WO2013161452A1 - 多孔性配位高分子-イオン液体複合体 - Google Patents
多孔性配位高分子-イオン液体複合体 Download PDFInfo
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- WO2013161452A1 WO2013161452A1 PCT/JP2013/057756 JP2013057756W WO2013161452A1 WO 2013161452 A1 WO2013161452 A1 WO 2013161452A1 JP 2013057756 W JP2013057756 W JP 2013057756W WO 2013161452 A1 WO2013161452 A1 WO 2013161452A1
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- Prior art keywords
- ionic liquid
- coordination polymer
- porous coordination
- pores
- porous
- Prior art date
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- 239000002608 ionic liquid Substances 0.000 title claims abstract description 214
- 239000002131 composite material Substances 0.000 title claims abstract description 78
- 239000011148 porous material Substances 0.000 claims abstract description 109
- 239000013259 porous coordination polymer Substances 0.000 claims abstract description 94
- 229910052751 metal Inorganic materials 0.000 claims abstract description 17
- 239000002184 metal Substances 0.000 claims abstract description 16
- 150000002500 ions Chemical class 0.000 claims description 50
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- 239000002253 acid Substances 0.000 claims description 16
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- 230000000717 retained effect Effects 0.000 claims description 4
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- 230000008018 melting Effects 0.000 description 64
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- ABMFBCRYHDZLRD-UHFFFAOYSA-N naphthalene-1,4-dicarboxylic acid Chemical compound C1=CC=C2C(C(=O)O)=CC=C(C(O)=O)C2=C1 ABMFBCRYHDZLRD-UHFFFAOYSA-N 0.000 description 3
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
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- 150000002367 halogens Chemical class 0.000 description 2
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- JOXIMZWYDAKGHI-UHFFFAOYSA-N toluene-4-sulfonic acid Chemical compound CC1=CC=C(S(O)(=O)=O)C=C1 JOXIMZWYDAKGHI-UHFFFAOYSA-N 0.000 description 2
- ZXMGHDIOOHOAAE-UHFFFAOYSA-N 1,1,1-trifluoro-n-(trifluoromethylsulfonyl)methanesulfonamide Chemical compound FC(F)(F)S(=O)(=O)NS(=O)(=O)C(F)(F)F ZXMGHDIOOHOAAE-UHFFFAOYSA-N 0.000 description 1
- NJMWOUFKYKNWDW-UHFFFAOYSA-N 1-ethyl-3-methylimidazolium Chemical compound CCN1C=C[N+](C)=C1 NJMWOUFKYKNWDW-UHFFFAOYSA-N 0.000 description 1
- BMQZYMYBQZGEEY-UHFFFAOYSA-M 1-ethyl-3-methylimidazolium chloride Chemical compound [Cl-].CCN1C=C[N+](C)=C1 BMQZYMYBQZGEEY-UHFFFAOYSA-M 0.000 description 1
- NEQFBGHQPUXOFH-UHFFFAOYSA-N 4-(4-carboxyphenyl)benzoic acid Chemical compound C1=CC(C(=O)O)=CC=C1C1=CC=C(C(O)=O)C=C1 NEQFBGHQPUXOFH-UHFFFAOYSA-N 0.000 description 1
- RZVAJINKPMORJF-UHFFFAOYSA-N Acetaminophen Chemical compound CC(=O)NC1=CC=C(O)C=C1 RZVAJINKPMORJF-UHFFFAOYSA-N 0.000 description 1
- 239000013147 Cu3(BTC)2 Substances 0.000 description 1
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- RWRDLPDLKQPQOW-UHFFFAOYSA-O Pyrrolidinium ion Chemical compound C1CC[NH2+]C1 RWRDLPDLKQPQOW-UHFFFAOYSA-O 0.000 description 1
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- 230000005540 biological transmission Effects 0.000 description 1
- LRESCJAINPKJTO-UHFFFAOYSA-N bis(trifluoromethylsulfonyl)azanide;1-ethyl-3-methylimidazol-3-ium Chemical compound CCN1C=C[N+](C)=C1.FC(F)(F)S(=O)(=O)[N-]S(=O)(=O)C(F)(F)F LRESCJAINPKJTO-UHFFFAOYSA-N 0.000 description 1
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Images
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
- H01G11/54—Electrolytes
- H01G11/56—Solid electrolytes, e.g. gels; Additives therein
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
- H01B1/06—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors mainly consisting of other non-metallic substances
- H01B1/12—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors mainly consisting of other non-metallic substances organic substances
- H01B1/122—Ionic conductors
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
- H01G11/54—Electrolytes
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/056—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes
- H01M10/0564—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes the electrolyte being constituted of organic materials only
- H01M10/0565—Polymeric materials, e.g. gel-type or solid-type
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/056—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes
- H01M10/0564—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes the electrolyte being constituted of organic materials only
- H01M10/0566—Liquid materials
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
- H01G11/54—Electrolytes
- H01G11/58—Liquid electrolytes
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M2300/00—Electrolytes
- H01M2300/0017—Non-aqueous electrolytes
- H01M2300/0025—Organic electrolyte
- H01M2300/0045—Room temperature molten salts comprising at least one organic ion
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M2300/00—Electrolytes
- H01M2300/0017—Non-aqueous electrolytes
- H01M2300/0065—Solid electrolytes
- H01M2300/0082—Organic polymers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
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- H01M2300/0088—Composites
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M2300/00—Electrolytes
- H01M2300/0088—Composites
- H01M2300/0091—Composites in the form of mixtures
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/13—Energy storage using capacitors
Definitions
- the present invention relates to a composite of a porous coordination polymer having pores and an ionic liquid, for example, a composite that functions as an electrolyte for an electrochemical device that can operate safely and in a wide temperature range.
- ionic liquids are used in electrochemical devices as electrolytes for batteries, electric double layer capacitors and the like because of their high ion conductivity. Since the ionic liquid has extremely high flame retardancy, when it is used as an electrolyte of an electrochemical device, an flammable organic solvent is not required, and an electrochemical device having high safety can be obtained.
- An ionic liquid generally refers to a salt having a melting point of 100 ° C. or lower. An ionic liquid has a higher melting point than an organic solvent, and it often solidifies at room temperature and does not function as an electrolyte for an electrochemical device.
- Patent Document 1 a method of reducing or lowering the melting point of the ionic liquid by filling or injecting the ionic liquid into nanopores of porous glass.
- Patent Document 1 a correlation between the size of the nanopore and the melting point of the filled ionic liquid has also been reported.
- Non-Patent Document 1 the example which filled the ionic liquid in the carbon nanotube as a material which has a micropore smaller than a nanopore has been reported (nonpatent literature 2).
- the porous glass described in Patent Document 1 it is difficult for the porous glass described in Patent Document 1 to make the pore diameter even smaller than the mesopores of about 75 mm. Therefore, when the pores of such porous glass are filled with an ionic liquid, the decrease in the melting point of the ionic liquid is about 30 ° C.
- the mesopore means a pore having a diameter of 20 to 500 mm.
- Non-Patent Document 2 an ionic liquid is filled into a carbon nanotube having a micropore having a smaller pore diameter, that is, a pore having a diameter of 2 nm or less.
- carbon nanotubes have electrical conductivity, they cannot be used as an electrolyte for electrochemical devices.
- Non-Patent Document 2 the melting point of the ionic liquid is increased by filling the carbon nanotube with the ionic liquid.
- none of the documents describes an example of filling a substance having no conductivity with an ionic liquid to raise the melting point.
- An object of the present invention is to provide a composite containing an ionic liquid that functions as an electrolyte of an electrochemical device that can operate safely and in a wide temperature range.
- a porous coordination polymer-ionic liquid composite comprising an insulating structure composed of a porous coordination polymer and an ionic liquid held in the pores of the porous coordination polymer .
- the porous coordination polymer includes a metal ion that is a Lewis acid and an organic ligand that is a Lewis base, and the Lewis acid and the Lewis base are a combination of a hard acid and a hard base in the HSAB rule.
- the porous coordination polymer-ionic liquid composite according to (1) which is any one of a combination of a soft acid and a soft base, and a combination of an intermediate hardness acid and an intermediate hardness base .
- the molded body has a plurality of voids provided between the particles, and has an ion conductive substance in at least some of the plurality of voids.
- Porous coordination polymer-ionic liquid composite. (10) The porous coordination polymer-ionic liquid composite according to (9), wherein the ion conductive substance is an ionic liquid.
- (11) The porous coordination polymer-ionic liquid composite according to (9) or (10), wherein the ion conductive substance is the same ionic liquid as the ionic liquid retained in the pores. .
- the melting point of the ionic liquid can be greatly lowered or raised, or the melting point can be controlled according to the application. it can.
- an electrolyte containing such a porous coordination polymer-ionic liquid composite an electrochemical device such as a battery or an electric double layer capacitor that can operate safely and in a wide temperature range can be realized.
- FIG. 1 is a schematic view showing one embodiment of a porous coordination polymer-ionic liquid composite according to the present invention, wherein (A) shows a porous coordination polymer-ionic liquid composite, and (B) shows a composite. The previous porous coordination polymer (insulating structure) and ionic liquid are shown.
- 2 is a chart showing the results of X-ray diffraction (XRD) measurement, A is a chart showing the results of MIL-53 (Al) single powder, and B is a composite powder of MIL-53 (Al) and EMI-TFSI. It is a chart which shows the result about.
- FIG. 6 is a cross-sectional view showing another embodiment of the porous coordination polymer-ionic liquid composite according to the present invention, in which (A) is a molded body (structure) composed of a plurality of particles made of a porous coordination polymer.
- (B) shows a porous coordination polymer-ionic liquid composite in which an ionic liquid is injected and held in the structure of (A).
- FIG. It is a schematic diagram which shows shape
- FIG. 2 is a chart showing the results of differential scanning calorimetry (DSC)
- A is a chart showing the results for EMI-Cl alone
- B is a sample No. in Example.
- 8 is a chart showing the results for the composite of No. 8, wherein C is the sample No. in Example. 7 is a chart showing the results for the composite of No. 7.
- 19 is a 19 F NMR spectrum of an ionic liquid EMI-TFSI at ⁇ 120 ° C., ⁇ 30 ° C., and 0 ° C.
- FIG. A porous coordination polymer-ionic liquid composite produced by mixing porous coordination polymer ZIF-8 and ionic liquid EMI-TFSI at a mass ratio of 1: 0.24 and heating at 200 ° C. for 15 hours.
- FIG. 5 is a graph showing the temperature dependence of the half width of 19 F NMR spectrum at ⁇ 150 to 30 ° C.
- A showing ionic liquid EMI-TFSI
- B showing porous coordination polymer ZIF-8 and ionic liquid EMI-TFSI.
- A shows ionic liquid EMI-TFSI
- B is mass ratio of porous coordination polymer ZIF-8 and ionic liquid EMI-TFSI.
- a porous coordination polymer-ionic liquid composite prepared by mixing at 1: 0.37 and heating at 200 ° C. for 15 hours is shown.
- FIG. 1 is a schematic view showing one embodiment of a porous coordination polymer-ionic liquid composite according to the present invention.
- the composite 3 is composed of an insulating structure 1 having pores 1a and an ionic liquid 2, and the ionic liquid 2 is held in the pores 1a.
- the porous coordination polymer is uniform because it has a large number of pores 1a in the micropore region and the diameter of the pores 1a is determined from the crystal structure. Therefore, the physical properties such as the melting point of the ionic liquid 2 held in the pores 1a become uniform. Furthermore, the pore 1a of the porous coordination polymer is derived from the crystal lattice as described above. Therefore, the structure 1 having the pores 1a having a uniform pore diameter in the micropore region can be manufactured with good reproducibility.
- porous coordination polymers include: Zn (MeIM) 2 (hereinafter referred to as ZIF-8) Al (OH) [BDC] (hereinafter referred to as MIL-53 (Al)) Cr (OH) [BDC] (hereinafter referred to as MIL-53 (Cr)) Fe (OH) [BDC] (hereinafter referred to as MIL-53 (Fe)) Zn 2 (DOBDC) (hereinafter referred to as MOF-74 (Zn)) Mg 2 (DOBDC) (hereinafter referred to as MOF-74 (Mg)) Al (OH) (1,4-NDC) Cr 3 F (H 2 O) 2 O (BDC) 3 (hereinafter referred to as MIL-101 (Cr)) Al 8 (OH) 12 ⁇ (OH) 3 (H 2 O) 3 ⁇ [BTC] 3 (hereinafter referred to as MIL-110 (Al)) Cu 3 (BTC) 2 (hereinafter referred to as ZIF
- HMeIM 2-methylimidazole
- BDC 1,4-benzenedicarboxylic acid
- DOBDC 2,5-dihydroxyterephthalic acid
- H 2 NDC 1,4-naphthalenedicarboxylic acid
- BTC 1,3,5-benzene
- BPDC 4,4′-biphenyldicarboxylic acid
- H 2 TPDC 4,4 ′′ -p-terphenyldicarboxylic acid.
- the structure 1 is required to have durability against an ionic liquid.
- a porous coordination polymer in which the main chain is formed by coordination bonding of an organic ligand to a metal ion is equivalent to the case where the metal ion is a Lewis acid and the organic ligand is a Lewis base.
- the crystalline structure of the porous coordination polymer can be maintained even when it comes into contact with the ionic liquid 2.
- a hard acid and a hard base have a strong bond
- a soft acid and a soft base have a strong bond.
- the metal ion is a Lewis acid and the organic ligand is a Lewis base, and the strength of these bonds dominates the resistance of the porous coordination polymer to the ionic liquid.
- hard acids examples include Thomas, G. Medicinal Chemistry: An Introduction, 2nd edition; Wiley: New York, 2007.
- 1,4-benzenedicarboxylic acid, 2,5-dihydroxyterephthalic acid, 1,4-naphthalenedicarboxylic acid, 1,3,5-benzenetricarboxylic acid and the like are hard bases having a structure of RCOO ⁇ in the molecule. is there.
- a porous coordination polymer obtained from these compounds and a metal ion which is a hard acid is an ionic liquid.
- a metal ion which is a hard acid for example, Al 3+ , Cr 3+ , Mg 2+ , Fe 3+ , Zr 4+
- MIL-101 (Cr) metal ions of Mg 2+ MOF-74 (Mg)
- metal ions of Fe 3+ MIL-53 (Fe) metal ions of Zr 4+ UiO -66, UiO-67, UiO-68 and the like.
- a porous coordination obtained from the above compound that is a hard base and a metal ion that is an acid having an intermediate hardness (for example, Fe 2+ , Co 2+ , Zn 2+ , Cu 2+, etc.)
- the polymer is slightly less resistant to ionic liquids than a porous coordination polymer obtained from a hard base and a hard acid.
- Such porous coordination polymer specifically, MOF-74 metal ions Zn 2+ (Zn), metal ions, and the like HKUST-1 of Cu 2+.
- imidazole is a base with intermediate hardness.
- a porous coordination polymer obtained from an imidazole-based ligand and a metal ion that is an acid having intermediate hardness has excellent resistance to an ionic liquid.
- ZIF Zero Immediate Frameworks
- the metal ion does not have a coordination unsaturated site. If the metal ion has a coordination unsaturated site, it becomes easy for the anion of the ionic liquid to approach the metal ion of the porous coordination polymer. As a result, the bond between the metal ion and the organic ligand is weakened, and the porous coordination polymer may be destroyed. That is, MIL-53 (Al), Al (OH) (1,4-NDC), MIL-53 (Cr), MIL-53 (Fe), and ZIF system (ZIF-) having no coordination unsaturated site 8) has excellent resistance to ionic liquids.
- MIL-101 Cr
- MOF-74 Mg
- MOF-74 Zn
- HKUST-1 UiO-66
- UiO-67 UiO-68 having coordination unsaturated sites
- each metal ion is coordinated to six oxygen atoms. Five of the six are oxygen atoms of the organic ligand, and the remaining one is an oxygen atom of a solvent (for example, DMF) molecule.
- a solvent for example, DMF
- solvent molecules coordinated to metal ions can be removed.
- one of the six coordination sites of metal ions is vacant and a coordination unsaturated site is formed.
- each Zr 4+ is coordinated to eight oxygen atoms.
- oxygen atoms of the organic ligand Four of the eight are oxygen atoms of the organic ligand, two are oxygen atoms derived from O 2 ⁇ , and the remaining two are oxygen atoms derived from OH ⁇ .
- the oxygen atoms coordinated to each Zr 4+ are changed to the four oxygen atoms of the organic ligand and O 2 ⁇ . It changes to 3 oxygen atoms. As a result, one coordination unsaturated site is formed.
- the coordination sites of metal ions are all occupied by oxygen atoms and nitrogen atoms of the organic ligand, so there are no coordination unsaturated sites.
- the anion of the ionic liquid easily coordinates to the coordination unsaturated site of the metal ion, and the coordination unsaturated site disappears. It is thought that there is.
- the coordination unsaturated site can be formed by removing the ionic liquid in the pores in the porous coordination polymer and further performing heating or the like while evacuating, It is defined as “a porous coordination polymer has coordination unsaturated sites”. By removing the ionic liquid in the pores and performing heating or the like while evacuating, it can be confirmed by infrared spectroscopy, elemental analysis, or the like whether or not a coordination unsaturated site has been formed.
- the metal ion is preferably a typical metal element.
- the typical metal element refers to a metal element that does not belong to the transition metal series, for example, a metal element belonging to Group 1, Group 2, Group 12 to Group 18 of the periodic table. In other words, electrons are sequentially arranged in the s or p orbit of the outermost shell, and have a characteristic property as a metal thereon. Since the valence of typical metal elements is difficult to change, the porous coordination polymer containing these in the main chain can maintain the crystal structure of the porous coordination polymer even when it comes into contact with the ionic liquid 2.
- porous coordination polymers include MIL-53 (Al), Al (OH) (1,4-NDC), ZIF-8, and ZIF, wherein the metal ion is Zn 2+ Is mentioned.
- the porous coordination polymer is synthesized by using a metal compound and an organic compound as raw materials and reacting them in a reaction solvent.
- the metal compound is a source of metal ions, and examples thereof include metal nitrate.
- An organic compound is a supply source of an organic ligand, and examples thereof include 1,4-benzenedicarboxylic acid (common name: terephthalic acid), 1,4-naphthalenedicarboxylic acid, 2-methylimidazole, and the like.
- the reaction solvent is not particularly limited as long as it can dissolve a metal compound and an organic compound, and examples thereof include water, N, N-dimethylformamide (DMF), and methanol. Moreover, you may use an ionic liquid as a reaction solvent.
- a metal compound and an organic compound are mixed in the reaction solvent and stirred at room temperature or held at 100 to 200 ° C. for 5 to 100 hours in a pressure vessel. Thereby, a metal ion and an organic ligand react, and a coordination bond is formed, and a porous coordination polymer is formed. After the reaction, the porous coordination polymer particles precipitated in the reaction solvent are collected by a technique such as filtration or centrifugation.
- a film-like porous coordination polymer may be produced by applying a solution containing a metal compound and an organic compound to a substrate and reacting the solution at room temperature or high temperature.
- the reaction may be performed in an inert gas atmosphere in order to prevent deterioration of the raw material.
- the reaction solvent is removed by washing and drying to obtain a porous coordination polymer powder or membrane. Whether or not the porous coordination polymer is formed can be confirmed by performing powder X-ray diffraction (XRD) measurement of the obtained porous coordination polymer and analyzing the obtained diffraction pattern.
- XRD powder X-ray diffraction
- the structure 1 made of such a porous coordination polymer is used as an insulating material having no insulating property, that is, no electron conductivity, and the ionic liquid 2 is held inside the pore 1a.
- the composite 3 has an ionic conductivity but no electronic conductivity, and can be used as an electrolyte of a battery or an electric double layer capacitor.
- the melting point of the ionic liquid 2 when the mesopore such as porous glass is filled with the ionic liquid 2 (see, for example, Patent Document 1), and further equivalent to the micropore
- the melting point of the ionic liquid 2 can be significantly reduced as compared with the melting point of the ionic liquid 2 expected when the ionic liquid 2 is filled in the pores having the diameters of 1 and 2. This is because when the size of the pores 1a holding the ionic liquid 2 is in the micropore region, the number of ion pairs that can exist in the pores 1a is less than or equal to the order of 10 pairs in the diameter direction of the pores 1a.
- the ionic liquid 2 Due to the decrease to When the ionic liquid 2 is solidified, it is necessary that the cations and anions constituting the ionic liquid 2 are regularly arranged by hydrogen bonds.
- the size of the pore 1a is in the micropore region, the number of ions present in the pore 1a is extremely reduced. Therefore, it is difficult to find other ions having different polarities, and it becomes difficult to form ion pairs and further solidify the ionic liquid. As a result, it is considered that the melting point of the ionic liquid 2 is significantly reduced.
- porous coordination polymers have the property that the size of the pores expands or contracts depending on the molecules present in the pores.
- the pores 1a have an optimal size so that the cations and the anions are regularly arranged. Deform. Therefore, it is considered that the ionic liquid 2 becomes stable in the solid state and the melting point increases.
- the porous coordination polymer having the property that the pore size expands or contracts include MIL-53 (Al).
- micropores are defined as pores with a diameter of 2 nm or less. Similarly, pores with a diameter of 2 to 50 nm are mesopores and pores with a diameter of 50 nm or more are macropores. Is defined.
- the ionic liquid generally means a salt having a melting point of 100 ° C. or lower. However, in the present specification, the term “ionic liquid” includes a salt that has a melting point of 100 ° C. or lower when held in the pores.
- the diameter of the pore 1a is preferably 1.5 nm or less, whereby the melting point of the ionic liquid 2 can be further greatly reduced. Moreover, it is preferable that the diameter of the pore 1a is 0.3 nm or more. This is because it becomes difficult for ions constituting the ionic liquid to be present in the pores 1a smaller than 0.3 nm.
- the diameter of the pore 1a can be measured by, for example, a gas adsorption method or can be obtained from a crystal structure obtained by X-ray structure analysis. When measuring by the gas adsorption method, the measurement may be performed after removing the ionic liquid or adsorbate in the pores 1a by washing the complex 3 with water or the like.
- the diameter of the pore 1a is the average value of the measured pore diameter distribution, or when the structure 1 has pores 1a derived from a crystal structure as shown in FIG.
- the pore 1a is regarded as a micropore region.
- the shape of the pore 1a may be one-dimensional, two-dimensional, or three-dimensional, but is preferably three-dimensional. If the shape of the pores 1a is three-dimensional, the ion conduction path is most reliably constructed. In other words, the ion conduction path is formed isotropically, the interconnection is facilitated, and the ionic conductivity is increased.
- the shape of the structure 1 is not particularly limited, and may be any shape such as a particle shape, a wire shape, a rod shape, a sheet shape, a film shape, and a bulk shape. May be.
- the distance from the outer periphery of the structure 1 to the center is preferably 10 ⁇ m or less. Therefore, the shape of the structure 1 is more preferably a particle shape having a diameter of 20 ⁇ m or less, a linear shape, a rod shape, or a film shape having a thickness of 20 ⁇ m or less.
- Examples of the ionic liquid 2 include imidazolium salts, pyrrolidinium salts, pyridinium salts, quaternary ammonium salts, quaternary phosphonium salts, and sulfonium salts.
- Alkali metal salts such as lithium salts and sodium salts may be used.
- imidazolium salts having a relatively small cation size and a low melting point are particularly preferably used.
- Examples of anions include halogens such as Cl ⁇ and Br ⁇ , BF 4 ⁇ , PF 6 ⁇ , CF 3 SO 3 ⁇ , FSO 2 NSO 2 F ⁇ (FSI), and CF 3 SO 2 NSO 2 CF 3 ⁇ (TFSI).
- the porous coordination polymer having a slightly low resistance to the ionic liquid as described above has a high degree of dissociation and the ionic liquid 2 in which the cation and the anion easily move separately, for example, 1-ethyl-3-methylimidazolium, for example.
- EMI-TFSI bis (trifluoromethanesulfonyl) imide
- an ionic liquid 2 having a low dissociation degree for example, pyrrolidinium ion, piperidinium ion, pyridinium ion, aliphatic quaternary ammonium ion as a cation , Aliphatic quaternary phosphonium ions, those containing aliphatic tertiary sulfonium ions, or halogens such as Cl ⁇ and Br ⁇ as anions, BF 4 ⁇ , PF 6 ⁇ , CF 3 SO 3 ⁇ , ClO 4 ⁇ , SO 3 C 6 H 4 CH 3 - ( p- toluenesulfonate), SCN - and may be used such as those comprising a.
- the ionic liquid 2 Before injecting the ionic liquid 2 into the pores 1a of the structure 1, it is preferable to remove molecules and ions adsorbed inside the pores 1a. If molecules or ions adsorbed in the pores 1a remain, the pores 1a are narrowed or completely blocked by the molecules or ions, and the ionic liquid 2 is injected into the pores 1a. It becomes difficult. In addition, there is a concern that the physical properties of the ionic liquid 2 change due to the mixing of impurities, making it difficult to control the melting point.
- a method for removing molecules and ions adsorbed inside the pores 1a for example, a method of washing the structure 1 with a cleaning liquid and washing away the molecules and ions adsorbed inside the pores 1a, or a heat treatment at a high temperature.
- the cleaning liquid water, methanol, ethanol, dimethylformamide and the like are preferably used. After the cleaning, it is preferable to remove the cleaning liquid by subjecting the structure 1 to heat treatment, vacuum processing, vacuum heat processing or the like so that the cleaning liquid does not remain inside the pores 1a.
- the ionic liquid 2 As a method of injecting the ionic liquid 2 into the pores 1a, when the structure 1 having the pores 1a is in the form of particles, for example, a method in which a mixture of the particles of the structure 1 and the ionic liquid 2 is allowed to stand. Is mentioned.
- the mixture In order to promote the diffusion of the ionic liquid 2 into the structure 1, the mixture may be left in a temperature environment of about 100 to 200 ° C., for example. Basically, the higher the temperature, the easier the ionic liquid 2 diffuses in the pores 1a. However, if the temperature is too high, there is a concern that the structure 1 and the ionic liquid 2 are likely to react. And the ionic liquid 2 are combined to adjust the standing temperature as appropriate.
- the ionic liquid 2 is preferably injected into the structure 1 in a dry atmosphere having a dew point of ⁇ 20 ° C. or lower, for example. Further, in order to prevent a chemical reaction such as redox of the structure 1 or the ionic liquid 2, it is more preferable to perform an implantation process in a vacuum or in an inert atmosphere such as nitrogen or argon.
- an ionic liquid is applied to the surface of the film-like structure 1 formed on the base material, or the film-like structure 1 is immersed in the ionic liquid together with the base material.
- An ion conductive film including the composite 3 is obtained by injecting the ionic liquid 2 into the structure 1 of FIG.
- the excess ionic liquid may be removed by washing with a solvent such as water or methanol, and absorbing by pressing a filter paper.
- the ion conductive film including the composite 3 can be produced by forming a slurry in which the particles of the composite 1 are dispersed in the ionic liquid 2 into a film or a sheet by a known coating method or tape forming method. Excess ionic liquid may be removed by washing with a solvent such as water or methanol, absorbing by pressing a filter paper, as in the case of the membrane-like structure 1.
- the mixing ratio of the structure 1 having the pores 1a and the ionic liquid 2 is preferably mixed so that the total volume of the pores 1a included in the structure 1 and the volume of the ionic liquid 2 are equal.
- the liquid 2 may be mixed at a ratio such that the liquid 2 is too small or excessive.
- the volume of the ionic liquid 2 with respect to the total volume of the pores 1a is preferably 20% or more. If it is less than 20%, the path of the ionic liquid is interrupted, and ion conduction may be interrupted.
- the volume of the ionic liquid 2 with respect to the whole volume of the pore 1a is less than 200% (2 times).
- the fact that the ionic liquid 2 is retained inside the pores 1a of the structure 1 means that, for example, the differential scanning calorimetry (DSC) of the ionic liquid 2 alone and the complex 3 is performed, and the temperature at which a peak indicating exotherm or endotherm appears. However, it may be confirmed whether or not the ionic liquid 2 alone and the complex 3 are different. Or when the ionic liquid 2 exists excessively with respect to the volume of the pore 1a of the structure 1, the same melting
- DSC differential scanning calorimetry
- the composite 3 is evaluated while changing the measurement temperature by a method such as solid nuclear magnetic resonance (NMR) analysis or AC impedance method, and a phase at a temperature lower than the melting point of the ionic liquid 2 alone is measured.
- NMR solid nuclear magnetic resonance
- AC impedance method AC impedance method
- the ionic liquid 2 is retained in the pore 1a from the analysis of the X-ray diffraction (XRD) pattern of the composite 3
- XRD X-ray diffraction
- the type of the substance occluded in the pore 1a can be determined from the analysis of the X-ray diffraction (XRD) pattern.
- the kind and composition of the porous coordination polymer or ionic liquid used may be specified by elemental analysis, X-ray diffraction (XRD) measurement, nuclear magnetic resonance (NMR) analysis, or the like.
- FIG. 3A shows a cross-sectional view of the structure 11 used in this embodiment
- FIG. 3B shows a composite 131 obtained by injecting the ionic liquid 12 into the pores of the structure 11.
- the structure 11 is a molded body obtained by compression molding a plurality of particles 111 made of a porous coordination polymer.
- the composite 131 obtained by using such a structure 11 is used as an electrolyte of a battery or an electric double layer capacitor, the structure 11 has a dense structure, and thus an ion conduction path between particles is easily connected. Become. Therefore, such a composite 131 becomes a good ionic conductor.
- the ion conductive material 5 is preferably present in at least some of the plurality of voids.
- the presence of the ion conductive material 5 in the gap forms an ion conduction path.
- the ion conductive substance 5 include water, an organic electrolyte, an ionic liquid, and an ion conductive polymer. Among these, it is preferable to use an ionic liquid from the viewpoint of high ion conductivity and low vapor pressure.
- ionic liquids with low vapor pressure are not lost by evaporation.
- ion conduction inside and outside the particles of the composite 132 becomes smoother, which is preferable.
- a solid ion conductive substance may be used as the ion conductive substance 5.
- the solid ion conductive material include particles of an ion conductive polymer, particles of an inorganic ion conductive material, and the like.
- solid ionic conductive materials have low ionic conductivity, but the composite 132 is responsible for the main ionic conduction path, and the ionic conductive material 5 is an auxiliary position. small.
- solid ion conductive materials it is particularly preferable to fill the gap with an ion conductive polymer from the viewpoint that the shape of the structure 11 can be easily maintained.
- the structure 11 is obtained by pressure-forming a plurality of particles 111 made of a porous coordination polymer by a known method such as uniaxial pressing, isostatic pressing, roller rolling, and extrusion molding.
- the structure 11 is obtained by forming a slurry in which a plurality of particles 111 made of a porous coordination polymer are dispersed in a solvent by a known sheet forming method such as tape casting, slip casting, spin coating, and drying. Can also be obtained.
- the ionic liquid 12 is injected into the pores of the structure 11 obtained in this way.
- the injection method is as described above.
- the ion conductive substance 5 When the ion conductive substance 5 is used, the ion conductive substance 5 is usually injected into the space between the particles 111 after the injection of the ionic liquid 12.
- the ion conductive material 5 may be prepared by mixing the porous coordination polymer particles 111 and the solid (powder) ion conductive material 5 or using the liquid ion conductive material 5 as a solvent. , And may be present in the voids between the particles 111.
- the injected particles may be formed into a desired shape.
- the ion conductive material 5 may exist in the gap between the particles 111.
- 3 to 5 exemplify a structure 11 in which a plurality of particles 111 made of a porous coordination polymer are irregularly arranged, but may be regularly arranged.
- the shape of the structure 11 is not specifically limited, For example, spherical shape, columnar shape (columnar shape and prismatic shape), weight shape (conical shape and pyramid shape), wire (line) shape, rod
- a desired shape such as a (bar) shape, a sheet (plate) shape, or a film shape is employed.
- composites 131 and 132 may contain an additive such as a binder as long as the effects of the present invention are not impaired.
- ZIF-8 as an insulating structure having pores (hereinafter sometimes simply referred to as “structure”), and Al (OH) (1,4-NDC) synthesized by the following method And MOF-74 (Zn) powder. All of these have pores in a micropore region having a diameter of 2 nm or less as shown in Table 1.
- Al (OH) (1,4-NDC) particles are separated by suction filtration, washed with ion-exchanged water, subjected to suction filtration, and dried at room temperature for 1 hour, whereby Al (OH) (1,4 -NDC) powder was obtained.
- MOF-74 (Zn) particles were separated by suction filtration, washed sequentially with DMF and ethanol, suction filtered, and dried at room temperature for 1 hour to obtain MOF-74 (Zn) powder.
- the crystal structure of the porous coordination polymer was confirmed by X-ray diffraction (XRD) measurement, and it was confirmed that the porous coordination polymer was formed.
- the ZIF-8 powder was also washed with a suitable solvent and dried to remove molecules adsorbed inside the pores.
- the powders of these structures were subjected to a vacuum drying process (150 ° C., 15 hours) to remove moisture in the pores.
- the particle diameters of the powders of these structures were confirmed by observation with a transmission electron microscope (TEM), and those having an average particle diameter of 0.1 ⁇ m by image analysis were used.
- TEM transmission electron microscope
- ionic liquid examples include 1-ethyl-3-methylimidazolium bis (trifluoromethanesulfonyl) imide (hereinafter sometimes referred to as EMI-TFSI), and 1-ethyl-3-methylimidazolium chloride (hereinafter referred to as EMI). -Cl may be described). These ionic liquids were also subjected to a vacuum drying treatment (150 ° C., 15 hours) to remove moisture.
- EMI-TFSI 1-ethyl-3-methylimidazolium bis (trifluoromethanesulfonyl) imide
- EMI 1-ethyl-3-methylimidazolium chloride
- the obtained composite was subjected to differential scanning calorimetry (DSC) in the temperature range of ⁇ 150 to 100 ° C.
- the temperature was increased / decreased at a rate of 5 ° C./min in the temperature range of ⁇ 150 to ⁇ 100 ° C. and 1 ° C./min in the temperature range of ⁇ 100 to 100 ° C.
- Table 1 shows melting points observed in the temperature raising process. However, when neither an endothermic peak nor an exothermic peak was observed in the measurement temperature range, the melting point was described as being lower than ⁇ 150 ° C.
- FIG. 4 shows EMI-Cl alone and sample no.
- the measurement results of the temperature rising process at 0 to 100 ° C. in the differential scanning calorimetry (DSC) of 7 and 8 are shown.
- 4A is a composite of EMI-Cl alone
- an endothermic peak appears around 84 ° C.
- the melting point of EMI-Cl alone is about 84 ° C.
- Non-Patent Document 1 when an ionic liquid is injected into ZIF-8 having pores with a diameter of 1.2 nm, the melting point is expected to decrease by about 140 to 187 ° C. In this example, This indicates a melting point lower by 50 ° C. or more.
- Sample No. 4 5, and 12, Sample No. Similar to 8, no peak corresponding to melting or solidification appears in the range of ⁇ 150 to 100 ° C., and all the ionic liquid is present in the pores of the structure, and the melting point is lower than ⁇ 150 ° C. It is thought. Sample No. The melting points observed for 3 and 11 are as follows: 7 is an excess of ionic liquid that could not penetrate into the pores of the structure. Sample No. The melting point of the ionic liquid (EMI-TFSI) used in 1 to 5 and 9 to 13 is ⁇ 17 ° C.
- EMI-TFSI EMI-TFSI
- sample no. DSC measurements were performed on 18 and 19.
- Sample No. 19 the reason why the two melting points of 20 ° C. and 41 ° C. are described is that peaks appear at two locations near 20 ° C. and 41 ° C. in the DSC pattern.
- Sample No. Nos. 14 and 15 use MIL-101 (Cr) and HKUST-1 having a coordination unsaturated site as a porous coordination polymer. They also contain transition metals in the main chain.
- EMI-TFSI used as an ionic liquid is an ionic liquid having a high degree of dissociation and in which a cation and an anion easily move separately. As described above, when a porous coordination polymer having coordination unsaturated sites and having slightly low resistance to ionic liquid is mixed with EMI-TFSI having a high degree of dissociation, a large number of coordination unsaturated sites are formed around the coordination unsaturated sites.
- the anion approaches and weakens the bond between the metal ion of the porous coordination polymer and the organic ligand. Furthermore, the transition metal contained in the main chain of these porous coordination polymers easily changes in valence due to contact with the ionic liquid, and the crystal structure easily changes. It is thought that the porous coordination polymer was destroyed by these factors.
- FIG. 7 shows the 19 F NMR spectrum of the ionic liquid EMI-TFSI. It is TFSI ⁇ that contains a fluorine atom, and the 19 F NMR spectrum can be considered as observing the motion state of TFSI ⁇ .
- a broad peak was observed at -120 ° C. This is probably because the EMI-TFSI is solidified and the peak is broadened. When this was heated, a sharp peak appeared at ⁇ 30 ° C. This is probably because EMI-TFSI was partially melted, and a part of TFSI ⁇ was able to move freely, resulting in the occurrence of the motional narrowing in which the peak sharpened. Further heating to 0 ° C. completely sharpened the peak. This indicates that all TFSI ⁇ can move freely, and that all EMI-TFSI has melted.
- FIG. 8 shows a 19 F NMR spectrum of a complex of ZIF-8 and EMI-TFSI.
- EMI-TFSI remains outside the pores of ZIF-8, a sharpened peak as shown in FIG. 7 should appear. However, since such a sharpened peak is not seen, it can be seen that all of the EMI-TFSI was taken into the pores of ZIF-8.
- FIG. 9 shows the temperature dependence of the half width of the 19 F NMR spectrum of the ionic liquid EMI-TFSI and the complex of ZIF-8 and EMI-TFSI.
- the EMI-TFSI of A showed a sharp decrease in the half-width at around ⁇ 30 ° C. This is because the peak is sharpened by melting as described above.
- the complex of ZIF-8 and EMI-TFSI in B in FIG. 9 did not undergo a sudden change in half-value width, and the half-value width continuously decreased with temperature. This indicates that by confining EMI-TFSI in the pores of ZIF-8, no solidification and melting of EMI-TFSI occurred.
- the reason why the full width at half maximum near room temperature is larger than that in the case of EMI-TFSI alone is that ions of EMI-TFSI are confined in the pores of ZIF-8, and the mobility of ions is slightly lowered.
- FIG. 10 shows the temperature dependence of ionic conductivity.
- the value of ionic conductivity is normalized by the value of ionic conductivity at room temperature.
- the sample was sandwiched between electrodes made of SUS, and the ionic conductivity was evaluated by an AC impedance method in a dry argon atmosphere.
- the measurement frequency is 1 Hz to 1 MHz.
- A is the ionic conductivity of EMI-TFSI.
- EMI-TFSI the ionic conductivity of EMI-TFSI.
- three filter papers having a diameter of 3 mm and a thickness of 0.15 mm were stacked, and EMI-TFSI was impregnated therewith.
- the melting point of EMI-TFSI is ⁇ 17 ° C., but abrupt changes in ionic conductivity occur in the vicinity. That is, it can be seen that the ionic conductivity is extremely low because it is solidified at a low temperature, and the conductivity is rapidly increased by melting at a high temperature.
- B in FIG. 10 represents the ionic conductivity of the complex of ZIF-8 and EMI-TFSI.
- the obtained mixture was heated at 200 ° C. for 15 hours, and this powder was press-molded to a diameter of 3 mm and a thickness of 0.5 mm to prepare a sample. Similar to the half width of the 19 F NMR spectrum, the ionic conductivity of this sample shows a continuous change with temperature, and the decrease in ionic conductivity at low temperatures is smaller than that of EMI-TFSI alone. That is, the complex of ZIF-8 and EMI-TFSI is a promising ionic conductor that operates even at low temperatures.
- the composite of the present invention can greatly reduce the melting point of the ionic liquid by holding the ionic liquid in the pores of the porous coordination molecule having the pores in the micropore region.
- it was found that it can be used as an electrolyte for an electric double layer capacitor in a wide temperature range equal to or higher than that when an organic solvent is used as the electrolyte.
- the porous coordination polymer-ionic liquid composite according to the present invention is used for, for example, electrochemical devices.
- Such an electrochemical device is obtained by disposing an electrolyte layer containing the composite of the present invention between a pair of electrodes and enclosing it in an outer package.
- an electrode an electrode containing an active material, for example, a sintered body of an active material such as a metal oxide or a composite oxide, a material in which an active material is hardened with a conductive agent, a metal, a carbon-based material, or the like is used. That's fine.
- the electrode and the composite may be in contact with each other via an electrolytic solution, but if they are in direct contact, direct exchange of ions between the electrode and the ionic liquid (or ion conductive material) inside the composite is possible. Is preferable.
- the exterior body a generally used form and material may be used, but it may be simply covered with an insulating resin or the like.
- the melting point of the ionic liquid in the porous coordination polymer-ionic liquid composite according to the present invention is higher than the melting point of the ionic liquid alone, it is used as an ionic liquid absorbent for preventing leakage.
- the absorbed ionic liquid may leak again.
- a specific porous coordination polymer is used as an adsorbent and the composite of the present invention is formed, the absorbed ionic liquid is immediately solidified, which can more reliably prevent leakage of the ionic liquid. it can.
- the melting point of the ionic liquid in the composite according to the present invention is higher than the melting point of the ionic liquid alone, it is possible to concentrate lithium ions and the like in the ionic liquid.
- the above sample No. The melting point of the ionic liquid in the composite obtained in 18 is 56 ° C., and the melting point of the used ionic liquid (EMI-TFSI) alone is ⁇ 17 ° C.
- EMI-TFSI used ionic liquid
- MIL-53 (Al) powder is put into an ionic liquid in which lithium salt is dissolved and maintained at about 65 ° C., only when lithium ions enter the pores of MIL-53 (Al), The ionic liquid solidifies (because the melting point of the ionic liquid increases when a large amount of lithium salt is dissolved). Therefore, it is possible to fill the MIL-53 (Al) pores with an ionic liquid with an increased lithium ion concentration.
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Abstract
Description
イオン液体とは、一般に100℃以下の融点を有する塩のことをいう。イオン液体は有機溶媒と比較すると融点が高く、室温では固体化して、電気化学デバイスの電解質として機能しないものも多い。このようなイオン液体を、室温以下でも電解質として機能させるため、多孔質ガラスのナノ細孔内にイオン液体を充填あるいは注入して、イオン液体の融点を低下させる方法(特許文献1)が提案されている。さらに、ナノ細孔のサイズと充填されたイオン液体の融点との相関についても報告されている(非特許文献1)。また、ナノ細孔よりもサイズの小さいマイクロ孔を有する材料として、カーボンナノチューブ中にイオン液体を充填した事例が報告されている(非特許文献2)。
(1)多孔性配位高分子からなる絶縁性の構造体と、前記多孔性配位高分子の細孔内に保持されたイオン液体とを有する、多孔性配位高分子-イオン液体複合体。
(2)前記多孔性配位高分子が、ルイス酸である金属イオンとルイス塩基である有機配位子とを含み、前記ルイス酸および前記ルイス塩基が、HSAB則における硬い酸および硬い塩基の組合せ、柔らかい酸および柔らかい塩基の組合せ、ならびに中間的な硬さの酸と中間的な硬さの塩基の組合せのいずれかである、(1)に記載の多孔性配位高分子-イオン液体複合体。
(3)前記多孔性配位高分子が、配位不飽和サイトを有していない、(1)または(2)に記載の多孔性配位高分子-イオン液体複合体。
(4)前記多孔性配位高分子が、主鎖に典型金属元素を含む、(1)~(3)のいずれかに記載の多孔性配位高分子-イオン液体複合体。
(5)前記典型金属元素が、ZnまたはAlである、(4)に記載の多孔性配位高分子-イオン液体複合体。
(6)前記構造体が、膜状である、(1)~(5)のいずれかに記載の多孔性配位高分子-イオン液体複合体。
(7)前記構造体が、粒子状である、(1)~(5)のいずれかに記載の多孔性配位高分子-イオン液体複合体。
(8)前記構造体が、前記多孔性配位高分子からなる複数の粒子によって構成された成形体である、(1)~(5)のいずれかに記載の多孔性配位高分子-イオン液体複合体。
(9)前記成形体が、前記粒子間に設けられた複数の空隙を有し、該複数の空隙のうち少なくとも一部の空隙に、イオン伝導性物質を有している、(8)に記載の多孔性配位高分子-イオン液体複合体。
(10)前記イオン伝導性物質が、イオン液体である、(9)に記載の多孔性配位高分子-イオン液体複合体。
(11)前記イオン伝導性物質が、前記細孔内に保持されているイオン液体と同一のイオン液体である、(9)または(10)に記載の多孔性配位高分子-イオン液体複合体。
図1(A)に示すように、複合体3は、細孔1aを有する絶縁性の構造体1と、イオン液体2とから構成され、イオン液体2は細孔1a内に保持されている。
多孔性配位高分子は、マイクロ孔領域の細孔1aを多数有している上に、細孔1aの直径が結晶構造に由来して決定されるために均一である。したがって、細孔1a内に保持されているイオン液体2の融点などの物性が均一になる。さらに、多孔性配位高分子の細孔1aは、上記のように結晶格子に由来する。そのため、マイクロ孔領域で、均一な細孔径の細孔1aを有する構造体1を再現良く製造することができる。
Zn(MeIM)2(以下、ZIF-8と記載する)
Al(OH)[BDC](以下、MIL-53(Al)と記載する)
Cr(OH)[BDC](以下、MIL-53(Cr)と記載する)
Fe(OH)[BDC](以下、MIL-53(Fe)と記載する)
Zn2(DOBDC)(以下、MOF-74(Zn)と記載する)
Mg2(DOBDC)(以下、MOF-74(Mg)と記載する)
Al(OH)(1,4-NDC)
Cr3F(H2O)2O(BDC)3(以下、MIL-101(Cr)と記載する)
Al8(OH)12{(OH)3(H2O)3}[BTC]3(以下、MIL-110(Al)と記載する)
Cu3(BTC)2(以下、HKUST-1と記載する)
Zr(BDC)2(以下、UiO-66と記載する)
Zr(BPDC)2(以下、UiO-67と記載する)
Zr(TPDC)2(以下、UiO-68と記載する)
などが挙げられる。
HMeIM:2-メチルイミダゾール
H2BDC:1,4-ベンゼンジカルボン酸
H4DOBDC:2,5-ジヒドロキシテレフタル酸
H2NDC:1,4-ナフタレンジカルボン酸
H3BTC:1,3,5-ベンゼントリカルボン酸
H2BPDC:4,4’-ビフェニルジカルボン酸
H2TPDC:4,4’’-p-テルフェニルジカルボン酸
を表わす。
例えば、1,4-ベンゼンジカルボン酸、2,5-ジヒドロキシテレフタル酸、1,4-ナフタレンジカルボン酸、1,3,5-ベンゼントリカルボン酸などは、分子中にRCOO-の構造を有する硬い塩基である。そのため、これらの化合物と硬い酸である金属イオン(例えば、Al3+、Cr3+、Mg2+、Fe3+、Zr4+など)とから得られる多孔性配位高分子は、イオン液体に対して優れた耐性を有する。このような多孔性配位高分子としては、具体的には、金属イオンがAl3+のMIL-53(Al)、Al(OH)(1,4-NDC)、金属イオンがCr3+のMIL-53(Cr)、MIL-101(Cr)、金属イオンがMg2+のMOF-74(Mg)、金属イオンがFe3+のMIL-53(Fe)、金属イオンがZr4+のUiO-66、UiO-67、UiO-68などが挙げられる。
例えば、イミダゾールは中間的な硬さを有する塩基である。したがって、イミダゾール系配位子と中間的な硬さを有する酸である金属イオンとから得られる多孔性配位高分子は、イオン液体に対して優れた耐性を有する。例えば、Fe2+、Co2+、またはZn2+からなるZIF(Zeolitic Imidazolate Frameworks)系の多孔性配位高分子はすべて該当し、代表的なものはZIF-8である。
逆に、配位不飽和サイトを有するMIL-101(Cr)、MOF-74(Mg)、MOF-74(Zn)、HKUST-1、UiO-66、UiO-67、およびUiO-68は、イオン液体に対する耐性が若干低くなる。
UiO-66、UiO-67、およびUiO-68は、各Zr4+は8個の酸素原子と配位結合している。8個のうち4個は有機配位子の酸素原子であり、2個はO2-に由来する酸素原子であり、残りの2個はOH-に由来する酸素原子である。このような多孔性配位高分子を、例えば真空引きしながら加熱することによって、各Zr4+に配位している酸素原子が、有機配位子の4個の酸素原子とO2-に由来する3個の酸素原子に変化する。その結果、配位不飽和サイトが1個形成される。
細孔内のイオン液体を除去し、真空引きしながら加熱などを行うことによって、配位不飽和サイトが形成されたか否かは、赤外分光法、元素分析などによって確認することができる。
反応は、原料の変質を防ぐため、不活性ガス雰囲気中で行ってもよい。反応後、洗浄および乾燥して反応溶剤を除去することにより、多孔性配位高分子の粉末または膜を得ることができる。
多孔性配位高分子が形成されているか否かは、得られた多孔性配位高分子の粉末X線回折(XRD)測定を行い、得られた回折パターンを解析することで確認できる。
これは、イオン液体2を保持する細孔1aの大きさがマイクロ孔の領域になると、細孔1a内に存在できるイオン対の数は、細孔1aの直径方向に10対(つい)オーダー以下にまで減少することに起因する。イオン液体2は凝固するときに、イオン液体2を構成するカチオンとアニオンとが水素結合によって規則的に配列する必要がある。しかし、細孔1aの大きさがマイクロ孔の領域になると、細孔1a内に存在するイオンの数が極端に少なくなる。そのため、イオンが極性の異なる他のイオンを容易に見つけられず、イオン対の形成、さらにはイオン液体の凝固が困難になる。その結果、イオン液体2の融点が、大幅に低下すると考えられる。
細孔の大きさが膨張あるいは収縮する性質を有する多孔性配位高分子としては、例えばMIL-53(Al)などが挙げられる。
細孔1aの形状は1次元、2次元および3次元のいずれでもよいが、3次元であることが特に好ましい。細孔1aの形状が3次元であると、イオン伝導のパスが最も確実に構築される。すなわち、イオン伝導のパスが等方的に形成されるとともに相互接続が容易になり、イオン伝導率が高くなるからである。
これらのイオン液体2は、単独で用いてもよく、2種以上を併用してもよい。電池の電解質としては、リチウム塩、ナトリウム塩を溶解させたものが特に好適に用いられる。
細孔1aの内部に吸着した分子やイオンを除去する方法としては、例えば、構造体1を洗浄液で洗浄し、細孔1aの内部に吸着した分子やイオンを洗い流す方法や、高温での加熱処理、真空加熱処理などによって吸着した分子やイオンを脱離させる方法がある。洗浄液としては水、メタノール、エタノール、ジメチルホルムアミドなどが好適に用いられる。洗浄後は、洗浄液が細孔1aの内部に残存しないように、構造体1を加熱処理や真空処理、真空加熱処理などに供して、洗浄液を除去することが好ましい。
複合体3を含むイオン伝導性膜は、イオン液体2に複合体1の粒子を分散させたスラリーを、周知の塗布法やテープ成形法などにより膜状やシート状に成形することでも作製できる。余剰のイオン液体は、膜状の構造体1の場合と同様に、水、メタノールなどの溶剤を用いて洗浄、ろ紙を押し当てて吸収するなどして除去すればよい。
あるいは、構造体1の細孔1aの容積に対してイオン液体2が過剰に存在する場合は、イオン液体2単独の場合と同じ融点を示すこともある。このような場合には、複合体3を、固体核磁気共鳴(NMR)分析法、交流インピーダンス法などの手法で測定温度を変えながら評価し、イオン液体2単独の場合の融点よりも低温における相転移挙動の有無を確認することで、構造体1の細孔1a内にイオン液体2が存在するか否かを判断できる。
なお、使用する多孔性配位高分子やイオン液体の種類および組成は、元素分析、X線回折(XRD)測定、核磁気共鳴(NMR)分析などにより特定すればよい。
構造体11は、多孔性配位高分子からなる複数の粒子111を圧縮成形して得られた成形体である。このような構造体11を用いて得られる複合体131は、電池や電気二重層キャパシタの電解質として用いられた場合、構造体11が緻密な構造を有するため、粒子間のイオン伝導パスがつながりやすくなる。したがって、このような複合体131は、イオンの良伝導体となる。
イオン伝導性物質5としては、たとえば水、有機電解液、イオン液体、イオン伝導性高分子などが挙げられる。これらの中でも、イオン伝導性が高く蒸気圧が低い点から、イオン液体を用いることが好ましい。蒸気圧が低いイオン液体は、通常の有機電解液と異なり、蒸発によって失われることがない。特に、構造体11の細孔内に保持されているイオン液体12と同一の物質(イオン液体)を用いた場合には、複合体132の粒子内外のイオン伝導がよりスムーズになり好ましい。
このようにして得られた構造体11の細孔に、イオン液体12が注入される。なお、注入方法は、上述の通りである。また、イオン伝導性物質5を用いる場合は、通常、イオン液体12の注入後に、粒子111間の空隙にイオン伝導性物質5が注入される。例えば、イオン伝導性物質5は、多孔性配位高分子の粒子111と固体(粉末)のイオン伝導性物質5とを混合したり、液状のイオン伝導性物質5を溶剤として使用したりして、粒子111間の空隙に存在させてもよい。
有機配位子供給源としてH2NDC、金属イオン供給源としてAl(NO3)3・9H2O、および反応溶媒としてイオン交換水を用いた。10mLのイオン交換水に、0.5mmolのH2NDCおよび1.0mmolのAl(NO3)3・9H2Oを加えて撹拌した。次いで、得られた混合物を耐圧容器に封入し、180℃で18時間保持してAl(OH)(1,4-NDC)粒子を得た。次いで、吸引ろ過によりAl(OH)(1,4-NDC)粒子を分離し、イオン交換水を用いて洗浄、吸引ろ過を行い室温で1時間乾燥させることにより、Al(OH)(1,4-NDC)粉末を得た。
有機配位子供給源としてH4DOBDC、金属イオン供給源としてZn(NO3)2・6H2O、および反応溶媒としてDMFと2-プロパノールと水との混合溶媒を用いた。2mLのDMFと0.1mLの2-プロパノールと0.1mLのイオン交換水との混合溶媒に、0.096mmolのH4DOBDCおよび0.20mmolのZn(NO3)2・6H2Oを撹拌した。次いで、得られた混合物を耐圧容器に封入し、105℃で20時間保持してMOF-74(Zn)粒子を得た。次いで、吸引ろ過によりMOF-74(Zn)粒子を分離し、DMFとエタノールとを用いて順次洗浄、吸引ろ過を行い室温で1時間乾燥させることにより、MOF-74(Zn)粉末を得た。
得られた複合体について、X線回折(XRD)測定を行い、多孔性配位高分子の回折ピークが確認できたものを○、確認できなかったものを×と評価した。結果を表1に示す。
AのDSCパターンでは、吸熱ピークが84℃付近に現れており、EMI-Cl単独の融点は84℃程度である。一方、BのDSCパターンには、-150~100℃の範囲で、融解または凝固に相当するピークが全く出現せず、試料No.8の複合体は、この温度範囲に融点および凝固点を有さないことがわかる。これは、84℃の融点を有するEMI-Cl単体は存在せず、EMI-Clは全てZIF-8の細孔内に存在し、融点が-150℃よりも低くなった、すなわち融点が234℃以上低下したためと考えられる。非特許文献1によれば、例えば直径が1.2nmの細孔を有するZIF-8にイオン液体を注入した場合、融点の低下は、140~187℃程度と予想されるが、本実施例ではそれよりも50℃以上低い融点を示したことになる。
また、CのDSCパターンからは、試料No.7の複合体の場合、融点が78℃とEMI-Cl単独の場合とほとんど変化していないことがわかる。これは、ZIF-8細孔内に存在するEMI-Clの融点は-150℃より低いためBと同様に観測されず、ZIF-8の細孔内に浸入できなかった余剰のEMI-Clの融点が、78℃に観測されたものと考えられる。
試料No.19において、20℃および41℃の2つの融点が記載されているのは、DSCパターンにおいて20℃および41℃付近の2ヶ所にピークが出現したためである。これは、構造体(MIL-53(Al))中におけるイオン液体(EMI-TFSI)の充填率にバラツキがあり、凝固したイオン液体の結晶構造が2種類存在するため(すなわち、2種類の複合体が存在するため)と推察される。
一方、図10中BはZIF-8とEMI-TFSIとの複合体のイオン伝導度である。ZIF-8を真空乾燥してゲスト分子を除去した後に、ZIF-8:EMI-TFSI=2.7:1(質量比)で混合して混合物を得た。得られた混合物を200℃で15時間加熱し、この粉末を直径3mm、厚さ0.5mmにプレス成型して試料を調製した。この試料のイオン伝導度は、19F NMRスペクトルの半値幅と同様に、温度とともに連続的な変化を見せており、低温でのイオン伝導度の低下はEMI-TFSI単独の場合よりも小さい。すなわち、ZIF-8とEMI-TFSIの複合体は、低温でも動作する有望なイオン伝導体である。
電極としては、活物質を含有する電極、たとえば金属酸化物、複合酸化物などの活物質の焼結体、活物質を導電剤とともに結着材で固めたもの、金属、炭素系材料などを用いればよい。電極と複合体とは、電解液などを介して接触していてもよいが、直接接触させれば、電極と複合体内部のイオン液体(またはイオン伝導性物質)との間で直接イオンの授受が可能となるため好ましい。
外装体としては、一般に用いられる形態、材料のものを用いればよいが、絶縁樹脂などで被覆するだけでも構わない。
例えば、上記試料No.18で得られた複合体におけるイオン液体の融点は56℃であり、用いたイオン液体(EMI-TFSI)単体の融点は-17℃である。リチウム塩を溶解したイオン液体の中に、MIL-53(Al)粉末を入れて65℃程度を維持すると、MIL-53(Al)の細孔内にリチウムイオンが入ったときのみ、細孔内のイオン液体が凝固する(リチウム塩を多量に溶解すると、イオン液体の融点は上昇するため)。したがって、MIL-53(Al)の細孔内にリチウムイオン濃度が高められたイオン液体を充填することができる。
Claims (11)
- 多孔性配位高分子からなる絶縁性の構造体と、前記多孔性配位高分子の細孔内に保持されたイオン液体とを有する、多孔性配位高分子-イオン液体複合体。
- 前記多孔性配位高分子が、ルイス酸である金属イオンとルイス塩基である有機配位子とを含み、前記ルイス酸および前記ルイス塩基が、HSAB則における硬い酸および硬い塩基の組合せ、柔らかい酸および柔らかい塩基の組合せ、ならびに中間的な硬さの酸と中間的な硬さの塩基の組合せのいずれかである、請求項1に記載の多孔性配位高分子-イオン液体複合体。
- 前記多孔性配位高分子が、配位不飽和サイトを有していない、請求項1または2に記載の多孔性配位高分子-イオン液体複合体。
- 前記多孔性配位高分子が、主鎖に典型金属元素を含む、請求項1~3のいずれかに記載の多孔性配位高分子-イオン液体複合体。
- 前記典型金属元素が、ZnまたはAlである、請求項4に記載の多孔性配位高分子-イオン液体複合体。
- 前記構造体が、膜状である、請求項1~5のいずれかに記載の多孔性配位高分子-イオン液体複合体。
- 前記構造体が、粒子状である、請求項1~5のいずれかに記載の多孔性配位高分子-イオン液体複合体。
- 前記構造体が、前記多孔性配位高分子からなる複数の粒子によって構成された成形体である、請求項1~5のいずれかに記載の多孔性配位高分子-イオン液体複合体。
- 前記成形体が、前記粒子間に設けられた複数の空隙を有し、該複数の空隙のうち少なくとも一部の空隙に、イオン伝導性物質を有している、請求項8に記載の多孔性配位高分子-イオン液体複合体。
- 前記イオン伝導性物質が、イオン液体である、請求項9に記載の多孔性配位高分子-イオン液体複合体。
- 前記イオン伝導性物質が、前記細孔内に保持されているイオン液体と同一のイオン液体である、請求項9または10に記載の多孔性配位高分子-イオン液体複合体。
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