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公开(公告)号：CA2998724A1
公开(公告)日：2017-03-23
申请号：CA2998724
申请日：2016-09-09
Applicant: TORAY INDUSTRIES
Inventor： MANABE KOICHIRO , TAMAKI EIICHIRO , KAWASAKI MANABU
Abstract: The purpose of the present invention is to provide graphene in a form that renders the graphene highly dispersible and enables the graphene to retain high electroconductivity and ionic conductivity when used as a raw material for producing electrode materials. The present invention is a graphene dispersion which includes graphene dispersed in a solvent including 50 mass% or more N-methylpyrrolidone. When this graphene dispersion is diluted with N-methylpyrrolidone to a graphene content by weight of 0.000013, the dilution has a weight absorptivity coefficient, as measured at a wavelength of 270 nm and calculated using the following equation (1), of 25,000-200,000 cm-1. Weight absorptivity coefficient (cm-1) = absorbance/{0.000013×(optical path length (cm) of cell)} (1)
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公开(公告)号：CA2872650A1
公开(公告)日：2014-01-09
申请号：CA2872650
申请日：2013-06-28
Applicant: TORAY INDUSTRIES
Inventor： YAMASHITA TETSUO , CHAYAMA NATSUKO , YUBA TOMOYUKI , TAMAKI EIICHIRO , KUBOTA YASUO , NONAKA TOSHIYUKI
Abstract: [Problem] To Provide a negative electrode material for lithium ion secondary batteries, a composite negative electrode material for lithium ion secondary batteries, a resin composition for negative electrodes of lithium ion secondary batteries and a negative electrode for lithium ion secondary batteries, each of which is capable of ensuring high charge/discharge capacity, excellent initial charge/discharge characteristics and excellent capacity retention rate. [Solution] A high charge/discharge capacity, excellent capacity retention rate and high initial efficiency can be achieved by using a negative electrode material, wherein the surfaces of core particles that are formed of silicon and have an average particle diameter of from 5 nm to 100 nm (inclusive) are covered with coating layers that do not substantially contain silicon oxide, or by using a composite negative electrode material for lithium ion secondary batteries, which contains the negative electrode material and a matrix material, while using, as a binder resin, a polyimide resin or a precursor thereof.
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3.发明专利
公开(公告)号：CA2962721C
公开(公告)日：2020-07-14
申请号：CA2962721
申请日：2015-10-06
Applicant: TORAY INDUSTRIES
Inventor： YANG HANXIAO , TAMAKI EIICHIRO , KUBOTA YASUO
IPC: C01B32/182 , H01M4/13 , H01M4/139 , H01M4/62
Abstract: The present invention relates to preparation of a highly dispersible graphene powder. Further, an object of the present invention is to provide an electrode for a lithium ion battery having good output characteristics and cycle characteristics by utilizing a highly dispersible graphene powder. The present invention provides a graphene powder having a specific surface area of 80 m2/g or more to 250 m2/g or less as measured by BET measurement, and an oxygen-to-carbon element ratio of 0.09 or more to 0.30 or less as measured by X-ray photoelectron spectroscopy.
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公开(公告)号：CA2872445C
公开(公告)日：2020-04-07
申请号：CA2872445
申请日：2013-05-23
Applicant: TORAY INDUSTRIES
Inventor： SUN PEIYU , LIU GANGQIAO , WU ZHENQI , WU GANG , TAMAKI EIICHIRO , KUBOTA YASUO
IPC: C01B32/182 , C01B32/184 , C09C3/08 , H01M4/133
Abstract: In order to prepare a highly conductive and highly dispersible graphene powder and to obtain an electrode for a lithium ion battery with excellent performance utilizing the highly conductive and highly dispersible graphene, a graphene powder and a preparation method thereof is provided. The graphene powder comprises a compound having a catechol group adsorbing on the surface of graphene in a weight ratio of 5-50% relative to the grapheme and the element ratio of oxygen to carbon in the graphene powder measured by X-ray photoelectron spectroscopy is 0.06 or more and 0.20 or less. The method for producing a graphene powder comprise the step of reducing a graphite oxide with a reducing agent having no catechol group in the presence of a compound having a catechol group.
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公开(公告)号：CA2819316A1
公开(公告)日：2012-06-14
申请号：CA2819316
申请日：2011-12-09
Applicant: TORAY INDUSTRIES
Inventor： SUN PEIYU , WU ZHENQI , LIU GANGQIAO , TAMAKI EIICHIRO , KUBOTA YASUO , WU GANG
Abstract: Provided are a graphene powder, a production method thereof, and an electrochemical device comprising the same. The graphene powder has an elemental ratio of oxygen atoms to carbon atoms of not less than 0.07 and not more than 0.13 and an elemental ratio of nitrogen atoms to carbon atoms of not more than 0.01. In the production method, the graphene powder is produced by using a dithionous acid salt as a reducing agent. Since the graphene has a low content of nitrogen atoms and a proper amount of oxygen atoms and a proper defect, the graphene is provided with good performance of both dispersibility and conductive property, and is usable as a good conductive additive, such as the one for a lithium ion battery electrode. The production method has the advantages of low cost, high efficiency and low toxicity.
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Patent Agency Ranking
公开(公告)号：ES2642192T3
公开(公告)日：2017-11-15
申请号：ES13801439
申请日：2013-05-23
Applicant: TORAY INDUSTRIES
Inventor： SUN PEIYU , LIU GANGQIAO , WU ZHENQI , WU GANG , TAMAKI EIICHIRO , KUBOTA YASUO
IPC: C01B32/192 , C01B32/194 , H01M4/62
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公开(公告)号：CA2977349A1
公开(公告)日：2016-10-06
申请号：CA2977349
申请日：2016-03-22
Applicant: TORAY INDUSTRIES
Inventor： TSUJI HIRONOBU , KUBOTA YASUO , KAWAMURA HIROAKI , TAMAKI EIICHIRO , TABAYASHI MIYUKI
Abstract: Through the present invention, high capacity is realized when lithium manganese phosphate is used as the active material of a lithium ion secondary cell. The present invention is lithium manganese phosphate nanoparticles characterized in that the ratio I20/I29 of the peak intensity at 20° and the peak intensity at 29° thereof obtained by X-ray diffraction is 0.88 to 1.05, and the crystal size thereof obtained by X-ray diffraction is 10 nm to 50 nm.
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8.发明专利
公开(公告)号：CA2962721A1
公开(公告)日：2016-04-14
申请号：CA2962721
申请日：2015-10-06
Applicant: TORAY INDUSTRIES
Inventor： YANG HANXIAO , TAMAKI EIICHIRO , KUBOTA YASUO
IPC: C01B32/182 , H01M4/13 , H01M4/139 , H01M4/62
Abstract: The present invention relates to the manufacturing of a highly dispersible graphene powder. Additionally, the present invention addresses the problem of using a highly dispersible graphene powder to obtain an electrode for lithium ion batteries having good output characteristics · cycle characteristics. The present invention provides a graphene powder having a specific surface area of 80 m2/g to 250 m2/g, as measured by BET measurement, and an oxygen-to-carbon element ratio of 0.09 to 0.30, as measured by X-ray photoelectron spectroscopy.
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公开(公告)号：CA2893574A1
公开(公告)日：2014-07-31
申请号：CA2893574
申请日：2014-01-20
Applicant: TORAY INDUSTRIES
Inventor： KAWAMURA HIROAKI , KUBOTA YASUO , TAMAKI EIICHIRO , MATSUSHITA MIYUKI , YANG HANXIAO
Abstract: [Problem] To provide: positive electrode active material/graphene composite particles, which are for a positive electrode active material of a lithium ion battery having low electron conductivity, and with which electron conductivity is improved while suppressing hindrance of lithium ion deintercalation into active material particles; and a positive electrode material for a lithium ion battery, said positive electrode material comprising said composite particles. [Solution] The present invention provides: positive electrode active material/graphene composite particles; and a composite particle-like positive electrode material which is used in a lithium ion battery, and which is obtained by combining, with a matrix including graphene, positive electrode active material particles, said positive electrode material wherein, a value obtained by dividing the proportion of carbon (%) in a material surface measured by way of an X-ray photoelectron measurement, by the proportion of carbon (%) in the whole material, is in the range 1.5 to 7 inclusive.
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公开(公告)号：CA2894517C
公开(公告)日：2021-10-19
申请号：CA2894517
申请日：2014-01-20
Applicant: TORAY INDUSTRIES
Inventor： TAMAKI EIICHIRO , KUBOTA YASUO , KAWAMURA HIROAKI , YANG HANXIAO , HARA MAYUMI
Abstract: [Problem] A conventional positive electrode material for lithium ion cells that is made of positive electrode active material/graphene composite particles has low graphene material ion conductivity and is incapable of providing favorable cell performance. [Solution] In the present invention, positive electrode active material/graphene composite particles are conferred with high electron conductivity and ion conductivity by formation of an appropriately functionalized graphene/positive electrode active material composite, and are capable of yielding a high-capacity/high-output lithium ion secondary cell when used as a positive electrode active material for a lithium ion cell.
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