Norihiko Miyashita, Takashi Chikumoto, Hideaki Matsushima, Kenji Matsuzaki
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Publication number: 20170222257Abstract: Proposed is a new sulfide-based solid electrolyte for lithium ion batteries, the sulfide-based solid electrolyte relating to a compound that has a cubic argyrodite type crystal structure and is represented by Li7-x-2yPS6-x-yClx, and having excellent water resistance and oxidation resistance. Proposed is a sulfide-based solid electrolyte for lithium ion batteries, the sulfide-based solid electrolyte containing a compound that has a cubic argyrodite type crystal structure and is represented by compositional formula (1) : Li7-x-2yPS6-x-yClx, in which compositional formula, conditions: 0.8 ?x?1.7 and 0<y??0.25x+0.5 are satisfied.Type: ApplicationFiled: June 15, 2015Publication date: August 3, 2017Inventors: Norihiko Miyashita, Takashi Chikumoto, Hideaki Matsushima, Kenji Matsuzaki
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Publication number: 20160164136Abstract: Provided is a novel crystalline solid electrolyte which can be used as a dispersion medium when slurrying polar solvents such as NMP, acetone, and DMF, and for which a decrease in conductivity when the crystalline solid electrolyte is immersed in said solvents can be suppressed. Proposed is a crystalline solid electrolyte represented by Compositional Formula: LixSiyPzSaHaw (here, Ha includes one or two or more of Br, Cl, I, and F, and 2.4<(x?y)/(y+z)<3.3), in which the content of S is 55 to 73% by mass, the content of Si is 2 to 11% by mass, and the content of a Ha element is 0.02% by mass or more.Type: ApplicationFiled: February 28, 2014Publication date: June 9, 2016Inventors: Tsutomu HIGUCHI, Norihiko MIYASHITA, Kenji MATSUZAKI, Takahiro ITO, Kenji TOMONARI
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Publication number: 20160156064Abstract: Provided is a solid electrolyte with which charge/discharge efficiency and cycle characteristics can be increased by reducing the electron conductivity of a compound which has a cubic crystal structure belonging to a space group F-43m, and is represented by Compositional Formula: Li7-xPS6-xHax (Ha is Cl or Br). Proposed is a sulfide-based solid electrolyte for a lithium ion battery, which includes a compound having a cubic crystal structure belonging to a space group F-43m, and being represented by Compositional Formula: Li7-xPS6-xHax (Ha is Cl or Br), in which x in the above Compositional Formula is 0.2 to 1.8, and the value of the lightness L* thereof in the L*a*b* color system is 60.0 or more.Type: ApplicationFiled: June 23, 2014Publication date: June 2, 2016Inventors: Norihiko Miyashita, Takashi Chikumoto, Hideaki Matsushima, Kenji Matsuzaki
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Publication number: 20140037535Abstract: Provided is a method for producing lithium sulfide based on a new dry method, by which lithium sulfide can be produced more easily at lower cost, and fine pulverization of lithium sulfide can be attempted. Suggested is a method for producing lithium sulfide (Li2S) for a solid electrolyte material for lithium ion batteries that is used as a solid electrolyte material for lithium ion batteries, the method including bringing lithium carbonate powder into contact with a gas containing sulfur (S) in a dry state, simultaneously heating the lithium carbonate, and thereby obtaining lithium sulfide powder.Type: ApplicationFiled: April 11, 2012Publication date: February 6, 2014Applicant: MITSUI MINING & SMELTING CO., LTD.Inventor: Norihiko Miyashita
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Publication number: 20110011731Abstract: To provide a method for producing a method for producing a low-resistance and high-transmittance indium-oxide-based transparent conductive film readily obtained through crystallization, the method employing an amorphous film which can easily be patterned through etching with a weak acid.Type: ApplicationFiled: March 28, 2008Publication date: January 20, 2011Applicant: MITSUI MINING & SMELTING CO., LTDInventors: Seiichiro Takahashi, Norihiko Miyashita
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Patent number: 7790644Abstract: The invention provides a zinc-oxide-based target, having excellent environmental durability. The target contains zinc oxide as a predominant component, and both titanium (Ti) and gallium (Ga) in amounts of 1.1 at. % or more and 4.5 at. % or more, respectively.Type: GrantFiled: September 17, 2009Date of Patent: September 7, 2010Assignee: Mitsui Mining & Smelting Co., Ltd.Inventors: Seiichiro Takahashi, Seiji Moriuchi, Norihiko Miyashita, Makoto Ikeda