Patents by Inventor Tatsuya Akira

Tatsuya Akira 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: 20210104728
    Abstract: A negative electrode material includes a graphite material, an alkali metal salt, and at least one metal material selected from the group consisting of Fe, Mn, Mg, Ni, Pd, Rh, Os, and Pt. The graphite material contains natural graphite.
    Type: Application
    Filed: February 14, 2018
    Publication date: April 8, 2021
    Applicant: Panasonic Intellectual Property Management Co., Ltd.
    Inventors: Tatsuya Akira, Taisuke Yamamoto
  • Publication number: 20210066716
    Abstract: This negative electrode active material for a secondary cell which is one aspect of the present disclosure comprises: a silicate phase that contains Li, Si, and Mx (Mx alkali metal, alkaline earth metal, and an element other than Si); silicon particles dispersed in the silicate phase; and oxide particles that contain Zr dispersed in the silicate phase. The content of each element with respect to the total of the elements other than oxygen in the silicate phase is 3 to 45 mol % for Li, 40 to 78 mol % for Si, and 1 to 40 mol % for Mx.
    Type: Application
    Filed: January 21, 2019
    Publication date: March 4, 2021
    Applicant: Panasonic Intellectual Property Management Co., Ltd.
    Inventors: Yohei Uchiyama, Norihisa Yamamoto, Tatsuya Akira
  • Publication number: 20210057727
    Abstract: A negative electrode active substance for a secondary battery, which is one embodiment of the present disclosure, comprises: a silicate phase which contains Li, Si and Mx (Mx is an alkali metal, an alkaline earth metal or an element other than Si); silicon particles dispersed in the silicate phase; and metal particles which are dispersed in the silicate phase and are constituted mainly from one or more metals selected from among Fe, Cr, Ni, Mn, Cu, Mo, Zn and Al or an alloy of these. In the silicate phase, the content of the following elements, relative to the total amount of elements other than oxygen, is: 3-45 mol % of Li; 40-78 mol % of Si; and 1-40 mol % of Mx.
    Type: Application
    Filed: January 21, 2019
    Publication date: February 25, 2021
    Applicant: Panasonic Intellectual Property Management Co., Ltd.
    Inventors: Tatsuya Akira, Yohei Uchiyama, Norihisa Yamamoto
  • Publication number: 20200365898
    Abstract: Negative electrode active material particles according to the present invention have composite particles that include: a sodium silicate phase with a Vickers hardness of 150 Hv or greater, and silicon particles dispersed in the sodium silicate phase.
    Type: Application
    Filed: October 26, 2018
    Publication date: November 19, 2020
    Applicant: Panasonic Intellectual Property Management Co., Ltd.
    Inventors: Yohei Uchiyama, Norihisa Yamamoto, Tatsuya Akira, Kazuro Hayashida
  • Publication number: 20200350591
    Abstract: A lithium battery including a negative electrode having a negative electrode active material layer that contains lithium silicate particles and a binder. The lithium silicate particles include composite particles including a lithium silicate phase and silicon particles dispersed in the lithium silicate phase, wherein a carbon material is present inside the composite particles, and an area ratio of the carbon material occupying a cross section of the composite particles is 0.008 to 6%. The binder includes at least a first resin, wherein the first resin is at least cue selected from the group consisting of polyacrylic acid, a polyacrylic acid salt, and their derivatives. The first resin is contained in an amount of 2 mass % or less in the negative electrode active material layer.
    Type: Application
    Filed: October 26, 2018
    Publication date: November 5, 2020
    Applicant: Panasonic Intellectual Property Management Co., Ltd.
    Inventors: Yohei Uchiyama, Taisuke Yamamoto, Tatsuya Akira, Norihisa Yamamoto, Hiroshi Minami
  • Publication number: 20200350563
    Abstract: A negative electrode active material for non-aqueous electrolyte secondary batteries, including: lithium silicate composite particles including a lithium silicate phase and silicon particles dispersed in the lithium silicate phase, the lithium silicate phase being an oxide phase including Li, Si, O, and M, where M is an element other than the following elements: Group 1 elements of alkali metals, Group 16 elements of oxygen group, Group 18 elements of rare gas, and Si. An amount of each element relative to a total amount of Li, Si and M in the lithium silicate phase is 3 to 55 mol % for Li, 25 mol % or more for Si, and 3 to 50 mol % for M. A carbon material is present inside the lithium silicate composite particles; and an area ratio of the carbon material occupying a cross section of the composite particles is 0.008 to 6%.
    Type: Application
    Filed: October 29, 2018
    Publication date: November 5, 2020
    Applicant: Panasonic Intellectual Property Management Co., Ltd.
    Inventors: Yohei Uchiyama, Norihisa Yamamoto, Tatsuya Akira
  • Publication number: 20200321611
    Abstract: A negative electrode active substance particle according to one embodiment of the present invention, comprises a mother particle that has: a silicate phase that includes Na, Si, and at least one element selected from M, M1, M2, M3 and M4 (M is an alkali earth metal, and M1, M2, M3 and M4 are elements other than alkali metals, alkali earth metals or Si); and silicon particles dispersed in the silicate phase. The contents of the elements in the silicate phase are: 9-52 mol % of Na; 3-50 mol % of M, M1, M2, M3 and M4; and at least 25 mol % of Si.
    Type: Application
    Filed: December 26, 2018
    Publication date: October 8, 2020
    Applicant: Panasonic Intellectual Property Management Co., Ltd.
    Inventors: Yohei Uchiyama, Norihisa Yamamoto, Tatsuya Akira
  • Patent number: 10741833
    Abstract: There is provided a negative electrode active material for a nonaqueous electrolyte secondary battery, the negative electrode active material including a base particle containing Si and SiO2, a mixed phase coating that covers a surface of the base particle and contains SiO2 and carbon, and a carbon coating that covers a surface of the mixed phase coating. The base particle is preferably formed of SiOX (0.5?X?1.5). The mixed phase coating preferably contains carbon dispersed in a phase formed of SiO2. The cycle characteristics of a nonaqueous electrolyte secondary battery including negative electrode active material particles containing Si and SiO2 are improved.
    Type: Grant
    Filed: August 1, 2018
    Date of Patent: August 11, 2020
    Assignee: SANYO Electric Co., Ltd.
    Inventors: Tatsuya Akira, Hiroshi Minami, Taizou Sunano, Yoshio Kato
  • Publication number: 20200020932
    Abstract: Disclosed is a negative electrode material for a non-aqueous electrolyte secondary battery, including: a lithium silicate phase; silicon particles dispersed in the lithium silicate phase; and at least one element Me dispersed in the lithium silicate phase, and selected from the group consisting of a rare-earth element and an alkaline-earth metal. The composition of the lithium silicate phase is represented, for example, by the formula: Li2zSiO2+z, and satisfies 0<z<2, and the element Me is dispersed in the lithium silicate phase, for example, as an Me oxide.
    Type: Application
    Filed: February 16, 2018
    Publication date: January 16, 2020
    Applicant: Panasonic Intellectual Property Management Co., Ltd.
    Inventors: Taisuke Asano, Yohei Uchiyama, Taisuke Yamamoto, Tatsuya Akira, Norihisa Yamamoto, Hiroshi Minami
  • Publication number: 20190319261
    Abstract: Disclosed is a negative electrode material including: a lithium silicate phase that contains a lithium silicate; and silicon particles that are dispersed in the lithium silicate phase, wherein the silicon particles have a crystallite size of 10 nm or more, and the lithium silicate has a composition represented by the following formula: Li2Si2O5.(x?2)SiO2, where 2<x?18 is satisfied.
    Type: Application
    Filed: November 17, 2017
    Publication date: October 17, 2019
    Applicant: Panasonic Intellectual Property Management Co., Ltd.
    Inventors: Yohei Uchiyama, Taisuke Yamamoto, Tatsuya Akira, Norihisa Yamamoto, Hiroshi Minami
  • Patent number: 10424780
    Abstract: In a nonaqueous electrolyte secondary battery containing SiOX as a negative electrode active material, initial charge/discharge efficiency and cycle characteristics are increased. A negative electrode active material for nonaqueous electrolyte secondary batteries is provided. The negative electrode active material contains particles comprising of SiOx (0.8?X?1.2). The particles have cracks therein. SiOX preferably contains a lithium silicate phase, a Si-M compound, or an oxide of M (M is at least one selected from the group consisting of Al, Ti, Fe, and Ni). The cracks preferably extend radially from inner portions of the particles.
    Type: Grant
    Filed: September 11, 2014
    Date of Patent: September 24, 2019
    Assignee: SANYO Electric Co., Ltd.
    Inventors: Hiroshi Minami, Tatsuya Akira, Taizou Sunano
  • Patent number: 10312507
    Abstract: The initial charge/discharge efficiency and cycle characteristics of a non-aqueous electrolyte secondary battery that contains a silicon material as a negative-electrode active material are improved. A negative-electrode active material particle (10) according to an embodiment includes a lithium silicate phase (11) represented by Li2zSiO(2+z) {0<z<2} and silicon particles (12) dispersed in the lithium silicate phase (11). A lithium silicate constituting the lithium silicate phase has a crystallite size of 40 nm or less. The crystallite size is calculated using the Scherrer equation from the half-width of a diffraction peak of a (111) plane of the lithium silicate in an XRD pattern obtained by XRD measurement of the negative-electrode active material particle 10.
    Type: Grant
    Filed: January 18, 2016
    Date of Patent: June 4, 2019
    Assignee: SANYO Electric Co., Ltd.
    Inventors: Tatsuya Akira, Yoshio Kato, Hiroshi Minami, Taizou Sunano
  • Patent number: 10312516
    Abstract: A negative-electrode active material for a non-aqueous electrolyte secondary battery containing a silicon material, wherein the negative-electrode active material can constitute a non-aqueous electrolyte secondary battery having high charge capacity, high initial charge/discharge efficiency, and good cycle characteristics. A negative-electrode active material particle according to an embodiment includes a lithium silicate phase represented by Li2zSiO(2+z) {0<z<2} and particles dispersed in the lithium silicate phase. Each of the particles includes a silicon core particle and a surface layer formed of an iron alloy containing Si (FeSi alloy). In an XRD pattern of the negative-electrode active material particle obtained by XRD measurement, a diffraction peak of the FeSi alloy at 2?=approximately 45 degrees has a half-width of 0.40 degrees or more, and a diffraction peak of a Si (111) plane at 2?=approximately 28 degrees has a half-width of 0.40 degrees or more.
    Type: Grant
    Filed: January 18, 2016
    Date of Patent: June 4, 2019
    Assignee: SANYO Electric Co., Ltd.
    Inventors: Tatsuya Akira, Hiroshi Minami, Taizou Sunano
  • Publication number: 20190044131
    Abstract: There is provided a negative electrode active material for a nonaqueous electrolyte secondary battery, the negative electrode active material including a base particle containing Si and SiO2, a mixed phase coating that covers a surface of the base particle and contains SiO2 and carbon, and a carbon coating that covers a surface of the mixed phase coating. The base particle is preferably formed of SiOX (0.5?X?1.5). The mixed phase coating preferably contains carbon dispersed in a phase formed of SiO2. The cycle characteristics of a nonaqueous electrolyte secondary battery including negative electrode active material particles containing Si and SiO2 are improved.
    Type: Application
    Filed: August 1, 2018
    Publication date: February 7, 2019
    Applicant: SANYO Electric Co., Ltd.
    Inventors: Tatsuya Akira, Hiroshi Minami, Taizou Sunano, Yoshio Kato
  • Publication number: 20180287148
    Abstract: A negative-electrode active material for a non-aqueous electrolyte secondary battery containing a silicon material, wherein the negative-electrode active material can constitute a non-aqueous electrolyte secondary battery having high charge capacity, high initial charge/discharge efficiency, and good cycle characteristics. A negative-electrode active material particle according to an embodiment includes a lithium silicate phase represented by Li2zSiO(2+z) {0<z<2} and particles dispersed in the lithium silicate phase. Each of the particles includes a silicon core particle and a surface layer formed of an iron alloy containing Si (FeSi alloy). In an XRD pattern of the negative-electrode active material particle obtained by XRD measurement, a diffraction peak of the FeSi alloy at 2?=approximately 45 degrees has a half-width of 0.40 degrees or more, and a diffraction peak of a Si (111) plane at 2?=approximately 28 degrees has a half-width of 0.40 degrees or more.
    Type: Application
    Filed: January 18, 2016
    Publication date: October 4, 2018
    Applicant: Sanyo Electric Co., Ltd.
    Inventors: Tatsuya Akira, Hiroshi Minami, Taizou Sunano
  • Publication number: 20180287140
    Abstract: Negative electrode active material particles each include a composite particle containing silicon particles and a lithium silicate phase represented by LixSiOy (0<x?4, and 0<y?4); and a surface layer provided on the surface of the composite particle, and the surface layer contains a silane coupling agent.
    Type: Application
    Filed: August 23, 2016
    Publication date: October 4, 2018
    Applicant: Panasonic Intellectual Property Management Co., Ltd.
    Inventors: Tatsuya Akira, Taizou Sunano, Hiroshi Minami
  • Patent number: 10062903
    Abstract: There is provided a negative electrode active material for a nonaqueous electrolyte secondary battery, the negative electrode active material including a base particle containing Si and SiO2, a mixed phase coating that covers a surface of the base particle and contains SiO2 and carbon, and a carbon coating that covers a surface of the mixed phase coating. The base particle is preferably formed of SiOX (0.5?X?1.5). The mixed phase coating preferably contains carbon dispersed in a phase formed of SiO2. The cycle characteristics of a nonaqueous electrolyte secondary battery including negative electrode active material particles containing Si and SiO2 are improved.
    Type: Grant
    Filed: August 21, 2015
    Date of Patent: August 28, 2018
    Assignee: SANYO Electric Co., Ltd.
    Inventors: Tatsuya Akira, Hiroshi Minami, Taizou Sunano, Yoshio Kato
  • Publication number: 20170331102
    Abstract: The initial charge/discharge efficiency and cycle characteristics of a non-aqueous electrolyte secondary battery that contains a silicon material as a negative-electrode active material are improved. A negative-electrode active material particle (10) according to an embodiment includes a lithium silicate phase (11) represented by Li2zSiO(2+z) {0<z<2} and silicon particles (12) dispersed in the lithium silicate phase (11). A lithium silicate constituting the lithium silicate phase has a crystallite size of 40 nm or less. The crystallite size is calculated using the Scherrer equation from the half-width of a diffraction peak of a (111) plane of the lithium silicate in an XRD pattern obtained by XRD measurement of the negative-electrode active material particle 10.
    Type: Application
    Filed: January 18, 2016
    Publication date: November 16, 2017
    Applicant: Sanyo Electric Co., Ltd.
    Inventors: Tatsuya Akira, Yoshio Kato, Hiroshi Minami, Taizou Sunano
  • Publication number: 20170117541
    Abstract: The cycle characteristics of a nonaqueous electrolyte secondary battery including negative electrode active material particles containing Si and SiO2 are improved. There is provided a negative electrode active material for a nonaqueous electrolyte secondary battery, the negative electrode active material including a base particle containing Si and SiO2, a mixed phase coating that covers a surface of the base particle and contains SiO2 and carbon, and a carbon coating that covers a surface of the mixed phase coating. The base particle is preferably formed of SiOX (0.5?X?1.5). The mixed phase coating preferably contains carbon dispersed in a phase formed of SiO2.
    Type: Application
    Filed: August 21, 2015
    Publication date: April 27, 2017
    Applicant: SANYO Electric Co., Ltd.
    Inventors: Tatsuya Akira, Hiroshi Minami, Taizou Sunano, Yoshio Kato
  • Publication number: 20160329562
    Abstract: In a nonaqueous electrolyte secondary battery in which SiOx is used as a negative electrode active material, initial charge/discharge efficiency and cycle characteristics are improved. Provided is a negative electrode active material, containing particles made of SiOx (0.5?X?1.5), for nonaqueous electrolyte secondary batteries. In the negative electrode active material, amorphous carbon is stuck on carbon coatings. The particles made of SiOx preferably have a size of 1 ?m to 15 ?m. Particles of amorphous carbon preferably have a size of 0.01 ?m to 1 ?m. One hundred percent of the surface of SiOx is preferably covered by the carbon coatings.
    Type: Application
    Filed: December 12, 2014
    Publication date: November 10, 2016
    Applicant: Sanyo Electric Co., Ltd.
    Inventors: Tatsuya Akira, Hiroshi Minami, Taizou Sunano, Yoshio Kato