Patents by Inventor Tetsuya Sasakawa
Tetsuya Sasakawa 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).
-
Publication number: 20220293915Abstract: According to an embodiment, an electrode group is provided. The electrode group includes a positive electrode, and a negative electrode. The negative electrode active material-containing layer includes a facing section which faces the positive electrode active material-containing layer and a non-facing section which does not. A first fluorine-containing coating is formed on a main surface of the negative electrode active material-containing layer in at least a part of the non-facing section. The abundance ratio of fluorine atoms included in the first fluorine-containing coating is in the range of 2.5 atom % to 10 atom %.Type: ApplicationFiled: August 31, 2021Publication date: September 15, 2022Applicant: KABUSHIKI KAISHA TOSHIBAInventors: Yasunobu YAMASHITA, Tetsuya SASAKAWA, Yasuhiro HARADA, Norio TAKAMI, Shinsuke MATSUNO
-
Patent number: 11430985Abstract: According to one embodiment, an electrode is provided. A length of a first active material portion along a first direction is within a range of 0.7T or more and 0.95T or less with respect to a thickness T of an active material-containing layer. The first direction is parallel to a thickness direction. A second active material portion further contains solid electrolyte particles. A ratio E1/E2 is 0 or more and 0.01 or less. The ratio E1/E2 represents a ratio of a content E1 of the solid electrolyte particles per unit area in the first active material portion (including 0) to a content E2 of the solid electrolyte particles per unit area in the second active material portion.Type: GrantFiled: September 10, 2019Date of Patent: August 30, 2022Assignee: KABUSHIKI KAISHA TOSHIBAInventors: Keigo Hoshina, Kazuomi Yoshima, Tomoko Sugizaki, Tomoe Kusama, Tetsuya Sasakawa, Yasuhiro Harada, Norio Takami
-
Patent number: 11380885Abstract: According to one embodiment, an electrode is provided. The electrode includes an active material-containing layer. The active material-containing layer includes: an active material including a titanium-containing composite oxide; inorganic solid particles having lithium ion conductivity; and carbon fiber. The active material-containing layer has a first peak indicating a maximum log differential pore volume in a log differential pore volume distribution curve according to mercury porosimetry. A pore diameter PD at the first peak is 0.01 ?m to 0.1 ?m. The first peak has a full width at half maximum of 0.05 ?m or less.Type: GrantFiled: February 28, 2020Date of Patent: July 5, 2022Assignee: KABUSHIKI KAISHA TOSHIBAInventors: Tomoe Kusama, Tetsuya Sasakawa, Kazuomi Yoshima, Tomoko Sugizaki, Wen Zhang, Yasuhiro Harada, Norio Takami
-
Publication number: 20220149363Abstract: According to a storage battery of an embodiment includes a first battery module and a second battery module connected in parallel with the first battery module. The number of first cells connected in series in the first battery module is M, and the number of second cells connected in series in the second battery module is N. When an open circuit voltage at SOC=X % of the first cells and the second cells are Va1 (X) and Va2 (X), respectively, the voltages of the battery modules are M×Va1 (X)<N×Va2 (X) in the range where the SOC of the cell is 0% to 30%, and M×Va1 (X)>N×Va2 (X) in the range where the SOC of the cell is 70% to 100%.Type: ApplicationFiled: January 20, 2022Publication date: May 12, 2022Applicant: KABUSHIKI KAISHA TOSHIBAInventors: Ryosuke Yagi, Yasuhiro Harada, Norio Takami, Tetsuya Sasakawa, Norihiro Yoshinaga, Yuta Kanai
-
Publication number: 20220085456Abstract: According to one embodiment, an electrode group is provided. The electrode group includes a positive electrode, a negative electrode, and a gel polymer layer interposed between the positive electrode and the negative electrode. At least a part of the negative electrode is opposed to the positive electrode. The gel polymer layer is formed of a gel electrolyte composed of a polymer material, an organic solvent and a lithium salt, and a sheet base member which supports the gel electrolyte, or the gel polymer layer is formed of only the gel electrolyte.Type: ApplicationFiled: February 19, 2021Publication date: March 17, 2022Applicant: KABUSHIKI KAISHA TOSHIBAInventors: Tomoe KUSAMA, Kazuomi YOSHIMA, Tetsuya SASAKAWA, Yasuhiro HARADA, Norio TAKAMI
-
Publication number: 20220085365Abstract: According to one embodiment, an electrode is provided. The electrode includes a current collector, and an active material-containing layer which is formed on a surface of the current collector and includes a plurality of niobium titanium composite oxide particles. A X-ray diffraction pattern using a Cu-K? ray source with respect to a surface of the active material-containing layer includes a peak A with a highest intensity in a range of 2?=26°±0.2° and a peak B with a highest intensity in a range of 2?=23.9°±0.2°. An intensity ratio (Ia/Ib) between an intensity Ia of the peak A and an intensity Ib of the peak B is in a range of 1.80 or more to 2.60 or less.Type: ApplicationFiled: February 26, 2021Publication date: March 17, 2022Applicant: KABUSHIKI KAISHA TOSHIBAInventors: Kakuya UEDA, Yasunobu YAMASHITA, Keigo HOSHINA, Tetsuya SASAKAWA, Yasuhiro HARADA, Norio TAKAMI, Shinsuke MATSUNO
-
Publication number: 20220085357Abstract: According to one embodiment, a secondary battery includes a positive electrode including first vacancies, a negative electrode including second vacancies, and an electrolyte. The electrolyte includes a gel polymer portion and a liquid portion, and the gel polymer portion has a gel-part ratio within a range of from 20% to 80%. At least a part of the electrolyte is held in the first vacancies and the second vacancies. A first ratio r1 of the liquid portion to the gel polymer portion in the first vacancies is within a range of 0.01?r1?10. A second ratio r2 of the liquid portion to the gel polymer portion in the second vacancies is within a range of 0.01?r2?10.Type: ApplicationFiled: February 26, 2021Publication date: March 17, 2022Applicant: KABUSHIKI KAISHA TOSHIBAInventors: Kazuomi YOSHIMA, Tomoe KUSAMA, Tetsuya SASAKAWA, Yasuhiro HARADA, Norio TAKAMI
-
Publication number: 20220085638Abstract: According to one embodiment, a storage battery includes one or more first batteries that include a first active material as a negative electrode active material, and one or more second batteries that include a second active material having an operation electric potential lower than that of the first active material as a negative electrode active material. Charge and the discharge of the second batteries are stopped based on a fact that a temperature of the storage battery is lower than a temperature threshold. The second batteries are caused to charge or discharge based on a fact that the temperature of the storage battery is equal to or higher than the temperature threshold.Type: ApplicationFiled: February 26, 2021Publication date: March 17, 2022Applicant: KABUSHIKI KAISHA TOSHIBAInventors: Tomoko SUGIZAKI, Tomoe KUSAMA, Yuta KANAI, Keigo HOSHINA, Tetsuya SASAKAWA, Ryosuke YAGI, Yasuhiro HARADA, Norio TAKAMI
-
Patent number: 11217793Abstract: According to one embodiment, an electrode is provided. The electrode includes the active material-containing layer formed on the current collector and including active material particles. The particle size distribution chart obtained by the laser diffraction scattering method for the active material particles includes the first region and the second region. The first particle group included in the first region includes the first active material particles, and the second particle group included in the second region includes second active material particles. The carbon coverage of the first particle group is higher than the carbon coverage of the second particle group.Type: GrantFiled: February 28, 2020Date of Patent: January 4, 2022Assignee: KABUSHIKI KAISHA TOSHIBAInventors: Yuta Kanai, Tetsuya Sasakawa, Keigo Hoshina, Yasuhiro Harada, Norio Takami
-
Patent number: 11139476Abstract: According to one embodiment, there is provided an active material represented by a general formula Lix(NiaCobMncMd)1?s(Nb1?tTat)sO2. Here, M is at least one selected from the group consisting of Li, Ca, Mg, Al, Ti, V, Cr, Zr, Mo, Hf, and W, and 1.0?x?1.3, 0?a?0.9, 0?b?1.0, 0?c?0.8, 0?d?0.5, a+b+c+d=1, 0.005?s?0.3, and 0.0005?t?0.1 are satisfied.Type: GrantFiled: September 3, 2019Date of Patent: October 5, 2021Assignee: KABUSHIKI KAISHA TOSHIBAInventors: Tetsuya Sasakawa, Yasuhiro Harada, Norio Takami
-
Publication number: 20210296631Abstract: According to one embodiment, provided is a secondary battery including a positive electrode, a negative electrode, and an electrolyte. The negative electrode includes a niobium-titanium composite oxide having fluorine atoms on at least part of a surface the niobium-titanium composite oxide. An abundance ratio AF of fluorine atoms, an abundance ratio ATi of titanium atoms, and an abundance ratio ANb of niobium atoms on a surface of the negative electrode according to X-ray photoelectron spectroscopy satisfy a relationship of 3.5?AF/(ATi+ANb)?50.Type: ApplicationFiled: August 31, 2020Publication date: September 23, 2021Applicant: KABUSHIKI KAISHA TOSHIBAInventors: Keigo HOSHINA, Wen ZHANG, Tetsuya SASAKAWA, Yasuhiro HARADA, Norio TAKAMI
-
Publication number: 20210083269Abstract: According to one embodiment, an electrode is provided. The active material-containing layer includes an active material, inorganic solid particles having lithium ion conductivity, and carbon fiber. A pore diameter DM at the first peak is 0.05 ?m to 10 ?m. A value SA-SB is 1.4 or more in a slope distribution curve of the active material-containing layer, where a vertical axis of the slope distribution curve represents a slope of a straight line passing through two adjacent measurement points on the log differential pore volume distribution curve and a horizontal axis of the slope distribution curve represents a smaller pore diameter of the two adjacent measurement points. The value SA-SB is obtained by subtracting a minimum slope value SB from a maximum slope value SA.Type: ApplicationFiled: February 28, 2020Publication date: March 18, 2021Applicant: KABUSHIKI KAISHA TOSHIBAInventors: Tomoe Kusama, Tetsuya Sasakawa, Kazuomi Yoshima, Tomoko Sugizaki, Wen Zhang, Yasuhiro Harada, Norio Takami
-
Publication number: 20210083268Abstract: According to one embodiment, an electrode is provided. The electrode includes an active material-containing layer. The active material-containing layer includes: an active material including a titanium-containing composite oxide; inorganic solid particles having lithium ion conductivity; and carbon fiber. The active material-containing layer has a first peak indicating a maximum log differential pore volume in a log differential pore volume distribution curve according to mercury porosimetry. A pore diameter PD at the first peak is 0.01 ?m to 0.1 ?m. The first peak has a full width at half maximum of 0.05 ?m or less.Type: ApplicationFiled: February 28, 2020Publication date: March 18, 2021Applicant: KABUSHIKI KAISHA TOSHIBAInventors: Tomoe KUSAMA, Tetsuya Sasakawa, Kazuomi Yoshima, Tomoko Sugizaki, Wen Zhang, Yosuhiro Harada, Norio Takami
-
Publication number: 20210083298Abstract: According to one embodiment, an electrode is provided. The electrode includes a current collector, a first layer formed on the current collector, and a second layer formed on at least part of the first layer. The first layer contains a monoclinic niobium titanium composite oxide. The second layer contains lithium titanate having a spinel structure. A porosity P2 of the second layer is within a range from 30% to 80%.Type: ApplicationFiled: February 11, 2020Publication date: March 18, 2021Applicant: KABUSHIKI KAISHA TOSHIBAInventors: Tomoko Sugizaki, Tetsuya Sasakawa, Kazuomi Yoshima, Tomoe Kusama, Yasuhiro Harada, Norio Takami
-
Publication number: 20210083297Abstract: According to one embodiment, an electrode is provided. The electrode includes the active material-containing layer formed on the current collector and including active material particles. The particle size distribution chart obtained by the laser diffraction scattering method for the active material particles includes the first region and the second region. The first particle group included in the first region includes the first active material particles, and the second particle group included in the second region includes second active material particles. The carbon coverage of the first particle group is higher than the carbon coverage of the second particle group.Type: ApplicationFiled: February 28, 2020Publication date: March 18, 2021Applicant: KABUSHIKI KAISHA TOSHIBAInventors: Yuta KANAI, Tetsuya SASAKAWA, Keigo HOSHINA, Yasuhiro HARADA, Norio TAKAMI
-
Patent number: 10886574Abstract: An electrode for a secondary battery includes titanium-containing oxide as an active material. The median pore diameter of the electrode is 0.050 ?m or more and 0.1 ?m or less and pore surface area of the electrode is 4 m2/g or more and 8 m2/g or less, by mercury porosimetry.Type: GrantFiled: September 1, 2017Date of Patent: January 5, 2021Assignee: Kabushiki Kaisha ToshibaInventors: Tetsuya Sasakawa, Norio Takami
-
Publication number: 20200403229Abstract: According to one embodiment, there is provided an active material represented by a general formula Lix(NiaCobMncMd)1?s(Nb1?t?uTatM?u)sO2. Here, M is at least one selected from the group consisting of Li, Ca, Mg, Al, Ti, V, Cr, Zr, Mo, Hf, and W, M? is at least one selected from the group consisting of K, P, Fe, Si, Na, Cu and Zn, and 1.0?x?1.3, 0?a?0.9, 0?b?1.0, 0?c?0.8, 0?d?0.5, a+b+c+d=1, 0.005?s?0.3, 0.0005?t?0.1, and 0?u?0.3 are satisfied.Type: ApplicationFiled: August 31, 2020Publication date: December 24, 2020Applicant: KABUSHIKI KAISHA TOSHIBAInventors: Tetsuya Sasakawa, Yasuhiro Harada, Norio Takami
-
Active material containing an Nb2TiO7 phase, electrode, secondary battery, battery pack, and vehicle
Patent number: 10862118Abstract: An active material includes an Nb2TiO7 phase and at least one Nb-rich phase selected from an Nb10Ti2O29 phase, an Nb14TiO37 phase, and an Nb24TiO64 phase. The active material satisfies a peak intensity ratio represented by the following Formula (1): 0<IB/IA?0.25 (1). In Formula (1), IA is a peak intensity of the maximum peak attributed to the Nb2TiO7 phase and appealing at 2? of 26.0±0.1° in a wide angle X-ray diffraction pattern under CuK? rays as an X-ray source, and IB is a peak intensity of the maximum peak attributed to the at least one Nb-rich phase and appearing at 2? of 24.9±0.2° in the diffraction pattern.Type: GrantFiled: August 30, 2018Date of Patent: December 8, 2020Assignees: KABUSHIKI KAISHA TOSHIBA, Toshiba Infrastructure Systems & Solutions CorporationInventors: Yasuhiro Harada, Norio Takami, Tetsuya Sasakawa, Yusuke Namiki, Yasunobu Yamashita -
Patent number: 10840563Abstract: In one embodiment, a secondary battery includes, electrode groups, an insulating sheet, and a container member. The insulating sheet is disposed between the electrode groups. At least part of the insulating sheet is joined to the container member. The container member covers the outside of a stack having the electrode groups and the insulating sheet.Type: GrantFiled: August 31, 2017Date of Patent: November 17, 2020Assignee: KABUSHIKI KAISHA TOSHIBAInventors: Tetsuya Sasakawa, Kazuomi Yoshima, Yasuhiro Harada, Norio Takami
-
Publication number: 20200303730Abstract: According to one embodiment, an electrode is provided. A length of a first active material portion along a first direction is within a range of 0.7T or more and 0.95T or less with respect to a thickness T of an active material-containing layer. The first direction is parallel to a thickness direction. A second active material portion further contains solid electrolyte particles. A ratio E1/E2 is 0 or more and 0.01 or less. The ratio E1/E2 represents a ratio of a content E1 of the solid electrolyte particles per unit area in the first active material portion (including 0) to a content E2 of the solid electrolyte particles per unit area in the second active material portion.Type: ApplicationFiled: September 10, 2019Publication date: September 24, 2020Applicant: KABUSHIKI KAISHA TOSHIBAInventors: Keigo HOSHINA, Kazuomi Yoshima, Tomoko Sugizaki, Tomoe Kusama, Tetsuya Sasakawa, Yasuhiro Harada, Norio Takami