WO2022138108A1 - 電極スラリー用カーボンナノチューブ分散液、負極スラリー、非水電解質二次電池、及び、電極スラリー用カーボンナノチューブ分散液の製造方法 - Google Patents
電極スラリー用カーボンナノチューブ分散液、負極スラリー、非水電解質二次電池、及び、電極スラリー用カーボンナノチューブ分散液の製造方法 Download PDFInfo
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- WO2022138108A1 WO2022138108A1 PCT/JP2021/044718 JP2021044718W WO2022138108A1 WO 2022138108 A1 WO2022138108 A1 WO 2022138108A1 JP 2021044718 W JP2021044718 W JP 2021044718W WO 2022138108 A1 WO2022138108 A1 WO 2022138108A1
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- electrode slurry
- carbon nanotube
- dispersion liquid
- nanotube dispersion
- negative electrode
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 142
- 239000002041 carbon nanotube Substances 0.000 title claims abstract description 103
- 229910021393 carbon nanotube Inorganic materials 0.000 title claims abstract description 102
- 239000006185 dispersion Substances 0.000 title claims abstract description 87
- 239000011267 electrode slurry Substances 0.000 title claims abstract description 85
- 239000007788 liquid Substances 0.000 title claims abstract description 56
- 239000011255 nonaqueous electrolyte Substances 0.000 title claims description 16
- 238000004519 manufacturing process Methods 0.000 title claims description 9
- 239000002245 particle Substances 0.000 claims abstract description 34
- 238000009826 distribution Methods 0.000 claims abstract description 27
- 239000002270 dispersing agent Substances 0.000 claims abstract description 15
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- 238000007561 laser diffraction method Methods 0.000 claims abstract description 8
- 238000001069 Raman spectroscopy Methods 0.000 claims abstract description 7
- 238000001228 spectrum Methods 0.000 claims abstract description 6
- 239000011259 mixed solution Substances 0.000 claims description 15
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- 229910052799 carbon Inorganic materials 0.000 claims description 4
- 239000011871 silicon-based negative electrode active material Substances 0.000 claims description 2
- 239000002109 single walled nanotube Substances 0.000 description 58
- 239000000203 mixture Substances 0.000 description 26
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- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 description 6
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- 239000002033 PVDF binder Substances 0.000 description 5
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- 230000006866 deterioration Effects 0.000 description 3
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- 150000003839 salts Chemical class 0.000 description 3
- 229910052723 transition metal Inorganic materials 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- KMTRUDSVKNLOMY-UHFFFAOYSA-N Ethylene carbonate Chemical compound O=C1OCCO1 KMTRUDSVKNLOMY-UHFFFAOYSA-N 0.000 description 2
- 229910013870 LiPF 6 Inorganic materials 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 2
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 2
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- 238000007607 die coating method Methods 0.000 description 2
- JBTWLSYIZRCDFO-UHFFFAOYSA-N ethyl methyl carbonate Chemical compound CCOC(=O)OC JBTWLSYIZRCDFO-UHFFFAOYSA-N 0.000 description 2
- 229910052748 manganese Inorganic materials 0.000 description 2
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- 229910018185 Al—Co Inorganic materials 0.000 description 1
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 description 1
- 238000012935 Averaging Methods 0.000 description 1
- IMROMDMJAWUWLK-UHFFFAOYSA-N Ethenol Chemical group OC=C IMROMDMJAWUWLK-UHFFFAOYSA-N 0.000 description 1
- PXGOKWXKJXAPGV-UHFFFAOYSA-N Fluorine Chemical compound FF PXGOKWXKJXAPGV-UHFFFAOYSA-N 0.000 description 1
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- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
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- 229920002125 Sokalan® Polymers 0.000 description 1
- DPXJVFZANSGRMM-UHFFFAOYSA-N acetic acid;2,3,4,5,6-pentahydroxyhexanal;sodium Chemical class [Na].CC(O)=O.OCC(O)C(O)C(O)C(O)C=O DPXJVFZANSGRMM-UHFFFAOYSA-N 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
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- VRAIHTAYLFXSJJ-UHFFFAOYSA-N alumane Chemical compound [AlH3].[AlH3] VRAIHTAYLFXSJJ-UHFFFAOYSA-N 0.000 description 1
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- 125000000129 anionic group Chemical group 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 229910052796 boron Inorganic materials 0.000 description 1
- 239000002388 carbon-based active material Substances 0.000 description 1
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- 125000002091 cationic group Chemical group 0.000 description 1
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- 238000010586 diagram Methods 0.000 description 1
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- IEJIGPNLZYLLBP-UHFFFAOYSA-N dimethyl carbonate Chemical compound COC(=O)OC IEJIGPNLZYLLBP-UHFFFAOYSA-N 0.000 description 1
- ALKZAGKDWUSJED-UHFFFAOYSA-N dinuclear copper ion Chemical compound [Cu].[Cu] ALKZAGKDWUSJED-UHFFFAOYSA-N 0.000 description 1
- 239000012153 distilled water Substances 0.000 description 1
- 150000002148 esters Chemical class 0.000 description 1
- 150000002170 ethers Chemical class 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- JEGUKCSWCFPDGT-UHFFFAOYSA-N h2o hydrate Chemical compound O.O JEGUKCSWCFPDGT-UHFFFAOYSA-N 0.000 description 1
- 125000005843 halogen group Chemical group 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052738 indium Inorganic materials 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000003273 ketjen black Substances 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- PAZHGORSDKKUPI-UHFFFAOYSA-N lithium metasilicate Chemical compound [Li+].[Li+].[O-][Si]([O-])=O PAZHGORSDKKUPI-UHFFFAOYSA-N 0.000 description 1
- 229910003002 lithium salt Inorganic materials 0.000 description 1
- 159000000002 lithium salts Chemical class 0.000 description 1
- 229910052912 lithium silicate Inorganic materials 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000002931 mesocarbon microbead Substances 0.000 description 1
- 239000011325 microbead Substances 0.000 description 1
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- 229910052718 tin Inorganic materials 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 238000001132 ultrasonic dispersion Methods 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
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Images
Classifications
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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
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
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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
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
- H01M4/624—Electric conductive fillers
- H01M4/625—Carbon or graphite
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y30/00—Nanotechnology for materials or surface science, e.g. nanocomposites
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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
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
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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
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/134—Electrodes based on metals, Si or alloys
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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
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/139—Processes of manufacture
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- H—ELECTRICITY
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- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/139—Processes of manufacture
- H01M4/1393—Processes of manufacture of electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx
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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
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/139—Processes of manufacture
- H01M4/1395—Processes of manufacture of electrodes based on metals, Si or alloys
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- H—ELECTRICITY
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- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/38—Selection of substances as active materials, active masses, active liquids of elements or alloys
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- H—ELECTRICITY
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- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/58—Selection of substances as active materials, active masses, active liquids of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy; of polyanionic structures, e.g. phosphates, silicates or borates
- H01M4/583—Carbonaceous material, e.g. graphite-intercalation compounds or CFx
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- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
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- H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
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- H—ELECTRICITY
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- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
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- H01M4/02—Electrodes composed of, or comprising, active material
- H01M2004/026—Electrodes composed of, or comprising, active material characterised by the polarity
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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
Definitions
- the present disclosure relates to a method for producing a carbon nanotube dispersion liquid for an electrode slurry, a negative electrode slurry, a non-aqueous electrolyte secondary battery, and a carbon nanotube dispersion liquid for an electrode slurry.
- Carbon nanotubes are attracting attention as a conductive agent contained in the electrodes of non-aqueous electrolyte secondary batteries. Carbon nanotubes can greatly improve conductivity with a smaller content than conventional conductive agents such as acetylene black. However, since carbon nanotubes tend to aggregate, there is a problem in dispersibility.
- Patent Document 1 describes carbon nanotubes having a G / D ratio of 0.5 to 5 indicating crystallinity and a half-value width of 2 ° to 6 ° in powder X-ray diffraction, and a vinyl alcohol skeleton-containing resin. A carbon nanotube dispersion liquid for an electrode slurry containing the same is disclosed. Further, Patent Document 1 describes that an electrode film (electrode mixture layer) produced by using this carbon nanotube dispersion liquid for an electrode slurry is excellent in conductivity and adhesion.
- the carbon nanotube dispersion liquid for electrode slurry described in Patent Document 1 has a low G / D ratio of carbon nanotubes contained therein, and the frequency distribution is not taken into consideration, so that there is still room for improvement in charge / discharge cycle characteristics. ..
- the carbon nanotube dispersion liquid for an electrode slurry which is one aspect of the present disclosure, contains carbon nanotubes having a diameter of 0.4 to 2 nm, a dispersant, and a dispersion medium, and the carbon nanotubes are G-Band in the Raman spectroscopic spectrum.
- the G / D ratio which is the ratio of the peak intensities of (1560-1600 cm -1 ) and D-Band (1310-1350 cm -1 ), is in the range of 50 to 200, and in the volume-based particle size distribution by the laser diffraction method.
- Carbon nanotubes have 3 to 5 peaks, and when the peaks are P 1 , P 2 , ... P n from the small particle size side, the maximum frequency peak is in the range of P 2 to P n-1 . It is characterized by being.
- the negative electrode slurry which is one form of the present disclosure, is characterized by containing the above-mentioned carbon nanotube dispersion liquid for an electrode slurry, a carbon-based negative electrode active material, and a Si-containing negative electrode active material.
- the non-aqueous electrolyte secondary battery which is one embodiment of the present disclosure, is characterized by including a negative electrode manufactured by using the above negative electrode slurry.
- the method for producing a carbon nanotube dispersion for an electrode slurry which is one embodiment of the present disclosure, has a diameter of 0.4 to 2 nm, and has G-Band (1560-1600 cm -1 ) and D-Band in a Raman spectroscopic spectrum.
- the mixed solution has 3 to 5 peaks of carbon nanotubes in the volume-based particle size distribution by the laser diffraction method, and the peaks are P 1 , P 2 , ... P n from the small particle size side.
- it is characterized by including a dispersion step of dispersing the carbon nanotubes in the mixed solution so that the maximum frequency peak is in the range of P 2 to P n-1 .
- the carbon nanotube dispersion liquid for electrode slurry according to the present disclosure it is possible to suppress the deterioration of the charge / discharge cycle characteristics of the battery.
- the carbon nanotubes are fibrous and can suppress the isolation of the active material due to charge / discharge as compared with the particulate conductive agent, the charge / discharge cycle characteristics can be improved.
- carbon nanotubes having a relatively high G / D ratio of 50 to 200 and good crystallinity have good conductivity. By making such carbon nanotubes have a predetermined particle size distribution while maintaining a good fibrous state, isolation of the active material can be suppressed.
- a carbon nanotube dispersion liquid for an electrode slurry a negative electrode slurry containing the carbon nanotube dispersion liquid for the electrode slurry, a non-aqueous electrolyte secondary battery provided with a negative electrode manufactured by using the negative electrode slurry, and an electrode are described below.
- An embodiment of a method for producing a carbon nanotube dispersion liquid for a slurry will be described in detail.
- the embodiments described below are merely examples, and the present disclosure is not limited to the following embodiments.
- the drawings referred to in the description of the embodiment are schematically described, and the dimensional ratios of the components drawn in the drawings should be determined in consideration of the following description.
- the non-aqueous electrolyte secondary battery according to the present disclosure is, for example, a lithium ion secondary battery.
- the battery case of the non-aqueous electrolyte secondary battery may be made of a metal such as a circle, a square, or a coin, or may be made of a laminated sheet including a metal layer and a resin layer.
- the non-aqueous electrolyte secondary battery contains, for example, an electrode body and a non-aqueous electrolyte in a battery case.
- the electrode body may be a wound type in which a positive electrode and a negative electrode are wound via a separator, or a laminated type in which a plurality of positive electrodes and a plurality of negative electrodes are alternately laminated one by one via a separator. It may be.
- the non-aqueous electrolyte contains a non-aqueous solvent and an electrolyte salt dissolved in the non-aqueous solvent.
- the non-aqueous solvent for example, esters, ethers, nitriles, amides, and a mixed solvent of two or more of these can be used.
- the non-aqueous solvent may contain a halogen-substituted product in which at least a part of hydrogen in these solvents is substituted with a halogen atom such as fluorine.
- a halogen atom such as fluorine.
- the electrolyte salt for example, a lithium salt such as LiPF 6 is used.
- FIG. 1 is a cross-sectional view of an electrode produced by using an electrode slurry containing a carbon nanotube dispersion liquid for an electrode slurry, which is an example of an embodiment.
- the electrode 10 includes a core material 11 and an electrode mixture layer 12 laminated on the surface of the core material 11. As shown in FIG. 1, the electrode 10 may be provided with an electrode mixture layer 12 on both surfaces of the core material 11.
- the electrode 10 may be a long electrode constituting a wound electrode body, or may be a rectangular electrode constituting a laminated electrode body.
- the electrode 10 can be applied to the positive electrode, the negative electrode, or both of the non-aqueous electrolyte secondary battery.
- the non-aqueous electrolyte secondary battery preferably includes a negative electrode prepared by using a negative electrode slurry containing a carbon nanotube dispersion liquid for an electrode slurry, which will be described later.
- a negative electrode prepared using a negative electrode slurry containing a carbon nanotube dispersion for an electrode slurry will be described as an example, but a positive electrode will be prepared using a positive electrode slurry containing a carbon nanotube dispersion for an electrode slurry. It is also good.
- the core material 11 a metal foil, a film having a metal layer formed on the surface, or the like can be used.
- the thickness of the core material 11 is, for example, 5 to 20 ⁇ m.
- a metal foil containing aluminum as a main component can be used for the core material 11.
- a metal foil containing copper as a main component can be used.
- the main component means a component having the highest mass ratio.
- the core material 11 may be a substantially 100% aluminum aluminum foil or a substantially 100% copper copper foil.
- the electrode mixture layer 12 contains, for example, an active material, carbon nanotubes (CNT), carboxymethyl cellulose (CMC), a binder and the like.
- the thickness of the electrode mixture layer 12 is, for example, 30 to 200 ⁇ m, preferably 50 to 150 ⁇ m.
- the electrode mixture layer 12 may contain a carbon material such as carbon black (CB), acetylene black (AB), or Ketjen black as a conductive agent other than carbon nanotubes.
- Examples of the positive electrode active material (positive electrode active material) contained in the electrode mixture layer 12 include a lithium transition metal composite oxide.
- the metal element contained in the lithium transition metal composite oxide include Ni, Co, Mn, Al, B, Mg, Ti, V, Cr, Fe, Cu, Zn, Ga, Sr, Zr, Nb, In and Sn. , Ta, W and the like. Above all, it is preferable to contain at least one of Ni, Co and Mn.
- Examples of the negative electrode active material (negative electrode active material) contained in the electrode mixture layer 12 include natural graphite such as scaly graphite, massive graphite, and earthy graphite, massive artificial graphite (MAG), and graphitized mesophase carbon microbeads.
- Examples thereof include carbon-based active materials such as artificial graphite such as (MCMB) and Si-based active materials that alloy with lithium.
- Examples of the Si-based active material include a Si-containing compound represented by SiO x (0.5 ⁇ x ⁇ 1.6) (hereinafter referred to as SiO), or Li 2y SiO (2 + y) (0 ⁇ y ⁇ 2).
- Examples thereof include Si-containing compounds (hereinafter referred to as LSX) in which fine particles of Si are dispersed in a lithium silicate phase represented by.
- the active material is the main component of the electrode mixture layer 12, and the content of the active material in the electrode mixture layer 12 is preferably 85 to 99% by mass, more preferably 90 to 99% by mass. ..
- Examples of the carbon nanotubes (CNTs) contained in the electrode mixture layer 12 include single-walled carbon nanotubes (SWCNTs) and multi-walled carbon nanotubes (MWCNTs).
- the CNT contained in the negative electrode mixture layer is preferably SWCNT, and may contain MWCNT.
- As the CNT contained in the positive electrode mixture layer CNT synthesized by a catalyst containing Co is preferable, and MWCNT is preferable among them.
- the positive electrode mixture layer may contain SWCNTs.
- the diameter of SWCNT is 0.4 to 2 nm.
- the length of the SWCNT is, for example, 0.1 to 200 ⁇ m.
- the diameter of the SWCNT is calculated from the average value of 10 CNTs measured by measuring the thickness of 10 CNTs using a transmission electron microscope (TEM).
- the length of SWCNTs is calculated by measuring the lengths of 10 CNTs using a scanning electron microscope (SEM) and averaging them.
- SWCNT has a G / D ratio in the range of 50 to 200, which is the ratio of the peak intensities of G-Band (1560-1600 cm -1 ) and D-Band (1310 to 1350 cm -1 ) in the Raman spectroscopic spectrum. .. SWCNTs with a high G / D ratio have high crystallinity.
- the Raman spectroscope for example, NRS-5500 manufactured by JASCO Corporation can be used.
- Carboxymethyl cellulose (CMC) contained in the electrode mixture layer 12 functions as a viscosity-adjusting thickener in the electrode slurry, as will be described later.
- CMC may also function as a binder.
- Examples of CMC include sodium carboxymethyl cellulose salt and ammonium carboxymethyl cellulose salt.
- binder other than CMC contained in the electrode mixture layer 12 examples include fluororesins such as polytetrafluoroethylene (PTFE) and polyvinylidene fluoride (PVdF), polyacrylonitrile (PAN), polyimides, acrylic resins, polyolefins, and styrene. Examples thereof include butadiene rubber (SBR) or a modified product thereof.
- PTFE polytetrafluoroethylene
- PVdF polyvinylidene fluoride
- PAN polyacrylonitrile
- SBR butadiene rubber
- the positive electrode mixture layer may contain, for example, PVdF
- the negative electrode mixture layer may contain, for example, SBR or a modified product thereof.
- an electrode slurry containing an active material, CNT, CMC, a binder and the like is applied onto the core material 11 and dried to form an electrode mixture layer 12, and then the electrode mixture layer 12 is rolled. It can be produced by doing so.
- the negative electrode slurry preferably contains a carbon nanotube dispersion liquid for an electrode slurry, which will be described later, a carbon-based negative electrode active material, and a Si-based negative electrode active material.
- the negative electrode slurry may further contain SBR or a modified product thereof.
- the carbon nanotube dispersion liquid for the electrode slurry contains a single-walled carbon nanotube (SWCNT), a dispersant, and a dispersion medium.
- the carbon nanotube dispersion liquid for the electrode slurry contains SWCNT having a predetermined characteristic and a predetermined particle size distribution, and a dispersant.
- the dispersion medium is, for example, water such as ion-exchanged water and distilled water.
- the SWCNT has a diameter of 0.4 to 2 nm and a G / D ratio in the range of 50 to 200.
- SWCNT has 3 to 5 peaks in the volume-based particle size distribution by the laser diffraction method, and when the peaks are P 1 , P 2 , ... P n from the small particle size side, the maximum frequency peak is It is in the range of P 2 to P n-1 .
- the particle size distribution indicates the dispersed state of SWCNTs.
- the particle size distribution measuring device for example, MT3000II manufactured by Microtrac Bell Co., Ltd. can be used.
- FIG. 2 is a diagram showing a particle size distribution of SWCNTs in a carbon nanotube dispersion liquid for an electrode slurry, which is an example of an embodiment.
- SWCNT has five peaks, and the second peak from the left is the maximum frequency peak. Therefore, in this case, it has 3 to 5 peaks, and when the peaks are P 1 , P 2 , ... P n from the small particle size side, the maximum frequency peak is P 2 to P n-1 .
- the maximum frequency peak among the peaks is not at both ends.
- the number of peaks is 3 or more, it indicates that the direction of contact of the SWCNT having a large aspect ratio of the laser irradiated from the particle size distribution measuring device is not uniform, indicating that the SWCNT remains fibrous. ing.
- the upper limit of the number of peaks is usually 5 in a preferable dispersed state.
- the maximum frequency peak is in the range of P 2 to P n-1 , it indicates that the fibrous SWCNTs are well dispersed.
- the maximum frequency peak is at the left end, it means that the SWCNT cutting progresses and there are many debris.
- the maximum frequency peak when the maximum frequency peak is at the right end, it means that the dispersion is insufficient or the dispersion becomes excessive and reaggregates. As described above, when the maximum frequency peak is in the range of P2 to Pn - 1 , the SWCNT is not in a good state, and the isolation of the active material cannot be suppressed.
- the content of SWCNTs in the carbon nanotube dispersion for the electrode slurry is preferably 0.1 to 1.5% by mass, more preferably 0.2 to 1.0% by mass, and 0.3 to 0. It is particularly preferable that the content is 5.5% by mass.
- the content of the dispersant in the carbon nanotube dispersion liquid for the electrode slurry is preferably 50 to 250 parts by mass, more preferably 100 to 200 parts by mass, and 120 to 180 parts by mass with respect to 100 parts by mass of SWCNT. Is particularly preferable.
- the dispersant examples include carboxymethyl cellulose (CMC), polyvinylpyrrolidone (PVP), and a surfactant, and the surfactant mainly includes anionic, cationic, nonionic, and amphoteric types.
- CMC carboxymethyl cellulose
- PVP polyvinylpyrrolidone
- surfactant mainly includes anionic, cationic, nonionic, and amphoteric types.
- the dispersant is preferably CMC.
- the CMC has, for example, a viscosity of 2 to 200 mPa ⁇ s in 100 s -1 of a 3% aqueous solution.
- the viscosity at 100s -1 can be determined by dissolving CMC in water to prepare a 3% aqueous solution and measuring the aqueous solution at 25 ° C. at 25 ° C. from 0.1 to 1000s -1 .
- As the rheometer for example, MCR102 manufactured by Anton Pearl Co., Ltd. can be used.
- the viscosity of the carbon nanotube dispersion liquid for electrode slurry which will be described later, can be measured in the same manner.
- the viscosity of the carbon nanotube dispersion liquid for electrode slurry at 100s -1 is 50 to 200 mPa ⁇ s, preferably 60 to 180 mPa ⁇ s, and preferably 70 to 150 mPa ⁇ s in a state where SWCNTs are dispersed. More preferred.
- a dispersant when the peaks have 3 to 5 peaks and the peaks are P 1 , P 2 , ... P n from the small particle size side, the maximum frequency peak is P.
- a dispersion step of dispersing SWCNTs in the mixed solution is included so as to be in the range of 2 to P n-1 .
- the length of the SWCNTs mixed in the mixing step is, for example, 0.1 to 200 ⁇ m.
- a mixed liquid is prepared while adsorbing the dispersant on SWCNT.
- adsorbing the dispersant to SWCNT By adsorbing the dispersant to SWCNT, reaggregation of SWCNT can be suppressed.
- the in-line mixer for example, a magic LAB manufactured by IKA can be used.
- Examples of the device used in the dispersion step include a high-pressure homogenizer, a bead mill, and an ultrasonic dispersion device. These devices can loosen and disperse the SWCNTs contained in the mixture. Since the high-pressure homogenizer can disperse and disperse SWCNTs more efficiently than a bead mill or an ultrasonic disperser, a high-pressure homogenizer is preferable as the device used in the dispersion step. As the high-pressure homogenizer, either a valve type or a nozzle type can be used, and a composite type of a nozzle type and a valve type can also be used.
- the nozzle-type high-pressure homogenizer for example, BERYU MINI manufactured by Bitsubu Co., Ltd. can be used.
- the dispersed state of SWCNT can be changed by adjusting the flow rate, pressure, nozzle diameter, and the like.
- FIG. 3 shows the dispersion step of the method for producing the carbon nanotube dispersion liquid for electrode slurry, which is an example of the embodiment, in the mixed liquid in the case where the treatment time is lengthened in the order of FIGS. 3 (a) to 3 (d). It is a figure which shows the change of the particle size distribution of SWCNT.
- the processing time may be changed depending on the specifications and setting conditions of the apparatus, but for example, the processing time can be lengthened by passing the mixed solution through the apparatus a plurality of times.
- FIG. 3A shows a case where the processing time is insufficient, and in this case, the number of peaks is less than three. In this case, it is considered that the dispersion of SWCNTs in the mixed solution is insufficient and many SWCNTs are aggregated.
- a shoulder is seen in the vicinity of the particle size of 3 ⁇ m, but in the present specification, the peak means that the frequency is maximum, and the shoulder does not have the maximum frequency. , Not the peak.
- the particle size distribution of SWCNT becomes the state of FIG. 3 (b), and when further treated, it becomes the state of FIG. 3 (c).
- the SWCNT particle size distribution shown in FIG. 3 (b) has five peaks, and the maximum frequency peak is the second from the left (P 2 ), not at both ends. Further, the particle size distribution of SWCNT shown in FIG. 3 (c) has four peaks, and the maximum frequency peak is the third from the left (P 3 ) and is not at both ends. Since both FIGS. 3 (b) and 3 (c) satisfy the predetermined conditions, the dispersed state of SWCNTs is good.
- the particle size distribution of SWCNT becomes the state of FIG. 3 (d).
- the SWCNT particle size distribution shown in FIG. 3D has four peaks, and the maximum frequency peak is at the right end. In this case, it is considered that SWCNTs are overdispersed and reaggregated.
- Example 1 [Preparation of carbon nanotube dispersion liquid for electrode slurry]
- Single-walled carbon nanotubes SWCNTs having a diameter of 1.6 nm, an average length of 15 ⁇ m, and a G / D ratio of 95 were used.
- the mixed solution is treated 10 times at a flow rate of 0.24 L / min and a pressure of 100 Pa using a nozzle-type high-pressure homogenizer (BERYU MINI manufactured by Bigrain Co., Ltd.) having a diamond nozzle having a nozzle diameter of 0.18 mm to treat the electrode slurry.
- a carbon nanotube dispersion liquid for use was prepared (dispersion step).
- the single-walled carbon nanotubes in the carbon nanotube dispersion for the electrode slurry had four peaks, and the maximum frequency peak was the second from the left (P2). ..
- Negative electrode active material Carbon nanotube dispersion liquid for electrode slurry: CMC: Lithium polyacrylic acid, styrene butadiene rubber (SBR) so that the mass ratio in solid content is 100: 0.02: 1: 1: 0.4. These were mixed with each other to prepare a negative electrode slurry.
- the negative electrode slurry was applied to both sides of the negative electrode core material made of copper foil by the die coating method, the coating film was dried, rolled by a rolling roller, and cut to a predetermined electrode size to prepare a negative electrode.
- the negative electrode was provided with an exposed negative electrode core material at one end in the width direction for connecting the negative electrode leads.
- NCA Ni—Al—Co
- NMP N-methyl-2-pyrrolidone
- the positive electrode is mixed with NMP so that the mass ratio of positive electrode active material: carbon nanotube dispersion for positive electrode slurry: polyvinylidene fluoride (PVdF) in solid content is 100: 0.4: 0.8, and the positive electrode is used.
- a slurry was prepared.
- the positive electrode slurry was applied to both sides of the positive electrode core material made of aluminum foil by the die coating method, the coating film was dried, rolled by a rolling roller, and cut to a predetermined electrode size to prepare a positive electrode. ..
- the positive electrode was provided with an exposed portion of the positive electrode core material for connecting the positive electrode lead at one end in the width direction.
- Ethylene carbonate (EC), ethylmethyl carbonate (EMC), and dimethyl carbonate (DMC) were mixed in a volume ratio of 3: 3: 4.
- a non-aqueous electrolyte was prepared by dissolving lithium hexafluorophosphate (LiPF 6 ) in the mixed solvent at a concentration of 1.2 mol / liter.
- a positive electrode lead is attached to the exposed portion of the positive electrode, and a negative electrode lead is attached to the exposed portion of the negative electrode.
- the positive electrode and the negative electrode are spirally wound via a polyolefin separator, and then press-molded in the radial direction to form a flat shape.
- a wound electrode body was produced. This electrode body was housed in an exterior body made of an aluminum laminated sheet, and after injecting the non-aqueous electrolyte, the opening of the exterior body was sealed to obtain a test cell (battery capacity: 400 mAh).
- Example 2 A test cell was prepared in the same manner as in Example 1 except that the number of treatments was changed to 20 in the dispersion step of preparing the carbon nanotube dispersion liquid for the electrode slurry, and measurement and evaluation were performed.
- Example 3 A test cell was prepared in the same manner as in Example 1 except that the number of treatments was changed to 30 in the dispersion step of preparing the carbon nanotube dispersion liquid for the electrode slurry, and measurement and evaluation were performed.
- Example 4 A test cell was prepared in the same manner as in Example 1 except that the number of treatments was changed to 40 in the dispersion step of preparing the carbon nanotube dispersion liquid for the electrode slurry, and measurement and evaluation were performed.
- Example 5 The test cell was prepared in the same manner as in Example 2 except that the SWCNT used in the mixing step of preparing the carbon nanotube dispersion liquid for the electrode slurry was changed to one having a diameter of 2 nm, an average length of 15 ⁇ m, and a G / D ratio of 50. It was prepared, measured and evaluated.
- Example 1 A test cell was prepared in the same manner as in Example 1 except that the number of treatments was changed to 3 in the dispersion step of preparing the carbon nanotube dispersion liquid for the electrode slurry, and measurement and evaluation were performed.
- Example 2 A test cell was prepared in the same manner as in Example 1 except that the number of treatments was changed to 5 in the dispersion step of preparing the carbon nanotube dispersion liquid for the electrode slurry, and measurement and evaluation were performed.
- Example 3 A test cell was prepared in the same manner as in Example 1 except that the number of treatments was changed to 60 in the dispersion step of preparing the carbon nanotube dispersion liquid for the electrode slurry, and measurement and evaluation were performed.
- Example 4 A test cell was prepared in the same manner as in Example 1 except that the number of treatments was changed to 100 in the dispersion step of preparing the carbon nanotube dispersion liquid for the electrode slurry, and measurement and evaluation were performed.
- Example 5 A test cell was prepared, measured and evaluated in the same manner as in Example 1 except that the nozzle diameter of the nozzle-type high-pressure homogenizer used in the dispersion step of preparing the carbon nanotube dispersion liquid for the electrode slurry was changed to 0.13 mm. rice field.
- Example 6 A test cell was prepared in the same manner as in Example 5 except that the number of treatments was changed to 5 in the dispersion step of preparing the carbon nanotube dispersion liquid for the electrode slurry, and measurement and evaluation were performed.
- Example 7 A test cell was prepared in the same manner as in Example 5 except that the number of treatments was changed to 40 in the dispersion step of preparing the carbon nanotube dispersion liquid for the electrode slurry, and measurement and evaluation were performed.
- Table 1 shows the evaluation results of the upper limit number of cycles in Examples and Comparative Examples.
- Table 1 shows the G / D ratio of SWCNTs contained in the carbon nanotube dispersion for electrode slurry, the nozzle diameter and number of treatments of the nozzle-type high-pressure homogenizer used in the dispersion step, and the SWCNTs in the carbon nanotube dispersion for electrode slurry. The number of peaks obtained from the particle size distribution and the maximum frequency peak position are also described.
- Each of the test cells of Examples 1 to 5 has a negative electrode prepared by using a carbon nanotube dispersion liquid for an electrode slurry that satisfies a predetermined condition. As a result, the test cells of Examples 1 to 5 can suppress the deterioration of the charge / discharge cycle characteristics of the battery as compared with the test cells of Comparative Examples 1 to 7.
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Abstract
Description
本開示に係る非水電解質二次電池は、例えば、リチウムイオン二次電池である。非水電解質二次電池の電池ケースは、円形、角形、コイン形等の金属で構成されていてもよく、金属層及び樹脂層を含むラミネートシートで構成されていてもよい。非水電解質二次電池は、電池ケースの中に、例えば、電極体と、非水電解質とを含んでいる。電極体は、正極と負極とがセパレータを介して巻回された巻回型であってもよいし、複数の正極と複数の負極がセパレータを介して交互に1枚ずつ積層されてなる積層型であってもよい。非水電解質は、非水溶媒と、非水溶媒に溶解した電解質塩とを含む。非水溶媒としては、例えば、エステル類、エーテル類、ニトリル類、アミド類、及びこれらの2種以上の混合溶媒を用いることができる。非水溶媒は、これら溶媒の水素の少なくとも一部をフッ素等のハロゲン原子で置換したハロゲン置換体を含有していてもよい。電解質塩には、例えば、LiPF6等のリチウム塩が用いられる。
電極スラリー用カーボンナノチューブ分散液は、単層カーボンナノチューブ(SWCNT)と、分散剤と、分散媒とを含む。当該電極スラリー用カーボンナノチューブ分散液は、後述するように、所定の特性及び所定の粒度分布を有するSWCNTと、分散剤とを含有する。これにより、合剤層中での活物質同士が導電剤であるSWCNTを介して導通し、電池の充放電サイクル特性の低下が抑制される。分散媒は、例えば、イオン交換水、蒸留水等の水である。
直径が0.4~2nmで、G/D比が50~200の範囲内であるSWCNTと、分散剤と、分散媒とを混合して混合液を作製する混合ステップと、混合液中のSWCNTが、レーザー回折法による体積基準の粒度分布において、3~5個のピークを有し、ピークを小粒径側からP1、P2、・・・Pnとしたとき、最大頻度ピークがP2~Pn-1の範囲にあるように、混合液中でSWCNTを分散させる分散ステップとを含む。混合ステップで混合するSWCNTの長さは、例えば、0.1~200μmである。
[電極スラリー用カーボンナノチューブ分散液の作製]
直径1.6nm、平均長さ15μm、G/D比が95の単層カーボンナノチューブ(SWCNT)を用いた。当該SWCNTと、3%水溶液の100s-1における粘度が6.7mPa・sであるカルボキシメチルセルロース(CMC)と、水とを0.4:0.4:99.2の質量比で、インラインミキサー(IKA社製のmagic LAB)を用いて混合して混合液を作製した(混合ステップ)。さらに、当該混合液を、ノズル径0.18mmのダイヤモンドノズルを有するノズル式高圧ホモジナイザー(美粒社製BERYU MINI)を用いて、流量0.24L/分、圧力100Paで10回処理して電極スラリー用カーボンナノチューブ分散液を作製した(分散ステップ)。レーザー回折法による体積基準の粒度分布において、当該電極スラリー用カーボンナノチューブ分散液中の単層カーボンナノチューブは、4個のピークを有し、最大頻度ピークは左から2番目(P2)であった。
黒鉛と、SiOと、LSXとを、95:3:2の質量比で混合したものを負極活物質として用いた。負極活物質:電極スラリー用カーボンナノチューブ分散液:CMC:ポリアクリル酸リチウム、スチレンブタジエンゴム(SBR)の固形分での質量比が、100:0.02:1:1:0.4となるようにこれらを混合して、負極スラリーを調製した。
負極スラリーを銅箔からなる負極芯材の両面にダイコート法により塗布し、塗膜を乾燥させた後、圧延ローラにより圧延し、所定の電極サイズに切断して、負極を作製した。なお、負極には、負極リードを接続するための負極芯材露出部を、幅方向一端部に設けた。
88質量%のNiを含有するNCA(Ni-Al-Co)系のリチウム遷移金属複合酸化物を正極活物質として用いた。多層カーボンナノチューブ(MWCNT)と、ポリビニルピロリドン(PVP)と、N-メチル-2-ピロリドン(NMP)とを含む正極スラリー用カーボンナノチューブ分散液を準備した。NMPに、正極活物質:正極スラリー用カーボンナノチューブ分散液:ポリフッ化ビニリデン(PVdF)の固形分での質量比が、100:0.4:0.8となるようにこれらを混合して、正極スラリーを調製した。次に、当該正極スラリーをアルミニウム箔からなる正極芯材の両面にダイコート法により塗布し、塗膜を乾燥させた後、圧延ローラにより圧延し、所定の電極サイズに切断して、正極を作製した。なお、正極には、正極リードを接続するための正極芯材露出部を、幅方向一端部に設けた。
エチレンカーボネート(EC)と、エチルメチルカーボネート(EMC)と、ジメチルカーボネート(DMC)とを、3:3:4の体積比で混合した。当該混合溶媒に対して、六フッ化リン酸リチウム(LiPF6)を1.2モル/リットルの濃度となるように溶解させて、非水電解質を調製した。
上記正極の露出部に正極リードを、上記負極の露出部に負極リードをそれぞれ取り付け、ポリオレフィン製のセパレータを介して正極と負極を渦巻き状に巻回した後、径方向にプレス成形して扁平状の巻回型電極体を作製した。この電極体をアルミラミネートシートで構成される外装体内に収容し、上記非水電解質を注入した後、外装体の開口部を封止して試験セル(電池容量:400mAh)を得た。
上記試験セルについて、下記サイクル試験を行なった。容量維持率が85%以下となるまで、当該サイクル試験を行い、容量維持率が85%以下となるサイクル数を上限サイクル数とした。
<サイクル試験>
試験セルを、25℃の温度環境下、0.5Cの定電流で電池電圧が4.2Vになるまで定電流充電を行い、4.2Vで電流値が0.05Cになるまで定電圧充電を行った後、0.7Cの定電流で電池電圧が2.5Vになるまで定電流放電を行い、これを1サイクルとした。1サイクル終わる毎に10分間の休止を挟みつつ、繰り返した。
電極スラリー用カーボンナノチューブ分散液の作製の分散ステップにおいて、処理回数を20回に変更したこと以外は、実施例1と同様にして試験セルを作製し、測定・評価を行った。
電極スラリー用カーボンナノチューブ分散液の作製の分散ステップにおいて、処理回数を30回に変更したこと以外は、実施例1と同様にして試験セルを作製し、測定・評価を行った。
電極スラリー用カーボンナノチューブ分散液の作製の分散ステップにおいて、処理回数を40回に変更したこと以外は、実施例1と同様にして試験セルを作製し、測定・評価を行った。
電極スラリー用カーボンナノチューブ分散液の作製の混合ステップにおいて用いるSWCNTを、直径2nm、平均長さ15μm、G/D比が50のものに変更したこと以外は、実施例2と同様にして試験セルを作製し、測定・評価を行った。
電極スラリー用カーボンナノチューブ分散液の作製の分散ステップにおいて、処理回数を3回に変更したこと以外は、実施例1と同様にして試験セルを作製し、測定・評価を行った。
電極スラリー用カーボンナノチューブ分散液の作製の分散ステップにおいて、処理回数を5回に変更したこと以外は、実施例1と同様にして試験セルを作製し、測定・評価を行った。
電極スラリー用カーボンナノチューブ分散液の作製の分散ステップにおいて、処理回数を60回に変更したこと以外は、実施例1と同様にして試験セルを作製し、測定・評価を行った。
電極スラリー用カーボンナノチューブ分散液の作製の分散ステップにおいて、処理回数を100回に変更したこと以外は、実施例1と同様にして試験セルを作製し、測定・評価を行った。
電極スラリー用カーボンナノチューブ分散液の作製の分散ステップにおいて用いるノズル式高圧ホモジナイザーのノズル径を0.13mmに変更したこと以外は、実施例1と同様にして試験セルを作製し、測定・評価を行った。
電極スラリー用カーボンナノチューブ分散液の作製の分散ステップにおいて、処理回数を5回に変更したこと以外は、実施例5と同様にして試験セルを作製し、測定・評価を行った。
電極スラリー用カーボンナノチューブ分散液の作製の分散ステップにおいて、処理回数を40回に変更したこと以外は、実施例5と同様にして試験セルを作製し、測定・評価を行った。
Claims (8)
- 直径が0.4~2nmのカーボンナノチューブと、
分散剤と、
分散媒とを含み、
前記カーボンナノチューブは、ラマン分光スペクトルにおいて、G-Band(1560~1600cm-1)とD-Band(1310~1350cm-1)のピーク強度の比率であるG/D比が、50~200の範囲内であり、
レーザー回折法による体積基準の粒度分布において、前記カーボンナノチューブが、3~5個のピークを有し、前記ピークを小粒径側からP1、P2、・・・Pnとしたとき、最大頻度ピークがP2~Pn-1の範囲にある、電極スラリー用カーボンナノチューブ分散液。 - 前記カーボンナノチューブの含有率は、0.1~1.5質量%である、請求項1に記載の電極スラリー用カーボンナノチューブ分散液。
- 前記分散剤の含有量は、前記カーボンナノチューブ100質量部に対して、50~250質量部である、請求項1又は2に記載の電極スラリー用カーボンナノチューブ分散液。
- 前記分散剤は、CMCである、請求項1~3のいずれか1項に記載の電極スラリー用カーボンナノチューブ分散液。
- 前記CMCは、3%水溶液の100s-1における粘度が2~200mPa・sである、請求項4に記載の電極スラリー用カーボンナノチューブ分散液。
- 請求項1~5のいずれか1項に記載の電極スラリー用カーボンナノチューブ分散液と、炭素系負極活物質と、Si系負極活物質とを含む負極スラリー。
- 請求項6に記載の負極スラリーを用いて作製した負極を備える、非水電解質二次電池。
- 直径が0.4~2nmであり、且つ、ラマン分光スペクトルにおいて、G-Band(1560~1600cm-1)とD-Band(1310~1350cm-1)のピーク強度の比率であるG/D比が、50~200の範囲内であるカーボンナノチューブと、
分散剤と、
分散媒とを混合して混合液を作製する混合ステップと、
レーザー回折法による体積基準の粒度分布において、前記混合液中の前記カーボンナノチューブが、3~5個のピークを有し、前記ピークを小粒径側からP1、P2、・・・Pnとしたとき、最大頻度ピークがP2~Pn-1の範囲にあるように、前記混合液中で前記カーボンナノチューブを分散させる分散ステップとを含む、電極スラリー用カーボンナノチューブ分散液の製造方法。
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CN202180084535.XA CN116601789A (zh) | 2020-12-23 | 2021-12-06 | 电极浆料用碳纳米管分散液、负极浆料、非水电解质二次电池、以及电极浆料用碳纳米管分散液的制造方法 |
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WO2017199884A1 (ja) * | 2016-05-17 | 2017-11-23 | 株式会社名城ナノカーボン | 電極構造体 |
JP2020011873A (ja) | 2018-07-20 | 2020-01-23 | 東洋インキScホールディングス株式会社 | カーボンナノチューブ分散液およびその利用 |
JP6801806B1 (ja) * | 2019-10-24 | 2020-12-16 | 東洋インキScホールディングス株式会社 | 非水電解質二次電池用カーボンナノチューブ分散液およびそれを用いた樹脂組成物、合材スラリー、電極膜、非水電解質二次電池。 |
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JP2011076948A (ja) * | 2009-09-30 | 2011-04-14 | Toray Ind Inc | 導電性複合体およびリチウムイオン電池用負極。 |
WO2017199884A1 (ja) * | 2016-05-17 | 2017-11-23 | 株式会社名城ナノカーボン | 電極構造体 |
JP2020011873A (ja) | 2018-07-20 | 2020-01-23 | 東洋インキScホールディングス株式会社 | カーボンナノチューブ分散液およびその利用 |
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