Patents by Inventor Daisuke Kawasaki
Daisuke Kawasaki 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: 20130157120Abstract: The object of an exemplary embodiment of the invention is to provide a secondary battery with a high performance in which the generation of the swelling can be suppressed and in which the cycle property is excellent. An exemplary embodiment of the invention is a secondary battery, comprising an electrode assembly in which a positive electrode and a negative electrode are oppositely disposed, an electrolyte liquid, and a package which encloses the electrode assembly and the electrolyte liquid inside; wherein the negative electrode is formed by binding a negative electrode active substance, which comprises metal (a) that can be alloyed with lithium, metal oxide (b) that can absorb and desorb lithium ion, and carbon material (c) that can absorb and desorb lithium ion, to a negative electrode collector with at least one selected from polyimides and a polyamide-imides; and wherein the electrolyte liquid comprises a compound represented by any one of predetermined formulae.Type: ApplicationFiled: June 23, 2011Publication date: June 20, 2013Applicant: NEC CORPORATIONInventors: Midori Shimura, Daisuke Kawasaki, Masahiro Suguro, Yoko Hashizume, Kazuaki Matsumoto
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Publication number: 20130157119Abstract: An object is to provide a secondary battery in which decomposition of an electrolyte liquid is suppressed and generation of a gas is reduced, even in the case of using a laminate film as a package. Further, the present exemplary embodiment provides a secondary battery of stacked laminate type comprising an electrode assembly in which a positive electrode and a negative electrode are arranged to face each other, an electrolyte liquid and a package accommodating the electrode assembly and said electrolyte liquid, wherein the negative electrode is formed by binding a negative electrode active substance comprising a metal (a) capable of being alloyed with lithium, a metal oxide (b) capable of occluding and releasing lithium ions and a carbon material (c) capable of occluding and releasing lithium ions, to a negative electrode current collector, with at least one selected from polyimides and polyamideimides, and the electrolyte liquid comprises a predetermined nitrile compound.Type: ApplicationFiled: June 23, 2011Publication date: June 20, 2013Applicant: NEC CORPORATIONInventors: Midori Shimura, Daisuke Kawasaki, Masahiro Suguro, Yoko Hashizume, Kazuaki Matsumoto
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Publication number: 20130122353Abstract: An object of the invention is to provide a secondary battery having satisfactory high-temperature cycle characteristics. The present invention relates to a laminate type secondary battery including an electrode element containing an electrode pair in which a positive electrode and a negative electrode are arranged so as to face each other, an electrolyte and a jacket housing the electrode element and the electrolyte, in which the negative electrode includes a negative-electrode active material containing at least one of a metal (a) capable of forming an alloy with lithium and a metal oxide (b) capable of absorbing and desorbing lithium ions, a negative electrode binder and a negative electrode current collector; the electrolyte contains a nonaqueous solvent and biphenyl; and the content of the biphenyl in the electrolyte is 0.5 to 2.5% by mass, based on the total of the nonaqueous solvent and the biphenyl.Type: ApplicationFiled: August 22, 2011Publication date: May 16, 2013Applicant: NEC CORPORATIONInventors: Daisuke Kawasaki, Masahiro Suguro, Midori Shimura, Kazuaki Matsumoto, Yoko Hashizume
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Publication number: 20130119940Abstract: There is provided a control system for a lithium secondary battery that can quantitatively sense a deterioration state inherent in a lithium secondary battery using silicon oxide as a negative electrode active material, that is, the nonuniform reaction state of a negative electrode.Type: ApplicationFiled: July 20, 2011Publication date: May 16, 2013Applicants: NEC ENERGY DEVICES, LTD., NEC CORPORATIONInventors: Jiro Iriyama, Tetsuya Kajita, Daisuke Kawasaki, Ryuichi Kasahara, Tatsuji Numata
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Publication number: 20130108914Abstract: In a lithium ion secondary battery including a positive electrode, a separator, a negative electrode, and a package body, the negative electrode includes simple substance silicon as a negative electrode active material, and a negative electrode binder, and is doped with lithium, and the following formulas (1) and (2) are satisfied: 1.2?Ma/Mc?1.9??(1) 1.0<Ma/(Mc+MLi)<1.6??(2) wherein an amount of lithium inserted into the negative electrode until the negative electrode reaches a potential of 0.02 V with respect to metal lithium is Ma (a number of atoms), an amount of lithium released from the positive electrode until the positive electrode reaches a potential of 4.3 V with respect to metal lithium is Mc (a number of atoms), and an amount of lithium with which the negative electrode is doped is MLi (a number of atoms).Type: ApplicationFiled: July 29, 2011Publication date: May 2, 2013Applicants: NEC ENERGY DEVICES, LTD., NEC CORPORATIONInventors: Ryuichi Kasahara, Jiro Iriyama, Tetsuya Kajita, Hiroo Takahashi, Tatsuji Numata, Daisuke Kawasaki
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Publication number: 20120321940Abstract: A nonaqueous electrolyte secondary battery according to a present exemplary embodiment comprises an electrode element including a positive electrode and a negative electrode arranged to face each other, a nonaqueous electrolyte and a jacket housing the electrode element and the nonaqueous electrolyte. The negative electrode is formed by bounding a negative electrode active material to a negative electrode collector with a negative electrode binder, the negative electrode active material containing (a) a carbon material capable of intercalating and deintercalating lithium ions, (b) a metal capable of forming an alloy with lithium and (c) a metal oxide capable of intercalating and deintercalating lithium ions. The nonaqueous electrolyte contains a nonaqueous solvent, a cyclic fluorinated carbonate and a linear fluorinated ether.Type: ApplicationFiled: March 9, 2011Publication date: December 20, 2012Inventors: Daisuke Kawasaki, Shinako Kaneko, Jiro Iriyama
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Publication number: 20120244420Abstract: A secondary battery according to the present exemplary embodiment is a secondary battery including a laminated electrode body provided with at least one pair of positive and negative electrodes and an outer enclosure that accommodates the laminated electrode body, wherein the outer enclosure includes one or more concave portions, inside a border corresponding to an outer edge of an electrode surface of an outermost layer of the laminated electrode body, on a surface facing the electrode surface, and wherein, when a band-shaped outer circumferential region having an area that is a half of an area inside the border is set inside the border, at least one of the concave portions is located inside the outer circumferential region.Type: ApplicationFiled: March 21, 2012Publication date: September 27, 2012Applicant: NEC CORPORATIONInventors: Shin SERIZAWA, Hiroo TAKAHASHI, Daisuke KAWASAKI, Jiro IRIYAMA, Ryuichi KASAHARA, Emiko FUJII, Tetsuya KAJITA, Tatsuji NUMATA
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Patent number: 8227116Abstract: A lithium secondary battery which has excellent characteristics such as energy density and electromotive force and is excellent in cycle life and storage stability is provided. The secondary battery comprises a positive electrode, a negative electrode, and an electrolyte solution comprising an aprotic solvent having at least an electrolyte dissolved therein, wherein the positive electrode comprises a lithium-manganese composite oxide having a spinel structure as a positive electrode active material, and the electrolyte solution comprises a compound represented by the general formula (1).Type: GrantFiled: December 14, 2004Date of Patent: July 24, 2012Assignee: NEC CorporationInventors: Daisuke Kawasaki, Yuki Kusachi, Tatsuji Numata, Koji Utsugi
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Publication number: 20120183843Abstract: An exemplary embodiment provides a lithium ion secondary battery using a high energy type anode, which enables long-life operation thereof. A secondary battery according to an exemplary embodiment comprises an electrode element in which a cathode and an anode are oppositely disposed, an electrolytic solution, and an outer packaging body which encloses the electrode element and the electrolytic solution inside; wherein the anode is formed by binding an anode active material, which comprises carbon material (a) that can absorb and desorb a lithium ion, metal (b) that can be alloyed with lithium, and metal oxide (c) that can absorb and desorb a lithium ion, to an anode collector with an anode binder; and wherein the electrolytic solution comprises a liquid medium which is hard to generate carbon dioxide at a concentration of 10 to 80 vol %.Type: ApplicationFiled: September 29, 2010Publication date: July 19, 2012Applicants: NEC CORPORATION, NEC ENERGY DEVICES, LTD.Inventors: Daisuke Kawasaki, Shinako Kaneko, Jiro Iriyama
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Publication number: 20120183842Abstract: An exemplary embodiment provides a lithium ion secondary battery using a high energy type anode, which enables long-life operation thereof. A secondary battery according to an exemplary embodiment comprises an electrode element in which a cathode and an anode are oppositely disposed, an electrolytic solution, and an outer packaging body which encloses the electrode element and the electrolytic solution inside; wherein the anode is formed by binding an anode active material, which comprises carbon material (a) that can absorb and desorb a lithium ion, metal (b) that can be alloyed with lithium, and metal oxide (c) that can absorb and desorb a lithium ion, to an anode collector with an anode binder; and wherein the electrolytic solution comprises a liquid medium which is hard to generate carbon dioxide at a concentration of 10 to 75 vol %.Type: ApplicationFiled: September 29, 2010Publication date: July 19, 2012Applicants: NEC CORPORATION, NEC ENERGY DEVICES, LTD.Inventors: Daisuke Kawasaki, Shinako Kaneko, Jiro Iriyama
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Patent number: 7782766Abstract: The present invention relates to a data collection system and a data collection method in a sensor network, enabling sensor modules to consume lower amounts of power. The base station transmits data collection request signals to one or more sensor modules which are lower than the base station by 1 in a tree structure. Each sensor module which has received the data collection request signal transfers the signal to one or more sensor modules which are lower than the module by 1. The base station regards the transfer of the signal as ACK for the data collection request signal transmitted therefrom to the sensor module which is lower than the base station by 1. The transmission of a data collection acknowledgement signal starts from a sensor module at the low-order end. When a sensor module receives the data collection acknowledgement signal from a downstream sensor module which is lower than the module by 1, the module transmits the signal to an upstream sensor module which is higher than the module by 1.Type: GrantFiled: September 16, 2004Date of Patent: August 24, 2010Assignee: NEC CorporationInventors: Takahiro Ohkuma, Daisuke Kawasaki, Kazuhiko Isoyama
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Publication number: 20100143366Abstract: To provide a pharmaceutical agent or an antitumor agent useful for the treatment and/or prevention of gastrointestinal cancer, leukemia, pituitary tumor, small cell lung cancer, thyroid cancer, and neuroastrocytoma. The antitumor agent containing, as an active ingredient, a 1,5-benzodiazepine derivative represented by the following formula (1): (wherein R1 represents a C1-6 alkyl group; R2 represents a phenyl group or a cyclohexyl group; and Y represents a single bond or a C1-4 alkylene group) or a pharmaceutically acceptable salt thereof.Type: ApplicationFiled: February 18, 2010Publication date: June 10, 2010Applicant: ZERIA PHARMACEUTICAL CO., LTD.Inventors: Koji YOSHINAGA, Daisuke Kawasaki, Yutaka Emori
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Publication number: 20100144365Abstract: The present invention aims at providing a wireless communication system capable of lowering the load of the overload channel in the overload state in consideration of the allocation states of radio channels of adjacent base stations adjacent to the wireless base station. The wireless communication system in accordance with the present invention includes a plurality of wireless base stations (AP) capable of allocating a plurality of radio channels to be used for wireless communication and a load distribution apparatus (1) to conduct load distribution for a radio channel being used in the wireless base stations (AP) wherein the apparatus (1) obtains allocation states of radio channels of the respective wireless base stations (AP) to detect, on the basis of the obtained allocation states, an overload wireless base station (AP) which is using an overload radio channel in an overload state.Type: ApplicationFiled: July 3, 2007Publication date: June 10, 2010Inventors: Huanxu Pan, Daisuke Kawasaki, Satoru Yamano
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Publication number: 20100086553Abstract: To provide a pharmaceutical agent or an antitumor agent useful for the treatment and/or prevention of gastrointestinal cancer, leukemia, pituitary tumor, small cell lung cancer, thyroid cancer, and neuroastrocytoma. The antitumor agent containing, as an active ingredient, a 1,5-benzodiazepine derivative represented by the following formula (1): (wherein R1 represents a C1-6 alkyl group; R2 represents a phenyl group or a cyclohexyl group; and Y represents a single bond or a C1-4 alkylene group) or a pharmaceutically acceptable salt thereof.Type: ApplicationFiled: December 7, 2009Publication date: April 8, 2010Applicant: ZERIA PHARMACEUTICAL CO., LTD.Inventors: Koji YOSHINAGA, Daisuke Kawasaki, Yutaka Emori
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Patent number: 7556889Abstract: A life of a secondary battery is extended, increase in a resistance when storing a secondary battery at an elevated temperature is prevented, and increase in a resistance during a charge-discharge cycle is prevented. A positive electrode active material comprising a lithium manganate and a lithium nickelate are used. The lithium manganate is a compound represented by the following formula (1) or the compound in which some of Mn or O sites are replaced with another element: Li1+xMn2?xO4??(1) (in the above-shown formula (1), 0.15?x?0.24).Type: GrantFiled: May 26, 2004Date of Patent: July 7, 2009Assignee: NEC CorporationInventors: Tomokazu Kumeuchi, Tatsuji Numata, Daisuke Kawasaki
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Publication number: 20080161293Abstract: To provide a pharmaceutical agent or an antitumor agent useful for the treatment and/or prevention of gastrointestinal cancer, leukemia, pituitary tumor, small cell lung cancer, thyroid cancer, and neuroastrocytoma. The antitumor agent containing, as an active ingredient, a 1,5-benzodiazepine derivative represented by the following formula (1): (wherein R1 represents a C1-6 alkyl group; R2 represents a phenyl group or a cyclohexyl group; and Y represents a single bond or a C1-4 alkylene group) or a pharmaceutically acceptable salt thereof.Type: ApplicationFiled: January 16, 2006Publication date: July 3, 2008Applicant: ZERIA PHARMACEUTICAL CO., LTD.Inventors: Koji Yoshinaga, Daisuke Kawasaki, Yutaka Emori
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Patent number: 7336958Abstract: A data transmission path establishing method for establishing a data transmission path from each device to a base station independently to thereby form a network with small devices which are required to consume lower amounts of power such as sensors, a radio communication network system and a sensor network system. A base station transmits detection signals to a plurality of radio devices. Each of the radio devices which have received the detection signal transmits detection response signals each including an identifier that uniquely identifies the device and doubling as a response signal and a detection signal for another radio device. Having received the detection response signal from a radio device, the base station recognizes the radio device as a radio device belonging to the station based on the identifier included in the detection response signal.Type: GrantFiled: September 16, 2004Date of Patent: February 26, 2008Assignee: NEC CorporationInventors: Daisuke Kawasaki, Takehiro Hokimoto, Arata Toyoda, Kazuhiko Isoyama, Takahiro Ohkuma
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Patent number: 7301477Abstract: Disclosed is a telemetering system that comprises a wireless base station and a number of wireless sensor nodes. Each wireless sensor node includes a solar cell, a sensor for producing observation data indicating a quantity being measured, a wireless interface for receiving the observation data from the sensor when the node is activated, and a time-schedule memory for storing time-schedule data. Control circuitry briefly activates its own node by supplying power from the solar cell to the wireless interface at periodic intervals according to the time-schedule data of the memory and briefly establishes a wireless link to the base station. During the time the wireless link is briefly established, the control circuitry of each node transmits the observation data to the base station and updates its time-schedule memory if it receives time-schedule data from the base station.Type: GrantFiled: October 19, 2004Date of Patent: November 27, 2007Assignee: NEC CorporationInventors: Kazuhiko Isoyama, Takahiro Ohkuma, Daisuke Kawasaki
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Publication number: 20070154815Abstract: A lithium secondary battery which has excellent characteristics such as energy density and electromotive force and is excellent in cycle life and storage stability is provided. The secondary battery comprises a positive electrode, a negative electrode, and an electrolyte solution comprising an aprotic solvent having at least an electrolyte dissolved therein, wherein the positive electrode comprises a lithium-manganese composite oxide having a spinel structure as a positive electrode active material, and the electrolyte solution comprises a compound represented by the general formula (1).Type: ApplicationFiled: December 14, 2004Publication date: July 5, 2007Applicant: NEC CORPORATIONInventors: Daisuke Kawasaki, Yuki Kusachi, Tatsuji Numata, Koji Utsugi
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Patent number: 7179566Abstract: A cathode active material for a secondary battery including a lithium-manganese composite oxide having a spinel structure and represented by the following general formula (I), Lia(MxMn2-x-y-zYyAz)(O4-wZw) (I), wherein 0.5?x?1.2, 0?y, 0?z, x+y+z<2, 0?a?1.2 and 0?w?1; M contains at least Co and may further contains at least one element selected from the group consisting of Ni, Fe, Cr and Cu; Y is at least one element selected lo from the group consisting of Li, Be, B, Na, Mg, Al, K and Ca; A is at least one of Ti and Si; and Z is at least one of F and Cl. When the cathode active material for the secondary battery is used as the cathode for the a secondary battery, a higher operating can be realized while suppressing the reliability reduction such as the capacity decrease after the cycles and the deterioration of the crystalline structure at a higher temperature.Type: GrantFiled: March 7, 2003Date of Patent: February 20, 2007Assignee: NEC CorporationInventors: Daisuke Kawasaki, Takehiro Noguchi, Tatsuji Numata