WO2022202701A1 - ポリイミド化合物、ならびにそれを用いたリチウムイオン二次電池用負極材料、リチウムイオン二次電池用負極およびリチウムイオン二次電池 - Google Patents
ポリイミド化合物、ならびにそれを用いたリチウムイオン二次電池用負極材料、リチウムイオン二次電池用負極およびリチウムイオン二次電池 Download PDFInfo
- Publication number
- WO2022202701A1 WO2022202701A1 PCT/JP2022/012788 JP2022012788W WO2022202701A1 WO 2022202701 A1 WO2022202701 A1 WO 2022202701A1 JP 2022012788 W JP2022012788 W JP 2022012788W WO 2022202701 A1 WO2022202701 A1 WO 2022202701A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- negative electrode
- ion secondary
- lithium ion
- group
- polyimide
- Prior art date
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- 229920001721 polyimide Polymers 0.000 title claims abstract description 59
- 239000004642 Polyimide Substances 0.000 title claims abstract description 58
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 44
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 44
- 239000007773 negative electrode material Substances 0.000 title claims description 60
- 150000001875 compounds Chemical class 0.000 title claims description 18
- -1 aromatic diamine compound Chemical class 0.000 claims abstract description 63
- 150000004985 diamines Chemical class 0.000 claims abstract description 15
- 239000007772 electrode material Substances 0.000 claims abstract description 7
- 150000008065 acid anhydrides Chemical class 0.000 claims description 14
- 125000003118 aryl group Chemical group 0.000 claims description 11
- 125000004435 hydrogen atom Chemical group [H]* 0.000 claims description 9
- 125000004432 carbon atom Chemical group C* 0.000 claims description 7
- 239000011871 silicon-based negative electrode active material Substances 0.000 claims description 7
- 239000011255 nonaqueous electrolyte Substances 0.000 claims description 6
- WPYMKLBDIGXBTP-UHFFFAOYSA-N benzoic acid Chemical compound OC(=O)C1=CC=CC=C1 WPYMKLBDIGXBTP-UHFFFAOYSA-N 0.000 claims description 5
- 125000001797 benzyl group Chemical group [H]C1=C([H])C([H])=C(C([H])=C1[H])C([H])([H])* 0.000 claims description 5
- 125000000051 benzyloxy group Chemical group [H]C1=C([H])C([H])=C(C([H])=C1[H])C([H])([H])O* 0.000 claims description 5
- 125000000951 phenoxy group Chemical group [H]C1=C([H])C([H])=C(O*)C([H])=C1[H] 0.000 claims description 5
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- LIVNPJMFVYWSIS-UHFFFAOYSA-N silicon monoxide Chemical compound [Si-]#[O+] LIVNPJMFVYWSIS-UHFFFAOYSA-N 0.000 description 18
- 238000000034 method Methods 0.000 description 15
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- 239000011230 binding agent Substances 0.000 description 11
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- LJMPOXUWPWEILS-UHFFFAOYSA-N 3a,4,4a,7a,8,8a-hexahydrofuro[3,4-f][2]benzofuran-1,3,5,7-tetrone Chemical compound C1C2C(=O)OC(=O)C2CC2C(=O)OC(=O)C21 LJMPOXUWPWEILS-UHFFFAOYSA-N 0.000 description 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
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- IAZDPXIOMUYVGZ-UHFFFAOYSA-N Dimethylsulphoxide Chemical compound CS(C)=O IAZDPXIOMUYVGZ-UHFFFAOYSA-N 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 4
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 4
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- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical compound C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 description 4
- 150000008064 anhydrides Chemical class 0.000 description 4
- 238000000576 coating method Methods 0.000 description 4
- 239000011889 copper foil Substances 0.000 description 4
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- 125000005843 halogen group Chemical group 0.000 description 4
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- 239000010703 silicon Substances 0.000 description 4
- 229910052710 silicon Inorganic materials 0.000 description 4
- HXJUTPCZVOIRIF-UHFFFAOYSA-N sulfolane Chemical compound O=S1(=O)CCCC1 HXJUTPCZVOIRIF-UHFFFAOYSA-N 0.000 description 4
- CYSGHNMQYZDMIA-UHFFFAOYSA-N 1,3-Dimethyl-2-imidazolidinon Chemical compound CN1CCN(C)C1=O CYSGHNMQYZDMIA-UHFFFAOYSA-N 0.000 description 3
- WNXJIVFYUVYPPR-UHFFFAOYSA-N 1,3-dioxolane Chemical compound C1COCO1 WNXJIVFYUVYPPR-UHFFFAOYSA-N 0.000 description 3
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- XTHFKEDIFFGKHM-UHFFFAOYSA-N Dimethoxyethane Chemical compound COCCOC XTHFKEDIFFGKHM-UHFFFAOYSA-N 0.000 description 3
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 3
- YLQBMQCUIZJEEH-UHFFFAOYSA-N Furan Chemical group C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 description 3
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 3
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- 239000002253 acid Substances 0.000 description 3
- JFDZBHWFFUWGJE-UHFFFAOYSA-N benzonitrile Chemical compound N#CC1=CC=CC=C1 JFDZBHWFFUWGJE-UHFFFAOYSA-N 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 125000001309 chloro group Chemical group Cl* 0.000 description 3
- 229920006026 co-polymeric resin Polymers 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 238000006297 dehydration reaction Methods 0.000 description 3
- 238000011156 evaluation Methods 0.000 description 3
- 239000011888 foil Substances 0.000 description 3
- 239000011521 glass Substances 0.000 description 3
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 description 3
- 239000007774 positive electrode material Substances 0.000 description 3
- 125000001424 substituent group Chemical group 0.000 description 3
- 238000003786 synthesis reaction Methods 0.000 description 3
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- 125000003944 tolyl group Chemical group 0.000 description 3
- BLTXWCKMNMYXEA-UHFFFAOYSA-N 1,1,2-trifluoro-2-(trifluoromethoxy)ethene Chemical compound FC(F)=C(F)OC(F)(F)F BLTXWCKMNMYXEA-UHFFFAOYSA-N 0.000 description 2
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Classifications
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- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
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- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
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- C08G73/1064—Polyimides containing other atoms than carbon, hydrogen, nitrogen or oxygen in the main chain containing sulfur
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
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- C08G73/1078—Partially aromatic polyimides wholly aromatic in the diamino moiety
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- C—CHEMISTRY; METALLURGY
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- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
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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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- 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
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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
- H01M4/136—Electrodes based on inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy
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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
- H01M4/36—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
- H01M4/386—Silicon or alloys based on silicon
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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
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/48—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides
- H01M4/483—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides for non-aqueous cells
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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
- H01M2004/026—Electrodes composed of, or comprising, active material characterised by the polarity
- H01M2004/027—Negative electrodes
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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
- H01M2004/026—Electrodes composed of, or comprising, active material characterised by the polarity
- H01M2004/028—Positive electrodes
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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 invention relates to polyimide used as an electrode material for lithium ion secondary batteries.
- a negative electrode active material contained in a lithium-ion secondary battery a silicon (Si)-based material is used because of its high discharge capacity, excellent initial charge-discharge efficiency and cycle characteristics.
- Si silicon expands and contracts during charging and discharging. Largely, repeated use may cause disconnection of the conductive path between the negative electrode active materials, separation between the current collector and the negative electrode active material layer, and the like.
- the present invention has been made in view of the above problems, and the problem to be solved is to provide a polyimide used as an electrode material that can significantly improve the cycle characteristics of a lithium ion secondary battery. That is.
- Another object of the present invention is to provide a negative electrode material for a lithium ion secondary battery containing the polyimide, a negative electrode made of the negative electrode material, and a lithium ion secondary battery including the negative electrode.
- the present inventors have found that by using a specific aromatic diamine as a diamine component, it is possible to suppress the expansion of the electrode even when a silicon-based negative electrode active material is used, and to significantly improve the cycle characteristics. I have learned that it can be improved.
- the present invention is based on such findings. That is, the gist of the present invention is as follows.
- the diamine component has the following formula (1): (In the formula, R 1 to R 4 are hydrogen atoms, Any one of R 5 to R 8 is an aromatic group having 6 to 10 carbon atoms, a phenoxy group, a benzyl group or a benzyloxy group, and the other R 5 to R 8 are hydrogen atoms. ) containing an aromatic diamine compound represented by the polyimide.
- R 1 to R 4 are hydrogen atoms
- Any one of R 5 to R 8 is an aromatic group having 6 to 10 carbon atoms, a phenoxy group, a benzyl group or a benzyloxy group, and the other R 5 to R 8 are hydrogen atoms.
- containing an aromatic diamine compound represented by the polyimide [2] The polyimide according to [1], wherein the acid anhydride component contains at least one of an alicyclic acid anhydride and an aromatic acid anhydride.
- a negative electrode material for a lithium ion secondary battery comprising the polyimide according to any one of [1] to [3] and a silicon-based negative electrode active material as a negative electrode active material.
- a silicon-based negative electrode active material is contained in a proportion of 30 parts by mass or more with respect to 100 parts by mass of the negative electrode active material.
- a negative electrode for a lithium ion secondary battery comprising a negative electrode current collector and a negative electrode active material layer formed on the negative electrode current collector, A negative electrode for a lithium ion secondary battery, wherein the negative electrode active material layer is made of the negative electrode material according to [4] or [5].
- a lithium ion secondary battery comprising the negative electrode according to [6], a positive electrode, and a non-aqueous electrolyte.
- the polyimide of the present invention as an electrode material for a lithium ion secondary battery, it is possible to suppress the expansion of the electrode and significantly improve the cycle characteristics even when a silicon-based negative electrode active material is used. can do.
- solvent-soluble means that 5 g or more dissolves in 100 g of an organic solvent.
- aromatic group includes substituents bonded to the main skeleton via an oxygen atom, a nitrogen atom or a carbon atom.
- aromatic groups include heteroaromatic groups such as pyrrole groups.
- the polyimide of the present invention is a reaction product of a diamine component containing an aromatic diamine compound represented by the following formula (1) and an acid anhydride component.
- R 1 to R 4 are hydrogen atoms
- Any one of R 5 to R 8 is an aromatic group having 6 to 10 carbon atoms, a phenoxy group, a benzyl group or a benzyloxy group, and the other R 5 to R 8 are hydrogen atoms.
- the aromatic group having 6 to 10 carbon atoms is preferably unsubstituted from the viewpoint of ease of synthesis and use in the field of electronic component materials, but may have a substituent, such as an alkyl group, Halogen groups such as fluoro groups and chloro groups, amino groups, nitro groups, hydroxyl groups, cyano groups, carboxyl groups, sulfonic acid groups and the like can be mentioned.
- the alkyl group and aromatic group may have one or more or two or more of these substituents.
- aromatic groups having 6 to 10 carbon atoms include phenyl group, tolyl group, methylphenyl group, dimethylphenyl group, ethylphenyl group, diethylphenyl group, propylphenyl group, butylphenyl group, fluorophenyl group, pentafluoro phenyl group, chlorophenyl group, bromophenyl group, methoxyphenyl group, dimethoxyphenyl group, ethoxyphenyl group, diethoxyphenyl group, aminophenyl group, nitrophenyl group, nitrobenzyl group, cyanophenyl group, cyanobenzyl group, phenethyl group , phenylpropyl group, phenylamino group, diphenylamino group, biphenyl group, naphthyl group, phenylnaphthyl group, diphenylnaphthyl group, anthryl group
- a phenyl group and a methylphenyl group are preferable from the standpoint of availability of starting materials and synthesis costs.
- two or more aromatic diamine compounds represented by the above formula (1) may be used in combination.
- a compound represented by the following formula (2) can be preferably used as the diamine compound satisfying the above formula (1).
- the aromatic diamine compound represented by the above formula (1) is obtained by reacting a compound represented by the following formula (3) with a compound represented by the following formula (4), and then reducing the nitro group.
- a compound represented by the following formula (3) is obtained by reacting a compound represented by the following formula (3) with a compound represented by the following formula (4), and then reducing the nitro group.
- R 1 ' to R 4 ' are hydrogen atoms
- any one of R 5 ' to R 8 ' is an aromatic group having 6 to 10 carbon atoms, a phenoxy group, a benzyl group or a benzyloxy group.
- other R 5 ' to R 8 ' are hydrogen atoms.
- X represents a hydroxyl group or a halogen group selected from a fluoro group, a chloro group, a bromo group and an iodo group. From the viewpoint of reactivity with the compound represented by the general formula (4), X is preferably a halogen group, particularly preferably a chloro group or a bromo group.
- the reaction of the compounds represented by the above formulas (3) and (4) can be performed using a dehydration condensation agent such as N,N'-dicyclohexylcarbodiimide (DCC) or P- It is preferably carried out in the presence of an organic acid catalyst such as toluenesulfonic acid.
- a dehydration condensation agent such as N,N'-dicyclohexylcarbodiimide (DCC) or P- It is preferably carried out in the presence of an organic acid catalyst such as toluenesulfonic acid.
- an organic acid catalyst such as toluenesulfonic acid.
- the reaction of the compounds represented by the above formulas (3) and (4) is preferably carried out in the presence of an acid acceptor such as triethylamine.
- the diamine compound represented by the above formula (2) can be obtained by reacting the compounds represented by the following formulas (5) and (6).
- the compound represented by the above formula (4) can be obtained by nitrating a commercially available or synthesized compound represented by the following formula (7).
- a mixed acid of concentrated sulfuric acid and concentrated nitric acid, nitric acid, fuming nitric acid, alkali metal salt of concentrated sulfuric acid, acetyl nitrate, nitronium salt, nitrogen oxide, etc. were used. It can be carried out by a conventionally known nitration method.
- R 5 '' to R 8 '' is an aromatic group having 6 to 10 carbon atoms, a phenoxy group, a benzyl group or a benzyloxy group, and the other R 5 '' to R 8 '' are It is a hydrogen atom.
- a diamine compound other than the aromatic diamine compounds described above may be included as a diamine component.
- examples include m-phenylenediamine, p-phenylenediamine, 2,4-diaminotoluene, 2,4(6)-diamino-3,5-diethyltoluene, 5(6)-amino-1,3,3-trimethyl -1-(4-aminophenyl)-indane, 4,4′-diamino-2,2′-dimethyl-1,1′-biphenyl, 4,4′-diamino-2,2′-ditrifluoromethyl-1 ,1′-biphenyl, 4,4′-diamino-3,3′-dimethyl-1,1′-biphenyl, 3,4′-diaminodiphenyl ether, 4,4′-diaminodiphenyl ether, 3,3′-diaminodiphenyl Sulf
- the entire diamine compound has the above formula
- the content of the aromatic diamine compound represented by (1) is preferably 20 mol % or more, more preferably 50 mol % or more.
- the acid anhydride constituting the polyimide of the present invention is not particularly limited, and various acid anhydrides used for polyimide can be used.
- various acid anhydrides used for polyimide can be used.
- alicyclic acid anhydrides and aromatic acid anhydrides are preferable from the viewpoint of increasing the ratio of the aromatic diamine compound represented by formula (1) in the diamine component of the polyimide. can be used for
- the polyimide of the present invention is obtained by reacting a diamine component containing an aromatic diamine compound represented by the above formula (1) with an acid anhydride component to obtain a polyamic acid, followed by a cyclization dehydration reaction to convert to a polyimide.
- a diamine component containing an aromatic diamine compound represented by the above formula (1) with an acid anhydride component to obtain a polyamic acid, followed by a cyclization dehydration reaction to convert to a polyimide.
- a cyclization dehydration reaction to convert to a polyimide.
- the mixing ratio of the diamine component and the acid anhydride component is preferably 0.5 mol% to 1.5 mol% of the total amount of the diamine component with respect to 1 mol% of the total amount of the acid anhydride, and 0.9 mol. % to 1.1 mol %.
- the reaction between the diamine component and the acid anhydride component is preferably carried out in an organic solvent.
- the organic solvent is not particularly limited as long as it does not react with the diamine compound and the acid anhydride and can dissolve the reaction product of the diamine compound and the acid anhydride.
- the reaction temperature between the diamine compound and the acid anhydride is preferably 40°C or less in the case of chemical imidization. In the case of thermal imidization, the temperature is preferably 150 to 220°C, more preferably 170 to 200°C.
- an imidization catalyst may be used, such as methylamine, ethylamine, trimethylamine, triethylamine, propylamine, tripropylamine, butylamine, tributylamine, tert-butylamine, hexylamine, triethanolamine, N,N-dimethylethanolamine, N,N-diethylethanolamine, triethylenediamine, N-methylpyrrolidine, N-ethylpyrrolidine, aniline, benzylamine, toluidine, trichloroaniline, pyridine, collidine, lutidine, picoline, quinoline, isoquinoline , valerolactone and the like can be used.
- an azeotropic dehydrating agent such as toluene, xylene or ethylcyclohexane, or an acid catalyst such as acetic anhydride, propionic anhydride, butyric anhydride or benzoic anhydride can be used.
- Sealing agents such as benzoic acid, phthalic anhydride, and hydrogenated phthalic anhydride can be used in the reaction between the diamine compound and the acid anhydride.
- polyimide compounds A double bond or triple bond can also be introduced at the terminus.
- the above-described polyimide of the present invention can be suitably used as a negative electrode material for lithium ion secondary batteries (hereinafter sometimes simply referred to as "negative electrode material”), especially as a binder component of the negative electrode. That is, it can be used as a negative electrode material containing the above polyimide as a binder and a negative electrode active material.
- the above polyimide may be used alone, or may contain other resins, for example, polyvinylidene fluoride (PVDF) can be used.
- PVDF polyvinylidene fluoride
- the binder instead of PVDF, for example, PVDF copolymer resin, fluorine resin, styrene-butadiene rubber (SBR), ethylene-propylene rubber (EPDM), styrene-acrylonitrile copolymer, etc. may be used. good.
- PVDF copolymer resin for example, a copolymer resin of hexafluoropropylene (HFP), perfluoromethyl vinyl ether (PFMV), or tetrafluoroethylene (TFE) and PVDF may be used.
- fluororesin for example, polytetrafluoroethylene (PTFE), fluororubber, or the like may be used.
- binders for example, polysaccharides such as carboxymethyl cellulose (CMC) and thermoplastic resins such as polyimide resins may be used.
- CMC carboxymethyl cellulose
- thermoplastic resins such as polyimide resins
- the content of polyimide in the negative electrode material is preferably 1% by mass or more and 20% by mass or less, and more preferably 3% by mass or more and 18% by mass or less.
- silicon-based material examples include silicon particles, alloys of silicon with metals such as tin, nickel, iron, copper, silver, cobalt, manganese, and zinc, and compounds of silicon with boron, nitrogen, oxygen, carbon, and the like. mentioned.
- silicon - based materials include Si, SiO, SiO2 , SiB4 , Mg2Si , Ni2Si , CoSi2, NiSi2 , Cu5Si , FeSi2, MnSi2 , ZnSi2 , SiC , and Si3N . 4 and Si 2 N 2 O, among which Si and SiO are preferred.
- negative electrode active material Materials other than silicon-based materials may be used as the negative electrode active material, such as metal lithium, metal oxides, and graphite. Moreover, two or more types of negative electrode active materials may be included as the negative electrode material.
- the silicon-based negative electrode active material described above is preferably contained in a proportion of 30 parts by mass or more, more preferably 50 parts by mass or more, particularly preferably 100 parts by mass of the negative electrode active material. It is 95 parts by mass or more.
- the negative electrode material may contain a conductive agent in addition to the polyimide and negative electrode active material described above.
- conductive agents include carbon black (acetylene black, ketjen black, furnace black, etc.), graphite, carbon fibers, carbon flakes, metal fibers and foils. Among these, carbon black is preferred, and acetylene black is more preferred.
- carbon black is preferred, and acetylene black is more preferred.
- One of these conductive agents may be used alone, or two or more thereof may be used in combination.
- the content of the conductive agent in the negative electrode material is preferably 0.1% by mass or more and 25% by mass or less, more preferably 1% by mass or more and 20% by mass or less, relative to the entire negative electrode material.
- a good conductive path can be formed in the negative electrode active material layer by setting the content of the conductive agent within the above numerical range.
- the negative electrode material can contain additives, such as thickeners and fillers, within the range that does not impair the characteristics of the present invention.
- a negative electrode for a lithium ion secondary battery of the present invention comprises a negative electrode current collector and a negative electrode active material layer formed on the negative electrode current collector, and the negative electrode active material layer is made of the above-described negative electrode material. be.
- the current collector is not particularly limited, and examples thereof include copper, nickel, stainless steel, gold, iron, aluminum and alloys thereof, nickel-plated steel, and chrome-plated steel.
- the thickness of the negative electrode active material layer is preferably 15 ⁇ m or more and 150 ⁇ m or less, more preferably 20 ⁇ m or more and 120 ⁇ m or less.
- the negative electrode for a lithium ion secondary battery of the present invention can be produced by coating a current collector with a solution obtained by dissolving or dispersing the above negative electrode material in an organic solvent and drying the solution.
- organic solvent those mentioned above can be used, and from the viewpoint of the solubility or dispersibility of the resin composition, N-methyl-2-pyrrolidone, N,N'-dimethylimidazolidinone and ⁇ -butyrolactone is preferred.
- the coating method is not particularly limited, and examples thereof include a die coater method, a three-roll transfer coater method, a doctor blade method, a dip method, a direct roll method and a gravure method.
- a lithium ion secondary battery of the present invention includes the negative electrode, the positive electrode, and the non-aqueous electrolyte. Moreover, in one embodiment, the lithium ion secondary battery of the present invention includes a separator arranged between the negative electrode and the positive electrode.
- the positive electrode conventionally known positive electrodes used in lithium-ion secondary batteries can be appropriately used.
- the positive electrode can be produced by applying a positive electrode-forming material onto a current collector and drying it.
- the positive electrode forming material contains a positive electrode active material and a binder, and may additionally contain the above-described conductive agent and additives.
- positive electrode active materials include lithium cobalt oxide, lithium nickel oxide, lithium manganate, and lithium iron phosphate.
- the above-described polyimide or binder used as the negative electrode material can be used.
- a lithium foil or the like can be used as the positive electrode.
- separators can be used, for example, paper separators, resin separators such as polyethylene and polypropylene, glass fiber separators, and the like.
- the positive and negative electrodes are placed in a battery container, and the container is filled with an organic solvent in which an electrolyte is dissolved.
- the electrolyte is not particularly limited, and examples include LiPF6 , LiClO4, LiBF4 , LiClF4 , LiAsF6 , LiSbF6 , LiAlO4 , LiAlCl4 , CF3SO3Li , LiN ( CF3SO2 ).
- Non-aqueous electrolytes such as 3 , LiCl and LiI.
- LiPF 6 , LiClO 4 and CF 3 SO 3 Li which have high degrees of dissociation, are preferred.
- the organic solvent is also not particularly limited, and examples thereof include carbonate compounds, lactone compounds, ether compounds, sulfolane compounds, dioxolane compounds, ketone compounds, nitrile compounds, and halogenated hydrocarbon compounds.
- carbonates such as dimethyl carbonate, methyl ethyl carbonate, diethyl carbonate, ethylene carbonate, propylene carbonate, ethylene glycol dimethyl carbonate, propylene glycol dimethyl carbonate, ethylene glycol diethyl carbonate, and vinylene carbonate
- lactones such as ⁇ -butyl lactone.
- Ethers such as dimethoxyethane, tetrahydrofuran, 2-methyltetrahydrofuran, tetrahydropyran, 1,4-dioxane, sulfolane, sulfolane such as 3-methylsulfolane, dioxolane such as 1,3-dioxolane, 4-methyl- Ketones such as 2-pentanone, nitriles such as acetonitrile, pyropionitrile, valeronitrile and benzonitrile, halogenated hydrocarbons such as 1,2-dichloroethane, other methylformate, dimethylformamide, diethylformamide, dimethylsulfoxide , imidazolium salts, and quaternary ammonium salts. Furthermore, it may be a mixture of these.
- a carbonate compound which has low solubility of the polyimide used for the negative electrode and can suppress swelling of the polyimide, can be preferably used.
- Lithium-ion secondary batteries can be formed into any shape, such as cylindrical, coin-shaped, rectangular, or laminated. can be implemented.
- a negative electrode formed by coating a negative electrode current collector with a negative electrode active material and a positive electrode formed by coating a positive electrode current collector with a positive electrode active material are wound together via a separator. It is obtained by putting it in a battery can, injecting a non-aqueous electrolyte, and sealing it with insulating plates placed on the top and bottom.
- the disk-shaped negative electrode, the separator, the disk-shaped positive electrode, and the stainless plate are stacked and housed in a coin-shaped battery can, and a non-aqueous electrolyte is injected. Sealed.
- Example 2 Using the same apparatus as in Example 1, 43.25 g (100 mmol) BAPS, 30.44 g (100 mmol) PHBAAB, 62.04 g (200 mmol) ODPA, 868 g N-methyl-2-pyrrolidone, 4.0 g (50 mmol) pyridine ) and 87 g of toluene were added, and the mixture was reacted at 180° C. for 9 hours under a nitrogen atmosphere while toluene was removed from the system during the process to obtain a 15% by weight polyimide solution.
- Example 3 Using the same apparatus as in Example 1, 43.26 g (200 mmol) of 4,4'-diaminodiphenyl sulfide (ASD), which is an aromatic diamine compound represented by the following formula, 60.87 g (200 mmol) of PHBAAB, 89.67 g (400 mmol) of 1,2,4,5-cyclohexanetetracarboxylic dianhydride (HPMDA) represented by the formula, 538 g of N-methyl-2-pyrrolidone, 6.3 g (80 mmol) of pyridine and toluene 54 g of the polyimide solution was added and reacted for 14 hours at 180° C. in a nitrogen atmosphere while removing toluene from the system during the process to obtain a 25% by weight polyimide solution.
- ASD 4,4'-diaminodiphenyl sulfide
- HPMDA 1,2,4,5-cyclohexanetetracarboxylic dianhydr
- Example 4 Using the same apparatus as in Example 1, 121.74 g (400 mmol) of PHBAAB, 89.67 g (400 mmol) of HPMDA, 591 g of N-methyl-2-pyrrolidone, 6.3 g (80 mmol) of pyridine and 59 g of toluene were charged, A 25% by weight polyimide solution was obtained by reacting for 14 hours at 180° C. in a nitrogen atmosphere while removing toluene from the system during the process.
- Example 5 Using the same apparatus as in Example 1, 40.05 g (200 mmol) of 4,4'-diaminodiphenyl ether (ODA), which is an aromatic diamine compound represented by the following formula, 60.87 g (200 mmol) of PHBAAB, and 124 g of ODPA. 09 g (400 mmol), 959 g of N-methyl-2-pyrrolidone, 6.3 g (80 mmol) of pyridine and 96 g of toluene are added and reacted for 7 hours under a nitrogen atmosphere at 180°C while toluene is removed from the system during the process. A 18% by weight polyimide solution was thus obtained.
- ODA 4,4'-diaminodiphenyl ether
- Example 6 Using the same apparatus as in Example 1, 61.58 g (150 mmol) of 2,2-bis[4-(4-aminophenoxy)phenyl]propane (BAPP), which is an aromatic diamine compound represented by the following formula, 45.65 g (150 mmol) of PHBAAB, 93.07 g (300 mmol) of ODPA, 863 g of N-methyl-2-pyrrolidone, 4.8 g (60 mmol) of pyridine and 86 g of toluene were added, and the mixture was heated at 180° C. under a nitrogen atmosphere. was removed from the system and reacted for 7 hours to obtain a 18% by weight polyimide solution.
- BAPP 2,2-bis[4-(4-aminophenoxy)phenyl]propane
- Example 7 Using the same apparatus as in Example 1, ODA 20.02 g (100 mmol), BAPP 41.05 g (100 mmol), PHBAAB 30.44 g (100 mmol), ODPA 93.07 g (300 mmol), N-methyl-2-pyrrolidone 792 g , 4.8 g (60 mmol) of pyridine and 79 g of toluene were added, and the mixture was reacted at 180° C. for 7 hours under a nitrogen atmosphere while toluene was removed from the system during the process to obtain a 18% by weight polyimide solution.
- Example 8 Using the same apparatus as in Example 1, 64.87 g (150 mmol) of BAPS, 45.65 g (150 mmol) of PHBAAB, 46.53 g (150 mmol) of ODPA, and 3,4,3',4'- 48.33 g (150 mmol) of benzophenonetetracarboxylic dianhydride (BTDA), 886 g (150 mmol) of N-methyl-2-pyrrolidone, 4.8 g (60 mmol) of pyridine and 89 g of toluene were added, and the mixture was heated at 180° C. under a nitrogen atmosphere. A 18% by weight polyimide solution was obtained by reacting for 4 hours while removing toluene from the system during the process.
- BTDA benzophenonetetracarboxylic dianhydride
- the modulus of elasticity was measured using a tensile tester (manufactured by Shimadzu Corporation, trade name: AG-Xplus 50 kN) at a tensile speed of 10 mm/min in the MD and TD directions. were measured for elastic modulus, tensile strength and elongation. The average value of each measured value in MD direction and TD direction was calculated and used as elastic modulus, tensile strength and elongation. The measurement results were as shown in Table 1. In Table 1, "impossible to measure" in Examples 3 and 4 means that when the test piece is prepared, the polyimide solution is applied to the glass plate to obtain a polyimide single film. This indicates that the physical properties of the film could not be measured.
- an electrolytic copper foil having a thickness of 10 ⁇ m was prepared, and the negative electrode material 1 obtained as described above was applied to the surface of the electrolytic copper foil and dried to form a negative electrode active material layer having a thickness of 50 ⁇ m.
- the negative electrode 1 was produced by forming.
- negative electrode material 2 for lithium ion secondary batteries was prepared in the same manner as described above except that the composition of negative electrode material 1 for lithium ion secondary batteries was changed as follows, and this was used to prepare a negative electrode in the same manner as described above. 2 was produced.
- negative electrode material 3 for lithium ion secondary batteries was prepared in the same manner as described above, except that the composition of negative electrode material 1 for lithium ion secondary batteries was changed as follows. ⁇ Polyimide 15.0% by mass ⁇ Silicon 80.0% by mass ⁇ Conductive agent 5.00% by mass An electrolytic copper foil having a thickness of 10 ⁇ m was prepared as a current collector for the negative electrode, and the negative electrode material 3 obtained as described above was applied to the surface of the electrolytic copper foil and dried to form a negative electrode active material layer having a thickness of 25 ⁇ m. The negative electrode 3 was produced by forming.
- Lithium foil as the positive electrode, ethylene carbonate and ethyl methyl carbonate as the electrolytic solution, and a polyolefin single-layer separator (Celgard (registered trademark) 2500, manufactured by Celgard Co., Ltd.) were prepared, and each negative electrode obtained as described above was used.
- a coin cell type lithium ion secondary battery was produced.
- the lithium ion secondary battery produced as described above was allowed to stand in an environment of 25°C for 24 hours. After that, the performance evaluation of the lithium ion secondary battery was performed in an environment of 25° C. as follows.
- CC constant current charging to 5 mV at a current density equivalent to 0.1C
- CV constant voltage charging at 5 mV
- charge to a current density equivalent to 0.01C charge to 0.1C equivalent.
- CC constant current charging
- CV constant voltage
- CC constant current charging
- CC constant current
- a cycle of CC discharging to 1.2 V at a current density equivalent to 0.5 C was performed for 30 cycles at 25°C.
- “SiO60%” in Table 1 means negative electrode material 1 for lithium ion secondary batteries (a composition containing 60% by mass of silicon monoxide in the negative electrode active material), and “SiO100%” means lithium ions.
- the secondary battery negative electrode material 2 (a composition containing 100% by mass of silicon monoxide in the negative electrode active material). is a composition containing 100% by mass).
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Abstract
Description
リチウムイオン二次電池に含有させる負極活物質として、放電容量が高く、初回充放電効率およびサイクル特性に優れる、シリコン(Si)系材料が使用されているが、シリコンは充放電時における膨張収縮が大きく、繰り返しの使用により、負極活物質間の導電パスの切断や、集電体と負極活性物質層との剥離等が生じるおそれがあった。
また、本発明の別の目的は、当該ポリイミドを含むリチウムイオン二次電池の負極材料、当該負極材料からなる負極、および当該負極を備えたリチウムイオン二次電池を提供することである。
ジアミン成分が、下記式(1):
R1~R4が、水素原子であり、
R5~R8のいずれかが、炭素数6~10の芳香族基、フェノキシ基、ベンジル基またはベンジルオキシ基であり、それ以外のR5~R8が水素原子である。)で表される芳香族ジアミン化合物を含む、ポリイミド。
[2] 酸無水物成分が、脂環式酸無水物または芳香族酸無水物の少なくとも1種を含む、[1]に記載のポリイミド。
[3] 前記式(1)の化合物が、ジアミン成分中に20モル%以上の割合で含まれる、[1]または[2]に記載のポリイミド。
[4] [1]~[3]のいずれか一項に記載のポリイミドと、負極活物質としてシリコン系負極活物質とを含む、リチウムイオン二次電池の負極材料。
[5] 前記シリコン系負極活物質が、負極活物質100質量部に対して、30質量部以上の割合で含まれる、[4]に記載の負極材料。
[6] 負極集電体と、前記負極集電体上に形成された負極活性物質層とを備えたリチウムイオン二次電池用負極であって、
前記負極活性物質層が、[4]または[5]に記載の負極材料からなる、リチウムイオン二次電池用負極。
[7] [6]に記載の負極と、正極と、非水電解質とを含む、リチウムイオン二次電池。
本発明において、「溶媒可溶性」とは、100gの有機溶媒に5g以上溶解することを意味する。
また「芳香族基」には、酸素原子、窒素原子や炭素原子を介して主骨格と結合する置換基が含まれる。さらに、芳香族基には、ピロール基等のヘテロ芳香族基が含まれる。
本発明のポリイミドは、下記式(1)で表される芳香族ジアミン化合物を含むジアミン成分と酸無水物成分との反応物である。
R1~R4が、水素原子であり、
R5~R8のいずれかが、炭素数6~10の芳香族基、フェノキシ基、ベンジル基またはベンジルオキシ基であり、それ以外のR5~R8が水素原子である。)
上記した本発明のポリイミドは、リチウムイオン二次電池用負極材料(以下、単に「負極材料」と略す場合がある。)、とりわけ負極のバインダー成分として好適に使用することができる。すなわち、バインダーとして上記したポリイミドと、負極活物質とを含む負極材料として使用することができる。
本発明のリチウムイオン二次電池用負極は、負極集電体と、該負極集電体上に形成された負極活性物質層とを備え、該負極活性物質層が上記した負極材料からなるものである。
本発明のリチウムイオン二次電池は、上記負極と正極と非水電解質とを備える。また、一実施形態において、本発明のリチウムイオン二次電池は、負極と正極との間に配置されたセパレータを備える。
[実施例1]
窒素導入管、撹拌装置を備えた500mlセパラブルフラスコに、下記式で表される芳香族ジアミン化合物であるビス[4-(4-アミノフェノキシ)フェニル]スルホン(BAPS)64.88g(150ミリモル)、下記式で表される芳香族ジアミン化合物である(2-フェニル-4-アミノフェニル)-4-アミノベンゾエート(PHBAAB)15.22g(50ミリモル)、下記式で表されるジフェニル-3,3’,4,4’-テトラカルボン酸二無水物(ODPA)62.04g(200ミリモル)、N-メチル-2-ピロリドン868g、ピリジン4.0g(50ミリモル)およびトルエン87gを投入し、窒素雰囲気下、180℃で、途中トルエンを系外に除きながら9時間反応させることにより、15重量%のポリイミド溶液を得た。
実施例1と同様の装置を用い、BAPS43.25g(100ミリモル)、PHBAAB30.44g(100ミリモル)、ODPA62.04g(200ミリモル)、N-メチル-2-ピロリドン868g、ピリジン4.0g(50ミリモル)およびトルエン87gを投入し、窒素雰囲気下、180℃で、途中トルエンを系外に除きながら9時間反応させることにより、15重量%のポリイミド溶液を得た。
実施例1と同様の装置を用い、BAPS86.5g(200ミリモル)、ODPA62.04g(200ミリモル)、N-メチル-2-ピロリドン868g、ピリジン4.0g(50ミリモル)およびトルエン87gを投入し、窒素雰囲気下、180℃で、途中トルエンを系外に除きながら9時間反応させることにより、15重量%のポリイミド溶液を得た。
実施例1と同様の装置を用い、下記式で表される芳香族ジアミン化合物である4,4’-ジアミノジフェニルスルフィド(ASD)43.26g(200ミリモル)、PHBAAB60.87g(200ミリモル)、下記式で表される1,2,4,5-シクロヘキサンテトラカルボン酸二無水物(HPMDA)89.67g(400ミリモル)、N-メチル-2-ピロリドン538g、ピリジン6.3g(80ミリモル)およびトルエン54gを投入し、窒素雰囲気下、180℃で、途中トルエンを系外に除きながら14時間反応させることにより、25重量%のポリイミド溶液を得た。
実施例1と同様の装置を用い、PHBAAB121.74g(400ミリモル)、HPMDA89.67g(400ミリモル)、N-メチル-2-ピロリドン591g、ピリジン6.3g(80ミリモル)およびトルエン59gを投入し、窒素雰囲気下、180℃で、途中トルエンを系外に除きながら14時間反応させることにより、25重量%のポリイミド溶液を得た。
実施例1と同様の装置を用い、ASD86.52g(400ミリモル)、HPMDA89.67g(400ミリモル)、N-メチル-2-ピロリドン485g、ピリジン6.3g(80ミリモル)およびトルエン49gを投入し、窒素雰囲気下、180℃で、途中トルエンを系外に除きながら14時間反応させることにより、25重量%のポリイミド溶液を得た。
実施例1と同様の装置を用い、下記式で表される芳香族ジアミン化合物である4,4’-ジアミノジフェニルエーテル(ODA)40.05g(200ミリモル)、PHBAAB60.87g(200ミリモル)、ODPA124.09g(400ミリモル)、N-メチル-2-ピロリドン959g、ピリジン6.3g(80ミリモル)およびトルエン96gを投入し、窒素雰囲気下、180℃で、途中トルエンを系外に除きながら7時間反応させることにより、18重量%のポリイミド溶液を得た。
実施例1と同様の装置を用い、下記式で表される芳香族ジアミン化合物である2,2-ビス[4-(4-アミノフェノキシ)フェニル]プロパン(BAPP)61.58g(150ミリモル)、PHBAAB45.65g(150ミリモル)、ODPA93.07g(300ミリモル)、N-メチル-2-ピロリドン863g、ピリジン4.8g(60ミリモル)およびトルエン86gを投入し、窒素雰囲気下、180℃で、途中トルエンを系外に除きながら7時間反応させることにより、18重量%のポリイミド溶液を得た。
実施例1と同様の装置を用い、ODA20.02g(100ミリモル)、BAPP41.05g(100ミリモル)、PHBAAB30.44g(100ミリモル)、ODPA93.07g(300ミリモル)、N-メチル-2-ピロリドン792g、ピリジン4.8g(60ミリモル)およびトルエン79gを投入し、窒素雰囲気下、180℃で、途中トルエンを系外に除きながら7時間反応させることにより、18重量%のポリイミド溶液を得た。
実施例1と同様の装置を用い、BAPS64.87g(150ミリモル)、PHBAAB45.65g(150ミリモル)、ODPA46.53g(150ミリモル)、下記式で表される3,4,3’,4’-ベンゾフェノンテトラカルボン酸二無水物(BTDA)48.33g(150ミリモル)、N-メチル-2-ピロリドン886g、ピリジン4.8g(60ミリモル)およびトルエン89gを投入し、窒素雰囲気下、180℃で、途中トルエンを系外に除きながら4時間反応させることにより、18重量%のポリイミド溶液を得た。
実施例1~8および比較例1~2において得られた各ポリイミド溶液を、スピンコート法にて10cm角のガラス板上に塗布し、100℃で0.5時間、200℃で0.5時間、250℃で1時間乾燥した。その後、ガラス板から剥離しカットすることにより、縦80mm×横10mm×厚さ15μmの試験片を得た。
得られたポリイミドをバインダーとし、負極活物質として一酸化ケイ素(SiO)および黒鉛、ならびに導電剤を、以下の組成で混合し、リチウムイオン二次電池用負極材料1を調製した。
・ポリイミド 10.0質量%
・一酸化ケイ素 52.2質量%
・黒鉛 34.8質量%
・導電剤 3.00質量%
・ポリイミド 10.0質量%
・一酸化ケイ素 87.0質量%
・導電剤 3.00質量%
・ポリイミド 15.0質量%
・ケイ素 80.0質量%
・導電剤 5.00質量%
負極用集電体として、厚さ10μmの電解銅箔を準備し、電解銅箔の表面に上記のようにして得られた負極材料3を塗布、乾燥し、厚さ25μmの負極活性物質層を形成することにより、負極3を作製した。
続いて、0.2C相当の電流密度で5mVまでCC(定電流)充電を行い、続いて5mVでCV(定電圧)充電に切り替え、0.02C相当の電流密度になるまで充電したのち、0.2C相当の電流密度で1.2VまでCC放電するサイクルを25℃で3サイクル行い、続いて、0.5C相当の電流密度で5mVまでCC(定電流)充電を行い、続いて5mVでCV(定電圧)充電に切り替え、0.05CC相当の電流密度になるまで充電したのち、0.5C相当の電流密度で1.2VまでCC放電するサイクルを25℃で30サイクル行った。このときの30サイクル目の0.5C相当の放電容量をBとした。
サイクル特性は、下記式:
ΔC(%)=(B/A)×100
に基づいて算出した。サイクル特性評価は下記表1に示されるとおりであった。
Claims (7)
- 酸無水物成分が、脂環式酸無水物または芳香族酸無水物の少なくとも1種を含む、請求項1に記載のポリイミド。
- 前記式(1)の化合物が、ジアミン成分中に20モル%以上の割合で含まれる、請求項1または2に記載のポリイミド。
- 請求項1~3のいずれか一項に記載のポリイミドと、負極活物質としてシリコン系負極活物質とを含む、リチウムイオン二次電池の負極材料。
- 前記シリコン系負極活物質が、負極活物質100質量部に対して、30質量部以上の割合で含まれる、請求項4に記載の負極材料。
- 負極集電体と、前記負極集電体上に形成された負極活性物質層とを備えたリチウムイオン二次電池用負極であって、
前記負極活性物質層が、請求項4または5に記載の負極材料からなる、リチウムイオン二次電池用負極。 - 請求項6に記載の負極と、正極と、非水電解質とを含む、リチウムイオン二次電池。
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JP2023509143A JPWO2022202701A1 (ja) | 2021-03-22 | 2022-03-18 | |
CN202280023023.7A CN117043991A (zh) | 2021-03-22 | 2022-03-18 | 聚酰亚胺化合物、以及使用其的锂离子二次电池用负极材料、锂离子二次电池用负极及锂离子二次电池 |
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EP22775488.4A EP4318676A1 (en) | 2021-03-22 | 2022-03-18 | Polyimide compound, negative electrode material for lithium ion secondary batteries that uses said polyimide compound, negative electrode for lithium ion secondary batteries, and lithium ion secondary battery |
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WO2021053800A1 (ja) * | 2019-09-19 | 2021-03-25 | ウィンゴーテクノロジー株式会社 | 溶媒可溶性ポリイミド化合物、該溶媒可溶性ポリイミド化合物を含むリチウムイオン二次電池負極作製用樹脂組成物、該リチウムイオン二次電池負極作製用樹脂組成物を用いて構成されるリチウムイオン二次電池用負極、及び該リチウムイオン二次電池用負極を備えるリチウムイオン二次電池 |
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JP2013077498A (ja) * | 2011-09-30 | 2013-04-25 | Nippon Zeon Co Ltd | リチウムイオン二次電池用負極及びその製造方法 |
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