Patents by Inventor Masaki Kuratsuka
Masaki Kuratsuka 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: 20240047829Abstract: A secondary battery includes a positive electrode, a negative electrode, and a separator. The separator is interposed between the positive electrode and the negative electrode. The separator includes a porous layer, a first adhesion layer, and a second adhesion layer. The first adhesion layer is provided between the porous layer and the positive electrode, and is adhered to the positive electrode. The second adhesion layer is provided between the porous layer and the negative electrode, and is adhered to the negative electrode. After the separator is heated at a heating temperature of 130° C.±5° C. for a heating time of one hour, an adhesion strength of the first adhesion layer with respect to the positive electrode is larger than an adhesion strength of the first adhesion layer with respect to the porous layer, and an adhesion strength of the second adhesion layer with respect to the negative electrode is larger than an adhesion strength of the second adhesion layer with respect to the porous layer.Type: ApplicationFiled: October 13, 2023Publication date: February 8, 2024Inventors: Takamasa ONO, Masaki KURATSUKA, Takashige FUJIKAWA, Takeo ASANUMA, Ami ONUMA, Kazuya MAYUMI, Masumi FUKUDA, Yosuke KONO, Atsushi OUKI, Ippei WAKI, Sho TAKAHASHI
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Publication number: 20240030538Abstract: A battery unit includes a battery cell, and a metal case in which a battery cell is stored, the metal case including a bottom surface, and a first side wall and a second side wall erected from a peripheral edge of the bottom surface and having inner surfaces opposing each other, in which the first side wall and the second side wall protrude further than an upper surface of the battery cell, and a distance between an inner surface of the first side wall and an inner surface of the second side wall is larger on an end side, which is an opposite side to a bottom surface side, than on the bottom surface side.Type: ApplicationFiled: September 21, 2023Publication date: January 25, 2024Inventors: Kenichi OZAWA, Masaki KURATSUKA, Josh CHIANG, Ken CHEN
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Publication number: 20230137208Abstract: A secondary battery includes a positive electrode, a negative electrode, and an electrolytic solution. The positive electrode includes a lithium-nickel composite oxide. The negative electrode includes a lithium-titanium composite oxide. The electrolytic solution includes a carboxylic acid ester. The carboxylic acid ester includes at least one of ethyl acetate, propyl acetate, ethyl propionate, or propyl propionate. A first oxygen spectrum and a second oxygen spectrum are detectable by a surface analysis of the positive electrode by X-ray photoelectron spectroscopy. The first oxygen spectrum has a peak within a range of binding energy that is greater than or equal to 528 eV and less than or equal to 531 eV. The second oxygen spectrum has a peak within a range of binding energy that is greater than 531 eV and less than or equal to 535 eV. A ratio of an intensity of the first oxygen spectrum to an intensity of the second oxygen spectrum is greater than or equal to 0.30 and less than or equal to 0.80.Type: ApplicationFiled: December 29, 2022Publication date: May 4, 2023Inventors: Takatoshi MUNAOKA, Shinichi KATAYAMA, Atsushi OUKI, Masaki KURATSUKA, Takashige FUJIKAWA, Yousuke SHIMA
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Patent number: 11600869Abstract: A battery pack supplies an electrically driven treatment apparatus with an electric driving power and includes: a first stack limiting structure and a second stack limiting structure, wherein the second stack limiting structure is disposed opposite and with a fixed distance to the first stack limiting structure; a plurality of pouch cells, wherein the pouch cells are disposed in a stack, wherein the stack is disposed between the first stack limiting structure and the second stack limiting structure and a height of the stack in a stack direction is limited by the first stack limiting structure and the second stack limiting structure; and a sensor arrangement. The sensor arrangement is disposed in the stack. The sensor arrangement extends across a major part of a surface of the pouch cells and is configured such that the height of the stack across the extension is approximately equal. The sensor arrangement has a pressure sensor.Type: GrantFiled: May 8, 2020Date of Patent: March 7, 2023Assignees: Andreas Stihl AG & Co. KG, Murata Manufacturing Co., Ltd.Inventors: Daniel Sauerteig, Julien Scholl, Kenichi Ozawa, Takayuki Sato, Daiki Misawa, Yosuke Kono, Masaki Kuratsuka
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Publication number: 20230058100Abstract: A secondary battery includes a positive electrode, a negative electrode, and an electrolytic solution. The positive electrode includes a positive electrode active material layer. The positive electrode active material layer includes a lithium-nickel composite oxide of a layered rock-salt type.Type: ApplicationFiled: October 20, 2022Publication date: February 23, 2023Inventors: Ami ONUMA, Atsushi OUKI, Masahiro MIYAMOTO, Takuju HASHIMOTO, Tomomi SAKUMA, Masaki KURATSUKA, Takashige FUJIKAWA, Ryuji SOEDA, Sho TAKAHASHI, Yoshihito AKIYAMA, Yosuke KONO, Takamasa ONO, Shoichi NISHIYAMA, Takeo ASANUMA, Shinji HAYAZAKI
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Publication number: 20230053792Abstract: A secondary battery includes a positive electrode, a negative electrode, and an electrolytic solution. The positive electrode includes a positive electrode active material layer. The positive electrode active material layer includes a lithium-nickel composite oxide of a layered rock-salt type.Type: ApplicationFiled: October 20, 2022Publication date: February 23, 2023Inventors: Masumi FUKUDA, Atsushi OUKI, Atsushi NEMOTO, Takamasa ONO, Masaki KURATSUKA, Takashige FUJIKAWA, Ryuji SOEDA, Sho TAKAHASHI, Yoshihito AKIYAMA, Yosuke KONO, Shoichi NISHIYAMA, Takeo ASANUMA, Shinji HAYAZAKI
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Publication number: 20230052704Abstract: A secondary battery includes a positive electrode, a negative electrode, and an electrolytic solution. The positive electrode includes a positive electrode active material layer. The positive electrode active material layer includes a lithium-nickel composite oxide of a layered rock-salt type.Type: ApplicationFiled: October 20, 2022Publication date: February 16, 2023Inventors: Takamasa ONO, Atsushi OUKI, Masaki KURATSUKA, Takashige FUJIKAWA, Ryuji SOEDA, Sho TAKAHASHI, Yoshihito AKIYAMA, Yosuke KONO, Shoichi NISHIYAMA, Takeo ASANUMA, Shinji HAYAZAKI
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Publication number: 20210367230Abstract: A positive electrode active material for a secondary battery includes a center part and a covering part. The center part includes a layered rock-salt lithium-nickel composite oxide. The covering part covers a surface of the center part and includes a boron compound. The positive electrode active material has a crystallite size of a (104) plane that is greater than or equal to 40.0 nm and less than or equal to 74.5 nm. The crystallite size is calculated by X-ray diffractometry and Scherrer equation. The positive electrode active material has a specific surface area that satisfies a condition represented by ?0.0160×Z+1.72?A??0.0324×Z+2.94 where Z is the crystallite size (nm), and A is the specific surface area (m2/g). The specific surface area is measured by BET specific surface area measurement method.Type: ApplicationFiled: August 4, 2021Publication date: November 25, 2021Inventors: Atsushi OUKI, Susumu ENDO, Shinji HAYAZAKI, Sho TAKAHASHI, Takashige FUJIKAWA, Masaki KURATSUKA
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Patent number: 10868327Abstract: A secondary battery includes a negative electrode including a plurality of first negative electrode active material particles, second negative electrode active material particles, and a negative electrode binder. The first negative electrode active material particles include a carbon material, and the second negative electrode active material particles include a silicon material. The negative electrode binder includes polyvinylidene fluoride and at least a part of the negative electrode binder is provided on a part of the surface of each of the second negative electrode active material particles. A ratio M2/M1 of an abundance M2 of the negative electrode binder on the surface and in proximity to each of the second negative electrode active material particles to an abundance M1 of the negative electrode binder on the surface and in proximity to each of the first negative electrode active material particles is larger than 1.Type: GrantFiled: August 29, 2018Date of Patent: December 15, 2020Assignee: Murata Manufacturing Co., Ltd.Inventors: Tadashi Matsushita, Mitsuhiro Ue, Masaki Kuratsuka
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Publication number: 20200358145Abstract: A battery pack supplies an electrically driven treatment apparatus with an electric driving power and includes: a first stack limiting structure and a second stack limiting structure, wherein the second stack limiting structure is disposed opposite and with a fixed distance to the first stack limiting structure; a plurality of pouch cells, wherein the pouch cells are disposed in a stack, wherein the stack is disposed between the first stack limiting structure and the second stack limiting structure and a height of the stack in a stack direction is limited by the first stack limiting structure and the second stack limiting structure; and a sensor arrangement. The sensor arrangement is disposed in the stack. The sensor arrangement extends across a major part of a surface of the pouch cells and is configured such that the height of the stack across the extension is approximately equal. The sensor arrangement has a pressure sensor.Type: ApplicationFiled: May 8, 2020Publication date: November 12, 2020Inventors: Daniel SAUERTEIG, Julien SCHOLL, Kenichi OZAWA, Takayuki SATO, Daiki MISAWA, Yosuke KONO, Masaki KURATSUKA
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Patent number: 10826112Abstract: A negative electrode active material includes a carbon material; a plurality of first particles including a first silicon oxide particle and a carbon layer and a plurality of second particles including a carbon particle and a second silicon oxide particle, and when a first mass of the first silicon oxide particle per gram of the negative electrode active material is referred to as M1 gram, and a second mass of the second silicon oxide particle per gram of the negative electrode active material is referred to as M2 grams, 0.40?M1/(M1+M2)?0.85 is satisfied, and when a first discharge capacity associated with the carbon material and the carbon particle is referred to as CpC, and a second discharge capacity associated with the first silicon oxide particle and the second silicon oxide particle is referred to as CpSO, 0.15?CpSO/(CpC+CpSO)?0.5 is satisfied.Type: GrantFiled: May 9, 2018Date of Patent: November 3, 2020Assignee: Murata Manufacturing Co., Ltd.Inventors: Tadashi Matsushita, Masaki Kuratsuka
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Patent number: 10727530Abstract: A positive electrode includes first active material particles, second active material particles, and third active material particles, and the second active material particles include an aggregation of second primary particles. The average particle size D1 of the first active material particles, the average particle size D2 of the second active material particles, and the average particle size D3 of the third active material particles satisfy a relationship of D1>D2>D3. A first particle disintegration rate ?1 of the first active material particle and a third particle disintegration rate ?2 of the third active material particle are not more than 20%, and a second particle disintegration rate ? of the second active material particle is not less than 70%.Type: GrantFiled: June 5, 2018Date of Patent: July 28, 2020Assignee: Murata Manufacturing Co., Ltd.Inventors: Tadashi Matsushita, Yuya Akiyama, Atsushi Ouki, Takashi Sato, Masaki Kuratsuka
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Patent number: 10707539Abstract: A battery is provided including an anode, a cathode and an electrolyte; wherein the electrolyte includes one or both of fluoro ethylene carbonate and difluoro ethylene carbonate in an amount of 0.5% by mass or more and 10% by mass or less, wherein the anode includes an anode active material layer provided on an anode current collector, and wherein a thickness of the anode active material layer, after charging the battery, is 58 um or more and 75 um or less.Type: GrantFiled: November 17, 2017Date of Patent: July 7, 2020Assignee: Murata Manufacturing Co., Ltd.Inventors: Akira Yamaguchi, Kunihiko Hayashi, Tadahiko Kubota, Hiroyuki Suzuki, Akira Ichihashi, Yuzuru Fukushima, Hironori Sato, Masaki Kuratsuka, Hideto Watanabe, Kimio Tajima, Masahiro Miyamoto
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Patent number: 10403882Abstract: The present invention provides a secondary battery-use active material that allows for an improvement in thermal stability after charge and discharge are repeated. The secondary battery-use active material of the present invention includes a cathode active material that includes (A) a main phase and a sub-phase, (B) the main phase containing a first lithium compound represented by LiaNibMcAldOe (where M is an element such as cobalt, and 0.8<a<1.2, 0.45?b?1, 0?c?1, 0?d?0.2, 0<e?1.98, (c+d)>0, and (b+c+d)?1), and (C) the sub-phase containing a second lithium compound that contains lithium, aluminum, and oxygen as constituent elements.Type: GrantFiled: October 26, 2015Date of Patent: September 3, 2019Assignee: Murata Manufacturing Co., Ltd.Inventors: Takaaki Matsui, Kyohei Ogawa, Masaki Kuratsuka
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Publication number: 20190027783Abstract: A secondary battery includes a negative electrode including a plurality of first negative electrode active material particles, second negative electrode active material particles, and a negative electrode binder. The first negative electrode active material particles include a carbon material, and the second negative electrode active material particles include a silicon material. The negative electrode binder includes polyvinylidene fluoride and at least a part of the negative electrode binder is provided on a part of the surface of each of the second negative electrode active material particles. A ratio M2/M1 of an abundance M2 of the negative electrode binder on the surface and in proximity to each of the second negative electrode active material particles to an abundance M1 of the negative electrode binder on the surface and in proximity to each of the first negative electrode active material particles is larger than 1.Type: ApplicationFiled: August 29, 2018Publication date: January 24, 2019Inventors: Tadashi MATSUSHITA, Mitsuhiro UE, Masaki KURATSUKA
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Publication number: 20180316054Abstract: A negative electrode active material includes a carbon material; a plurality of first particles including a first silicon oxide particle and a carbon layer and a plurality of second particles including a carbon particle and a second silicon oxide particle, and when a first mass of the first silicon oxide particle per gram of the negative electrode active material is referred to as M1 gram, and a second mass of the second silicon oxide particle per gram of the negative electrode active material is referred to as M2 grams, 0.40?M1/(M1+M2)?0.85 is satisfied, and when a first discharge capacity associated with the carbon material and the carbon particle is referred to as CpC, and a second discharge capacity associated with the first silicon oxide particle and the second silicon oxide particle is referred to as CpSO, 0.15?CpSO/(CpC+CpSO)?0.Type: ApplicationFiled: May 9, 2018Publication date: November 1, 2018Inventors: Tadashi MATSUSHITA, Masaki KURATSUKA
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Publication number: 20180287202Abstract: A positive electrode includes first active material particles, second active material particles, and third active material particles, and the second active material particles include an aggregation of second primary particles. The average particle size D1 of the first active material particles, the average particle size D2 of the second active material particles, and the average particle size D3 of the third active material particles satisfy a relationship of D1>D2>D3. A first particle disintegration rate ?1 of the first active material particle and a third particle disintegration rate ?2 of the third active material particle are not more than 20%, and a second particle disintegration rate ? of the second active material particle is not less than 70%.Type: ApplicationFiled: June 5, 2018Publication date: October 4, 2018Inventors: Tadashi MATSUSHITA, Yuya AKIYAMA, Atsushi OUKI, Takashi SATO, Masaki KURATSUKA
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Publication number: 20180076490Abstract: A battery is provided including an anode, a cathode and an electrolyte; wherein the electrolyte includes one or both of fluoro ethylene carbonate and difluoro ethylene carbonate in an amount of 0.5% by mass or more and 10% by mass or less, wherein the anode includes an anode active material layer provided on an anode current collector, and wherein a thickness of the anode active material layer, after charging the battery, is 58 um or more and 75 um or less.Type: ApplicationFiled: November 17, 2017Publication date: March 15, 2018Inventors: Akira Yamaguchi, Kunihiko Hayashi, Tadahiko Kubota, Hiroyuki Suzuki, Akira Ichihashi, Yuzuru Fukushima, Hironori Sato, Masaki Kuratsuka, Hideto Watanabe, Kimio Tajima, Masahiro Miyamoto
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Patent number: 9831532Abstract: The present application provides a nonaqueous electrolyte secondary battery that includes, a cathode capable of being electrochemically doped/dedoped with lithium, an anode capable of being electrochemically doped/dedoped with lithium, and an electrolyte placed between the cathode and the anode, wherein the electrolyte contains at least one of fluoro ethylene carbonate represented by Chemical Formula (1) and difluoro ethylene carbonate represented by Chemical Formula (2) as a solvent and the ratio of a discharge capacity B during discharging at a 5C rate to a discharge capacity A during discharging at a 0.2C rate ((B/A)×100) is 80% or more.Type: GrantFiled: November 19, 2013Date of Patent: November 28, 2017Assignee: Sony CorporationInventors: Akira Yamaguchi, Kunihiko Hayashi, Tadahiko Kubota, Hiroyuki Suzuki, Akira Ichihashi, Yuzuru Fukushima, Hironori Sato, Masaki Kuratsuka, Hideto Watanabe, Kimio Tajima, Masahiro Miyamoto
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Publication number: 20170309891Abstract: The present invention provides a secondary battery-use active material that allows for an improvement in thermal stability after charge and discharge are repeated. The secondary battery-use active material of the present invention includes a cathode active material that includes (A) a main phase and a sub-phase, (B) the main phase containing a first lithium compound represented by LiaNibMcAldOe (where M is an element such as cobalt, and 0.8<a<1.2, 0.45?b?1, 0?c?1, 0?d?0.2, 0<e?1.98, (c+d)>0, and (b+c+d)?1), and (C) the sub-phase containing a second lithium compound that contains lithium, aluminum, and oxygen as constituent elements.Type: ApplicationFiled: October 26, 2015Publication date: October 26, 2017Applicant: Sony CorporationInventors: Takaaki MATSUI, Kyohei OGAWA, Masaki KURATSUKA