Patents by Inventor Maiko Saka

Maiko Saka 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).

  • Patent number: 9899665
    Abstract: Disclosed is a sodium secondary battery. The sodium secondary battery comprises a first electrode and a second electrode comprising a carbonaceous material. The carbonaceous material satisfies one or more requirements selected from the group consisting of requirements 1, 2, 3 and 4. Requirement 1: R value (=ID/IG) obtained by Raman spectroscopic measurement is 1.07 to 3. Requirement 2: A value and ?A value obtained by small angle X-ray scattering measurement are ?0.5 to 0 and 0 to 0.010, respectively. Requirement 3: for an electrode comprising an electrode mixture obtained by mixing 85 parts by weight of the carbonaceous material with 15 parts by weight of poly(vinylidene fluoride), the carbonaceous material in the electrode after being doped and dedoped with sodium ions is substantially free from pores having a size of not less than 10 nm. Requirement 4: Q1 value obtained by a calorimetric differential thermal analysis is not more than 800 joules/g.
    Type: Grant
    Filed: July 29, 2009
    Date of Patent: February 20, 2018
    Assignee: SUMITOMO CHEMICAL COMPANY, LIMITED
    Inventors: Taketsugu Yamamoto, Hideaki Nakajima, Hiroshi Inukai, Shigekazu Ohmori, Chikara Murakami, Daisuke Nakaji, Hidekazu Yoshida, Maiko Saka
  • Patent number: 9287554
    Abstract: The present invention provides a positive electrode active material. The positive electrode active material is represented by the following formula (I) and has a BET specific surface area of larger than 5 m2/g and not larger than 15 m2/g: LixM1yM31-yO2??(I) wherein M1 is at least one transition metal element selected from Group 5 elements and Group 6 elements of the Periodic Table, M3 is at least one transition metal element other than M1 and selected from among transition metal elements excluding Fe, x is not less than 0.9 and not more than 1.3, and y is more than 0 and less than 1.
    Type: Grant
    Filed: August 22, 2011
    Date of Patent: March 15, 2016
    Assignee: SUMITOMO CHEMICAL COMPANY, LIMITED
    Inventors: Maiko Saka, Cedric Pitteloud, Tetsuri Nakayama, Kenji Takamori
  • Patent number: 9225007
    Abstract: The present invention provides a positive electrode active material. The positive electrode active material is represented by the following formula (I) and has a BET specific surface area of larger than 5 m2/g and not larger than 15 m2/g: LixM1yM31-yO2??(I) wherein M1 is at least one transition metal element selected from Group 5 elements and Group 6 elements of the Periodic Table, M3 is at least one transition metal element other than M1 and selected from among transition metal elements excluding Fe, x is not less than 0.9 and not more than 1.3, and y is more than 0 and less than 1.
    Type: Grant
    Filed: August 22, 2011
    Date of Patent: December 29, 2015
    Assignee: SUMITOMO CHEMICAL COMPANY, LIMITED
    Inventors: Maiko Saka, Cedric Pitteloud, Tetsuri Nakayama, Kenji Takamori
  • Patent number: 8852805
    Abstract: The present invention provides an electrode active material, an electrode and a non-aqueous electrolyte secondary battery. The electrode active material contains the following powder (A) and powder (B): (A) a powder of a lithium mixed metal oxide that is represented by the following formula (1) and has a layered rock-salt type crystal structure, the powder having a BET specific surface area of from 3 m2/g to 30 m2/g, Li(Ni1?(x+y)MnxFey)O2??(1) wherein x is within a range of more than 0 to less than 1, y is within a range of more than 0 to not more than 0.1, and x+y is within a range of more than 0 to less than 1; (B) a powder of a lithium mixed metal oxide that has a spinel type crystal structure. The electrode contains the electrode active material. The non-aqueous electrolyte secondary battery includes the electrode as a positive electrode.
    Type: Grant
    Filed: December 15, 2010
    Date of Patent: October 7, 2014
    Assignee: Sumitomo Chemical Company, Limited
    Inventors: Maiko Saka, Yuichiro Imanari
  • Patent number: 8795889
    Abstract: The present invention provides a transition metal phosphate and a production process thereof, a positive electrode, and a sodium secondary battery. The transition metal phosphate contains sodium (Na), phosphorus (P) and a transition metal element and having a BET specific surface area of 1 m2/g to 50 m2/g. The process for producing a transition metal phosphate comprises steps (1) and (2): (1) a step of bringing a phosphorus (P) source, a sodium (Na) source, an M source (M is one or more transition metal elements) and water into contact with each other, and obtaining a liquid material thereby, and (2) a step of separating water from the liquid material and obtaining a transition metal phosphate thereby.
    Type: Grant
    Filed: July 7, 2009
    Date of Patent: August 5, 2014
    Assignee: Sumitomo Chemical Company, Limited
    Inventors: Maiko Saka, Yuichiro Imanari, Taketsugu Yamamoto
  • Publication number: 20130164623
    Abstract: The present invention provides a positive electrode active material. The positive electrode active material is represented by the following formula (I) and has a BET specific surface area of larger than 5 m2/g and not larger than 15 m2/g: LixM1yM31-yO2??(I) wherein M1 is at least one transition metal element selected from Group 5 elements and Group 6 elements of the Periodic Table, M3 is at least one transition metal element other than M1 and selected from among transition metal elements excluding Fe, x is not less than 0.9 and not more than 1.3, and y is more than 0 and less than 1.
    Type: Application
    Filed: August 22, 2011
    Publication date: June 27, 2013
    Applicant: SUMITOMO CHEMICAL COMPANY, LIMITED
    Inventors: Maiko Saka, Cedric Pitteloud, Tetsuri Nakayama, Kenji Takamori
  • Publication number: 20120276438
    Abstract: The present invention provides a transition metal phosphate and a production process thereof, a positive electrode, and a sodium secondary battery. The transition metal phosphate contains sodium (Na), phosphorus (P) and a transition metal element and having a BET specific surface area of 1 m2/g to 50 m2/g. The process for producing a transition metal phosphate comprises steps (1) and (2): (1) a step of bringing a phosphorus (P) source, a sodium (Na) source, an M source (M is one or more transition metal elements) and water into contact with each other, and obtaining a liquid material thereby, and (2) a step of separating water from the liquid material and obtaining a transition metal phosphate thereby.
    Type: Application
    Filed: July 7, 2009
    Publication date: November 1, 2012
    Applicant: SUMITOMO CHEMICAL COMPANY, LIMITED
    Inventors: Maiko Saka, Yuichiro Imanari, Taketsugu Yamamoto
  • Publication number: 20120264019
    Abstract: The present invention provides an electrode active material, an electrode and a sodium secondary battery. The electrode active material contains the following powder (A) and powder (B): (A) a powder of a transition metal sodium phosphate, the powder having a BET specific surface area of from 1 m2/g to 100 m2/g, (B) a powder of a mixed metal oxide or a powder of a transition metal lithium phosphate or both. The electrode has the electrode active material. The non-aqueous electrolyte secondary battery has the electrode as a positive electrode.
    Type: Application
    Filed: December 15, 2010
    Publication date: October 18, 2012
    Applicant: SUMITOMO CHEMICAL COMPANY, LIMITED
    Inventor: Maiko Saka
  • Publication number: 20120258351
    Abstract: The present invention provides an electrode active material, an electrode and a non-aqueous electrolyte secondary battery. The electrode active material contains the following powder (A) and powder (B): (A) a powder of a lithium mixed metal oxide that is represented by the following formula (1) and has a layered rock-salt type crystal structure, the powder having a BET specific surface area of from 3 m2/g to 30 m2/g, Li(Ni1-(x+y)MnxFey)O2??(1) wherein x is within a range of more than 0 to less than 1, y is within a range of more than 0 to not more than 0.1, and x+y is within a range of more than 0 to less than 1; (B) a powder of a lithium mixed metal oxide that has a spinel type crystal structure. The electrode contains the electrode active material. The non-aqueous electrolyte secondary battery includes the electrode as a positive electrode.
    Type: Application
    Filed: December 15, 2010
    Publication date: October 11, 2012
    Applicant: SUMITOMO CHEMICAL COMPANY, LIMITED
    Inventors: Maiko Saka, Yuichiro Imanari
  • Publication number: 20120258359
    Abstract: The present invention provides a method for producing an electrode and a method for producing an electrode paste, and a sodium secondary battery.
    Type: Application
    Filed: December 15, 2010
    Publication date: October 11, 2012
    Applicant: Sumitomo Chemical Company, Limited
    Inventor: Maiko Saka
  • Publication number: 20120199785
    Abstract: The present invention provides a transition metal phosphate and a sodium secondary battery. The transition metal phosphate contains Na, P and M where M represents one or more elements selected from the group consisting of transition metal elements, wherein a value of I/I0 determined by the following powder X-ray diffraction measurement is 0.6 or less: the powder X-ray diffraction measurement is a method in which an X-ray diffraction pattern is produced by delivering a Cu K? ray to a mixture composed of the transition metal phosphate and silicon in a transition metal phosphate:silicon weight ratio of 8:1, and then a value of I/I0 is determined by dividing I by I0 where I is the intensity of a maximum peak of the transition metal phosphate and I0 is the intensity of the maximum peak of the silicon in the X-ray diffraction pattern.
    Type: Application
    Filed: October 5, 2010
    Publication date: August 9, 2012
    Applicant: SUMITOMO CHEMICAL COMPANY, LIMITED
    Inventor: Maiko Saka
  • Publication number: 20110135990
    Abstract: Disclosed is a sodium secondary battery. The sodium secondary battery comprises a first electrode and a second electrode comprising a carbonaceous material. The carbonaceous material satisfies one or more requirements selected from the group consisting of requirements 1, 2, 3 and 4. Requirement 1: R value (=ID/IG) obtained by Raman spectroscopic measurement is 1.07 to 3. Requirement 2: A value and ?A value obtained by small angle X-ray scattering measurement are ?0.5 to 0 and 0 to 0.010, respectively. Requirement 3: for an electrode comprising an electrode mixture obtained by mixing 85 parts by weight of the carbonaceous material with 15 parts by weight of poly(vinylidene fluoride), the carbonaceous material in the electrode after being doped and dedoped with sodium ions is substantially free from pores having a size of not less than 10 nm. Requirement 4: Q1 value obtained by a calorimetric differential thermal analysis is not more than 800 joules/g.
    Type: Application
    Filed: July 29, 2009
    Publication date: June 9, 2011
    Applicant: SUMITOMO CHEMICAL COMPANY, LIMITED
    Inventors: Taketsugu Yamamoto, Hideaki Nakajima, Hiroshi Inukai, Shigekazu Ohmori, Chikara Murakami, Daisuke Nakaji, Hidekazu Yoshida, Maiko Saka
  • Publication number: 20110117415
    Abstract: The present invention provides a nonaqueous electrolyte secondary battery. The nonaqueous electrolyte secondary battery comprises a positive electrode containing a positive electrode active material capable of being doped and dedoped with alkali metal ions and represented by formula AxMyPO4, and a negative electrode. In the above formula, A is one or more alkali metal elements, M is one or more transition metal elements, x is more than 0 and not more than 1.5, y is from 0.8 to 1.2, and the positive electrode active material is obtained by bringing a P source, an A source, an M source and water into contact with each other to obtain a liquid material containing AxMyPO4 and then evaporating water from the liquid material.
    Type: Application
    Filed: July 7, 2009
    Publication date: May 19, 2011
    Applicant: SUMITOMO CHEMICAL COMPANY, LIMITED
    Inventors: Maiko Saka, Yuichiro Imanari, Taketsugu Yamamoto