Patents by Inventor Chikae Yoshimaru
Chikae Yoshimaru 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: 20230285906Abstract: A gas separation membrane selectively permeable to a specific gas component includes a first porous layer, and a separation function layer provided on a first surface of the first porous layer. The separation function layer contains a hydrophilic resin. The first surface has a wetting tension of greater than or equal to 38 mN/m and less than or equal to 52 mN/m.Type: ApplicationFiled: June 25, 2021Publication date: September 14, 2023Applicant: SUMITOMO CHEMICAL COMPANY, LIMITEDInventors: Keisuke TOYAMA, Kensuke KAWARA, Chikae YOSHIMARU, Shohei KASAHARA
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Patent number: 11205799Abstract: The present invention provides a nonaqueous electrolyte secondary battery in which a decrease in discharge capacity after a charge-discharge cycle is reduced. The nonaqueous electrolyte secondary battery in accordance with an aspect of the present invention includes (i) a positive electrode plate and a negative electrode plate whose results of a scratch test carried out in the TD and the MD fall within predetermined ranges, (ii) a nonaqueous electrolyte secondary battery separator that includes a porous film whose temperature rise ending period with respect to a resin amount per unit area at irradiation with microwave falls within a predetermined range, and (iii) a porous layer that contains an ?-form polyvinylidene fluoride-based resin of a polyvinylidene fluoride-based resin at a predetermined proportion. The porous layer is arranged between the nonaqueous electrolyte secondary battery separator and at least one of the positive electrode plate and the negative electrode plate.Type: GrantFiled: December 18, 2018Date of Patent: December 21, 2021Assignee: SUMITOMO CHEMICAL COMPANY, LIMITEDInventors: Kosuke Kurakane, Toshihiko Ogata, Chikae Yoshimaru, Chikara Murakami
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Patent number: 10957941Abstract: A nonaqueous electrolyte secondary battery which satisfies four requirements is provided. A porous layer contains ?-form polyvinylidene fluoride-based resin in an amount of not less than 35.0 mol % with respect to 100 mol % of a total amount of (i) the ?-form polyvinylidene fluoride-based resin and (ii) ?-form polyvinylidene fluoride-based resin. A porous film has a temperature rise ending period of 2.9 sec·m2/g to 5.7 sec·m2/g with respect to an amount of a resin per unit area when the porous film is impregnated with N-methylpyrrolidone containing water in an amount of 3% by weight and then (ii) irradiated, at an output of 1,800 W, with a microwave having a frequency of 2,455 MHz. A positive electrode plate has a capacitance of 1 nF to 1000 nF per measurement area of 900 mm2. A negative electrode plate has a capacitance of 4 nF to 8500 nF per measurement area of 900 mm2.Type: GrantFiled: December 19, 2018Date of Patent: March 23, 2021Assignee: SUMITOMO CHEMICAL COMPANY, LIMITEDInventors: Ichiro Arise, Toshihiko Ogata, Chikae Yoshimaru, Chikara Murakami
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Patent number: 10661528Abstract: Provided is a separator including a first later consisting of a porous polyolefin and a secondary battery utilizing the separator. The first layer exhibits a temperature-increase convergence time equal to or longer than 2.9 s·m2/g and equal to or shorter than 5.7 s·m2/g when the first layer is irradiated with a microwave having a frequency of 2455 MHz and an output power of 1800 W after being dipped in N-methylpyrrolidone containing 3 wt % of water. A minimum height of a ball placed over the first layer and having a diameter of 14.3 mm and a weight of 11.9 g is equal to or more than 50 cm and equal to or less than 150 cm, the minimum height causing a split in the first layer when the ball freely falls on the first layer.Type: GrantFiled: October 24, 2016Date of Patent: May 26, 2020Assignee: SUMITOMO CHEMICAL COMPANY, LIMITEDInventors: Chikae Yoshimaru, Chikara Murakami, Takahiro Okugawa
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Publication number: 20200152943Abstract: To provide a nonaqueous electrolyte secondary battery separator that allows a nonaqueous electrolyte secondary battery including the nonaqueous electrolyte secondary battery separator to have a reduced increase in the battery resistance after a charge and discharge cycle, a nonaqueous electrolyte secondary battery separator is arranged such that the number of bends is not less than 1600, the number having been measured (i) with use of a test piece of a polyolefin porous film which test piece has a longitudinal direction in a transverse direction (TD) of the polyolefin porous film and (ii) by an MIT tester method, the bends having been carried out until a longitudinal dimension of the test piece changes by 2.4 cm.Type: ApplicationFiled: January 14, 2020Publication date: May 14, 2020Inventor: Chikae YOSHIMARU
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Patent number: 10637030Abstract: The present invention provides a nonaqueous electrolyte secondary battery insulating porous layer having an excellent charge resistance characteristic. The nonaqueous electrolyte secondary battery insulating porous layer has a fractal dimension of 2.42 to 2.60, the fractal dimension being calculated from a three-dimensional image showing a void part and a porous layer part on respective two gradation levels, the three-dimensional image being prepared by analyzing images of cross sections obtained by making observation at intervals of 20 nm in a thickness direction from a surface of the nonaqueous electrolyte secondary battery insulating porous layer by FIB-SEM measurement at a magnification of 6500 times.Type: GrantFiled: May 12, 2017Date of Patent: April 28, 2020Assignee: SUMITOMO CHEMICAL COMPANY, LIMITEDInventors: Syusaku Hara, Chikae Yoshimaru, Junji Suzuki, Hiroki Hashiwaki
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Publication number: 20200070470Abstract: Provided is a separator including a first later consisting of a porous polyolefin and a secondary battery utilizing the separator. The first layer exhibits a temperature-increase convergence time equal to or longer than 2.9 s·m2/g and equal to or shorter than 5.7 s·m2/g when the first layer is irradiated with a microwave having a frequency of 2455 MHz and an output power of 1800 W after being dipped in N-methylpyrrolidone containing 3 wt % of water. A minimum height of a ball placed over the first layer and having a diameter of 14.3 mm and a weight of 11.9 g is equal to or more than 50 cm and equal to or less than 150 cm, the minimum height causing a split in the first layer when the ball freely falls on the first layer.Type: ApplicationFiled: October 24, 2016Publication date: March 5, 2020Inventors: Chikae YOSHIMARU, Chikara MURAKAMI, Takahiro OKUGAWA
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Patent number: 10566594Abstract: The present invention provides a nonaqueous electrolyte secondary battery separator which is excellent in cycle characteristic. The nonaqueous electrolyte secondary battery separator includes a polyolefin porous film in which a difference between (i) a porosity calculated from a continuous image which is formed so as to extend from a surface to an inside of the polyolefin porous film in a thickness direction and in which a void part and a resin part are shown at respective two gray levels and (ii) a porosity calculated from a thickness, a weight per unit area, and a real density of the polyolefin porous film is 4% to 20%.Type: GrantFiled: March 2, 2018Date of Patent: February 18, 2020Assignee: SUMITOMO CHEMICAL COMPANY, LIMITEDInventors: Chikae Yoshimaru, Syusaku Hara, Daizaburo Yashiki
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Publication number: 20190252658Abstract: A separator and a secondary battery including the separator are described. The separator includes a first layer consisting of porous polyolefin. A temperature-increase convergence time to the amount of a resin in the first layer per unit area is at least 2.9 s·m2/g and equal to or shorter than 5.7 s·m2/g when the layer is irradiated with a microwave (frequency 2455 MHz, output of 1800W) after being impregnated with N-methylpyrrolidone containing 3 wt % of water. The tearing strength of the first layer measured by the Elmendorf tearing method (JIS K 7128-2) is at least 1.5 mN/?m, and a tensile elongation value of the first layer is at least 0.5 mm until a load decreases to 25% of a maximum load from when the load reaches the maximum load in a load-elongation curve in the tearing strength measurement (JIS K 7128-3) by the right-angled tearing method.Type: ApplicationFiled: October 24, 2016Publication date: August 15, 2019Inventors: Chikae YOSHIMARU, Chikara MURAKAMI, Tomoaki OZEKI
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Publication number: 20190245181Abstract: Provided is a separator including a separator which consists of a porous polyolefin of 95 wt % or more and an organic additive. A temperature-increase convergence time of the first layer is equal to or longer than 2.9 s·m2/g and equal to or shorter than 5.7 s·m2/g when the first layer is irradiated with a microwave having a frequency of 2455 MHz and an output power of 1800 W after dipping the first layer in N-methylpyrrolidone containing 3 wt % of water, whereas a white index is equal to or more than 86 and equal to or less than 98.Type: ApplicationFiled: October 24, 2016Publication date: August 8, 2019Inventors: Chikae YOSHIMARU, Chikara MURAKAMI, Junji SUZUKI
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Patent number: 10361418Abstract: To afford a laminated body that is usable as a nonaqueous electrolyte secondary battery separator and that is not easily curled, a laminated body includes: a porous base material containing a polyolefin-based resin as a main component; and a porous layer containing a polyvinylidene fluoride-based resin, the porous base material having a temperature rise ending period of a particular value with respect to the amount of resin per unit area, the polyvinylidene fluoride-based resin containing crystal form ? in an amount of not less than 36 mol % with respect to 100 mol % of a total amount of the crystal form ? and crystal form ? contained in the polyvinylidene fluoride-based resin.Type: GrantFiled: June 20, 2017Date of Patent: July 23, 2019Assignee: SUMITOMO CHEMICAL COMPANY, LIMITEDInventors: Toshihiko Ogata, Chikae Yoshimaru, Chikara Murakami
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Publication number: 20190190074Abstract: A nonaqueous electrolyte secondary battery satisfies the following requirements: (a) in a PVDF-based resin contained in a porous layer, a content of an ?-form PVDF-based resin is above 35.0 mol % with respect to 100 mol % of a total content of ?- and ?-form PVDF-based resins; (b) a porous film has a temperature rise ending time of 2.9-5.7 seconds·m2/g with respect to a resin content per area, wherein the porous film is impregnated with N-methylpyrrolidone containing 3% by weight of water and is irradiated with a 2455 MHz 1800 W microwave; (c) a positive electrode plate, before peeling of its active material layer has more than 130 bends in a folding endurance test with a 1 N load and a 45° bending angle; and (d) a negative electrode plate, before peeling of its active material layer occurs has more than 1650 bends in the folding endurance test.Type: ApplicationFiled: December 18, 2018Publication date: June 20, 2019Inventors: Kosuke KURAKANE, Toshihiko OGATA, Chikae YOSHIMARU, Chikara MURAKAMI
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Publication number: 20190190077Abstract: The present invention provides a nonaqueous electrolyte secondary battery in which a good high-rate discharge capacity after charge-discharge cycles is maintained. The nonaqueous electrolyte secondary battery in accordance with an aspect of the present invention includes: (i) a combination of a positive electrode plate and a negative electrode plate in which the sum of interface barrier energies is not less than a predetermined value, (ii) a nonaqueous electrolyte secondary battery separator that includes a porous film whose temperature rise ending period with respect to a resin amount per unit area at irradiation with microwave falls within a predetermined range, and (iii) a porous layer that contains an ?-form polyvinylidene fluoride-based resin of a polyvinylidene fluoride-based resin at a predetermined proportion. The porous layer is provided between the nonaqueous electrolyte secondary battery separator and at least one of the positive electrode plate and the negative electrode plate.Type: ApplicationFiled: December 18, 2018Publication date: June 20, 2019Inventors: Ichiro ARISE, Toshihiko OGATA, Chikae YOSHIMARU, Chikara MURAKAMI
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Publication number: 20190190081Abstract: A nonaqueous electrolyte secondary battery which satisfies four requirements is provided. A porous layer contains ?-form polyvinylidene fluoride-based resin in an amount of not less than 35.0 mol % with respect to 100 mol % of a total amount of (i) the ?-form polyvinylidene fluoride-based resin and (ii) ?-form polyvinylidene fluoride-based resin. A porous film has a temperature rise ending period of 2.9 sec·m2/g to 5.7 sec·m2/g with respect to an amount of a resin per unit area when the porous film is impregnated with N-methylpyrrolidone containing water in an amount of 3% by weight and then (ii) irradiated, at an output of 1,800 W, with a microwave having a frequency of 2,455 MHz. A positive electrode plate has a capacitance of 1 nF to 1000 nF per measurement area of 900 mm2. A negative electrode plate has a capacitance of 4 nF to 8500 nF per measurement area of 900 mm2.Type: ApplicationFiled: December 19, 2018Publication date: June 20, 2019Inventors: Ichiro ARISE, Toshihiko OGATA, Chikae YOSHIMARU, Chikara MURAKAMI
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Publication number: 20190190090Abstract: The present invention provides a nonaqueous electrolyte secondary battery in which a decrease in discharge capacity after a charge-discharge cycle is reduced. The nonaqueous electrolyte secondary battery in accordance with an aspect of the present invention includes (i) a positive electrode plate and a negative electrode plate whose results of a scratch test carried out in the TD and the MD fall within predetermined ranges, (ii) a nonaqueous electrolyte secondary battery separator that includes a porous film whose temperature rise ending period with respect to a resin amount per unit area at irradiation with microwave falls within a predetermined range, and (iii) a porous layer that contains an ?-form polyvinylidene fluoride-based resin of a polyvinylidene fluoride-based resin at a predetermined proportion. The porous layer is arranged between the nonaqueous electrolyte secondary battery separator and at least one of the positive electrode plate and the negative electrode plate.Type: ApplicationFiled: December 18, 2018Publication date: June 20, 2019Inventors: Kosuke KURAKANE, Toshihiko OGATA, Chikae YOSHIMARU, Chikara MURAKAMI
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Publication number: 20190036096Abstract: Provided is a nonaqueous electrolyte secondary battery separator including a porous film containing polyolefin as a main component, the nonaqueous electrolyte secondary battery separator having a time until temperature rise cessation with respect to an amount of resin per unit area of 2.9 sec·m2/g to 5.7 sec·m2/g, the time being obtained in a case where the nonaqueous electrolyte secondary battery separator is impregnated with N-methylpyrrolidone containing 3 wt % water and is subsequently irradiated, at an output of 1,800 W, with a microwave having a frequency of 2,455 MHz, the nonaqueous electrolyte secondary battery separator having an excellent initial rate characteristic and being capable of preventing a deterioration in rate characteristic which deterioration is caused by repeated charge and discharge.Type: ApplicationFiled: October 3, 2018Publication date: January 31, 2019Inventors: Chikae YOSHIMARU, Chikara MURAKAMI
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Publication number: 20180301681Abstract: The present invention provides a nonaqueous electrolyte secondary battery insulating porous layer having an excellent charge resistance characteristic. The nonaqueous electrolyte secondary battery insulating porous layer has a fractal dimension of 2.42 to 2.60, the fractal dimension being calculated from a three-dimensional image showing a void part and a porous layer part on respective two gradation levels, the three-dimensional image being prepared by analyzing images of cross sections obtained by making observation at intervals of 20 nm in a thickness direction from a surface of the nonaqueous electrolyte secondary battery insulating porous layer by FIB-SEM measurement at a magnification of 6500 times.Type: ApplicationFiled: May 12, 2017Publication date: October 18, 2018Inventors: Syusaku HARA, Chikae YOSHIMARU, Junji SUZUKI, Hiroki HASHIWAKI
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Publication number: 20180254454Abstract: To provide a nonaqueous electrolyte secondary battery separator that allows a nonaqueous electrolyte secondary battery including the nonaqueous electrolyte secondary battery separator to have a reduced increase in the battery resistance after a charge and discharge cycle, a nonaqueous electrolyte secondary battery separator is arranged such that the number of bends is not less than 1600, the number having been measured (i) with use of a test piece of a polyolefin porous film which test piece has a longitudinal direction in a transverse direction (TD) of the polyolefin porous film and (ii) by an MIT tester method, the bends having been carried out until a longitudinal dimension of the test piece changes by 2.4 cm.Type: ApplicationFiled: March 2, 2018Publication date: September 6, 2018Inventor: Chikae YOSHIMARU
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Publication number: 20180254453Abstract: As a nonaqueous electrolyte secondary battery separator that is excellent in initial battery resistance characteristic of a nonaqueous electrolyte secondary battery including the nonaqueous electrolyte secondary battery separator, provided is a nonaqueous electrolyte secondary battery separator including: a polyolefin porous film, the polyolefin porous film having an internal fractal dimension of 1.75 to 1.91, the internal fractal dimension being measured, by a box counting method, in accordance with a continuous image of the polyolefin porous film which continuous image is formed so as to extend from a surface of the polyolefin porous film in an internal thickness direction of the polyolefin porous film, and in which continuous image a void part and a resin part of the polyolefin porous film are shown at respective two gray levels.Type: ApplicationFiled: March 2, 2018Publication date: September 6, 2018Inventors: Chikae YOSHIMARU, Syusaku HARA, Chikara MURAKAMI
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Publication number: 20180254455Abstract: The present invention provides a nonaqueous electrolyte secondary battery separator which is excellent in cycle characteristic. The nonaqueous electrolyte secondary battery separator includes a polyolefin porous film in which a difference between (i) a porosity calculated from a continuous image which is formed so as to extend from a surface to an inside of the polyolefin porous film in a thickness direction and in which a void part and a resin part are shown at respective two gray levels and (ii) a porosity calculated from a thickness, a weight per unit area, and a real density of the polyolefin porous film is 4% to 20%.Type: ApplicationFiled: March 2, 2018Publication date: September 6, 2018Inventors: Chikae YOSHIMARU, Syusaku HARA, Daizaburo YASHIKI