Patents by Inventor Makiko Uehara
Makiko Uehara 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: 10749208Abstract: The object is to provide a lithium ion secondary battery which has an excellent cycle property even in high-temperature environment and which has small volume increase. An exemplary embodiment of the invention is a lithium ion secondary battery, comprising: a positive electrode, a negative electrode comprising a negative electrode active material, and an electrolyte liquid; wherein the electrolyte liquid comprises a chain-type fluorinated ester compound represented by a predetermined formula and a chain-type fluorinated ether compound represented by a predetermined formula; wherein the negative electrode active material 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; and wherein metal (a) is silicon, and metal oxide (b) is silicon oxide.Type: GrantFiled: March 16, 2012Date of Patent: August 18, 2020Assignee: NEC CORPORATIONInventors: Makiko Uehara, Daisuke Kawasaki, Takehiro Noguchi, Akinobu Nakamura, Kenichi Shimura, Yoko Hashizume
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Patent number: 10003100Abstract: A lithium secondary battery including a positive electrode including a positive electrode active material capable of intercalating and deintercalating lithium ions, a negative electrode including a negative electrode active material capable of intercalating and deintercalating lithium ions, and a nonaqueous electrolytic solution, wherein the positive electrode active material includes an active material capable of intercalating or deintercalating lithium ions at a potential of 4.5 V or more, and the nonaqueous electrolytic solution includes a particular fluorine-containing ether compound.Type: GrantFiled: January 16, 2013Date of Patent: June 19, 2018Assignee: NEC CorporationInventors: Takehiro Noguchi, Makiko Uehara
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Publication number: 20170222270Abstract: It is an object of this exemplary embodiment to provide a lithium ion secondary battery using a positive electrode active material having an operating potential of 4.5 V or more, the lithium ion secondary battery having excellent high temperature cycle characteristics. This exemplary embodiment is a lithium ion secondary battery comprising a positive electrode and a negative electrode capable of intercalating and deintercalating lithium, a separator between the positive electrode and the negative electrode, and an electrolytic solution containing a nonaqueous electrolytic solvent, wherein the positive electrode comprises a positive electrode active material operating at a potential of 4.5 V or more versus lithium, the separator comprises cellulose, a cellulose derivative, or a glass fiber, and the nonaqueous electrolytic solvent comprises a fluorinated solvent.Type: ApplicationFiled: April 20, 2017Publication date: August 3, 2017Inventors: Makiko UEHARA, Takehiro Noguchi
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Patent number: 9692085Abstract: It is an object of this exemplary embodiment to provide a lithium ion secondary battery using a positive electrode active material having an operating potential of 4.5 V or more, the lithium ion secondary battery having excellent high temperature cycle characteristics. This exemplary embodiment is a lithium ion secondary battery comprising a positive electrode and a negative electrode capable of intercalating and deintercalating lithium, a separator between the positive electrode and the negative electrode, and an electrolytic solution containing a nonaqueous electrolytic solvent, wherein the positive electrode comprises a positive electrode active material operating at a potential of 4.5 V or more versus lithium, the separator comprises cellulose, a cellulose derivative, or a glass fiber, and the nonaqueous electrolytic solvent comprises a fluorinated solvent.Type: GrantFiled: October 26, 2012Date of Patent: June 27, 2017Assignee: NEC CorporationInventors: Makiko Uehara, Takehiro Noguchi
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Patent number: 9356284Abstract: An active material for a secondary battery whose lifetime characteristics are improved is provided. The active material for a secondary battery includes a first active material represented by Lip[M1mM22-m-nM3n]O4, wherein M1 is at least one selected from Ni, Cr, Fe, Co, and Cu; M2 is at least one selected from Mn, Ti, and Si, and contains Mn; M3 is at least one selected from Li, B, Mg, Al, Na, and Ca; and 0?p, 0<m, 0<n, and m+n<2; and a second active material represented by Liq[LiaXxZzMn1-a-x-z]O2, wherein X is at least one selected from Ni, Cr, Fe, Co, and Cu; Z is at least one selected from Al, Mg, B, Si, Na, Ca, and Ti; and 0?q, 0<a, 0<x, 0?z, and a+x+z<1.Type: GrantFiled: June 15, 2012Date of Patent: May 31, 2016Assignee: NEC CorporationInventors: Takehiro Noguchi, Hideaki Sasaki, Makiko Uehara, Yuukou Katou
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Patent number: 9299475Abstract: A positive electrode active material for a lithium ion secondary battery having high discharge energy and capable of suppressing capacity drop with cycles and a secondary battery using the same are provided at lower cost. A positive electrode active material for a secondary battery according to a first aspect of the exemplary embodiment is represented by the following formula (I): Lia(FexNiyMn2-x-y)O4 (I) where 0.2<x?1.2, 0<y<0.5 and 0?a?1.2. Furthermore, a positive electrode active material for a secondary battery according to a second aspect of the exemplary embodiment is represented by the following formula (II): Lia(FexNiyMn2-x-y-zAz)O4 (II) where 0.2?x?1.2, 0<y<0.5, 0?a?1.2 and 0<z?0.3; A is at least one selected from the group consisting of Li, B, Na, Mg, Al, K and Ca.Type: GrantFiled: November 4, 2011Date of Patent: March 29, 2016Assignee: NEC CORPORATIONInventors: Makiko Uehara, Takehiro Noguchi, Hideaki Sasaki
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Patent number: 9281519Abstract: Provided is a lithium ion positive electrode active material for a secondary battery that can realize a high operating voltage and a high capacity while suppressing capacity drop with cycles by using a low-cost material. A positive electrode active material for a secondary battery, which is a lithium manganese composite oxide represented by the following general formula (I) Lia(MxMn2?x?yYy)(O4?wZw)??(I) wherein in the formula (I), 0.5?x?1.2, 0<y?0.3, 0?a?1.2, and 0<w?1; M contains at least Fe and may further contain at least one selected from the group consisting of Ni, Cr and Cu other than Fe; Y is at least one selected from the group consisting of Li, Be, B, Na, Mg, Al, K, Ca, Ti and Si; and Z is at least one of F and Cl.Type: GrantFiled: July 25, 2011Date of Patent: March 8, 2016Assignee: NEC ENERGY DEVICES, LTD.Inventors: Makiko Uehara, Takehiro Noguchi
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Patent number: 9203111Abstract: The object of an exemplary embodiment of the invention is to provide a secondary battery which contains a positive electrode active material operating at a potential of 4.5 V or higher and which has good cycle property at a high temperature. An exemplary embodiment of the invention is a secondary battery, comprising a positive electrode that can absorb and desorb lithium and an electrolyte liquid; wherein the positive electrode comprises a positive electrode active material that operates at a potential of 4.5 V or higher with respect to lithium; and wherein the electrolyte liquid comprises a fluorinated ether represented by a prescribed formula and a cyclic-type sulfonate represented by a prescribed formula.Type: GrantFiled: September 22, 2011Date of Patent: December 1, 2015Assignee: NEC CORPORATIONInventors: Makiko Uehara, Takehiro Noguchi, Hideaki Sasaki
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Publication number: 20150010831Abstract: A lithium secondary battery including a positive electrode including a positive electrode active material capable of intercalating and deintercalating lithium ions, a negative electrode including a negative electrode active material capable of intercalating and deintercalating lithium ions, and a nonaqueous electrolytic solution, wherein the positive electrode active material includes an active material capable of intercalating or deintercalating lithium ions at a potential of 4.5 V or more, and the nonaqueous electrolytic solution includes a particular fluorine-containing ether compound.Type: ApplicationFiled: January 16, 2013Publication date: January 8, 2015Inventors: Takehiro Noguchi, Makiko Uehara
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Publication number: 20140367610Abstract: An active material for a secondary battery with improved life characteristics is provided. An active material for a secondary battery according to this exemplary embodiment is an active material for a secondary battery represented by Lia1(Nix1Mn2-x1-y1-x1M1y1 M2z1)O4 wherein 0<x1, 0<y1, 0<z1, x1+y1+z1<2, and 0?a1?2; M1 is at least one selected from Si and Ti; and M2 is at least one selected from Li, B, Mg, Na, K, and Ca. In addition, an active material for a secondary battery according to this exemplary embodiment is an active material for a secondary battery represented by Lia2(Nix2Mn2-x2-y2-z2M3y2M4z2)O4 wherein 0<x2, 0<y2, 0<z2<0.03, x2+y2+z2<2, and 0?a2?2; M3 is at least one selected from Si and Ti; and M4 is at least one selected from Li, B, Mg, Al, Na, K, and Ca, and includes at least Al.Type: ApplicationFiled: March 29, 2012Publication date: December 18, 2014Inventors: Takehiro Noguchi, Hideaki Sasaki, Makiko Uehara
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Patent number: 8877090Abstract: There is provided a novel positive electrode active material for a secondary battery. A positive electrode active material for a secondary battery according to the present exemplary embodiment is represented by the following formula (I):Lia(NixCryMn2-x-y-zM1z)O4(I) wherein 0<x, 0<y, 0<z, x+y+z<2, and 0?a?2; and M1 contains at least one selected from the group consisting of Na and Mg. A positive electrode for a secondary battery according to the present exemplary embodiment has the positive electrode active material for a secondary battery according to the present exemplary embodiment.Type: GrantFiled: November 16, 2011Date of Patent: November 4, 2014Assignee: Nec CorporationInventors: Takehiro Noguchi, Hideaki Sasaki, Makiko Uehara
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Publication number: 20140322615Abstract: It is an object of this exemplary embodiment to provide a lithium ion secondary battery using a positive electrode active material having an operating potential of 4.5 V or more, the lithium ion secondary battery having excellent high temperature cycle characteristics. This exemplary embodiment is a lithium ion secondary battery comprising a positive electrode and a negative electrode capable of intercalating and deintercalating lithium, a separator between the positive electrode and the negative electrode, and an electrolytic solution containing a nonaqueous electrolytic solvent, wherein the positive electrode comprises a positive electrode active material operating at a potential of 4.5 V or more versus lithium, the separator comprises cellulose, a cellulose derivative, or a glass fiber, and the nonaqueous electrolytic solvent comprises a fluorinated solvent.Type: ApplicationFiled: October 26, 2012Publication date: October 30, 2014Inventors: Makiko Uehara, Takehiro Noguchi
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Publication number: 20140138575Abstract: An active material for a secondary battery whose lifetime characteristics are improved is provided. The active material for a secondary battery includes a first active material represented by Lip[M1mM22-m-nM3n]O4, wherein M1 is at least one selected from Ni, Cr, Fe, Co, and Cu; M2 is at least one selected from Mn, Ti, and Si, and contains Mn; M3 is at least one selected from Li, B, Mg, Al, Na, and Ca; and 0?p, 0<m, 0<n, and m+n<2; and a second active material represented by Liq[LiaXxZzMn1-a-x-z]O2, wherein X is at least one selected from Ni, Cr, Fe, Co, and Cu; Z is at least one selected from Al, Mg, B, Si, Na, Ca, and Ti; and 0?q, 0<a, 0<x, 0?z, and a+x+z<1.Type: ApplicationFiled: June 15, 2012Publication date: May 22, 2014Inventors: Takehiro Noguchi, Hideaki Sasaki, Makiko Uehara, Yuukou Katou
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Publication number: 20140023935Abstract: Provided is a lithium secondary cell of 5V class having a positive electrode operating voltage of 4.5V or higher with respect to metallic lithium; the lithium secondary cell has high energy density, inhibits degradation of the electrolytic solution that comes in contact with the positive electrode and the negative electrode, and has particularly long cell life when used under high-temperature environments.Type: ApplicationFiled: April 13, 2012Publication date: January 23, 2014Applicant: NEC CorporationInventors: Takehiro Noguchi, Hideaki Sasaki, Makiko Uehara, Kazuaki Matsumoto, Hiroshi Hatakeyama
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Publication number: 20140017572Abstract: The object is to provide a lithium ion secondary battery which has an excellent cycle property even in high-temperature environment and which has small volume increase. An exemplary embodiment of the invention is a lithium ion secondary battery, comprising: a positive electrode, a negative electrode comprising a negative electrode active material, and an electrolyte liquid; wherein the electrolyte liquid comprises a chain-type fluorinated ester compound represented by a predetermined formula and a chain-type fluorinated ether compound represented by a predetermined formula; wherein the negative electrode active material 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; and wherein metal (a) is silicon, and metal oxide (b) is silicon oxide.Type: ApplicationFiled: March 16, 2012Publication date: January 16, 2014Applicant: NEC CORPORATIONInventors: Makiko Uehara, Daisuke Kawasaki, Takehiro Noguchi, Akinobu Nakamura, Kenichi Shimura, Yoko Hashizume
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Publication number: 20130280600Abstract: The object of an exemplary embodiment of the invention is to provide a secondary battery which contains a positive electrode active material operating at a potential of 4.5 V or higher and which has good cycle property at a high temperature. An exemplary embodiment of the invention is a secondary battery, comprising a positive electrode that can absorb and desorb lithium and an electrolyte liquid; wherein the positive electrode comprises a positive electrode active material that operates at a potential of 4.5 V or higher with respect to lithium; and wherein the electrolyte liquid comprises a fluorinated ether represented by a prescribed formula and a cyclic-type sulfonate represented by a prescribed formula.Type: ApplicationFiled: September 22, 2011Publication date: October 24, 2013Applicant: NEC CORPORATIONInventors: Makiko Uehara, Takehiro Noguchi, Hideaki Sasaki
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Publication number: 20130266847Abstract: The object of an exemplary embodiment of the invention is to provide a lithium secondary battery which has high energy density by containing a positive electrode active substance operating at a potential of 4.5 V or higher with respect to lithium and which has excellent cycle property. An exemplary embodiment of the invention is an lithium secondary battery, which comprises a positive electrode comprising a positive electrode active substance and an electrolyte liquid comprising a nonaqueous electrolyte solvent; wherein the positive electrode active substance operates at a potential of 4.5 V or higher with respect to lithium; and wherein the nonaqueous electrolyte solvent comprises a fluorine-containing phosphate represented by a prescribed formula.Type: ApplicationFiled: December 7, 2011Publication date: October 10, 2013Applicants: NEC ENERGY DEVICES, LTD., NEC CORPORATIONInventors: Takehiro Noguchi, Hideaki Sasaki, Makiko Uehara, Ippei Waki, Shinako Kaneko, Hiroshi Hatakeyama, Shinsaku Saitho, Yuukou Katou
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Publication number: 20130221269Abstract: A positive electrode active material for a lithium ion secondary battery having high discharge energy and capable of suppressing capacity drop with cycles and a secondary battery using the same are provided at lower cost. A positive electrode active material for a secondary battery according to a first aspect of the exemplary embodiment is represented by the following formula (I): Lia(FexNiyMn2-x-y)O4 (I) where 0.2<x?1.2, 0<y<0.5 and 0?a?1.2. Furthermore, a positive electrode active material for a secondary battery according to a second aspect of the exemplary embodiment is represented by the following formula (II): Lia(FexNiyMn2-x-y-zAz)O4 (II) where 0.2?x?1.2, 0<y<0.5, 0?a?1.2 and 0<z?0.3; A is at least one selected from the group consisting of Li, B, Na, Mg, Al, K and Ca.Type: ApplicationFiled: November 4, 2011Publication date: August 29, 2013Applicant: NEC CORPORATIONInventors: Makiko Uehara, Takehiro Noguchi, Hideaki Sasaki
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Publication number: 20130168601Abstract: There is provided a novel positive electrode active material for a secondary battery. A positive electrode active material for a secondary battery according to the present exemplary embodiment is represented by the following formula (I): Lia(NixCryMn2-x-y-zM1z)O4??(I) wherein 0<x, 0<y, 0<z, x+y+z<2, and 0?a?2; and M1 contains at least one selected from the group consisting of Na and Mg. A positive electrode for a secondary battery according to the present exemplary embodiment has the positive electrode active material for a secondary battery according to the present exemplary embodiment.Type: ApplicationFiled: November 16, 2011Publication date: July 4, 2013Applicant: NEC CORPORATIONInventors: Takehiro Noguchi, Hideaki Sasaki, Makiko Uehara
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Publication number: 20130136987Abstract: Provided is a lithium ion positive electrode active material for a secondary battery that can realize a high operating voltage and a high capacity while suppressing capacity drop with cycles by using a low-cost material. A positive electrode active material for a secondary battery, which is a lithium manganese composite oxide represented by the following general formula (I) Lia(MxMn2-x-yYy)(O4-wZw) ??(I) wherein in the formula (I), 0.5?x?1.2, 0<y?0.3, 0?a?1.2, and 0<w?1; M contains at least Fe and may further contain at least one selected from the group consisting of Ni, Cr and Cu other than Fe; Y is at least one selected from the group consisting of Li, Be, B, Na, Mg, Al, K, Ca, Ti and Si; and Z is at least one of F and Cl.Type: ApplicationFiled: July 25, 2011Publication date: May 30, 2013Applicant: NEC ENERGY DEVICES, LTD.Inventors: Makiko Uehara, Takehiro Noguchi