CN104157863B - The preparation method of a kind of microdilatancy graphite cathode material - Google Patents
The preparation method of a kind of microdilatancy graphite cathode material Download PDFInfo
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- CN104157863B CN104157863B CN201410418571.7A CN201410418571A CN104157863B CN 104157863 B CN104157863 B CN 104157863B CN 201410418571 A CN201410418571 A CN 201410418571A CN 104157863 B CN104157863 B CN 104157863B
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- graphite
- temperature
- lithium ion
- acid
- solids
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 69
- 229910002804 graphite Inorganic materials 0.000 title claims abstract description 56
- 239000010439 graphite Substances 0.000 title claims abstract description 56
- 238000002360 preparation method Methods 0.000 title claims abstract description 14
- 239000010406 cathode material Substances 0.000 title abstract description 6
- 239000007787 solid Substances 0.000 claims abstract description 34
- 230000003647 oxidation Effects 0.000 claims abstract description 27
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 27
- 239000007770 graphite material Substances 0.000 claims abstract description 26
- 239000000843 powder Substances 0.000 claims abstract description 14
- 239000000706 filtrate Substances 0.000 claims abstract description 13
- 239000000138 intercalating agent Substances 0.000 claims abstract description 11
- 238000009830 intercalation Methods 0.000 claims description 33
- 230000002687 intercalation Effects 0.000 claims description 33
- 238000001035 drying Methods 0.000 claims description 26
- WFDIJRYMOXRFFG-UHFFFAOYSA-N Acetic anhydride Chemical compound CC(=O)OC(C)=O WFDIJRYMOXRFFG-UHFFFAOYSA-N 0.000 claims description 24
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 claims description 21
- 238000000034 method Methods 0.000 claims description 18
- 238000002156 mixing Methods 0.000 claims description 17
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 claims description 16
- VLTRZXGMWDSKGL-UHFFFAOYSA-N perchloric acid Chemical compound OCl(=O)(=O)=O VLTRZXGMWDSKGL-UHFFFAOYSA-N 0.000 claims description 16
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 14
- XBDQKXXYIPTUBI-UHFFFAOYSA-N dimethylselenoniopropionate Natural products CCC(O)=O XBDQKXXYIPTUBI-UHFFFAOYSA-N 0.000 claims description 14
- BDAGIHXWWSANSR-UHFFFAOYSA-N methanoic acid Natural products OC=O BDAGIHXWWSANSR-UHFFFAOYSA-N 0.000 claims description 14
- 230000001590 oxidative effect Effects 0.000 claims description 14
- 230000001007 puffing effect Effects 0.000 claims description 14
- 238000005406 washing Methods 0.000 claims description 13
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims description 12
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims description 11
- 238000006243 chemical reaction Methods 0.000 claims description 11
- 239000007773 negative electrode material Substances 0.000 claims description 11
- 229910017604 nitric acid Inorganic materials 0.000 claims description 11
- 239000007800 oxidant agent Substances 0.000 claims description 11
- 238000001291 vacuum drying Methods 0.000 claims description 11
- 238000001914 filtration Methods 0.000 claims description 9
- 229910000147 aluminium phosphate Inorganic materials 0.000 claims description 8
- 239000012286 potassium permanganate Substances 0.000 claims description 8
- OSWFIVFLDKOXQC-UHFFFAOYSA-N 4-(3-methoxyphenyl)aniline Chemical compound COC1=CC=CC(C=2C=CC(N)=CC=2)=C1 OSWFIVFLDKOXQC-UHFFFAOYSA-N 0.000 claims description 7
- 235000019253 formic acid Nutrition 0.000 claims description 7
- 235000006408 oxalic acid Nutrition 0.000 claims description 7
- 235000019260 propionic acid Nutrition 0.000 claims description 7
- IUVKMZGDUIUOCP-BTNSXGMBSA-N quinbolone Chemical compound O([C@H]1CC[C@H]2[C@H]3[C@@H]([C@]4(C=CC(=O)C=C4CC3)C)CC[C@@]21C)C1=CCCC1 IUVKMZGDUIUOCP-BTNSXGMBSA-N 0.000 claims description 7
- 229910021383 artificial graphite Inorganic materials 0.000 claims description 6
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 claims 1
- 239000012467 final product Substances 0.000 abstract 1
- 238000009413 insulation Methods 0.000 abstract 1
- 229910001416 lithium ion Inorganic materials 0.000 description 58
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 55
- 239000003990 capacitor Substances 0.000 description 45
- -1 lithium hexafluorophosphate Chemical compound 0.000 description 25
- 229910052744 lithium Inorganic materials 0.000 description 19
- 238000003756 stirring Methods 0.000 description 19
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 17
- 238000000576 coating method Methods 0.000 description 17
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- 239000011888 foil Substances 0.000 description 9
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- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical compound C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 description 8
- 125000000217 alkyl group Chemical group 0.000 description 8
- 229910052782 aluminium Inorganic materials 0.000 description 8
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 8
- 150000001412 amines Chemical class 0.000 description 8
- 239000011889 copper foil Substances 0.000 description 8
- 238000005096 rolling process Methods 0.000 description 8
- 239000008367 deionised water Substances 0.000 description 7
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- 239000003792 electrolyte Substances 0.000 description 7
- 229910052757 nitrogen Inorganic materials 0.000 description 7
- 239000002002 slurry Substances 0.000 description 7
- ZWEHNKRNPOVVGH-UHFFFAOYSA-N 2-Butanone Chemical compound CCC(C)=O ZWEHNKRNPOVVGH-UHFFFAOYSA-N 0.000 description 6
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 6
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 description 6
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- DPXJVFZANSGRMM-UHFFFAOYSA-N acetic acid;2,3,4,5,6-pentahydroxyhexanal;sodium Chemical compound [Na].CC(O)=O.OCC(O)C(O)C(O)C(O)C=O DPXJVFZANSGRMM-UHFFFAOYSA-N 0.000 description 3
- 239000010405 anode material Substances 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 238000007599 discharging Methods 0.000 description 3
- 230000002427 irreversible effect Effects 0.000 description 3
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 3
- 125000004123 n-propyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])* 0.000 description 3
- 238000004321 preservation Methods 0.000 description 3
- 235000019812 sodium carboxymethyl cellulose Nutrition 0.000 description 3
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- 229920003048 styrene butadiene rubber Polymers 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 125000000999 tert-butyl group Chemical group [H]C([H])([H])C(*)(C([H])([H])[H])C([H])([H])[H] 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 229920000049 Carbon (fiber) Polymers 0.000 description 2
- 239000004743 Polypropylene Substances 0.000 description 2
- 125000001931 aliphatic group Chemical group 0.000 description 2
- 125000003545 alkoxy group Chemical group 0.000 description 2
- 125000005233 alkylalcohol group Chemical group 0.000 description 2
- 229910021393 carbon nanotube Inorganic materials 0.000 description 2
- 239000002041 carbon nanotube Substances 0.000 description 2
- 239000003575 carbonaceous material Substances 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000009831 deintercalation Methods 0.000 description 2
- IEJIGPNLZYLLBP-UHFFFAOYSA-N dimethyl carbonate Chemical compound COC(=O)OC IEJIGPNLZYLLBP-UHFFFAOYSA-N 0.000 description 2
- 238000007598 dipping method Methods 0.000 description 2
- 239000002270 dispersing agent Substances 0.000 description 2
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- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 2
- 238000003475 lamination Methods 0.000 description 2
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 description 2
- 238000003760 magnetic stirring Methods 0.000 description 2
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- 125000004178 (C1-C4) alkyl group Chemical group 0.000 description 1
- BQCIDUSAKPWEOX-UHFFFAOYSA-N 1,1-Difluoroethene Chemical group FC(F)=C BQCIDUSAKPWEOX-UHFFFAOYSA-N 0.000 description 1
- GOXQRTZXKQZDDN-UHFFFAOYSA-N 2-Ethylhexyl acrylate Chemical compound CCCCC(CC)COC(=O)C=C GOXQRTZXKQZDDN-UHFFFAOYSA-N 0.000 description 1
- 125000004398 2-methyl-2-butyl group Chemical group CC(C)(CC)* 0.000 description 1
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- 125000004922 2-methyl-3-pentyl group Chemical group CC(C)C(CC)* 0.000 description 1
- 125000004493 2-methylbut-1-yl group Chemical group CC(C*)CC 0.000 description 1
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- 125000004920 4-methyl-2-pentyl group Chemical group CC(CC(C)*)C 0.000 description 1
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 description 1
- GAWIXWVDTYZWAW-UHFFFAOYSA-N C[CH]O Chemical group C[CH]O GAWIXWVDTYZWAW-UHFFFAOYSA-N 0.000 description 1
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- 239000001257 hydrogen Substances 0.000 description 1
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- 235000010979 hydroxypropyl methyl cellulose Nutrition 0.000 description 1
- UFVKGYZPFZQRLF-UHFFFAOYSA-N hydroxypropyl methyl cellulose Chemical compound OC1C(O)C(OC)OC(CO)C1OC1C(O)C(O)C(OC2C(C(O)C(OC3C(C(O)C(O)C(CO)O3)O)C(CO)O2)O)C(CO)O1 UFVKGYZPFZQRLF-UHFFFAOYSA-N 0.000 description 1
- 125000001972 isopentyl group Chemical group [H]C([H])([H])C([H])(C([H])([H])[H])C([H])([H])C([H])([H])* 0.000 description 1
- 239000003273 ketjen black Substances 0.000 description 1
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- XGZVUEUWXADBQD-UHFFFAOYSA-L lithium carbonate Chemical compound [Li+].[Li+].[O-]C([O-])=O XGZVUEUWXADBQD-UHFFFAOYSA-L 0.000 description 1
- 229910052808 lithium carbonate Inorganic materials 0.000 description 1
- MHCFAGZWMAWTNR-UHFFFAOYSA-M lithium perchlorate Chemical compound [Li+].[O-]Cl(=O)(=O)=O MHCFAGZWMAWTNR-UHFFFAOYSA-M 0.000 description 1
- 229910001486 lithium perchlorate Inorganic materials 0.000 description 1
- 229910003002 lithium salt Inorganic materials 0.000 description 1
- 159000000002 lithium salts Chemical class 0.000 description 1
- 229910001496 lithium tetrafluoroborate Inorganic materials 0.000 description 1
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- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 1
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Substances N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 1
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 1
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- 125000004430 oxygen atom Chemical group O* 0.000 description 1
- 125000003538 pentan-3-yl group Chemical group [H]C([H])([H])C([H])([H])C([H])(*)C([H])([H])C([H])([H])[H] 0.000 description 1
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Classifications
-
- 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
- H01M4/58—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
- H01M4/5835—Comprising fluorine or fluoride salts
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
- H01G11/04—Hybrid capacitors
- H01G11/06—Hybrid capacitors with one of the electrodes allowing ions to be reversibly doped thereinto, e.g. lithium ion capacitors [LIC]
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
- H01G11/22—Electrodes
- H01G11/30—Electrodes characterised by their material
- H01G11/32—Carbon-based
-
- 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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Abstract
The present invention relates to the preparation method that a kind of expansion multiple is the doubly controlled microdilatancy graphite cathode material of 2-10, comprise following step: after being mixed according to the mass ratio of 1:0.05-1.0:0.5-10 with oxygenant, intercalator by cell-grade powder body graphite material, at 10-40 DEG C, layer 30-60min is inserted in oxidation, then solids is at room temperature filtered to isolate, solids is washed to filtrate pH6-7, send at inert atmosphere, expanded 1-30min at 200-800 DEG C in horizontal pipe furnace after dry, after insulation and get final product.
Description
Technical Field
The invention relates to micro-expanded graphite, in particular to a preparation method of a micro-expanded graphite material for a negative electrode of a lithium ion capacitor.
Background
The negative electrode of a Lithium-ion capacitor (LIC) is graphite pre-embedded with Lithium, so that the Lithium-ion capacitor is actually an asymmetric capacitor with different charging and discharging principles of the positive electrode and the negative electrode, combines the advantages of a super capacitor and a Lithium-ion battery, has higher energy density and power density, and has wider application prospect.
The lithium ion capacitor has higher energy density and power density, and the charge and discharge current density required to be released in the application field of the lithium ion capacitor is generally higher than that of a lithium ion battery. When a graphite material, which is commonly used as a negative electrode of a lithium ion battery, is used as a negative electrode of a lithium ion capacitor, it is not suitable for large current charge and discharge because it has a high orientation due to its complete crystallization, and along with Li, it is not suitable for large current charge and discharge+In d and out of002The direction can generate about 10 percent of expansion and contraction, and the laminated structure is easy to damage, thereby leading to poor cycle life; the graphite surface has more active positions, so that a compact and uniform Solid Electrolyte Interface (SEI) film is not easy to generate in the process of lithium intercalation for the first time, and the first irreversible capacity is higher; in addition, the graphite with a highly oriented layered structure is very sensitive to the electrolyte, so that the graphite has poor compatibility with the electrolyte and influences the cycle performance; ultimately affecting the energy density, output power, and cycle performance of the lithium ion capacitor. Therefore, the micro-expansion modification of the graphite material is a feasible method to provide a lithium ion capacitor negative electrode material with higher energy density, higher output power and excellent cycle performance, a preparation method thereof and a lithium ion capacitor adopting the micro-expansion graphite.
In patent CN103693640A, graphite is subjected to intercalation oxidation by concentrated nitric acid, and the temperature is kept at 600 ℃ for 10h to obtain the low-temperature lithium ion battery cathode expanded graphite. Patent CN103227056A puffing expandable graphite in a muffle furnace to obtain expanded graphite, and preparing a lithium iron phosphate/expanded graphite composite precursor by mechanical mixing and ultrasonic processing; the composite electrode material is obtained by carbonization and is used as the anode of the lithium ion capacitor, so that the utilization rate of the lithium iron phosphate active substance is improved, and the internal resistance of the material is reduced. At present, the application of the micro-expanded graphite to the negative electrode of the lithium ion capacitor is not seen.
Disclosure of Invention
Summary of the invention:
aiming at the defects of the prior art, the invention adopts a micro-expansion graphite material as a negative electrode active material of a lithium ion capacitor, and provides the following technical scheme:
the technical scheme of the first aspect of the invention provides a micro-expanded graphite cathode material, which is prepared by the following method: mixing a battery-grade powder graphite material, an oxidant and an intercalator according to a mass ratio of 1:0.05-1.0:0.5-10, carrying out oxidation intercalation for 30-60min at 10-40 ℃, filtering and separating out solids at room temperature, washing the solids until the pH of filtrate is 6-7, drying, then sending into a horizontal tube furnace, expanding for 1-30min at 200-800 ℃, and preserving heat to obtain a micro-expansion graphite material with controllable expansion multiple of 2-10 times; wherein:
the powder graphite material is selected from natural crystalline flake graphite, spherical graphite or artificial graphite;
the oxidant is selected from potassium permanganate, ferric trichloride or hydrogen peroxide;
the intercalation agent is selected from concentrated nitric acid, perchloric acid, concentrated phosphoric acid, formic acid, acetic anhydride, propionic acid and oxalic acid;
the temperature rise rate of the expansion is 5-20 ℃/min.
The technical scheme of the second aspect of the invention provides a preparation method of a micro-expanded graphite cathode material, which comprises the following steps: mixing a battery-grade powder graphite material, an oxidant and an intercalator according to a mass ratio of 1:0.05-1.0:0.5-10, carrying out oxidation intercalation for 30-60min at 10-40 ℃, filtering and separating out solids at room temperature, washing the solids until the pH of filtrate is 6-7, drying, then sending into a horizontal tube furnace, expanding for 1-30min at 200-800 ℃, and preserving heat to obtain a micro-expansion graphite material with controllable expansion multiple of 2-10 times; wherein,
the powder graphite material is selected from natural crystalline flake graphite, spherical graphite or artificial graphite;
the oxidant is selected from potassium permanganate, ferric trichloride or hydrogen peroxide;
the intercalating agent is selected from concentrated nitric acid, perchloric acid, concentrated phosphoric acid, formic acid, acetic anhydride, propionic acid or oxalic acid;
the temperature rise rate of the expansion is 5-20 ℃/min.
According to the technical scheme of the third aspect of the invention, the application of the micro-expanded graphite material as the negative electrode material of the lithium ion capacitor is provided, the micro-expanded graphite material, the conductive agent and the binder are uniformly mixed in the solvent according to the mass ratio of 80-90:4-8:6-12 to prepare slurry, the slurry is coated on the front surface and the back surface of a copper foil current collector and dried, the coating thickness of the single surface is 30-100 mu m, the pole piece is rolled by using a roller press, and the rolled pole piece is cut into the negative electrode piece of the lithium ion capacitor by using a splitting machine;
the expansion multiple of the micro-expansion graphite material is 2-10 times, and the micro-expansion graphite material is prepared by the following method: mixing a battery-grade powder graphite material, an oxidant and an intercalator according to the mass ratio of 1:0.05-1.0:0.5-10, carrying out oxidation intercalation for 30-60min at the temperature of 10-40 ℃, filtering and separating out solids at room temperature, washing the solids until the pH value of filtrate is 6-7, drying, then sending into a horizontal tube furnace, expanding for 1-30min at the temperature of 200-; wherein,
the powder graphite material is selected from natural crystalline flake graphite, spherical graphite or artificial graphite;
the oxidant is selected from potassium permanganate, ferric trichloride or hydrogen peroxide;
the intercalating agent is selected from concentrated nitric acid, perchloric acid, concentrated phosphoric acid, formic acid, acetic anhydride, propionic acid or oxalic acid;
the temperature rise rate of the expansion is 5-20 ℃/min.
In a fourth aspect of the present invention, there is provided a lithium ion capacitor, including a diaphragm, a lithium ion source, a housing, a negative electrode plate, a positive electrode plate, and a lithium-containing organic electrolyte, wherein:
the negative plate uses a micro-expansion graphite material as a negative active material, the micro-expansion graphite material, a conductive agent and a binder are uniformly mixed in a solvent according to a mass ratio of 80-90:4-8:6-12, prepared into slurry, coated on the front surface and the back surface of a copper foil current collector and dried, the coating thickness of one surface is 30-100 mu m, the plate is rolled by a roller press, and the rolled plate is cut into pieces by a splitting machine to obtain the negative plate;
the positive plate is prepared by uniformly mixing a positive active material, a conductive agent and a binder in a solvent according to the mass ratio of 70-90:6-20:4-10 to prepare slurry, coating the slurry on the front side and the back side of an aluminum foil current collector and drying, wherein the coating thickness of one side is 50-150 mu m, rolling the plate by using a roller press, and slitting the rolled plate by using a slitting machine;
the lithium-containing organic electrolyte is a solution formed by dissolving lithium salt selected from lithium perchlorate, lithium hexafluorophosphate, lithium tetrafluoroborate, lithium organoborate, lithium perfluoroalkyl sulfonate, lithium perfluoroalkyl sulfonyl imide, lithium organophosphate or lithium organoaluminum ester in an electrolyte solvent selected from propylene carbonate, ethylene carbonate, dimethyl carbonate, diethyl carbonate or ethyl methyl carbonate;
the micro-expansion graphite material used by the negative plate has an expansion coefficient of 2-5 times, and is prepared by the following method: mixing a battery-grade powder graphite material, an oxidant and an intercalator according to the mass ratio of 1:0.2-0.6:2-5, carrying out oxidation intercalation for 30-60min at the temperature of 10-40 ℃, filtering and separating out solids at room temperature, washing the solids until the pH value of filtrate is 6-7, drying, then sending into a horizontal tube furnace, expanding for 1-10min at the temperature of 400-; wherein the powder graphite material is selected from natural crystalline flake graphite, spherical graphite or artificial graphite; the oxidant is selected from potassium permanganate, ferric trichloride or hydrogen peroxide; the intercalation agent is selected from concentrated nitric acid, perchloric acid, concentrated phosphoric acid, formic acid, acetic anhydride, propionic acid and oxalic acid; the temperature rise rate of the expansion is 5-20 ℃/min.
Detailed description of the invention:
according to the micro-expanded graphite anode material provided by the technical scheme of the first aspect of the invention, or the preparation method provided by the technical scheme of the second aspect of the invention, or the application provided by the technical scheme of the third aspect of the invention:
1) in some embodiments, the reaction system is also agitated during oxidative intercalation.
2) In some embodiments, after the solids are washed to a filtrate pH of 6-7, the solids are washed with absolute ethanol and dried.
3) In some embodiments, the mass ratio of the battery-grade powdered graphite material to the oxidant and the intercalant is 1:0.2-0.6: 2-5.
4) In some embodiments, the drying is vacuum drying at a temperature of 60-70 ℃; the vacuum drying time is 6-12 h.
5) In some embodiments, the expansion temperature is 400-.
6) In some embodiments, the temperature increase rate for puffing is 10 ℃/min.
7) In some embodiments, the micro-expanded graphite anode material has a multiple expansion of 2 to 5.
The technical scheme according to the third aspect of the invention provides the following applications:
1) the solvent used for the negative electrode sheet is usually water, an organic solvent may be used, or a mixed solvent of water and an organic solvent may be used. Wherein the organic solvent comprises alkyl alcohols such as methanol, ethanol and propanol, alkyl ketones such as acetone and methyl ethyl ketone, ethers such as tetrahydrofuran, dioxane and diglyme, and phthalein amine solvents such as diethyl methyl phthalein amine, dimethyl ethyl phthalein amine and N-methyl pyrrolidone, and in some embodiments, the solvent used in the negative electrode sheet is selected from water、C1-C4Alkyl alcohol, C3-C6Alkyl ketones, tetrahydrofuran, dioxane, diglyme, diethylmethanephthalide, dimethylethyleneamine or N-methylpyrrolidone, and in further embodiments the solvent is selected from water or N-methylpyrrolidone.
2) The coating method of the negative electrode sheet includes a doctor blade method, a dipping method, a transfer coating method, a gravure printing method, an extrusion coating method, etc., and in some embodiments, the coating is performed using a transfer coater.
3) The rolling method of the negative plate comprises a cold roll method, pre-roll preheating, oil bath hot rolls, steam hot rolls and other hot rolling methods, and in some embodiments, the cold roll method is adopted.
According to the lithium ion capacitor provided by the technical scheme of the fourth aspect of the invention:
1) in some embodiments, the conductive agent employed in the positive or negative electrode sheet is independently selected from metal powder, acetylene black, ketjen black, furnace black, conductive carbon black, conductive graphite, carbon nanotubes, carbon fibers, or graphene.
2) In some embodiments, the binder employed in the positive or negative electrode sheet is independently selected from the group consisting of polyethylene oxide, sodium carboxymethylcellulose, ammonium carboxymethylcellulose, hydroxyethylcellulose, hydroxypropylcellulose, hydroxypropylmethylcellulose, styrene-butadiene rubber, poly-2-ethylhexyl acrylate, methyl methacrylate-styrene-butadiene rubber, acrylonitrile-butadiene rubber, polyacrylate, polyacrylonitrile, polyimide, poly-N-vinylacetamide, or polytetrafluoroethylene, or is independently selected from the group consisting of vinylidene fluoride, polyvinyl alcohol, or polytetrafluoroethylene.
3) In some embodiments, the reaction system is also agitated during oxidative intercalation.
4) In some embodiments, after the solids are washed to a filtrate pH of 6-7, the solids are washed with absolute ethanol and dried.
5) In some embodiments, the drying is vacuum drying at a temperature of 60-70 ℃; the vacuum drying time is 6-12 h.
6) In some embodiments, the temperature increase rate for puffing is 10 ℃/min.
7) In some embodiments, the micro-expanded graphite anode material has a multiple expansion of 2 to 5.
8) The cathode material comprises a porous carbon material capable of reversibly adsorbing electrolyte anions or lithium ions, and in some embodiments, the cathode active material is selected from activated carbon powder, activated carbon fibers, carbon aerogel or carbon nanotubes.
9) The solvent used for the positive and negative electrode sheets of the lithium ion capacitor is usually water, an organic solvent, or a mixed solvent of water and an organic solvent. Some of the solvents include alkyl alcohols such as methanol, ethanol and propanol, alkyl ketones such as acetone and methyl ethyl ketone, ethers such as tetrahydrofuran, dioxane and diglyme, and phthalein amine solvents such as diethylmethyl phthalein amine, dimethylethyl phthalein amine and N-methylpyrrolidone, and in some embodiments, the solvent used in the positive electrode sheet or the negative electrode sheet is selected from water, C1-C4 alkyl alcohol, C3-C6 alkyl ketone, tetrahydrofuran, dioxane, diglyme, diethylmethyl phthalein amine, dimethylethyl phthalein amine and N-methylpyrrolidone, and in some embodiments, the solvent is selected from water and N-methylpyrrolidone.
10) The current collectors are divided into aluminum foil current collectors and copper foil current collectors, wherein the positive plate adopts an aluminum foil current collector, the negative plate adopts a copper foil current collector, the aluminum foil current collectors and the copper foil current collectors both penetrate through porous foils, and the aperture is 0.1-100 μm, and in some embodiments, the aperture is 1-20 μm; the open porosity is 10% to 80%, and in some embodiments, the open porosity is 30% to 60%.
11) The coating method of the positive electrode sheet or the negative electrode sheet includes a doctor blade method, a dipping method, a transfer coating method, a gravure printing method, an extrusion coating method, and the like, and in some embodiments, the coating is performed using a transfer coater independently from each other.
12) The rolling method of the positive electrode sheet or the negative electrode sheet includes a cold roll method, pre-roll preheating, a hot roll method such as an oil bath hot roll and a steam hot roll, and in some embodiments, the cold roll method is independently used.
13) The diaphragm can be a polyethylene porous film, a polypropylene porous film, a glass fiber porous film or a non-woven fabric film, and is arranged between the positive plate, the negative plate and the lithium ion supply source.
14) The lithium ion source is a lithium-containing compound or a lithium metal body containing lithium ions, and may be a mixture of at least one or more of metallic lithium powder, lithium foil, lithium sheet, lithium mesh, stabilized lithium ion powder, lithium foam, lithium carbonate, lithium sulfur compound, lithium polymer, and the like.
15) The structure of the lithium ion capacitor is shown in fig. 3 and 4, the structure of the lithium ion capacitor comprises a positive plate, a negative plate, a diaphragm, a lithium ion supply source, electrolyte and a shell, the lithium ion capacitor is internally laminated in a diaphragm-negative plate-diaphragm-positive plate-diaphragm … … negative plate-diaphragm-lithium ion supply source mode, and in some embodiments, the shell is packaged by an aluminum plastic film.
The stirring mode of the stirring device comprises magnetic stirring, PTFE stirring paddle stirring and glass rod stirring, and in some embodiments, the magnetic stirring mode is adopted.
The water used in the embodiments of the present invention is deionized water.
The "room temperature" referred to herein means a temperature of 20 to 30 ℃.
The inert atmosphere is selected from nitrogen, argon or helium, so that the carbon material and oxygen are prevented from reacting at high temperature and being ablated when the expanded graphite is prepared.
The term "alkyl" as used herein includes straight or branched chain saturated monovalent hydrocarbon radicals of 1 to 12 carbon atoms, wherein the alkyl radical may be independently optionally substituted with one or moreA plurality of substituents described herein. Further examples of alkyl groups include, but are not limited to, methyl (Me, -CH)3) Ethyl (Et, -CH)2CH3) N-propyl (n-Pr, -CH)2CH2CH3) Isopropyl (i-Pr, -CH (CH)3)2) N-butyl (n-Bu, -CH)2CH2CH2CH3) 2-methylpropyl or isobutyl (i-Bu, -CH)2CH(CH3)2) 1-methylpropyl or sec-butyl (s-Bu, -CH (CH)3)CH2CH3) Tert-butyl (t-Bu, -C (CH)3)3) N-pentyl (-CH)2CH2CH2CH2CH3) 2-pentyl (-CH (CH)3)CH2CH2CH3) 3-pentyl (-CH (CH)2CH3)2) 2-methyl-2-butyl (-C (CH)3)2CH2CH3) 3-methyl-2-butyl (-CH (CH)3)CH(CH3)2) 3-methyl-1-butyl (-CH)2CH2CH(CH3)2) 2-methyl-1-butyl (-CH)2CH(CH3)CH2CH3) N-hexyl (-CH)2CH2CH2CH2CH2CH3) 2-hexyl (-CH (CH)3)CH2CH2CH2CH3) 3-hexyl (-CH (CH)2CH3)(CH2CH2CH3) 2-methyl-2-pentyl (-C (CH))3)2CH2CH2CH3) 3-methyl-2-pentyl (-CH (CH)3)CH(CH3)CH2CH3) 4-methyl-2-pentyl (-CH (CH)3)CH2CH(CH3)2) 3-methyl-3-pentyl (-C (CH)3)(CH2CH3)2) 2-methyl-3-pentyl (-CH (CH)2CH3)CH(CH3)2) 2, 3-dimethyl-2-butyl (-C (CH)3)2CH(CH3)2) 3, 3-dimethyl-2-butyl (-CH (CH)3)C(CH3)3) N-heptyl, n-octyl, and the like. The term "alkyl group"and its prefix" alkane "as used herein, both include straight and branched saturated carbon chains.
As used herein, the definition "fluoroalkyl" refers to an alkyl group substituted with one or more of the same or different fluorine atoms, wherein alkyl has the meaning described herein, and such examples include, but are not limited to, trifluoromethyl, trifluoroethyl, and the like.
As used herein, the definition "hydroxyaliphatic", "hydroxy-substituted alkyl" refers to an aliphatic group or an alkyl group substituted with one or more hydroxy groups, wherein the aliphatic or alkyl group has the meaning described herein, examples of which include, but are not limited to, hydroxyethyl, 2-hydroxypropyl, hydroxymethyl, and the like.
The definition "alkoxy" as used herein, relates to an alkyl group, as defined herein, attached to the main carbon chain through an oxygen atom ("alkoxy").
The numbers in this disclosure are approximate, regardless of whether the word "about" or "approximately" is used. The numerical value of the number may have differences of 1%, 2%, 5%, 7%, 8%, 10%, etc. Whenever a number with a value of N is disclosed, any number with a value of N +/-1%, N +/-2%, N +/-3%, N +/-5%, N +/-7%, N +/-8% or N +/-10% is explicitly disclosed, wherein "+/-" means plus or minus, and a range between N-10% and N + 10% is also disclosed. For example, for "the temperature rise rate for puffing is 10 ℃/min", values of 10 ℃/min +/-1%, 10 ℃/min +/-2%, 10 ℃/min +/-3%, 10 ℃/min +/-5%, 10 ℃/min +/-7%, 10 ℃/min +/-8% and 10 ℃/min +/-10% are disclosed simultaneously, and the temperature range between 10 ℃/min-10% and 10 ℃/min + 10% also falls within the disclosed range, i.e., values between 9-11 ℃/min are all within the included range of the temperature rise rate for puffing.
The definition "or" as used herein denotes alternatives which may be combined if appropriate, that is to say the term "or" includes each of the listed individual alternatives as well as combinations thereof. For example, the phrase "the intercalating agent is selected from concentrated nitric acid, perchloric acid, concentrated phosphoric acid, formic acid, acetic anhydride, propionic acid, or oxalic acid" means that the intercalating agent may be one of concentrated nitric acid, perchloric acid, concentrated phosphoric acid, formic acid, acetic anhydride, propionic acid, or oxalic acid, or a combination of one or more thereof.
All ranges cited herein are inclusive, unless expressly stated to the contrary. For example, "200 ℃ and 800 ℃ puffing" means that the puffing temperature T is in the range of 200 ℃ to T800 ℃.
At present, the micro-expanded graphite with low and controllable expansion factor adopted by the technical scheme of the invention is not reported and described as the negative electrode material of the lithium ion capacitor. It has following beneficial effect: the micro-expanded graphite adopted by the invention has lower expansion multiple and is controllable, and the defects of low volume energy density and large irreversible capacity when the high-expansion-multiple expanded graphite prepared by the traditional methods such as chemical oxidation, high-temperature explosion and the like is used as a lithium ion capacitor negative electrode material can be avoided; the lithium ion capacitor adopting the micro-expanded graphite as the cathode shows excellent energy density, power density and excellent cycle stability, which benefits from micro-expansion treatment to introduce a large number of nano-holes, channels and other structures, and Li+Can be stored at the positions in a cluster mode, and the micro-expansion treatment removes a certain amount of chemical bonds such as carbon-hydrogen bonds, carbon-oxygen bonds, surface carboxyl groups and hydroxyl groups on the surface of the graphite, and high-chemical-activity structural defects such as carbon atom vacancy, carbon chain and staggered layers and the like on the surface of the graphite, so that the unstable structures are prevented from being stored in Li+The lithium ion capacitor has the advantages that the lithium ion capacitor reacts with lithium in the intercalation/deintercalation process to reduce irreversible capacity, and on the other hand, a large number of micro-nano holes or channels are formed in the micro-expanded graphite structure, so that the lithium intercalation/deintercalation channels are increased, and large-current charging and discharging are facilitated, and therefore, the energy density, the output power and the cycle life of the lithium ion capacitor adopting the micro-expanded graphite are improved.
Drawings
Fig. 1 and 2 are scanning electron micrographs of the negative electrode material of micro-expanded graphite of example 1.
Fig. 3 is a schematic view of the inside of the lithium ion capacitor prepared in example 1. In the figure, 1 is a lithium ion supply source, 2 is a separator, 3 is a negative electrode sheet, and 4 is a positive electrode sheet.
Fig. 4 is a schematic external view of the lithium ion capacitor prepared in example 1. In the figure, 5 denotes a case, 6 denotes a positive electrode terminal, and 7 denotes a negative electrode terminal.
Detailed Description
The following are preferred embodiments of the present invention, and the present invention is not limited to the following preferred embodiments. It should be noted that various changes and modifications based on the inventive concept herein will occur to those skilled in the art and are intended to be included within the scope of the present invention. The starting materials used in the examples are all commercially available.
Example 1
Preparing a negative electrode material:
mixing natural crystalline flake graphite with potassium permanganate and 65 wt% concentrated nitric acid according to the mass ratio of 1: 0.2: 2, mixing, and carrying out oxidation intercalation, wherein the reaction temperature of the oxidation intercalation is 10 ℃, the time of the mixed oxidation intercalation is 30min, and magnetons are used for stirring during the oxidation intercalation reaction; after the oxidation intercalation is finished, naturally returning to the room temperature, filtering and separating out solids, washing the solids by using deionized water until the pH value of filtrate is 6-7, washing the solids twice by using absolute ethyl alcohol, feeding the solids into a vacuum drying oven for drying at the drying temperature of 60 ℃ for 12 hours, feeding the dried oxidation intercalation graphite into a horizontal tube furnace, and feeding the graphite into a high-purity N tube furnace2Puffing under protection, wherein the puffing temperature is 400 ℃, the heating rate is 10 ℃/min, and the heat preservation time is 10 min. Thus obtaining the micro-expanded graphite with the expansion multiple of about 2.5 times。
Preparing a positive plate:
adding 86 wt% of activated carbon powder, 6 wt% of conductive carbon black and 3 wt% of sodium carboxymethylcellulose (dispersing agent) into a planetary stirrer, adding 200 wt% of deionized water, and dispersing at the rotating speed of 40r/min for 240 min; adding 5 wt% of styrene butadiene rubber (binder) into a stirring tank, vacuumizing to-0.098 Mpa, and stirring at a rotating speed of 20r/min for 120min in vacuum; sieving the slurry with a 150-mesh sieve; coating the coating solution on the front and back surfaces of a 22-micron-thick perforated porous aluminum foil (with the aperture ratio of 40%) by using a transfer coater, coating the coating solution on one surface of the aluminum foil with the thickness of 100 microns (after drying), wherein the coating speed is 3m/min, and drying the aluminum foil in a forced air drying oven at the temperature of 90 ℃; and compacting the dried pole piece by using a roller press to obtain the positive pole piece.
Preparing a negative plate:
firstly, 150 wt% of deionized water is injected into a stirring dispersion machine, 2 wt% of sodium carboxymethylcellulose (dispersing agent) is added into a stirring tank, and the stirring is carried out for 90min at the rotating speed of 20 r/min; adding 90 wt% of micro-expanded graphite and 4 wt% of conductive carbon black into a stirring tank, fully wetting, vacuumizing to-0.098 Mpa, and stirring at 40r/min for 240 min; adding 4 wt% of styrene butadiene rubber (binder) into a stirring tank, vacuumizing to-0.098 Mpa, and stirring at a rotating speed of 20r/min for 120 min; sieving the slurry with a 150-mesh sieve; coating the surface and the back of a 9-micron-thick perforated porous copper foil (with an aperture ratio of 50%) by using a transfer coater, coating the surface and the back of the copper foil with a thickness of 60 microns on one side (after drying), and drying the copper foil in a blast drying oven at 90 ℃; and compacting the dried pole piece by using a roller press to obtain the negative pole piece.
Preparing a lithium ion capacitor:
cutting the positive and negative pole pieces into pieces of 50 × 30mm by a slitter, stacking the pieces in the order of diaphragm-negative pole piece-diaphragm-positive pole piece-diaphragm-negative pole piece … …, wherein the number of the negative pole pieces is 10, the number of the positive pole pieces is 9, welding the tabs of the positive and negative pole pieces, drying the pieces in a vacuum drying oven at 80 ℃ for 12h,then transferring the mixture into a vacuum glove box; and placing a lithium ion supply source at one end of the lamination, integrally moving the lamination into an aluminum-plastic soft package, injecting a proper amount of electrolyte, and carrying out laser sealing to obtain the soft-package square-piece type lithium ion capacitor. Wherein the adopted diaphragm is a polypropylene film, and the electrolyte is prepared from Ethylene Carbonate (EC): dimethyl carbonate (DMC)) in a volume ratio of 1: 1, lithium hexafluorophosphate (LiPF)6) The concentration of (2) is 1 mol/L.
And (3) performance testing:
the prepared lithium ion capacitor is subjected to electrochemical performance test for investigating the first charge-discharge performance and rate capability of the device and the charge-discharge cycle stability under high rate, and the steps are as follows: the assembled lithium ion capacitor is connected to an ArbinBT2000 battery tester, and after the lithium ion capacitor is firstly placed for about 12 hours, the lithium ion capacitor is charged to 3.8V according to the constant current of 0.5C multiplying power, then the lithium ion capacitor is charged at the constant voltage of 3.8V for 5 minutes, the lithium ion capacitor is discharged to 2.2V according to the constant current, and the steps are repeated to test the capacitor. Wherein, the charging and discharging current used in the test of the cycle performance is 5C, and the test items and results are shown in Table 1.
Example 2
Mixing spherical graphite with potassium permanganate and FeCl365 wt% concentrated nitric acid and acetic anhydride in a mass ratio of 1: 0.4:0.05: 2:3, mixing, and carrying out oxidation intercalation, wherein the reaction temperature of the oxidation intercalation is 25 ℃, and the oxidation intercalation time after mixing is 60 min; stirring by utilizing magnetons during the oxidation intercalation reaction; after the oxidation intercalation is finished, naturally returning to the room temperature, filtering and separating out solids, washing the solids by using deionized water until the pH value of filtrate is 6-7, and then washing the solids twice by using absolute ethyl alcohol; the solid is sent into a vacuum drying oven for drying, the drying temperature is 70 ℃, and the drying time is 6 hours; and feeding the dried oxidized intercalated graphite into a horizontal tube furnace, and puffing under the protection of high-purity Ar at the puffing temperature of 600 ℃, the heating rate of 10 ℃/min and the heat preservation time of 5 min. Thus obtaining the micro-expanded graphite with expansion times of about 5 times.
The methods for preparing the positive electrode sheet and the negative electrode sheet and the lithium ion capacitor are the same as in example 1.
Example 3
Spherical graphite, potassium permanganate, perchloric acid and 98 wt% concentrated phosphoric acid are mixed according to the mass ratio of 1: 0.6: 2: 2, mixing, wherein the reaction temperature of the oxidation intercalation is 40 ℃, the oxidation intercalation time after mixing is 120min, and stirring by using a PTFE stirring paddle during the oxidation intercalation reaction; after the oxidation intercalation is finished, naturally returning to the room temperature, filtering and separating out solids, washing the solids by using deionized water until the pH value of filtrate is 6-7, and then washing the solids twice by using absolute ethyl alcohol; the solid is sent into a vacuum drying oven for drying, the drying temperature is 60 ℃, and the drying time is 8 hours; feeding the dried oxidized intercalated graphite into a horizontal tube furnace to obtain high-purity N2Puffing under protection, wherein the puffing temperature is 650 deg.C, the heating rate is 10 deg.C/min, and the holding time is 1 min. Thus obtaining the micro-expanded graphite with the expansion multiple of about 4 times.
The preparation methods of the positive electrode plate and the negative electrode plate, the preparation method of the lithium ion capacitor and the detection method are the same as those of example 1, and the results are shown in table 1.
Example 4
Mixing artificial graphite, hydrogen peroxide and 65 wt% concentrated nitric acid according to the mass ratio of 1: 0.5: 5, mixing, wherein the reaction temperature of the oxidation intercalation is 25 ℃, the oxidation intercalation time after mixing is 60min, and stirring by using a glass rod during the oxidation intercalation reaction; after the oxidation intercalation is finished, naturally returning to the room temperature, filtering and separating out solids, washing the solids by using deionized water until the pH value of filtrate is 6-7, and then washing the solids twice by using absolute ethyl alcohol; the solid is sent into a vacuum drying oven for drying, the drying temperature is 60 ℃, and the drying time is 6 hours; and feeding the dried oxidized intercalated graphite into a horizontal tube furnace, and puffing under the protection of high-purity Ar at the puffing temperature of 650 ℃, the heating rate of 10 ℃/min and the heat preservation time of 1 min. Thus obtaining the micro-expanded graphite with the expansion multiple of about 2 times.
The preparation methods of the positive electrode plate and the negative electrode plate, the preparation method of the lithium ion capacitor and the detection method are the same as those of example 1, and the results are shown in table 1.
Comparative example
The preparation methods of the positive electrode sheet and the negative electrode sheet, the preparation method of the lithium ion capacitor, and the detection method were the same as in example 1 except that the negative electrode active material was spheroidal graphite which was not subjected to the micro-expansion treatment, and the results are shown in table 1.
As can be seen from the test results of examples 1-4 and comparative example, the specific volume in each example can reach as high as 92.6F, which is higher than that in comparative example 46.8%; compared with the comparative example, the energy density and the capacity retention rate after 1000 times of circulation are improved to different degrees. Therefore, the energy density, the power density and the cycling stability of the lithium ion capacitor adopting the micro-expansion graphite cathode material are all superior to those of the lithium ion capacitor adopting the graphite material as the cathode.
Claims (5)
1. A preparation method of a micro-expanded graphite negative electrode material is characterized by comprising the following steps: mixing a battery-grade powder graphite material, an oxidant and an intercalator according to the mass ratio of 1:0.2-0.6:2-5, carrying out oxidation intercalation for 30-60min at the temperature of 10-40 ℃, filtering and separating out solids at room temperature, washing the solids until the pH value of filtrate is 6-7, drying, then sending into a horizontal tube furnace, expanding for 1-10min at the temperature of 400-; wherein,
the powder graphite material is selected from natural crystalline flake graphite, spherical graphite or artificial graphite;
the oxidant is selected from potassium permanganate, ferric trichloride or hydrogen peroxide;
the intercalating agent is selected from concentrated nitric acid, perchloric acid, concentrated phosphoric acid, formic acid, acetic anhydride, propionic acid or oxalic acid;
the temperature rise rate of the expansion is 5-20 ℃/min.
2. The process according to claim 1, wherein the reaction system is stirred during the oxidative intercalation.
3. The production method according to claim 2, wherein the solid is washed to a filtrate pH of 6-7, and then the solid is washed with absolute ethanol and dried.
4. The method according to any one of claims 1, 2 and 3, wherein the drying is vacuum drying at a temperature of 60-70 ℃; the vacuum drying time is 6-12 h.
5. The method according to any one of claims 1, 2 and 3, wherein the temperature increase rate of the puffing is 10 ℃/min.
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| CN104466182A (en) * | 2014-12-15 | 2015-03-25 | 上海第二工业大学 | Nitrogen-doped nanocarbon coated/oxidized modified graphite composite material and preparation method thereof |
| CN104828818B (en) * | 2015-05-27 | 2017-08-25 | 北京鼎臣超导科技有限公司 | The efficient intercalation stripping means and low order graphite intercalation compound and micron thin-walled porous expanded graphite of a kind of micron graphite thin slice |
| CN105502360B (en) * | 2015-12-25 | 2018-04-06 | 燕山大学 | A kind of preparation method of expandable sulfur-free graphite |
| CN107500286A (en) * | 2017-09-30 | 2017-12-22 | 湖南国盛石墨科技有限公司 | Micro crystal graphite bulking process |
| CN107919477B (en) * | 2017-12-22 | 2020-10-09 | 湖南工业大学 | Application of mixed expanded graphite as negative electrode material of lithium ion battery |
| CN108017054B (en) * | 2017-12-22 | 2021-05-14 | 湖南工业大学 | Method for preparing mixed expanded graphite from microcrystalline graphite and flake graphite |
| CN108217640B (en) * | 2018-01-09 | 2021-03-23 | 江西理工大学 | Preparation method of negative electrode of lithium ion battery capable of being used for quick charging |
| CN109524623B (en) * | 2018-11-16 | 2021-07-20 | 山东华亿比科新能源股份有限公司 | Preparation method of anti-bending negative plate of lithium battery |
| CN109616668A (en) * | 2018-12-06 | 2019-04-12 | 中国科学院兰州化学物理研究所 | The micro- preparation method for expanding layer natural graphite of lithium cell negative pole material manganese oxide-small size |
| CN109742356A (en) * | 2018-12-29 | 2019-05-10 | 湖南中科星城石墨有限公司 | A kind of preparation method of graphite cathode material |
| CN110429265B (en) * | 2019-08-13 | 2021-02-02 | 四川轻化工大学 | MEG/Si/C composite negative electrode material for lithium ion battery and preparation method thereof |
| CN110548485B (en) * | 2019-09-05 | 2021-02-26 | 中南大学 | Modified waste cathode carbon material and preparation and application methods thereof |
| CN112374552B (en) * | 2020-11-12 | 2023-08-01 | 昆明云大新能源有限公司 | Composite modified graphite negative electrode material and preparation method thereof |
| CN113511651B (en) * | 2021-09-09 | 2021-11-26 | 成都特隆美储能技术有限公司 | Preparation method of polypyrrole-modified micro-oxidation expanded graphite negative electrode material |
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