Search Patents
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Publication number: 20010031400Abstract: A nickel hydroxide positive active material for an alkaline battery contains nickel hydroxide powder having a nickel valence of greater than 2; and a cobalt compound having a cobalt valence of greater than 2, which is formed on the surface of said nickel hydroxide powder. For example, the surface of nickel oxyhydroxide powder is covered by cobalt oxyhydroxide layer. This positive active material is used as a starting material to produce an electrode by retaining it in a three-dimensional porous material.Type: ApplicationFiled: May 10, 2001Publication date: October 18, 2001Applicant: JAPAN STORAGE BATTERY CO., LTD.Inventors: Yukitaka Seyama, Hideki Sasaki, Toshio Murata
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Patent number: 4844999Abstract: A nickel electrode for an alkaline battery includes a porous alkali-proof metal fiber substrate as a current collector and an active material principally formed of a nickel hydroxide powder is precluded from formation of the higher oxide, .gamma.-NiOOH, is improved in the ratio of utilization of the active material, and is provided with a high energy density and a long service life when the nickel hydroxide powder employed therein possesses a pore radius in the range of 15 to 30 .ANG., a total pore volume of not more than 0.05 ml/g, and a specific surface area in the range of 15 to 30 m.sup.2 /g. An alkaline battery is also provided by the invention which uses the nickel electrode described above.Type: GrantFiled: May 26, 1988Date of Patent: July 4, 1989Assignee: Yuasa Battery Company LimitedInventors: Masahiko Oshitani, Hiroshi Yufu
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Patent number: 4985318Abstract: A nickel electrode for an alkaline battery comprises a porous alkaline-proof metal fiber substrate used as a current collector, and active material for the electrode. The active material includes nickel hydroxide powder active material, to which zinc or magnesium is added at a rate in a range of 3-10 wt % or 1-3 wt %, respectively. The zinc and magnesium is in a solid solution in crystal of the nickel hydroxide, and the active material forms principle compound of paste, which is loaded in the electrode.Type: GrantFiled: May 30, 1989Date of Patent: January 15, 1991Assignee: Yuasa Battery Co., Ltd.Inventors: Masahiko Oshitani, Keiichi Hasegawa, Hiroshi Yufu
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Patent number: 6924064Abstract: A positive active material for non-aqueous electrolyte secondary battery is provided comprising lithium manganese oxide having such a spinel structure that the half-width (2?) of the reflection peak corresponding to 440 plane as determined by X-ray diffractometry using CuK? ray is not greater than 0.145°. The use of this positive active material makes it possible to obtain a secondary battery which exhibits a good cycle life performance at room temperature and high temperatures and a reduced capacity drop when stored at high temperatures.Type: GrantFiled: November 5, 2001Date of Patent: August 2, 2005Assignee: Japan Storage Battery Co., Ltd.Inventors: Atsuro Kondo, Junichi Toriyama, Masanao Terasaki
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Patent number: 5795558Abstract: A positive electrode active material for a lithium secondary battery is made of LiNi.sub.1-x-y-z Co.sub.x Mn.sub.y Al.sub.z O.sub.2, in which x, y and z satisfy relations of 0.ltoreq.y.ltoreq.0.3, 0.ltoreq.x.ltoreq.0.25, 0.ltoreq.z.ltoreq.0.15.Type: GrantFiled: October 9, 1997Date of Patent: August 18, 1998Assignee: Japan Storage Battery Co., Ltd.Inventors: Takashi Aoki, Mikito Nagata, Hisashi Tsukamoto
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Patent number: 6221529Abstract: A positive electrode for a lithium battery wherein nickel oxyhydroxide is held in an electro-conductive three-dimensional porous material or a sintered nickel substrate and a lithium battery using it. When the three-dimensional porous material is used, the electric contact of the active material and the current collector is good, also the contact state of nickel oxyhydroxide particles, which are active materials, each other is good, further, the contact resistance among the particles is low, and also the diffusion of the lithium ion, which is the rate-determining step of the reaction, becomes easy among the particles.Type: GrantFiled: November 18, 1997Date of Patent: April 24, 2001Assignee: Japan Storage Battery Co., Ltd.Inventor: Hideo Yasuda
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Patent number: 5718989Abstract: A positive electrode active material for a lithium secondary battery is made of LiNi.sub.1-x-y-z Co.sub.x Mn.sub.y Al.sub.z O.sub.2, in which x, y and z satisfy relations of 0.ltoreq.y.ltoreq.0.3, 0.ltoreq.x.ltoreq.0.25, 0<z.ltoreq.0.15.Type: GrantFiled: December 27, 1996Date of Patent: February 17, 1998Assignee: Japan Storage Battery Co., Ltd.Inventors: Takashi Aoki, Mikito Nagata, Hisashi Tsukamoto
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Patent number: 6399246Abstract: A water-soluble binder useful for preparing an electrode for either primary or secondary batteries, having either aqueous or non-aqueous electrolyte, contains polyacrylamide and at least one copolymer selected from carboxylated styrene-butadiene copolymer and styrene-acrylate copolymer. The water-dispersible binder eliminates or reduces the need for organic solvents during preparation of an electrode made of a particulate active electrode material. The binder exhibits good chemical resistance, adhesive properties, flexibility and resilience, making it well suited for use in preparing batteries having a spirally wound electrode assembly.Type: GrantFiled: May 5, 2000Date of Patent: June 4, 2002Assignee: Eveready Battery Company, Inc.Inventors: Mark D. Vandayburg, George E. Blomgren
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Patent number: 7238447Abstract: A high-capacity enclosed nickel-zinc primary battery excellent in characteristics such as capacity maintenance factor, energy density, and high-efficient discharge characteristics, an anode using it, and a production method for them. An enclosed nickel-zinc primary battery which uses as an anode an anode active material of nickel hydroxide compound, such as nickel oxyhydroxide, particles and uses zinc alloy gel as a cathode material, wherein a ratio of anode theoretical capacity to cathode theoretical capacity is 1.0-1.6, and a ratio of alkali electrolyte to anode theoretical capacity is 1.0-1.6 ml/Ah.Type: GrantFiled: November 16, 2001Date of Patent: July 3, 2007Assignee: Toshiba Battery Co., Ltd.Inventors: Kunihiko Miyamoto, Shuichiro Irie, Shinichi Miyamoto, Naomi Hadano, Teiji Okayama
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Patent number: 6399247Abstract: A nickel-metal hydride secondary battery comprising electrode group comprising positive electrode comprised mainly of nickel hydroxide, negative electrode comprised mainly of a hydrogen storage alloy, and separator being disposed between the positive electrode and the negative electrode, wherein the electrode group is sealed in battery casing, together with an alkali electrolyte liquid, wherein, in the battery, a W element and an Na element are present simultaneously. The nickel-metal hydride secondary battery of the present invention is advantageous not only in that it exhibits high utilization of the active material and excellent self-discharge characteristics in a high temperature storage as well as high charging efficiency in a high temperature environment, but also in that it has excellent large current discharge characteristics.Type: GrantFiled: February 25, 2000Date of Patent: June 4, 2002Assignees: Toshiba Battery Co., Ltd., Kabushiki Kaisha ToshibaInventors: Hiroshi Kitayama, Hirotaka Hayashida, Masaaki Yamamoto, Naomi Bando, Kunihiko Miyamoto, Hideharu Suzuki
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Publication number: 20140329145Abstract: An alkaline, rechargeable electrochemical cell includes a pasted electrode structure in which a composition comprising a paste matrix component includes cobalt in an amount greater than 6 weight percent ranging up to 14 weight percent. The matrix may also include a rare earth such as yttrium. The composition further includes particles of nickel hydroxide dispersed in the matrix, and these particles include cobalt levels ranging from greater than 8 atomic percent up to 15 atomic percent. Cells incorporating these materials have good charging efficiency at elevated temperatures.Type: ApplicationFiled: February 6, 2013Publication date: November 6, 2014Applicant: Ovonic Battery Company, Inc.Inventor: Ovonic Battery Company, Inc.
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Publication number: 20020018935Abstract: In accordance with the non-aqueous electrolyte secondary battery of the invention and the process for the preparation thereof, charging is carried out with a combination of a positive electrode provided with excess lithium and a negative electrode in order to cause lithium to be deposited on the negative electrode. Accordingly, no oxidized surface film is interposed between lithium and the current collector of negative electrode or the negative active material layer as in the case where a metallic lithium foil is laminated on the negative electrode. In this arrangement, a battery having a small internal resistance can be provided. Since the deposition of lithium is conducted in the assembled battery, lithium does not come in contact with air, preventing the formation of a thick ununiform oxidized film on the surface thereof. Thus, the deposition of dendrite can be inhibited, making it possible to inhibit the drop of battery capacity and hence provide a battery having an excellent cycle life performance.Type: ApplicationFiled: July 6, 2001Publication date: February 14, 2002Applicant: JAPAN STORAGE BATTERY CO., LTD.Inventor: Mikio Okada
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Patent number: 7851087Abstract: A high-capacity enclosed nickel-zinc primary battery excellent in characteristics such as capacity maintenance factor, energy density, and high-efficient discharge characteristics, an anode using it, and a production method for them. An enclosed nickel-zinc primary battery which uses as an anode an anode active material of nickel hydroxide compound, such as nickel oxyhydroxide, particles and uses zinc alloy gel as a cathode material, wherein a ratio of anode theoretical capacity to cathode theoretical capacity is 1.0-1.6, and a ratio of alkali electrolyte to anode theoretical capacity is 1.0-1.6 ml/Ah.Type: GrantFiled: May 5, 2009Date of Patent: December 14, 2010Assignee: Toshiba Battery Co., Ltd.Inventors: Kunihiko Miyamoto, Shuichiro Irie, Shinichi Miyamoto, Naomi Hadano, Teiji Okayama
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Publication number: 20120015250Abstract: Provided are a positive electrode material for lithium ion batteries and a process for preparing the same. The positive electrode material for lithium ion batteries comprises a composite positive electrode material consists of LiCoO2 and an auxiliary positive electrode material, the general formula of the auxiliary positive electrode material is LiCo1?x?yNixMnyO2, wherein 0<x<0.9, 0<y<0.9, 0<x+y<0.9, and the LiCoO2 is a modified LiCoO2 coated with an Al2O3 film. The overcharge performance of the batteries can be significantly increased and the use amount of the overcharge additive can be reduced by using the positive electrode material so as to its improve the cycle performance of the batteries and improve the anti-overcharge safety in the special applications and the charging conditions.Type: ApplicationFiled: December 22, 2009Publication date: January 19, 2012Applicant: SHENZHEN BAK BATTERY CO., LTD.Inventors: Xin Teng, Wei He, Ming He, Ruyu Rao, Bin Xiao, Qiming Pan
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Patent number: 7594938Abstract: A high-capacity enclosed nickel-zinc primary battery excellent in characteristics such as capacity maintenance factor, energy density, and high-efficient discharge characteristics, an anode using it, and a production method for them. An enclosed nickel-zinc primary battery which uses as an anode an anode active material of nickel hydroxide compound, such as nickel oxyhydroxide, particles and uses zinc alloy gel as a cathode material, wherein a ratio of anode theoretical capacity to cathode theoretical capacity is 1.0-1.6, and a ratio of alkali electrolyte to anode theoretical capacity is 1.0-1.6 ml/Ah.Type: GrantFiled: May 25, 2007Date of Patent: September 29, 2009Assignee: Toshiba Battery Co., Ltd.Inventors: Kunihiko Miyamoto, Shuichiro Irie, Shinichi Miyamoto, Naomi Hadano, Teiji Okayama
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Patent number: 6558842Abstract: A nickel hydroxide positive active material for an alkaline battery contains nickel hydroxide powder having a nickel valence of greater than 2; and a cobalt compound having a cobalt valence of greater than 2, which is formed on the surface of said nickel hydroxide powder. For example, the surface of nickel oxyhydroxide powder is covered by cobalt oxyhydroxide layer. This positive active material is used as a starting material to produce an electrode by retaining it in a three-dimensional porous material.Type: GrantFiled: May 10, 2001Date of Patent: May 6, 2003Assignees: Japan Storage Battery Co., Ltd., GS-Melcotec Co., Ltd.Inventors: Yukitaka Seyama, Hideki Sasaki, Toshio Murata
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Patent number: 6251538Abstract: A nickel hydroxide positive active material for an alkaline battery contains nickel hydroxide powder having a nickel valence of greater than 2; and a cobalt compound having a cobalt valence of greater than 2, which is formed on the surface of said nickel hydroxide powder. For example, the surface of nickel oxyhydroxide powder is covered by cobalt oxyhydroxide layer. This positive active material is used as a starting material to produce an electrode by retaining it in a three-dimensional porous material.Type: GrantFiled: April 28, 1999Date of Patent: June 26, 2001Assignees: Japan Storage Battery Co., Ltd., GS-Melcotec Co., Ltd.Inventors: Yukitaka Seyama, Hideki Sasaki, Toshio Murata
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Patent number: 6800397Abstract: In accordance with the non-aqueous electrolyte secondary battery of the invention and the process for the preparation thereof, charging is carried out with a combination of a positive electrode provided with excess lithium and a negative electrode in order to cause lithium to be deposited on the negative electrode. Accordingly, no oxidized surface film is interposed between lithium and the current collector of negative electrode or the negative active material layer as in the case where a metallic lithium foil is laminated on the negative electrode. In this arrangement, a battery having a small internal resistance can be provided. Since the deposition of lithium is conducted in the assembled battery, lithium does not come in contact with air, preventing the formation of a thick ununiform oxidized film on the surface thereof. Thus, the deposition of dendrite can be inhibited, making it possible to inhibit the drop of battery capacity and hence provide a battery having an excellent cycle life performance.Type: GrantFiled: July 6, 2001Date of Patent: October 5, 2004Assignee: Japan Storage Battery Co., Ltd.Inventor: Mikio Okada
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Patent number: 6268082Abstract: The present invention is to provide a production method of an active material for an alkaline secondary battery comprising: a step of mixing particles comprising particles mainly containing nickel hydroxide and particles of a metal cobalt or a cobalt compound in a mixer with a sealed structure comprising a heating means in the presence of oxygen and an alkaline aqueous solution while heating. An active material produced by the method allows a high utilization. And a battery assembled with a positive electrode using the active material has an excellent high ratio discharge characteristic, and hardly causes the capacity decline even at the time of recharging after leaving in the over discharge state for a long time.Type: GrantFiled: March 12, 1999Date of Patent: July 31, 2001Assignee: Toshiba Battery Co., Ltd.Inventors: Masayoshi Hiruma, Naomi Bando, Kunihiko Miyamoto, Makoto Wakabayashi
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Publication number: 20030140483Abstract: An alkaline secondary battery which is characterized in that it comprises, a positive electrode containing nickel hydroxide having a value of 0.8° or more in the half-width of a peak in the (101) plane thereof as measured by X-ray powder diffraction (2&thgr;) using Cu—K&agr; ray, and 4.0 to 15% by weight of at least one material selected from the group consisting of zinc and zinc compounds, and an alkali electrolyte, the ratio of which to theoretical capacity of the positive electrode being 0.7 to 2.0 cm3/Ah, the weight of the at least one material being one calculated as zinc element and based on the weight of the nickel hydroxide.Type: ApplicationFiled: January 3, 2003Publication date: July 31, 2003Applicant: TOSHIBA BATTERY CO., LTD.Inventors: Makoto Wakabayashi, Kunihiko Miyamoto, Tetsuya Yamane, Naomi Bando, Kiyoshi Ishitsuka, Ken-Ichi Kanno, Hidekazu Oppata