Patents by Inventor Takamasa Ohtomo
Takamasa Ohtomo 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: 20230011919Abstract: A main object of the present disclosure is to provide an all solid state battery in which occurrence of internal short circuit is inhibited. The present disclosure achieves the object by providing an all solid state battery including, in an order along with a thickness direction, a cathode layer, a solid electrolyte layer and an anode layer; wherein one of the cathode layer and the anode layer is an electrode layer A containing a first polymer electrolyte; the other of the cathode layer and the anode layer is an electrode layer B containing an inorganic solid electrolyte; the solid electrolyte layer contains a second polymer electrolyte; the second polymer electrolyte is a cross-linked polymer to which a polymer component is cross-linked; and in a plan view along with the thickness direction of the all solid state battery, an area of the solid electrolyte layer is larger than an area of the electrode layer A.Type: ApplicationFiled: June 17, 2022Publication date: January 12, 2023Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Shinya SHIOTANI, Takamasa OHTOMO, Fuminori MIZUNO
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Publication number: 20230006261Abstract: To provide an all-solid-state battery that makes it possible to suppress short-circuiting due to a partially missing resin layer of a housing, in the all-solid-state battery formed of sealing an electrode structure in the housing, the housing is provided with a metal layer, the electrode structure includes an electrode stack and an outermost solid electrolyte layer, the electrode stack includes an outermost first current collector layer, the area of the outermost solid electrolyte layer is larger than the area of a flat plate part of the outermost first current collector layer in the stacking direction view, and the outermost solid electrolyte layer is stacked so as to entirely cover the flat plate part of the outermost first current collector layer.Type: ApplicationFiled: June 9, 2022Publication date: January 5, 2023Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Takamasa OHTOMO, Fuminori MIZUNO, Shinya SHIOTANI
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Publication number: 20230006260Abstract: A solid-state battery includes: a first current collector layer; a first current collector tab protruding from an edge of the first current collector layer; a first active material layer laminated on the first current collector layer; a second current collector layer; a second current collector tab protruding from an edge of the second current collector layer; a second active material layer laminated on the second current collector layer; and a solid electrolyte layer arranged between the first active material layer and the second active material layer and including a polymer electrolyte, wherein the solid electrolyte layer is arranged so as to cover end surfaces of the first current collector layer and the first active material layer, and the first current collector tab protrudes through the solid electrolyte layer.Type: ApplicationFiled: May 24, 2022Publication date: January 5, 2023Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Takamasa OHTOMO, Fuminori MIZUNO, Shinya SHIOTANI
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Publication number: 20230006243Abstract: A solid-state battery includes: a first current collector layer having a first current collector tab protruding from one side of a quadrilateral; a first active material layer laminated on the first current collector layer; a second current collector layer having a second current collector tab protruding from one side of a quadrilateral; a second active material layer laminated on the second current collector layer; and a solid electrolyte layer arranged between the first active material layer and the second active material layer and including a polymer electrolyte, wherein, in three sides other than the one side where the first current collector tab is arranged, the solid electrolyte layer is arranged so as to cover end surfaces of the first current collector layer and the first active material layer.Type: ApplicationFiled: May 24, 2022Publication date: January 5, 2023Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Fuminori MIZUNO, Shinya SHIOTANI, Takamasa OHTOMO
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Publication number: 20220336850Abstract: A main object of the present disclosure is to provide a battery superior in safety against heating. The present disclosure achieves the object by providing a battery comprising cathode current collector, a cathode active material layer, a solid electrolyte layer, an anode active material layer, and an anode current collector, in this order along a thickness direction, and the anode current collector includes a coating layer including an oxide active material, on a surface of the anode active material layer side, the solid electrolyte layer includes a first solid electrolyte layer, and a second solid electrolyte layer placed between the first solid electrolyte layer and the anode active material layer, the first solid electrolyte layer includes a halide solid electrolyte, and the second solid electrolyte layer includes a sulfide solid electrolyte.Type: ApplicationFiled: April 13, 2022Publication date: October 20, 2022Inventors: Yuhi YAMANO, Kunimitsu YAMAMOTO, Yuki ARAI, Takamasa OHTOMO, Yasunari SUGITA, Tatsuya OSHIMA
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Publication number: 20220173404Abstract: A main object of the present disclosure is to provide an all solid state battery of which calorific value is little even when, for example, internal short circuit occurs. The present disclosure achieves the object by providing an all solid state battery comprising a cathode active material layer and a low meltability cathode current collector, wherein the low meltability cathode current collector contains a metal element, and a melting point of the low meltability cathode current collector is 170° C. or more and 420° C. or less.Type: ApplicationFiled: November 15, 2021Publication date: June 2, 2022Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventor: Takamasa OHTOMO
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Publication number: 20220173432Abstract: A main object of the present disclosure is to provide an all solid state battery of which calorific value is little even when internal short circuit occurs due to factors such as pricking of a conductive member. The present disclosure achieves the object by providing an all solid state battery comprising a cathode active material layer and a high rigidity cathode current collector, wherein the high rigidity cathode current collector contains a metal element, and Young's modulus of the high rigidity cathode current collector is 96.5 GPa or more.Type: ApplicationFiled: November 22, 2021Publication date: June 2, 2022Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventor: Takamasa Ohtomo
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Patent number: 10707518Abstract: A method of producing a sulfide solid electrolyte material includes: forming an intermediate having crosslinking sulfur but no Li2S, by vitrifying, in a first vitrification process, a starting material composition obtained by mixing Li2S and a sulfide of a group 14 or group 15 element such that a proportion of Li2S with respect to the sum total of the Li2S and the sulfide of a group 14 or group 15 element is smaller than a proportion of Li2S required for the sulfide solid electrolyte material to obtain an ortho composition; and eliminating the crosslinking sulfur by vitrifying, in a second vitrification process, an intermediate-containing composition resulting from mixing a bond cleaving compound, which cleaves a bond of the crosslinking sulfur, with the intermediate.Type: GrantFiled: May 21, 2018Date of Patent: July 7, 2020Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Takamasa Ohtomo, Koji Kawamoto, Shigenori Hama, Yuki Kato
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Patent number: 10355308Abstract: The present invention aims to provide a sulfide solid electrolyte material with favorable ion conductivity, in which charge and discharge efficiency may be inhibited from decreasing. The object is attained by providing a sulfide solid electrolyte material, including: a Li element; a P element; and a S element, characterized in that the material has a peak at a position of 2?=30.21°±0.50° in X-ray diffraction measurement using a CuK? ray, and the sulfide solid electrolyte material does not substantially include a metallic element belonging to the third group to the sixteenth group.Type: GrantFiled: May 29, 2014Date of Patent: July 16, 2019Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Ryoji Kanno, Masaaki Hirayama, Yuki Kato, Takamasa Ohtomo, Hisatsugu Yamasaki
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Patent number: 10305140Abstract: An object of the present invention is to provide a sulfide solid electrolyte material having satisfactory ion conductivity. In the present invention, the above object is solved by providing a sulfide solid electrolyte material comprising a Li element, a Si element, a P element, a S element, and an X element (in which X represents at least one of F, Cl, Br and I), the sulfide solid electrolyte material having a crystal phase B having a peak at the position of 2?=30.12°±1.00° measured by X-ray diffractometry using CuK? ray.Type: GrantFiled: May 13, 2015Date of Patent: May 28, 2019Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Yuki Kato, Takamasa Ohtomo
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Patent number: 10270135Abstract: An all-solid-state battery that makes it possible to improve the cycling properties is provided. The all-solid-state battery includes an anode; a cathode; a solid electrolyte layer that is arranged between the anode and the cathode; an anode collector that is connected to the anode; and a cathode collector that is connected to the cathode. In the all-solid-state battery, a metal layer is arranged between the anode and the anode collector and/or between the cathode and the cathode collector, and metal that does not undergo an electrochemical reaction with metal ions under a potential environment where an active material stores and releases the metal ions, and whose percent elongation is no less than 22% is used for the metal layer.Type: GrantFiled: September 12, 2014Date of Patent: April 23, 2019Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Hisatsugu Yamasaki, Yuki Kato, Takamasa Ohtomo, Masatsugu Kawakami
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Patent number: 10193185Abstract: The main object of the present invention is to provide a sulfide solid electrolyte material with high Li ion conductivity. The present invention solves the problem by providing a sulfide solid electrolyte material comprising an ion conductor with an ortho-composition, and LiI, characterized in that the sulfide solid electrolyte material is glass with a glass transition point.Type: GrantFiled: October 6, 2015Date of Patent: January 29, 2019Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Takamasa Ohtomo, Koji Kawamoto, Shigenori Hama, Yasushi Tsuchida, Yuki Kato
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Patent number: 10141602Abstract: A problem of the present invention is to provide a lithium solid battery in which generation of short-circuits caused by dendrite is inhibited. The present invention solves the problem by providing a lithium solid battery comprising a solid electrolyte layer having a sulfide glass containing an ion conductor which has a Li element, a P element and a S element, and having an average pore radius calculated by mercury press-in method being 0.0057 ?m or less.Type: GrantFiled: December 11, 2014Date of Patent: November 27, 2018Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Takamasa Ohtomo, Hisatsugu Yamasaki, Hiroshi Nagase
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Publication number: 20180269521Abstract: A method of producing a sulfide solid electrolyte material includes: forming an intermediate having crosslinking sulfur but no Li2S, by vitrifying, in a first vitrification process, a starting material composition obtained by mixing Li2S and a sulfide of a group 14 or group 15 element such that a proportion of Li2S with respect to the sum total of the Li2S and the sulfide of a group 14 or group 15 element is smaller than a proportion of Li2S required for the sulfide solid electrolyte material to obtain an ortho composition; and eliminating the crosslinking sulfur by vitrifying, in a second vitrification process, an intermediate-containing composition resulting from mixing a bond cleaving compound, which cleaves a bond of the crosslinking sulfur, with the intermediate.Type: ApplicationFiled: May 21, 2018Publication date: September 20, 2018Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Takamasa OHTOMO, Koji KAWAMOTO, Shigenori HAMA, Yuki KATO
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Patent number: 10008735Abstract: A method of producing a sulfide solid electrolyte material includes: forming an intermediate having crosslinking sulfur but no Li2S, by vitrifying, in a first vitrification process, a starting material composition obtained by mixing Li2S and a sulfide of a group 14 or group 15 element such that a proportion of Li2S with respect to the sum total of the Li2S and the sulfide of a group 14 or group 15 element is smaller than a proportion of Li2S required for the sulfide solid electrolyte material to obtain an ortho composition; and eliminating the crosslinking sulfur by vitrifying, in a second vitrification process, an intermediate-containing composition resulting from mixing a bond cleaving compound, which cleaves a bond of the crosslinking sulfur, with the intermediate.Type: GrantFiled: December 15, 2010Date of Patent: June 26, 2018Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Takamasa Ohtomo, Koji Kawamoto, Shigenori Hama, Yuki Kato
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Patent number: 9972826Abstract: A main object of the present invention is to provide a method for producing a cathode active material for a solid state battery, which is capable of reducing resistance. The present invention solves the problem by providing a method for producing a cathode active material for a solid state battery comprising steps of: a coating step of coating a coating material represented by LixPOy (2?x?4, 3?y?5) on a surface of a cathode active material containing an Ni element and being an oxide by using a sputtering method; and a heat-treating step of forming a coating portion in such a manner that the cathode active material coated with the coating material is heat-treated within a range of 400° C. to 650° C. to diffuse the Ni element into the coating material.Type: GrantFiled: February 26, 2016Date of Patent: May 15, 2018Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Masatsugu Kawakami, Takamasa Ohtomo, Yuki Kato, Hisatsugu Yamasaki
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Patent number: 9954248Abstract: An object of the present invention is to provide a solid lithium secondary battery in which occurrence of short-circuit is suppressed during charging. The object is attained by providing a solid lithium secondary battery comprising an anode current collector, a solid electrolyte layer, a cathode active material layer, and a cathode current collector in this order, wherein the solid electrolyte layer is provided on a surface of the anode current collector, the solid electrolyte layer contains a sulfide solid electrolyte particle, a surface shape of the solid electrolyte layer, which faces the anode current collector, is formed in correspondence with a surface shape of the anode current collector, and 10-point average roughness (Rz) of the surface of the anode current collector on a solid electrolyte layer side, and 10-point average roughness (Rz) of a surface of the solid electrolyte layer on an anode current collector side are in a range of 1.8 ?m to 2.5 ?m, respectively.Type: GrantFiled: July 27, 2015Date of Patent: April 24, 2018Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Takamasa Ohtomo, Yuki Kato
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Patent number: 9929403Abstract: A method of producing an active material powder includes (i) an attachment step of obtaining a powder including an active material particle, which stores and releases lithium ions at a potential of 4.5 V or higher based on Li, and a coating layer precursor, which is attached to a surface of the active material particle, by attaching an alkoxide solution containing lithium ions and niobium ions to the surface of the active material particle and drying the attached alkoxide solution; and (ii) a heating step of forming a coating layer on the surface of the active material particle by heating the powder obtained in the attachment step to be within a temperature range of 120° C. to 200° C.Type: GrantFiled: March 6, 2015Date of Patent: March 27, 2018Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Yuki Kato, Takamasa Ohtomo, Hisatsugu Yamasaki, Masatsugu Kawakami
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Patent number: 9819207Abstract: Provided is an all solid state battery system with a high energy density. The all solid state battery system comprises an all solid state battery, and a discharging control unit that controls discharging of the all solid state battery, a cathode active material layer contains a cathode active material particle, and a sulfide solid electrolyte particle, and a ratio (T/t) of an actual thickness “T” of the cathode active material layer to an effective thickness “t” of the cathode active material layer which is calculated by the following Expression satisfies a relationship of 0.01?T/t?0.15; t=V/i×?? (in which, V represents an operation voltage width (V), i represents a current density (mA/cm2) during discharging, and ?? represents effective Li ion conductivity (S/cm) of the cathode active material layer).Type: GrantFiled: July 24, 2015Date of Patent: November 14, 2017Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Yuki Kato, Takamasa Ohtomo
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Patent number: 9748603Abstract: A sulfide solid electrolyte material includes Li, K, Si, P and S elements; a peak at 2?=29.58°±0.50° and not having a peak at a position of 2?=27.33°±0.50° in X-ray diffraction measurement using a CuK? ray, or when a diffraction intensity at the peak of 2?=29.58°±0.50° is regarded as IA and a diffraction intensity at the peak of 2?=27.33°±0.50° is regarded as IB having a peak at the position of 2?=27.33°±0.50°, a value of IB/IA is less than 1; a P element molar fraction (P/(Si+P)) to a Si element total and the P element satisfies 0.5?P/(Si+P)?0.7, and a K element molar fraction (K/(Li+K)) to a Li element total and the K element satisfies 0<K/(Li+K)?0.1.Type: GrantFiled: September 17, 2014Date of Patent: August 29, 2017Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Hisatsugu Yamasaki, Yuki Kato, Takamasa Ohtomo, Masatsugu Kawakami