Patents by Inventor Akio Hiwara
Akio Hiwara 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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Patent number: 9209479Abstract: Disclosed is a nonaqueous electrolyte solution containing a sultone compound represented by the Formula 1 below (wherein R1 to R4 respectively represent a hydrogen, a fluorine, a hydrocarbon group with 1 to 12 carbon atoms that may contain fluorine atom(s), n represents an integer of 0 to 3, and when n is 2 or 3, the two or three R3 groups are independent from each other and the two or three R4 groups are independent from each other), and an ethylene carbonate having a hydrogen atom substituted by a fluorine atom. Also disclosed is a lithium secondary battery employing the nonaqueous electrolyte solution. This nonaqueous electrolyte solution does not cause an increase in the internal resistance of a nonaqueous electrochemical device and improves the lifespan characteristics of the device. The lithium secondary battery containing the nonaqueous electrolyte solution exhibits greatly improved cycle charge/discharge characteristics at high temperature, and has excellent charge/discharge load characteristics.Type: GrantFiled: October 12, 2006Date of Patent: December 8, 2015Assignee: MITSUI CHEMICALS, INC.Inventors: Akio Hiwara, Takashi Hayashi
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Patent number: 9130243Abstract: The present invention provides a non-aqueous electrolytic solution for a lithium secondary battery, wherein the lithium secondary battery includes, as a cathode active material, a composite oxide in which at least 35% by mole of a transition metal included in the composite oxide is manganese, and wherein the non-aqueous electrolytic solution includes an unsaturated sultone.Type: GrantFiled: August 5, 2009Date of Patent: September 8, 2015Assignee: MITSUI CHEMICALS, INC.Inventors: Hidenobu Nogi, Akio Hiwara
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Patent number: 8124272Abstract: A polyvinyl acetal resin varnish which is so low in stimulus property, toxicity, environment-polluting property, offensive odor, and inflammability that no problem is caused in practical use, and which is high in safety, low in viscosity, and thus favorable in workability, and an application of the polyvinyl acetal resin varnish are provided. As an organic solvent for dissolving the polyvinyl acetal resin, there is used a nonaqueous solvent, preferably carbonate ester, and more preferably a mixed solvent composed of cyclic carbonate ester and chain carbonate ester, into which the polyvinyl acetal resin is evenly dissolved regardless of its type, resulting in varnish which is high in safety and low in viscosity. Since the varnish has an action of gelling the organic solvent, the varnish can be used as a gelling agent in various applications.Type: GrantFiled: January 14, 2005Date of Patent: February 28, 2012Assignee: Mitsui Chemicals, Inc.Inventors: Akio Hiwara, Takashi Hayashi, Kuniyuki Takamatsu
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Publication number: 20110136018Abstract: The present invention provides a non-aqueous electrolytic solution including an organosilicon compound having a metal atom, a phosphorus atom or a boron atom, and a fluorine-containing alkali metal salt, wherein the content of a fluorinated organosilicon compound generated by reaction of the organosilicon compound and the fluorine-containing alkali metal salt in the non-aqueous electrolytic solution is 0.2% by mass or less.Type: ApplicationFiled: August 5, 2009Publication date: June 9, 2011Applicant: Mitsui Chemicals, Inc.Inventors: Hidenobu Nogi, Takashi Hayashi, Akio Hiwara
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Publication number: 20110136006Abstract: The present invention provides a non-aqueous electrolytic solution for a lithium secondary battery, wherein the lithium secondary battery includes, as a cathode active material, a composite oxide in which at least 35% by mole of a transition metal included in the composite oxide is manganese, and wherein the non-aqueous electrolytic solution includes an unsaturated sultone.Type: ApplicationFiled: August 5, 2009Publication date: June 9, 2011Applicant: Mitsui Chemicals Inc.Inventors: Hidenobu Nogi, Akio Hiwara
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Publication number: 20090253044Abstract: Obtained are a nonaqueous electrolyte solution suitable for a lithium secondary battery having a high energy density, wherein a decrease in the capacity due to charge/discharge cycles is remarkably small and no gas is generated when charging or storing the battery; and a lithium secondary battery using the same. This nonaqueous electrolyte solution is a solution containing a nonaqueous solvent, the nonaqueous solvent containing a fluorinated solvent including a linear fluorinated carbonate (a1) and a fluorinated ethylene carbonate (a2), and the total amount of the fluorinated solvent in the nonaqueous solvent is in the range of from 50 to 100 weight %.Type: ApplicationFiled: October 10, 2006Publication date: October 8, 2009Applicant: MITSUI CHEMICALS, INC.Inventors: Hidenobu Nogi, Akio Hiwara
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Publication number: 20090226808Abstract: Disclosed is a nonaqueous electrolyte solution containing a sultone compound represented by the Formula 1 below (wherein R1 to R4 respectively represent a hydrogen, a fluorine, a hydrocarbon group with 1 to 12 carbon atoms that may contain fluorine atom(s), n represents an integer of 0 to 3, and when n is 2 or 3, the two or three R3 groups are independent from each other and the two or three R4 groups are independent from each other), and an ethylene carbonate having a hydrogen atom substituted by a fluorine atom. Also disclosed is a lithium secondary battery employing the nonaqueous electrolyte solution. This nonaqueous electrolyte solution does not cause an increase in the internal resistance of a nonaqueous electrochemical device and improves the lifespan characteristics of the device. The lithium secondary battery containing the nonaqueous electrolyte solution exhibits greatly improved cycle charge/discharge characteristics at high temperature, and has excellent charge/discharge load characteristics.Type: ApplicationFiled: October 12, 2006Publication date: September 10, 2009Applicant: MITSUI CHEMICALS, INC.Inventors: Akio Hiwara, Takashi Hayashi
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Publication number: 20080090145Abstract: A polyvinyl acetal resin varnish which is so low in stimulus property, toxicity, environment-polluting property, offensive odor, and inflammability that no problem is caused in practical use, and which is high in safety, low in viscosity, and thus favorable in workability, and an application of the polyvinyl acetal resin varnish are provided. As an organic solvent for dissolving the polyvinyl acetal resin, there is used a nonaqueous solvent, preferably carbonate ester, and more preferably a mixed solvent composed of cyclic carbonate ester and chain carbonate ester, into which the polyvinyl acetal resin is evenly dissolved regardless of its type, resulting in varnish which is high in safety and low in viscosity. Since the varnish has an action of gelling the organic solvent, the varnish can be used as a gelling agent in various applications.Type: ApplicationFiled: January 14, 2005Publication date: April 17, 2008Inventors: Akio Hiwara, Takashi Hayashi, Kuniyuki Takamatsu
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Patent number: 7128998Abstract: A nonaqueous electrolyte secondary battery includes an electrode group prepared by winding spirally or in a flattened shape a laminate structure including a separator interposed between positive and negative electrodes, and a nonaqueous electrolyte held by the electrode group, wherein an edge portion of the separator in a direction perpendicular to a winding direction protrudes outward from edges of the positive and negative electrodes in the direction perpendicular to the winding direction, and the separator satisfies conditions given by formulas (1) to (3) given below: 0?X1?(Y1/1.5)?10??(1) X2?10??(2) X2?Y2?20.Type: GrantFiled: February 28, 2005Date of Patent: October 31, 2006Assignee: Kabushiki Kaisha ToshibaInventors: Takashi Shimoyamada, Fumihata Yamamoto, Koichi Kawamura, Takashi Hayashi, Akio Hiwara
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Publication number: 20050196664Abstract: A nonaqueous electrolyte secondary battery includes an electrode group prepared by winding spirally or in a flattened shape a laminate structure including a separator interposed between positive and negative electrodes, and a nonaqueous electrolyte held by the electrode group, wherein an edge portion of the separator in a direction perpendicular to a winding direction protrudes outward from edges of the positive and negative electrodes in the direction perpendicular to the winding direction, and the separator satisfies conditions given by formulas (1) to (3) given below: 0?X1?(Y1/1.Type: ApplicationFiled: February 28, 2005Publication date: September 8, 2005Inventors: Takashi Shimoyamada, Fumihata Yamamoto, Koichi Kawamura, Takashi Hayashi, Akio Hiwara
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Patent number: 6180800Abstract: Monofluoromethyl ethylene carbonate, difluoromethyl ethylene carbonate and trifluoromethyl ethylene carbonate are provided as novel compounds. These compounds are very useful as solvents because they are chemically and physically stable, have a high dielectric constant, can readily dissolve organic substances and have a wide application temperature range. These compounds have excellent charge and discharge cycle characteristics, have a high flash point, and are safe as non-aqueous elecytrolytes. Hence, batteries using these compounds withstand voltage and have excellent charge and discharge cycle characteristics.Type: GrantFiled: November 9, 1999Date of Patent: January 30, 2001Assignee: Mitsui Chemicals, Inc.Inventors: Keiichi Yokoyama, Takako Koiso, Akio Hiwara
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Patent number: 6010806Abstract: Monofluoromethyl ethylene carbonate, difluoromethyl ethylene carbonate and trifluoromethyl ethylene carbonate are provided as novel compounds. These compounds are very useful as solvents because they are chemically and physically stable, have a high dielectric constant, can dissolve well organic substances and have a wide application temperature range. These compounds are excellent in charge and discharge cycle characteristics, have a high flash point, and are safe as non-aqueous elecytrolytes and hence, batteries using these compounds are excellent in withstand voltage and charge and discharge cycle characteristics.Type: GrantFiled: February 6, 1997Date of Patent: January 4, 2000Assignee: Mitsui Chemicals, Inc.Inventors: Keiichi Yokoyama, Takako Sasano, Akio Hiwara
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Patent number: 5977277Abstract: The novel acrylic ester, allyl ether and allyl carbonate of the present invention are characterized by having the structures represented by the following general formulae (I) to (IV): The above acrylic ester, allyl ether and allyl carbonate are used as a starting monomer which forms a polymer matrix for use in a polymeric solid electrolyte. The novel polymer of the present invention comprises structural units derived from at least one compound selected from a group of the compounds represented by the above general formulae (I) to (IV). The polymeric solid electrolyte comprising the above novel polymer as a polymer matrix exhibits high ionic conductivity and is chemically stable.Type: GrantFiled: April 25, 1997Date of Patent: November 2, 1999Assignee: Mitsui Petrochemical Industries, LtdInventors: Keiichi Yokoyama, Takako Sasano, Akio Hiwara, Masahiro Toriida, Satoko Mita, Masayoshi Watanabe
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Patent number: 5925283Abstract: The present invention relates to an ionically conductive polymeric gel electrolyte for batteries having high ionic conductivity and sufficiently high solid strength. The invention has an object to provide a solid battery which prevents internal short-circuiting even if no diaphragm is used and which has high reliability, by using the ionically conductive polymeric gel electrolyte. Disclosed is an ionically conductive polymeric gel electrolyte, containing at least a polymer matrix, a non-aqueous electrolytic solution and an electrolytic salt, wherein at least one kind of a halogen-substituted carbonic ester is contained as a solvent of the non-aqueous electrolytic solution. Also disclosed is a solid battery having the ionically conductive polymeric gel electrolyte as a constituent.Type: GrantFiled: August 7, 1997Date of Patent: July 20, 1999Assignees: Mitsui Chemicals, Inc., Ricoh Company, Ltd.Inventors: Masahiro Taniuchi, Tomohiro Inoue, Toshiyuki Ohsawa, Keiichi Yokoyama, Akio Hiwara, Masahiro Toriida
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Patent number: 5922888Abstract: A process for removing a diol from a cyclic carbonic acid ester containing the diol as an impurity, which comprises bringing a cyclic carbonic acid ester containing a diol as an impurity into contact with a synthetic zeolite in the presence of a chain carbonic acid ester. According to this process, there can be obtained a mixture of a cyclic carbonic acid ester and a chain carbonic acid ester having a very small content of diol, which is suitable as a solvent for electrolytic solution of a condenser, cell or battery.Type: GrantFiled: March 29, 1996Date of Patent: July 13, 1999Assignee: Mitsui Petrochemical Industries, Ltd.Inventors: Masahiro Toriida, Akio Hiwara, Keiichi Yokoyama
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Patent number: 5847188Abstract: A novel carbonate compound represented by the general formula ?I!:R.sup.1 CH.sub.2 O--CO--OCH.sub.2 R.sup.2 ?I!wherein R.sup.1 represents a hydrogen atom, an alkyl group or an alkyl group substituted with one or more halogen atoms, and R.sup.2 represent an alkyl group having no hydrogen atom at the .alpha.-position thereof or an alkyl group substituted with one or more halogen atoms having no hydrogen atom at the .alpha.-position thereof, with the proviso that R.sup.1 is not identical to R.sup.2, which has excellent properties as solvent, is disclosed. A non-aqueous electrolytic solution and a battery utilizing the novel carbonate compound are also disclosed.Type: GrantFiled: April 17, 1997Date of Patent: December 8, 1998Assignee: Mitsui Chemicals, Inc.Inventors: Keiichi Yokoyama, Akio Hiwara, Shigeru Fujita, Atsuo Omaru
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Patent number: 5659062Abstract: A novel carbonate compound represented by the general formula [I]:R.sup.1 CH.sub.2 O--CO--OCH.sub.2 R.sup.2 [I]wherein R.sup.1 represents a hydrogen atom, an alkyl group or an alkyl group substituted with one or more halogen atoms, and R.sup.2 represents an alkyl group having no hydrogen atom at the .alpha.-position thereof or an alkyl group substituted with one or more halogen atoms having no hydrogen atom at the .alpha.-position thereof, with the proviso that R.sup.1 is not identical to R.sup.2, which has excellent properties as solvent, is disclosed. A non-aqueous electrolytic solution and a battery utilizing the novel carbonate compound are also disclosed.Type: GrantFiled: June 7, 1995Date of Patent: August 19, 1997Assignees: Mitsui Petrochemical Industries, Ltd., Sony CorporationInventors: Keiichi Yokoyama, Akio Hiwara
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Patent number: 5633099Abstract: A novel carbonate compound represented by the general formula [I]:R.sup.3 CH.sub.2 O-CO-OCH.sub.2 R.sup.4 [I]wherein R.sup.3 represents an alkyl group or an alkyl group substituted with one or more halogen atoms, and R.sup.4 represent an alkyl group having no hydrogen atom at the .beta.-position thereof or an alkyl group substituted with one or more halogen atoms having no hydrogen atom at the .beta.-position thereof, with the proviso that R.sup.3 is not identical to R.sup.4, which has excellent properties as solvent, is disclosed. A non-aqueous electrolytic solution and a battery utilizing the novel carbonate compound are also disclosed.Type: GrantFiled: June 5, 1995Date of Patent: May 27, 1997Assignees: Mitsui Petrochemical Industries, Ltd., Sony CorporationInventors: Keiichi Yokoyama, Akio Hiwara, Shigeru Fujita, Atsuo Omaru
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Patent number: 5580684Abstract: A non-aqueous electrolytic solutions which has self-distinguishing property, low reactivity to metal lithium and high withstand voltage is provided. The non-aqueous electrolytic solutions of the first invention comprise, as electrolyte, lithium salt preferably LiPF.sub.6 and, as solvent, phosphoric acid esters of the following general formula [1]; ##STR1## wherein R.sup.1, R.sup.2 and R.sup.3, which may be the same or different, represent an alkyl group or an alkyl group substituted by one or more halogen atoms and at least one of R.sup.1, R.sup.2, and R.sup.3 represents an alkyl group substituted by one or more halogen atoms. The non-aqueous electrolytic solutions of the second invention comprise, as solvents for electrolyte, trimethyl phosphate, one or more linear carbonates represented by the following general formula [3]; ##STR2## (wherein R.sup.6 represents methyl or ethyl group and R.sup.Type: GrantFiled: July 7, 1995Date of Patent: December 3, 1996Assignees: Mitsui Petrochemical Industries, Ltd., Sony CorporationInventors: Keiichi Yokoyama, Shigeru Fujita, Akio Hiwara, Yoshiaki Naruse, Masahiro Toriida, Atsuo Omaru
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Patent number: 5385794Abstract: Disclosed are a solvent for cell electrolyte comprising a carbamate represented by the following formula [1]; ##STR1## wherein R.sup.1, R.sup.2 and R.sup.3 independently represent a linear or branched alkyl group, cell electrolyte and non-aqueous electrolyte battery comprising the solvent. The solvent can provide batteries showing high withstand voltage and excellent charge/discharge efficiency.Type: GrantFiled: June 17, 1993Date of Patent: January 31, 1995Assignees: Mitsui Petrochemical Industries Ltd., Sony Corp.Inventors: Keiichi Yokoyama, Akio Hiwara, Shigeru Fujita, Atsuo Omaru