Patents by Inventor Kenta Nakai
Kenta Nakai 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: 20160064775Abstract: Provided is an energy storage device including an electrolyte solution including a compound represented by the general formula (1), a compound represented by the general formula (2), and a compound represented by the general formula (3):Type: ApplicationFiled: August 24, 2015Publication date: March 3, 2016Inventors: Tomonori KAKO, Sumio MORI, Akihiko MIYAZAKI, Kenta NAKAI
-
Publication number: 20150349326Abstract: An energy storage device comprising: a positive electrode, a negative electrode, a separator disposed between the positive electrode and the negative electrode, a nonaqueous electrolyte, and an insulating layer disposed between the positive electrode and the separator, wherein the positive electrode contains a compound represented by LiaNibCocMdWxNbyZrzO2 (provided that a, b, c, d, x, y and z satisfy the equations of 0?a?1.2, 0?b?1, 0.1?c?0.4, 0?d?0.5, 0?x?0.1, 0?y?0.1, 0?z?0.1 and b+c+d=1, and M denotes at least one kind of element selected from the group consisting of Mn, Ti, Cr, Fe, Co, Cu, Zn, Al, Ge, Sn and Mg) as a positive active material and the negative electrode contains hardly graphitizable carbon with a D50 particle diameter greater than or equal to 1.0 ?m and less than or equal to 6.0 ?m as a negative active material.Type: ApplicationFiled: May 27, 2015Publication date: December 3, 2015Inventors: Akihiko MIYAZAKI, Sumio MORI, Tomonori KAKO, Kenta NAKAI
-
ENERGY STORAGE DEVICE, ENERGY STORAGE APPARATUS, VEHICLE, AND METHOD FOR USING ENERGY STORAGE DEVICE
Publication number: 20150340677Abstract: An energy storage device comprises a positive electrode, a negative electrode, a separator arranged between the positive electrode and the negative electrode, and a nonaqueous electrolyte. The negative electrode has a negative substrate layer, and a negative composite layer arranged on the surface of the negative substrate layer. The separator has a separator substrate layer. The negative composite layer contains a non-graphitizable carbon having a particle diameter D50 of 2.0 ?m or more and 6.0 ?m or less. A corrected negative electrode density, which is defined as a value obtained by dividing, by a thickness of the separator substrate layer, a value obtained by multiplying a density of the negative composite layer by a thickness of the negative composite layer, is 1.2 (g/cm3) or more and 5.1 (g/cm3) or less.Type: ApplicationFiled: May 22, 2015Publication date: November 26, 2015Inventors: Akihiko MIYAZAKI, Sumio MORI, Tomonori KAKO, Kenta NAKAI -
Publication number: 20150340737Abstract: A method including: a placing step of placing an electrode assembly including a positive electrode that contains a positive active material and a negative electrode that contains a negative active material, and an electrolyte solution containing an additive in a container; a charging step of charging the electrode assembly placed in the container; and a hermetically sealing step of hermetically sealing the container after the charging step. When starting charging in the charging step, the electrolyte solution contains 1.0 mass % or less of lithium difluoro bis(oxalate)phosphate as the additive. The charge voltage in the charging step is 4.0 V or more.Type: ApplicationFiled: May 19, 2015Publication date: November 26, 2015Inventors: Tomonori KAKO, Sumio MORI, Akihiko MIYAZAKI, Kenta NAKAI
-
Patent number: 9165168Abstract: In order to perform processing of analyzing card data in an appropriate amount of time depending on the number of tracks actually present on a magnetic stripe with use of a single demodulation circuit, the single demodulation circuit produces, based on magnetic data read by a magnetic head, a single common card running signal obtained by ORing card running signals of tracks present on the magnetic stripe of the magnetic card, a clock signal of each track present on the magnetic stripe, and a data signal of each track present on the magnetic stripe. A card running signal generation circuit generates, based on the common card running signal and the clock signal of each track, an individual card running signal of each track present on the magnetic stripe.Type: GrantFiled: February 21, 2013Date of Patent: October 20, 2015Assignee: NEC Platforms, Ltd.Inventors: Takanori Suzuki, Yuichiro Yamada, Kenta Nakai
-
Publication number: 20150147625Abstract: The electric storage device includes: an electrode assembly; and an electrolytic solution at least part of which is impregnated into the electrode assembly, wherein the electrode assembly includes, as electrode assembly forming members, at least a positive electrode and a negative electrode that face each other, and contains lithium carbonate, the electrolytic solution contains at least lithium hexafluorophosphate, at least one of the positive electrode and the negative electrode includes an active material layer containing a metal compound, the active material layer includes a peripheral area and an inner area inside the peripheral area, the electrode assembly includes a high-content part the ratio of lithium carbonate content of which is higher than that of the inner area.Type: ApplicationFiled: November 28, 2014Publication date: May 28, 2015Inventors: Kenta Nakai, Takeshi Sasaki
-
Publication number: 20150102107Abstract: In order to perform processing of analyzing card data in an appropriate amount of time depending on the number of tracks actually present on a magnetic stripe with use of a single demodulation circuit, the single demodulation circuit produces, based on magnetic data read by a magnetic head, a single common card running signal obtained by ORing card running signals of tracks present on the magnetic stripe of the magnetic card, a clock signal of each track present on the magnetic stripe, and a data signal of each track present on the magnetic stripe. A card running signal generation circuit generates, based on the common card running signal and the clock signal of each track, an individual card running signal of each track present on the magnetic stripe.Type: ApplicationFiled: February 21, 2013Publication date: April 16, 2015Applicant: NEC INFRONTIA CORPORATIONInventors: Takanori Suzuki, Yuichiro Yamada, Kenta Nakai
-
Publication number: 20150093647Abstract: A battery includes a positive electrode, a negative electrode including a negative active material layer containing hardly-graphitizable carbon as a negative active material and an aqueous binder, a separator disposed between the positive electrode and the negative electrode, and a nonaqueous electrolyte. The negative active material layer has a density of not less than 0.81 g/cc and not more than 1.01 g/cc. The negative active material has a particle size D90 of not less than 1.9 ?m and not more than 11.5 ?m, the particle size D90 being a particle size at which the cumulative volume is 90% in the particle size distribution.Type: ApplicationFiled: September 26, 2014Publication date: April 2, 2015Inventors: Tomonori KAKO, Sumio MORI, Akihiko MIYAZAKI, Kenta NAKAI
-
Publication number: 20150092320Abstract: An electric storage device having a positive electrode, a negative electrode, a separator located between the positive electrode and the negative electrode, and a nonaqueous electrolyte. The positive electrode has a positive substrate layer, a positive composite layer containing a positive active material, and an undercoat layer located between the positive substrate layer and the positive composite layer. A density of the positive composite layer is 2.1 g/cm3 or more and 2.7 g/cm3 or less. The positive electrode has the rate of increase in sheet resistance after a solvent immersion test of 30% or less. The undercoat layer contains a binder selected from the group consisting of chitosan derivatives, cellulose derivatives and acrylic acid derivatives.Type: ApplicationFiled: September 26, 2014Publication date: April 2, 2015Inventors: Akihiko MIYAZAKI, Sumio MORI, Tomonori KAKO, Kenta NAKAI
-
Publication number: 20150093620Abstract: An electric storage device includes: an electrode assembly in which electrodes are wound such that paired curved portions and a straight portion connecting the paired curved portions are formed; a case which houses the electrode assembly, the case comprising a convex part protruding toward the straight portion of the electrode assembly to support the straight portion; and a support portion which supports the curved portion toward an inside of the electrode assembly.Type: ApplicationFiled: October 1, 2014Publication date: April 2, 2015Inventors: Akihiko MIYAZAKI, Sumio Mori, Tomonori Kako, Kenta Nakai
-
Patent number: 8986881Abstract: An energy storage element, wherein a non-aqueous electrolyte contains lithium difluorobis(oxalato)phosphate that is a first additive represented by Formula (1): and lithium tetrafluorooxalatophosphate that is a second additive represented by Formula (2): wherein the amount of the first additive to be added is not less than 0.3% by weight and not more than 1.0% by weight based on the total weight of the non-aqueous electrolyte, and the amount of the second additive to be added is not less than 0.05 times and not more than 0.3 times the amount of the first additive to be added.Type: GrantFiled: January 11, 2013Date of Patent: March 24, 2015Assignee: GS Yuasa International Ltd.Inventors: Tomonori Kako, Sumio Mori, Kenta Nakai, Akihiko Miyazaki
-
Publication number: 20140377629Abstract: In the state where a positive electrode and a separator are held in a case, the value of the ratio of the tensile elongation in a first direction of the separator to the tensile elongation in the first direction of a positive electrode substrate is from 4 to 68. In the same state, the value of the ratio of the tensile elongation in a second direction of the separator to the tensile elongation in the second direction of the positive electrode substrate is from 4 to 68. The value of the ratio of the thickness of a heat-resistant layer to the thickness of the positive electrode substrate is from 0.25 to 0.70. The proportion by mass of heat-resistant particles contained in the heat-resistant layer is from 30 to 99% by mass of the heat-resistant layer.Type: ApplicationFiled: June 16, 2014Publication date: December 25, 2014Inventors: Akihiko MIYAZAKI, Sumio Mori, Tomonori Kako, Kenta Nakai
-
Publication number: 20140370393Abstract: Provided is an energy storage device provided with a negative electrode including a negative substrate having a surface, and a negative composite layer formed on the surface of the negative substrate and including a negative active material; a positive electrode including a positive substrate, and a positive composite layer formed on the positive substrate and including a positive active material; and a separator placed between the positive electrode and the negative electrode. 10% cumulative diameter D10 in the particle size distribution of the negative active material on a volume basis is 1.3 ?m or more, and 90% cumulative diameter D90 in the particle size distribution of the negative active material on a volume basis is 8.9 ?m or less. The surface of the negative substrate has a center line roughness Ra of 0.205 ?m or more and 0.781 ?m or less, and has a center line roughness Ra to a ten-point mean height Rz of 0.072 or more and 0.100 or less.Type: ApplicationFiled: June 16, 2014Publication date: December 18, 2014Inventors: Kenta Nakai, Akihiko MIYAZAKI, Tomonori KAKO, Sumio MORI
-
Publication number: 20140295220Abstract: An electric storage device is provided with an electrode assembly including a positive electrode plate and a negative electrode plate; a case for housing the electrode assembly; a positive-electrode external terminal arranged on an outer surface of the case and electrically connected to the positive electrode plate; a negative-electrode external terminal arranged on an outer surface of the case and electrically connected to the negative electrode plate; and a gas exhaust valve formed in a region of the case on the opposite side of a region where the positive-electrode external terminal and the negative-electrode external terminal are arranged.Type: ApplicationFiled: March 27, 2014Publication date: October 2, 2014Applicant: GS Yuasa International Ltd.Inventors: Sumio Mori, Tomonori Kako, Akihiko Miyazaki, Kenta Nakai
-
Publication number: 20140154557Abstract: An energy storage device including a positive electrode, a negative electrode, a separator disposed between the positive electrode and the negative electrode, and a non-aqueous electrolyte, wherein the negative electrode includes a negative electrode active material layer containing a non-graphitizable carbon as a negative electrode active material, and the negative electrode active material has a negative electrode active material weight per unit volume of the negative electrode active material layer of 0.92 g/cc or more and 1.13 g/cc or less and a particle size D90 of 4.3 ?m or more and 11.5 ?m or less, the particle size D90 being a particle size in particle size distribution in which a cumulative volume is 90%.Type: ApplicationFiled: December 2, 2013Publication date: June 5, 2014Applicant: GS Yuasa International Ltd.Inventors: Sumio MORI, Kenta Nakai, Akihiko Miyazaki, Tomonori Kako
-
Publication number: 20140154559Abstract: An energy storage unit having plural energy storage devices, each of which includes a container housing an electrode assembly and positive and negative electrode terminals electrically connected to the electrode assembly and extending from the container in the same direction, includes: a bus bar electrically connecting a first terminal, which is one of the positive electrode terminal and the negative electrode terminal of a first energy storage device included in the plural energy storage devices, and a second terminal, which is one of the positive electrode terminal and the negative electrode terminal of a second energy storage device included in the plural energy storage devices and opposite in polarity to the first terminal; a packing member interposed between the first terminal and the container of the first energy storage device; and an insulating member interposed between the bus bar and the container of the first energy storage device.Type: ApplicationFiled: December 2, 2013Publication date: June 5, 2014Applicant: GS Yuasa International Ltd.Inventors: Sumio Mori, Tomonori Kako, Akihiko Miyazaki, Kenta Nakai
-
Publication number: 20140017549Abstract: An energy storage device including a positive electrode, a negative electrode, a separator disposed between the positive electrode and the negative electrode, and a non-aqueous electrolyte, wherein the negative electrode includes non-graphitizable carbon as a negative electrode active material, and the separator has a thickness of 10 to 30 ?m and an air permeability of 10 to 180 sec/100 cc.Type: ApplicationFiled: July 9, 2013Publication date: January 16, 2014Inventors: Akihiko Miyazaki, Sumio Mori, Tomonori Kako, Kenta Nakai