WO2004067450A1 - 水和ナトリウムコバルト酸化物 - Google Patents
水和ナトリウムコバルト酸化物 Download PDFInfo
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- WO2004067450A1 WO2004067450A1 PCT/JP2004/000511 JP2004000511W WO2004067450A1 WO 2004067450 A1 WO2004067450 A1 WO 2004067450A1 JP 2004000511 W JP2004000511 W JP 2004000511W WO 2004067450 A1 WO2004067450 A1 WO 2004067450A1
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- Prior art keywords
- sodium
- cobalt oxide
- layers
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- hydrated sodium
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G51/00—Compounds of cobalt
- C01G51/40—Cobaltates
- C01G51/42—Cobaltates containing alkali metals, e.g. LiCoO2
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N60/00—Superconducting devices
- H10N60/80—Constructional details
- H10N60/85—Superconducting active materials
- H10N60/855—Ceramic materials
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2002/00—Crystal-structural characteristics
- C01P2002/20—Two-dimensional structures
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2002/00—Crystal-structural characteristics
- C01P2002/30—Three-dimensional structures
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2002/00—Crystal-structural characteristics
- C01P2002/70—Crystal-structural characteristics defined by measured X-ray, neutron or electron diffraction data
- C01P2002/72—Crystal-structural characteristics defined by measured X-ray, neutron or electron diffraction data by d-values or two theta-values, e.g. as X-ray diagram
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2002/00—Crystal-structural characteristics
- C01P2002/70—Crystal-structural characteristics defined by measured X-ray, neutron or electron diffraction data
- C01P2002/76—Crystal-structural characteristics defined by measured X-ray, neutron or electron diffraction data by a space-group or by other symmetry indications
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2002/00—Crystal-structural characteristics
- C01P2002/70—Crystal-structural characteristics defined by measured X-ray, neutron or electron diffraction data
- C01P2002/77—Crystal-structural characteristics defined by measured X-ray, neutron or electron diffraction data by unit-cell parameters, atom positions or structure diagrams
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2002/00—Crystal-structural characteristics
- C01P2002/70—Crystal-structural characteristics defined by measured X-ray, neutron or electron diffraction data
- C01P2002/78—Crystal-structural characteristics defined by measured X-ray, neutron or electron diffraction data by stacking-plane distances or stacking sequences
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/30—Particle morphology extending in three dimensions
- C01P2004/41—Particle morphology extending in three dimensions octahedron-like
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/40—Electric properties
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/42—Magnetic properties
Definitions
- the present invention relates to a hydrated sodium cobalt oxide exhibiting superconductivity.
- a CoOs octahedron in which six oxygen atoms are coordinated with cobalt atoms forms a Co0 2 layer formed by edge-sharing.
- Types rhombohedral, types (monoclinic), types (rhombic), and ⁇ -type (hexagonal) have been found (Non-Patent Document 1). These crystal structures have a structure in which each layer is laminated in the order of Kovarto oxygen sodium-oxygen-cobalt, and the distance between the cobalt layers is 5.19 ⁇ , 5.38 ⁇ , 5.5lA, 5.44 ⁇ , respectively. Is reported.
- Non-Patent Document 4 Since its Desa see large thermoelectric power at 1997 NaCo204 single crystal (Non-Patent Document 4), application as thermoelectric materials have been expected, (Na, Ca) Co 2 04 (non-patent Document 5), reports on NaCo2-xCux0 4 (non-patent Document 6) have been made.
- Lithium cobalt oxide represented by LiCo02
- LiCo02 Lithium cobalt oxide
- This oxide also has the same Co02 layer as the sodium cobalt oxide described above.
- sodium cobaltate I arsenide material as a precursor, if the sodium ions CO0 2 layers was replaced with lithium ions is different for stacking way layer from the lithium cobalt oxide obtained by a conventional solid phase reaction method Lithium cobalt oxide can be obtained (Non-Patent Document 7), and it has been shown that such a lithium cobalt oxide can also be used as a positive electrode material of a lithium ion battery (Non-Patent Document 8).
- Non-Patent Document 1 C. Fouassier, G. Mate jka, J. ⁇ M. Reau, and P. Hagenrauller, J. Solid
- Non-Patent Document 2 J.-J. Braconnier, C. Delmas, C. Fouassier, and P. Hagenrauller, Mat. Res. Bull., 15, pp. 1797-1804 (1980)
- Non-Patent Document 3 S. Kikkawa, S. Miyazaki, and M. Koizumi, J. Sol id State Chem., 62, pp. 35-39 (1986)
- Non-Patent Document 4 I. Terasaki, Y. Sasago, and K. Uchinokura, Phys. Rev. B 56, pp. R12 685-R12687 (1997) Non-patent document 5 Y. An do, N. Miyamoto, K. Segawa, T. Kawata, and I. Terasaki, Phys. Rev. B 60, pp. 10580-10583 (1999)
- Non-patent document 6 I. Terasaki, Y. Ishii, D. Tanaka, K. Takahara, and Y. Iguchi, Jpn. J. Appl. Phys. 40, pp. L65-L67 (2001)
- the cobalt interlayer is extremely wide at 9.5 A to 10.5 A, and exhibits superconductivity at low temperatures as a characteristic.
- the purpose is to provide sodium cobalt oxide.
- FIG. 1 is a schematic diagram showing a crystal structure model of parent compound Nao. 7Co02 and hydrated sodium cobalt oxide in Example 1 of the present invention.
- FIG. 2 is a graph showing a powder X-ray diffraction pattern and a Rietveld analysis result of the hydrated sodium cobalt oxide in Example 1 of the present invention.
- FIG. 3 is a graph showing the results of measuring the electrical resistance of hydrated sodium cobalt oxide in Example 1 of the present invention.
- FIG. 4 is a graph showing the magnetic susceptibility measurement results of hydrated sodium cobalt oxide in Example 1 of the present invention.
- FIG. 5 is a graph showing a powder X-ray diffraction pattern and a Rietveld analysis result of the product obtained in Comparative Example 1 of the present invention.
- FIG. 6 is a graph showing the magnetic susceptibility measurement results of the product (Hata) obtained in Comparative Example 1 of the present invention and the hydrated sodium cobalt oxide ( ⁇ ) obtained in Example 1.
- FIG. 7 is a graph showing a powder X-ray diffraction pattern of the product obtained in Comparative Example 2 of the present invention.
- FIG. 8 is a graph showing the magnetic susceptibility measurement results of the product (reference) obtained in Comparative Example 2 of the present invention and the hydrated sodium cobalt oxide ( ⁇ ) obtained in Example.
- the hydrated sodium cobalt oxide in the present invention is the parent compound NaxC. 02 whether we CO0 2 layers of Natoriumuion partially desorbed, it is then obtained by inserting a water molecule to CO02 layers.
- the hydrated sodium cobalt oxide thus obtained has one sodium ion layer and two water molecule layers between the Co 02 layers shown in Fig. 1, and the covanolate layer extends to about 9.8 ⁇ . In addition, it has a structure that has not been known so far.
- the distance between the Co02 layers is long, and the Co02 layers are laminated via a layer made of electronically insulating sodium ions and water molecules.
- the interaction between the layers is extremely small.
- the conduction electrons in Co02 layer is Me write closed very limited two-dimensional space in the layer becomes very strong interaction between electrons in CO0 2-layer within, to exhibit superconductivity It is thought that it becomes.
- the parent compound Na x Co O 2 can be synthesized by a known method in which a sodium source and a cobalt source are mixed and heated in an oxygen-containing atmosphere.
- Known methods a method using sodium peroxide oxidation (Na 2 0 2) and cobalt oxide (C O3 04) (Preparation Example 1; non Laid Reference 1), a method using sodium oxide (NasO) and cobalt oxide (CosO 4 ) (A. Stoklosa, J. Molenda, and D. Than, Sol id State Ionics, 15, pp.
- the preferred sodium composition (X) region in the parent compound Na x Co 02 is 0.5 ⁇ x ⁇ l.0.
- the sodium composition is smaller than this composition range, cobalt oxide tends to remain, and when the sodium composition is larger than this composition range, Na4Co04 tends to be mixed as an impurity.
- the Na x Co 02 thus obtained exhibits, for example, various crystal structures disclosed in Non-Patent Document 1, but basically has a CoO 2 layer formed by the Co06 octahedron sharing edges. It has one sodium ion layer between the Co02 layers, and the cobalt interlayer distance is 5A to 6A.
- the elimination of sodium ions from the parent compound is achieved by a chemical method using an oxidizing agent such as iodine or bromine (S. Miyazaki, S. Kikkawa, and M. Koizumi, Synthetic Met. 6, pp. 211-217 (1983) )), A method by electrochemical oxidation (JJ Braconnier, C. Delmas, Fouassier, and P. Hagenmuller, Mat. Res. Bull., 15, pp. 1797-1804 (1980)) These methods can be used.
- an oxidizing agent such as iodine or bromine
- iodine or bromine S. Miyazaki, S. Kikkawa, and M. Koizumi, Synthetic Met. 6, pp. 211-217 (1983)
- electrochemical oxidation JJ Braconnier, C. Delmas, Fouassier, and P. Hagenmuller, Mat. Res. Bull., 15, pp. 1797-1804 (1980)
- the simplest method of introducing water molecules is to immerse the compound in which sodium ions have been partially eliminated in water, but it is also possible to use a method of exposing the compound to a humid atmosphere.
- Eiwa cobalt oxide obtained by the above method has a Co02 layer formed by sharing the same octahedron of CoOs as the parent compound, and two CoO2 layers are formed between the CoO2 layers.
- the number of water molecules inserted between layers varies with humidity.
- water molecules when hydrated sodium cobaltate is exposed to a high-humidity atmosphere, water molecules are inserted, and when exposed to a low-humidity atmosphere, water molecules are desorbed.
- There are two sites occupied by water molecules per Co atom (actually, water molecules diffuse between layers, so in the structural analysis described later, six sites per Co atom shown in Table 1) They were distributed to existing sites.) Therefore, the number of water molecules intercalated between the layers is Ru 2 Kodea at maximum per NaxC O 02.
- the water molecules cannot take a two-layer structure and occupy empty sites in the sodium layer.
- the number of water molecules in the hydrated sodium cobalt oxide of the present invention is from 1 to 2 molecules per Col atom.
- this is represented by the general formula Na x Co0 2 yH20, ⁇ ⁇ ⁇ . 4, 1. o ⁇ y 2. o
- a hydrated sodium cobalt oxide represented by 02 ⁇ y 0 was synthesized.
- the content of sodium and cobalt was measured by inductively coupled plasma atomic emission spectrometry (IC P-AES) to determine the composition of the hydrated sodium cobalt oxide thus obtained.
- IC P-AES inductively coupled plasma atomic emission spectrometry
- the superconducting properties of the hydrated sodium copartite oxide obtained in this manner were determined by measuring the resistivity using the four-terminal method, and using SQUID (Superconducting Quantum e Device) to confirm the susceptibility.
- Figure 3 shows the results of resistivity measurement in a zero magnetic field. At about 5K, the resistivity showed a sudden change and dropped.
- the susceptibility was measured in the range of 2K to room temperature under zero magnetic field cooling conditions, and the measured magnetic field was 200e.
- Fig. 4 shows the results.
- the susceptibility decreased from 5K, and the value at 2K was -0.41 emu / mol. This value is the theoretical value of the complete diamagnetism (- 1/4 N ⁇ emu m 3) corresponds to I 3% of together with the results of the resistivity measurement, the substance that shows superconductivity Balta all right.
- sodium cobalt oxide having no water molecules inserted was synthesized and its superconducting properties were examined.
- the synthesis of the parent compound Nao.7Co02 and the partial elimination of sodium were performed in the same manner as in Example 1. Excess bromine and acetonitrile used as a bromine solvent were removed by evaporation under reduced pressure.
- FIG. 5 shows an X-ray powder diffraction pattern of the thus obtained compound.
- + measured value
- solid line calculated value
- vertical bar (top) position of Bragg reflection corresponding to sodium bromide
- vertical bar (bottom) Bragg reflection corresponding to sodium cobalt oxide
- Lower solid line difference between measured and calculated values.
- the resulting material, sodium ⁇ beam cobalt oxide having substantially the same crystal structure as the parent structure (space group:.. P6 3 / ⁇ c , a 2 8141 (4)
- A, c ll 1532 (13)
- the mixture was found to be a mixture of A and sodium bromide.
- FIG. 6 The susceptibility of this mixture measured by SQUID is shown in FIG.
- the vertical axis in FIG. 6 indicates the magnetic susceptibility per mole of Co atom present in the mixture.
- no decrease in susceptibility was observed in the temperature range up to 2 K, It was found that the conduction phase did not appear.
- FIG. 7 shows the powder X-ray diffraction pattern of the substance thus obtained.
- the diffraction peaks appearing can be indexed using a hexagonal unit cell, similarly to the parent compound Nao.7Co02 or the hydrated sodium cobalt oxide obtained in Example 1.
- CO0 2 interlayer distance is about 7A, was suggested to be a structure having a water molecules layer of one layer of Co02 layers.
- the susceptibility of this mixture measured by SQUID is shown in FIG. In FIG. 8, the ordinate indicates the susceptibility per mole of Co atom present in the mixture. In this mixture, the susceptibility decreased from around 5K, but did not become negative in the temperature range up to 2K. This decrease in magnetic susceptibility coincides with the temperature at which the hydrated sodium cobalt oxide obtained in Example 1 transitions to the superconducting phase, and thus the remaining hydrated sodium cobalt oxide obtained in Example 1 is It is considered to indicate.
- the residual amount was calculated from the decrease in susceptibility (1 X 10-1 ⁇ 2mu / mol) observed in this comparative example and the decrease (4X 10-i e mu / mol) observed in Example 1. The amount was as small as 0.25%, so no remaining phases were found in the powder X-ray diffraction. It is considered.
- the hydrated sodium cobalt oxide of the present invention has an extremely wide interlayer distance extending to about 9.8 A, and furthermore, sodium ions and water molecules between the layers are rich in diffusivity. It is capable of ion exchange with species and molecules, and is useful as a precursor for material synthesis by ion exchange. Furthermore, this hydrated sodium cobaltate is the first substance to exhibit superconductivity as a cobalt oxide, and the synthesis of various compounds using this substance as a precursor has been a key to the search for new superconductors. They are also very useful.
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Abstract
Description
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Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE602004008040T DE602004008040T2 (de) | 2003-01-27 | 2004-01-21 | Natrium-kobaltoxid-hydrat |
EP04703937A EP1595848B1 (en) | 2003-01-27 | 2004-01-21 | Sodium cobalt oxide hydrate |
US10/543,089 US20060257311A1 (en) | 2003-01-27 | 2004-01-21 | Sodium cobalt oxide hydrate |
Applications Claiming Priority (2)
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JP2003017070A JP4041883B2 (ja) | 2003-01-27 | 2003-01-27 | 水和ナトリウムコバルト酸化物とその製造方法 |
JP2003-017070 | 2003-01-27 |
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WO2004067450A1 true WO2004067450A1 (ja) | 2004-08-12 |
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PCT/JP2004/000511 WO2004067450A1 (ja) | 2003-01-27 | 2004-01-21 | 水和ナトリウムコバルト酸化物 |
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US (1) | US20060257311A1 (ja) |
EP (1) | EP1595848B1 (ja) |
JP (1) | JP4041883B2 (ja) |
DE (1) | DE602004008040T2 (ja) |
WO (1) | WO2004067450A1 (ja) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
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WO2009001557A1 (ja) * | 2007-06-25 | 2008-12-31 | Sanyo Electric Co., Ltd. | 非水電解質二次電池および正極の製造方法 |
JP4823275B2 (ja) | 2007-06-25 | 2011-11-24 | 三洋電機株式会社 | 非水電解質二次電池 |
WO2009104611A1 (ja) | 2008-02-18 | 2009-08-27 | 独立行政法人科学技術振興機構 | 超伝導化合物及びその製造方法 |
JP5518295B2 (ja) * | 2008-03-27 | 2014-06-11 | 独立行政法人科学技術振興機構 | 層状化合物からなる超伝導体及びその製造方法 |
WO2010007929A1 (ja) | 2008-07-16 | 2010-01-21 | 独立行政法人科学技術振興機構 | 層状化合物及び超伝導体並びにそれらの製造方法 |
US9580307B2 (en) * | 2011-06-09 | 2017-02-28 | Cornell University | Single crystal mixed metal oxide nanosheet material compositions, methods and applications |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2001320095A (ja) * | 2000-03-03 | 2001-11-16 | Tohoku Techno Arch Co Ltd | 酸化物熱電材料 |
JP2002274943A (ja) * | 2001-03-19 | 2002-09-25 | Tohoku Techno Arch Co Ltd | 酸化物熱電材料 |
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2003
- 2003-01-27 JP JP2003017070A patent/JP4041883B2/ja not_active Expired - Lifetime
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2004
- 2004-01-21 DE DE602004008040T patent/DE602004008040T2/de not_active Expired - Lifetime
- 2004-01-21 WO PCT/JP2004/000511 patent/WO2004067450A1/ja active IP Right Grant
- 2004-01-21 US US10/543,089 patent/US20060257311A1/en not_active Abandoned
- 2004-01-21 EP EP04703937A patent/EP1595848B1/en not_active Expired - Fee Related
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JP2001320095A (ja) * | 2000-03-03 | 2001-11-16 | Tohoku Techno Arch Co Ltd | 酸化物熱電材料 |
JP2002274943A (ja) * | 2001-03-19 | 2002-09-25 | Tohoku Techno Arch Co Ltd | 酸化物熱電材料 |
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Publication number | Publication date |
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JP4041883B2 (ja) | 2008-02-06 |
EP1595848A4 (en) | 2006-03-29 |
JP2004262675A (ja) | 2004-09-24 |
EP1595848A1 (en) | 2005-11-16 |
DE602004008040T2 (de) | 2008-05-08 |
US20060257311A1 (en) | 2006-11-16 |
DE602004008040D1 (de) | 2007-09-20 |
EP1595848B1 (en) | 2007-08-08 |
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