Patents by Inventor Mariko Miyachi
Mariko Miyachi 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: 11670756Abstract: To provide a negative electrode for a secondary battery and a secondary battery having a large energy density and a capacity less likely to reduce even after repeated charging and discharging, and manufacturing methods thereof. The above-described problem is solved by a negative electrode for a secondary battery (3) comprising a negative electrode active material layer (3?) including at least a silicon-based active material and a binder, and a negative electrode current collector (14) having a structural form in which the silicon-based active material has an amorphous region including lithium and island-shaped lithium carbonate is distributed in the amorphous region.Type: GrantFiled: October 31, 2018Date of Patent: June 6, 2023Assignee: THE UNIVERSITY OF TOKYOInventors: Hiroshi Nishihara, Mariko Miyachi, Masaharu Sato
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Publication number: 20200259165Abstract: To provide a negative electrode for a secondary battery and a secondary battery having a large energy density and a capacity less likely to reduce even after repeated charging and discharging, and manufacturing methods thereof The above-described problem is solved by a negative electrode for a secondary battery (3) comprising a negative electrode active material layer (3?) including at least a silicon-based active material and a binder, and a negative electrode current collector (14) having a structural form in which the silicon-based active material has an amorphous region including lithium and island-shaped lithium carbonate is distributed in the amorphous region.Type: ApplicationFiled: October 31, 2018Publication date: August 13, 2020Applicant: THE UNIVERSITY OF TOKYOInventors: Hiroshi NISHIHARA, Mariko MIYACHI, Masaharu SATO
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Patent number: 8377591Abstract: An objective of this invention is to provide an anode material for a secondary battery for forming a secondary battery exhibiting a higher initial charge/discharge efficiency, a higher energy density and excellent cycle properties; an anode for a secondary battery; and a secondary battery therewith. An anode material for a secondary battery according to this invention comprises an Si oxide and at least one noble metal. Furthermore, the anode material for a secondary battery of this invention preferably contains lithium metal. Alternatively, an anode material for a secondary battery of this invention may comprise a lithium silicate and at least one noble metal. An anode comprising the anode material for a secondary battery of this invention comprises an activator layer being film-structure or particulate.Type: GrantFiled: December 24, 2004Date of Patent: February 19, 2013Assignee: NEC CorporationInventors: Mariko Miyachi, Hironori Yamamoto
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Patent number: 8034475Abstract: A secondary battery includes an anode for a secondary battery, a cathode which absorbs and discharges lithium ions, and an electrolyte which is placed between the anode for the secondary battery and the cathode. The anode for the secondary battery includes an anode active material layer which absorbs and discharges lithium ions, the anode active material layer including a first layer including carbon as a chief ingredient, and a second layer including at least one first element having a theoretical capacity greater than a theoretical capacity of graphite, and at least one second element which has a theoretical capacity equal to or less than the theoretical capacity of graphite. The second layer includes particles, and the particles include the first element and the second element.Type: GrantFiled: June 7, 2010Date of Patent: October 11, 2011Assignee: NEC CorporationInventors: Hironori Yamamoto, Yutaka Bannai, Mariko Miyachi, Jiro Iriyama, Hidemasa Kawai, Masato Shirakata
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Publication number: 20100248031Abstract: A secondary battery includes an anode for a secondary battery, a cathode which absorbs and discharges lithium ions, and an electrolyte which is placed between the anode for the secondary battery and the cathode. The anode for the secondary battery includes an anode active material layer which absorbs and discharges lithium ions, the anode active material layer including a first layer including carbon as a chief ingredient, and a second layer including at least one first element having a theoretical capacity greater than a theoretical capacity of graphite, and at least one second element which has a theoretical capacity equal to or less than the theoretical capacity of graphite. The second layer includes particles, and the particles include the first element and the second element.Type: ApplicationFiled: June 7, 2010Publication date: September 30, 2010Applicant: NEC CorporationInventors: Hironori Yamamoto, Yutaka Bannai, Mariko Miyachi, Jiro Iriyama, Hidemasa Kawai, Masato Shirakata
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Patent number: 7763387Abstract: Since a first layer (a carbon layer 2a) whose chief ingredient is carbon and a second layer (Li absorbing layer 3a) containing particles having a theoretical capacity greater than that of graphite are formed on anode collector 1a, high capacity and high operation voltage can be realized. Since a element having a theoretical capacity equal to or less than that of graphite is added to the particles constituting this second layer, expansion and contraction of volume according to the charge and discharge are suppressed. This enables capacity deterioration to be suppressed even though cycles go on.Type: GrantFiled: May 22, 2003Date of Patent: July 27, 2010Assignee: NEC CorporationInventors: Hironori Yamamoto, Yutaka Bannai, Mariko Miyachi, Jiro Iriyama, Hidemasa Kawai, Masato Shirakata
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Patent number: 7462244Abstract: A vacuum deposition apparatus is used for deposit evaporated substance from evaporation sources (6a and 6b) on the desired position of a flexible substrate (1). While the flexible substrate (1) is carried using rollers in a vacuum, shutters (8a and 8b) are opened and closed to control the movement of the evaporated substance via openings. A film having a desired shape of pattern is formed on the flexible substrate (1) with higher controllability.Type: GrantFiled: November 21, 2002Date of Patent: December 9, 2008Assignee: NEC CorporationInventors: Koji Utsugi, Hironori Yamamoto, Mariko Miyachi, Tamaki Miura, Mitsuhiro Mori, Yutaka Bannai, Ikiko Yamazaki
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Patent number: 7285359Abstract: An object of the present invention is to provide a negative electrode for a secondary battery which has large capacity and restrains a rise in resistance inside the battery and reduction in capacity even after cycles and the secondary battery using the same. A first active material layer 2a comprising members occluding and releasing Li onto a collector 1a is formed and a second active material layer 3a as an alloy layer containing metal forming alloy with lithium or lithium and metal not-forming alloy with lithium is formed thereon. The secondary battery is constituted using the negative electrode.Type: GrantFiled: January 22, 2003Date of Patent: October 23, 2007Assignee: NEC CorporationInventors: Hironori Yamamoto, Mitsuhiro Mori, Jiro Iriyama, Mariko Miyachi, Koji Utsugi, Yutaka Bannai, Tamaki Miura, Ikiko Yamazaki
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Publication number: 20070122700Abstract: An objective of this invention is to provide an anode material for a secondary battery for forming a secondary battery exhibiting a higher initial charge/discharge efficiency, a higher energy density and excellent cycle properties; an anode for a secondary battery; and a secondary battery therewith. An anode material for a secondary battery according to this invention comprises an Si oxide and at least one noble metal. Furthermore, the anode material for a secondary battery of this invention preferably contains lithium metal. Alternatively, an anode material for a secondary battery of this invention may comprise a lithium silicate and at least one noble metal. An anode comprising the anode material for a secondary battery of this invention comprises an activator layer being film-structure or particulate.Type: ApplicationFiled: December 24, 2004Publication date: May 31, 2007Inventors: Mariko Miyachi, Hironori Yamamoto
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Patent number: 7118831Abstract: An anode with a multi-layer structure including a first layer (21) having carbon as a main component, and a second layer (22) having lithium-ion conductivity and including a material as a main component thereof which can insert and extract lithium ions, or a multi-layer structure including a third layer (23) containing lithium in addition to the first layer and the second layer, and a lithium secondary battery including the same. The lithium secondary battery can be provided in which the battery capacity is substantially enhanced in the voltage range where the battery is actually used while maintaining the higher charge-discharge efficiency and the excellent cycle performance.Type: GrantFiled: April 9, 2003Date of Patent: October 10, 2006Assignee: NEC CorporationInventors: Yutaka Bannai, Hironori Yamamoto, Mariko Miyachi, Ikiko Yamazaki, Koji Utsugi, Jiro Iriyama, Tamaki Miura, Mitsuhiro Mori, Hidemasa Kawai
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Publication number: 20050147888Abstract: An object of the present invention is to provide a negative electrode for a secondary battery which has large capacity and restrains a rise in resistance inside the battery and reduction in capacity even after cycles and the secondary battery using the same. A first active material layer 2a comprising members occluding and releasing Li onto a collector 1a is formed and a second active material layer 3a as an alloy layer containing metal forming alloy with lithium or lithium and metal not-forming alloy with lithium is formed thereon. The secondary battery is constituted using the negative electrode.Type: ApplicationFiled: January 22, 2003Publication date: July 7, 2005Inventors: Hironori Yamamoto, Mitsuhiro Mori, Jiro Iriyama, Mariko Miyachi, Koji Utsugi, Yutaka Bannai, Tamaki Miura, Ikiko Yamazaki
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Publication number: 20050089757Abstract: An anode with a multi-layer structure including a first layer (21) having carbon as a main component, and a second layer (22) having lithium-ion conductivity and including a material as a main component thereof which can insert and extract lithium ions, or a multi-layer structure including a third layer (23) containing lithium in addition to the first layer and the second layer, and a lithium secondary battery including the same. The lithium secondary battery can be provided in which the battery capacity is substantially enhanced in the voltage range where the battery is actually used while maintaining the higher charge-discharge efficiency and the excellent cycle performance.Type: ApplicationFiled: April 9, 2003Publication date: April 28, 2005Inventors: Yutaka Bannai, Hironori Yamamoto, Mariko Miyachi, Ikiko Yamazaki, Koji Utsugi, Jiro Iriyama, Tamaki Miura, Mitsuhiro Mori, Hidemasa Kawai
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Publication number: 20050084758Abstract: Since a first layer (a carbon layer 2a) whose chief ingredient is carbon and a second layer (Li absorbing layer 3a) containing particles having a theoretical capacity greater than that of graphite are formed on anode collector 1a, high capacity and high operation voltage can be realized. Since a element having a theoretical capacity equal to or less than that of graphite is added to the particles constituting this second layer, expansion and contraction of volume according to the charge and discharge are suppressed. This enables capacity deterioration to be suppressed even though cycles go on.Type: ApplicationFiled: May 22, 2003Publication date: April 21, 2005Inventors: Hironori Yamamoto, Yutaka Bannai, Mariko Miyachi, Jiro Iriyama, Hidemasa Kawai, Masato Shirakata
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Publication number: 20050084759Abstract: A lithium ion secondary battery provided with both high weight energy density and good cycle characteristics (capacity retaining ratio during an extended use). A secondary battery comprising a negative electrode having, as a negative electrode active material, carbon and a lithium absorbing material that forms an alloy with lithium, the above active material having a layer structure, a positive electrode capable of absorbing and desorbing lithium ions, and an electrolyte disposed between the positive and negative electrodes, wherein the Li content in the lithium absorbing material layer in the negative electrode is between 31 and 67% at a discharge depth of 100%.Type: ApplicationFiled: December 26, 2002Publication date: April 21, 2005Inventors: Mariko Miyachi, Jiro Iriyama, Ikiko Yamazaki, Hironori Yamamoto, Koji Utsugi, Tamaki Miura, Mitsuhiro Mori, Yutaka Bannai
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Publication number: 20050008778Abstract: A vacuum deposition apparatus is used for deposit evaporated substance from evaporation sources (6a and 6b) on the desired position of a flexible substrate (1). While the flexible substrate (1) is carried using rollers in a vacuum, shutters (8a and 8b) are opened and closed to control the movement of the evaporated substance via openings. A film having a desired shape of pattern is formed on the flexible substrate (1) with higher controllability.Type: ApplicationFiled: November 21, 2002Publication date: January 13, 2005Inventors: Koji Utsugi, Hironori Yamamoto, Mariko Miyachi, Tamaki Miura, Mitsuhiro Mori, Yutaka Bannai, Ikiko Yamazaki
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Publication number: 20040258997Abstract: A multilayer negative electrode having a carbon layer as a first layer, realizing high battery capacity in the range of voltages at which a battery is actually used while maintaining high charge/discharge efficiency and good cycle characteristics by a simple method. A first layer (2a) the major component of which is carbon and a second layer (3a) the major component of which is filmy material having lithium ion conductivity are stacked on copper foil (1a). The second layer (3a) is formed by dispersing at least one kind of metal particles, alloy particles, and metal oxide particles in a solution in which a binder is dissolved and applying and drying the coating solution.Type: ApplicationFiled: April 23, 2004Publication date: December 23, 2004Inventors: Koji Utsugi, Hironori Yamamoto, Jiro Iriyama, Mitsuhiro Mori, Tamaki Miura, Yutaka Bannai, Mariko Miyachi, Ikiko Yamazaki
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Patent number: 6777134Abstract: A negative electrode for a rechargeable battery including: a current collector, a first layer containing a conductive material to occlude and release lithium ion, the first layer formed on the current collector, a second layer containing a metal selected from lithium and lithium alloy, the second layer formed on the first layer, and a third layer containing a lithium ion conductive material, the third layer formed on the second layer. The third layer prevents the lithium and/or the lithium alloy in the second layer from being in contact with the electrolyte and smoothly feeds the lithium to the second layer to improve the efficiency of the negative electrode. The first layer can occlude and release the part of the lithium to be occluded and released, thereby reducing the volume change of the second layer. Such a structure of the negative electrode enables us to enhance cycling efficiency, and to attain long cycle life and good safety.Type: GrantFiled: July 31, 2002Date of Patent: August 17, 2004Assignee: NEC CorporationInventors: Mitsuhiro Mori, Hironori Yamamoto, Koji Utsugi, Jiro Iriyama, Tamaki Miura, Mariko Miyachi
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Publication number: 20030129497Abstract: An anode for use in a non-aqueous-electrolyte secondary battery includes an active material film for occluding and releasing lithium ions, and an amorphous carbon film or a diamond-like carbon film covering the active material film for suppressing growth of dendrite and degradation of the anode, thereby achieving improved cycle lifetime of the secondary battery.Type: ApplicationFiled: September 3, 2002Publication date: July 10, 2003Applicant: NEC CORPORATIONInventors: Hironori Yamamoto, Mitsuhiro Mori, Jiro Iriyama, Kouji Utsugi, Tamaki Miura, Yutaka Bannai, Mariko Miyachi
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Publication number: 20030036000Abstract: A negative electrode for a rechargeable battery including: a current collector, a first layer containing a conductive material to occlude and release lithium ion, the first layer formed on the current collector, a second layer containing a metal selected from lithium and lithium alloy, the second layer formed on the first layer, and a third layer containing a lithium ion. conductive material, the third layer formed on the second layer. The third layer prevents the lithium and/or the lithium alloy in the second layer from being in contact with the electrolyte and smoothly feeds the lithium to the second layer to improve the efficiency of the negative electrode. The first layer can occlude and release the part of the lithium to be occluded and released, thereby reducing the volume change of the second layer. Such a structure of the negative electrode enables us to enhance cycling efficiency, and to attain long cycle life and good safety.Type: ApplicationFiled: July 31, 2002Publication date: February 20, 2003Applicant: NEC CorporationInventors: Mitsuhiro Mori, Hironori Yamamoto, Koji Utsugi, Jiro Iriyama, Tamaki Miura, Mariko Miyachi