Patents by Inventor Mitsutoshi Otaki
Mitsutoshi Otaki 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: 20220344706Abstract: A main object of the present disclosure is to provide an all solid state battery in which occurrence of short circuit is inhibited. The present disclosure achieves the object by providing an all solid state battery comprising an anode including at least an anode current collector, a cathode, and a solid electrolyte layer arranged between the anode and the cathode; wherein a protective layer containing a Mg-containing particle that contains at least Mg, and also containing a polymer, is arranged between the anode current collector and the solid electrolyte layer; the solid electrolyte layer contains a solid electrolyte in a granular shape; and when X designates an average particle size D50 of the solid electrolyte and Y designates an average thickness of the solid electrolyte layer, X/Y is 0.0125 or more and 0.02 or less.Type: ApplicationFiled: April 20, 2022Publication date: October 27, 2022Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Ximeng Li, Masumi Sato, Sakina Kaneko, Tomoya Matsunaga, So Yubuchi, Mitsutoshi Otaki, Hideaki Nishimura, Satoshi Wakasugi, Shohei Kawashima, Jun Yoshida
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Publication number: 20220344791Abstract: A main object of the present disclosure is to provide an all solid state battery in which occurrence of short circuit is inhibited. The present disclosure achieves the object by providing an all solid state battery comprising an anode including at least an anode current collector, a cathode, and a solid electrolyte layer arranged between the anode and the cathode; wherein a protective layer containing a Mg-containing particle that contains at least Mg, and also containing a polymer, is arranged between the anode current collector and the solid electrolyte layer.Type: ApplicationFiled: April 20, 2022Publication date: October 27, 2022Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Ximeng Li, Masumi Sato, Sakina Kaneko, Tomoya Matsunaga, Mitsutoshi Otaki, Satoshi Wakasugi, Hideaki Nishimura, So Yubuchi, Shohei Kawashima, Jun Yoshida
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Publication number: 20220344666Abstract: A main object of the present disclosure is to provide an all solid state battery in which occurrence of short circuit is inhibited. The present disclosure achieves the object by providing an all solid state battery including an anode including at least an anode current collector, a cathode, and a solid electrolyte layer arranged between the anode and the cathode; wherein a protective layer containing a Mg-containing particle that contains at least Mg, and also contains a polymer, is arranged between the anode current collector and the solid electrolyte layer; and a contacting area rate in an interface between the solid electrolyte layer and the protective layer is 50% or more.Type: ApplicationFiled: April 19, 2022Publication date: October 27, 2022Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Ximeng Li, Masumi Sato, Sakina Kaneko, Tomoya Matsunaga, Mitsutoshi Otaki, Satoshi Wakasugi, Hideaki Nishimura, So Yubuchi, Shohei Kawashima, Jun Yoshida
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Publication number: 20220320580Abstract: To reduce an electric resistance of an all-solid-state battery, the all-solid-state battery includes: an anode active material layer; a cathode active material layer; and a solid electrolyte layer disposed between the anode active material layer and the cathode active material layer, wherein the cathode active material layer contains S, Li2S, P2S5, and a single-walled carbon nanotube.Type: ApplicationFiled: March 22, 2022Publication date: October 6, 2022Inventors: Hideaki NISHIMURA, Jun YOSHIDA, Mitsutoshi OTAKI, Satoshi WAKASUGI, Shoshei KAWASHIMA, So YUBUCHI
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Publication number: 20220320480Abstract: To improve the capacity of an all-solid-state battery, a method of manufacturing an all-solid-state battery having a cathode that contains sulfur include: performing initial charge and discharge separately at least in three cycles until a capacity of the battery reaches a design capacity, wherein a charge discharge capacity in a first cycle is at most 30% of the design capacity, and charge and discharge in a second cycle and after are performed, so that a charge discharge capacity in an n-th cycle is increased at least 1.15 times as much as a charge discharge capacity in an (n-1)-th cycle.Type: ApplicationFiled: March 21, 2022Publication date: October 6, 2022Inventors: Ximeng LI, Masumi SATO, Sakina KANEKO, Tomoya MATSUNAGA, Satoshi WAKASUGI, Hideaki NISHIMURA, Mitsutoshi OTAKI, So YUBUCHI, Shohei KAWASHIMA, Jun YOSHIDA
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Patent number: 11387485Abstract: Disclosed is an all-solid-state lithium ion secondary battery being excellent in cycle characteristics. The all-solid-state lithium ion secondary battery may be an all-solid-state lithium ion secondary battery, wherein an anode comprises an anode active material, an electroconductive material and a solid electrolyte; wherein the anode active material comprises at least one active material selected from the group consisting of a metal that is able to form an alloy with Li, an oxide of the metal, and an alloy of the metal and Li; and wherein a bulk density of the solid electrolyte is 0.3 g/cm3 or more and 0.6 g/cm3 or less.Type: GrantFiled: April 13, 2018Date of Patent: July 12, 2022Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Norihiro Ose, Hajime Hasegawa, Mitsutoshi Otaki, Yusuke Kintsu
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Publication number: 20220190315Abstract: A main object of the present disclosure is to provide an all solid state battery with excellent capacity durability when restraining pressure is not applied or even when low restraining pressure is applied thereto. The present disclosure achieves the object by providing an all solid state battery comprising layers in the order of a cathode layer, a solid electrolyte layer, and an anode layer; wherein the anode layer contains an anode active material including a silicon clathrate II type crystal phase; restraining pressure of 0 MPa or more and less than 5 MPa is applied to the all solid state battery in a layering direction; and a specific surface area of the anode active material is 8 m2/g or more and 17 m2/g or less.Type: ApplicationFiled: November 23, 2021Publication date: June 16, 2022Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Mitsutoshi OTAKI, Jun YOSHIDA
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Publication number: 20220190329Abstract: A main object of the present disclosure is to provide an all solid state battery with excellent capacity durability when restraining pressure is not applied or even when low restraining pressure is applied thereto. The present disclosure achieves the object by providing an all solid state battery comprising layers in the order of a cathode layer, a solid electrolyte layer, and an anode layer; wherein the anode layer contains an anode active material including a silicon clathrate II type crystal phase; restraining pressure of 0 MPa or more and less than 5 MPa is applied to the all solid state battery in a layering direction; and when a capacity ratio of anode capacity with respect to cathode capacity is regarded as A, the capacity ratio A is 2.5 or more and 4.8 or less.Type: ApplicationFiled: November 22, 2021Publication date: June 16, 2022Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Mitsutoshi OTAKI, Jun YOSHIDA
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Publication number: 20220149360Abstract: A main object of the present disclosure is to provide an active material wherein the volume variation of an electrode layer during charge/discharge may be suppressed. The present disclosure achieves the object by providing an active material used for an all solid state battery, the active material comprising at least Si, and in infrared spectrum, when a maximum peak intensity in 900 cm?1 or more and 950 cm?1 or less is regarded as I1, and a maximum peak intensity in 1000 cm?1 or more and 1100 cm?1 or less is regarded as I2, the I1 and the I2 satisfy 0.55?I2/I1?1.0, and 0.01?I1.Type: ApplicationFiled: November 8, 2021Publication date: May 12, 2022Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Mitsutoshi Otaki, Jun Yoshida, Tetsuya Waseda, Masanori Harata, Tatsuya Eguchi
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Patent number: 11329315Abstract: Disclosed is an all-solid-state lithium ion secondary battery including an anode that contains, as an anode active material, at least one selected from the group consisting of a metal that is able to form an alloy with Li, an oxide of the metal, and an alloy of the metal and Li, and being excellent in cycle characteristics. The all-solid-state lithium ion secondary battery may be an all-solid-state lithium ion secondary battery, wherein an anode comprises an anode active material, an electroconductive material and a solid electrolyte; wherein the anode active material comprises at least one active material selected from the group consisting of a metal that is able to form an alloy with Li, an oxide of the metal, and an alloy of the metal and Li; and wherein the solid electrolyte is particles with a BET specific surface area of from 1.8 m2/g to 19.7 m2/g.Type: GrantFiled: April 13, 2018Date of Patent: May 10, 2022Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Norihiro Ose, Hajime Hasegawa, Mitsutoshi Otaki, Yusuke Kintsu
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Publication number: 20210391576Abstract: A main object of the present disclosure is to provide an active material wherein a volume variation due to charge/discharge is small. The present disclosure achieves the object by providing an active material comprising a silicon clathrate II type crystal phase, and having a composition represented by NaxSi136, wherein 1.98<x<2.54.Type: ApplicationFiled: March 24, 2021Publication date: December 16, 2021Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Mitsutoshi OTAKI, Jun YOSHIDA, Kazuhiro SUZUKI, Masanori HARATA
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Patent number: 11196082Abstract: Provided are an anode mixture configured to provide excellent cycle characteristics when used in an all-solid-state lithium ion secondary battery, an anode containing the anode mixture, and an all-solid-state lithium ion secondary battery containing the anode. Disclosed is an anode mixture for an all-solid-state lithium ion secondary battery, wherein the anode mixture contains an anode active material, a solid electrolyte and an electroconductive material; wherein the anode active material contains at least one active material selected from the group consisting of a metal that is able to form an alloy with Li and an oxide of the metal; and wherein a value obtained by dividing, by a BET specific surface area (m2/g) of the solid electrolyte, a volume percentage (%) of the electroconductive material when a volume of the anode mixture is determined as 100 volume %, is 0.09 or more and 1.61 or less.Type: GrantFiled: April 9, 2018Date of Patent: December 7, 2021Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Norihiro Ose, Hajime Hasegawa, Yusuke Kintsu, Mitsutoshi Otaki
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Publication number: 20210305556Abstract: A main object of the present disclosure is to provide an active material wherein a volume variation due to charge/discharge is small. The present disclosure achieves the object by providing an active material comprising a silicon clathrate II type crystal phase, including a void inside a primary particle, and a void amount of the void with a fine pore diameter of 100 nm or less is 0.05 cc/g or more and 0.15 cc/g or less.Type: ApplicationFiled: March 24, 2021Publication date: September 30, 2021Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Mitsutoshi OTAKI, Jun YOSHIDA, Kazuhiro SUZUKI, Masanori HARATA
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Publication number: 20210300768Abstract: A method produces a Si-based active material containing a Si-based clathrate compound decreasing a Na element content while maintaining a crystal phase of type II clathrate. The method that produces a Si-based active material containing a Si-based clathrate compound having a crystal phase of type II clathrate, includes: preparing the Si-based clathrate compound by heating an alloy containing a Na element and a Si element at a temperature of 340° C. or more and less than 400° C. (a first heating step), heating the Si-based clathrate compound at a temperature of 340° C. or more and less than 470° C. after the first heating step (a second heating step), cooling the Si-based clathrate compound to a temperature of less than 340° C. after the second heating step (a cooling step), and heating the Si-based clathrate compound at a temperature of 340° C. or more and less than 470° C. after the cooling step (a third heating step).Type: ApplicationFiled: March 15, 2021Publication date: September 30, 2021Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Jun YOSHIDA, Kazuhiro SUZUKI, Mitsutoshi OTAKI
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Publication number: 20210126282Abstract: Disclosed is an all-solid-state lithium ion secondary battery being excellent in cycle characteristics. The all-solid-state lithium ion secondary battery may be an all-solid-state lithium ion secondary battery, wherein an anode comprises an anode active material, an electroconductive material and a solid electrolyte; wherein the anode active material comprises at least one active material selected from the group consisting of a metal that is able to form an alloy with Li, an oxide of the metal, and an alloy of the metal and Li; and wherein a bulk density of the solid electrolyte is 0.3 g/cm3 or more and 0.6 g/cm3 or less.Type: ApplicationFiled: April 13, 2018Publication date: April 29, 2021Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Norihiro OSE, Hajime HASEGAWA, Mitsutoshi OTAKI, Yusuke KINTSU
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Patent number: 10910666Abstract: Disclosed is a method for producing an all-solid-state lithium ion secondary battery being excellent in cycle characteristics. The production method may be a method for producing an all-solid-state lithium ion secondary battery, wherein the method comprises an anode mixture forming step of obtaining an anode mixture by drying a raw material for an anode mixture, which contains an anode active material, a solid electrolyte and an electroconductive material; and wherein, for the anode mixture after being dried in the anode mixture forming step, a voidage V of the inside of the anode mixture calculated by the following formula (1) is 43% or more and 54% or less: V=100?(D1/D0)×100??Formula (1).Type: GrantFiled: April 11, 2018Date of Patent: February 2, 2021Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Norihiro Ose, Hajime Hasegawa, Mitsutoshi Otaki, Yusuke Kintsu
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Publication number: 20210020938Abstract: A main object of the present disclosure is to provide an active material wherein an expansion upon intercalation of a metal ion such as a Li ion is suppressed. The present disclosure achieves the object by providing an active material comprising a silicon clathrate type crystal phase, and the active material includes a Na element, a Si element and a M element that is a metal element with an ion radius larger than the Si element, and a proportion of the M element to a total of the Si element and the M element is 0.1 atm % or more and 5 atm % or less.Type: ApplicationFiled: June 19, 2020Publication date: January 21, 2021Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Hiroyuki YAMAGUCHI, Hironori DAIKOKU, Jun YOSHIDA, Kazuhiro SUZUKI, Mitsutoshi OTAKI
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Patent number: 10847836Abstract: A method for producing a solid-state secondary battery system comprising a lithium ion solid-state battery that comprises a cathode, an anode and a solid electrolyte layer disposed between the cathode and the anode, and a controller for controlling charge and discharge voltages of the lithium ion solid-state battery in use, the method comprising: obtaining an anode member from an anode material which contains at least elemental Si particles serving as an anode active material and a fibrous carbon serving as a conductive additive material, and in which the contained fibrous carbon is 4.8 vol % or more, obtaining a battery member by disposing a solid electrolyte member between the anode member and a cathode member and attaching them, and carrying out initial constant current charging on the battery member, at a charge rate of 1.0 C or more, to a voltage higher than a maximum charge voltage controlled by the controller.Type: GrantFiled: February 21, 2019Date of Patent: November 24, 2020Assignee: Toyota Jidosha Kabushiki KaishaInventors: Mitsutoshi Otaki, Norihiro Ose, Shigenori Hama
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Patent number: 10818977Abstract: A main object of the present disclosure is to provide a method for producing an all solid state battery capable of satisfying both of improving capacity durability and suppressing the increase of an initial resistance. The above object is achieved by providing a method for producing an all solid state battery, the method comprising: a preparing step of preparing an all solid state battery including a cathode layer, a solid electrolyte layer, and an anode layer, in this order; and an initial charging step of initially charging the all solid state battery, wherein the anode layer includes a metal particle capable of being alloyed with Li, and having two kinds or more of crystal orientation in one particle, as an anode active material, and in the initial charging step, the all solid state battery is charged to a battery voltage of 4.35 V or more and 4.55 V or less.Type: GrantFiled: April 8, 2019Date of Patent: October 27, 2020Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Mitsutoshi Otaki, Norihiro Ose, Shigenori Hama
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Patent number: 10818975Abstract: [Problem] To provide a method for the production of an all-solid-state battery using an alloy-based negative electrode active material in which it is possible to suppress degradation in performance of the all-solid-state battery during actual use while the restraint pressure during actual use of the all-solid-state battery is relatively small. [Solving Means] The method for producing an all-solid-state battery of the present disclosure produces an all-solid-state battery having a battery laminate comprising a positive electrode current collector layer, a positive electrode active material layer, a solid electrolyte layer, a negative electrode active material layer, and a negative electrode current collector layer laminated in this order, wherein the battery laminate is restrained in the lamination direction by an actual use restraint member. The negative electrode active material layer contains particles of an alloy-based negative electrode active material.Type: GrantFiled: September 12, 2018Date of Patent: October 27, 2020Assignee: Toyota Jidosha Kabushiki KaishaInventors: Mitsutoshi Otaki, Norihiro Ose, Shigenori Hama