CN115304047B - 原子级原位碳包覆氟磷酸亚铁钠复合材料及其制备和应用 - Google Patents
原子级原位碳包覆氟磷酸亚铁钠复合材料及其制备和应用 Download PDFInfo
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- CN115304047B CN115304047B CN202110500203.7A CN202110500203A CN115304047B CN 115304047 B CN115304047 B CN 115304047B CN 202110500203 A CN202110500203 A CN 202110500203A CN 115304047 B CN115304047 B CN 115304047B
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 30
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 30
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 title claims abstract description 24
- 238000011065 in-situ storage Methods 0.000 title claims abstract description 20
- 238000002360 preparation method Methods 0.000 title claims abstract description 16
- 239000002131 composite material Substances 0.000 title claims abstract description 15
- BFDWBSRJQZPEEB-UHFFFAOYSA-L sodium fluorophosphate Chemical compound [Na+].[Na+].[O-]P([O-])(F)=O BFDWBSRJQZPEEB-UHFFFAOYSA-L 0.000 title description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 46
- 239000000463 material Substances 0.000 claims abstract description 39
- 239000011734 sodium Substances 0.000 claims abstract description 39
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims abstract description 32
- 229910052708 sodium Inorganic materials 0.000 claims abstract description 32
- 238000000034 method Methods 0.000 claims abstract description 29
- 229920005862 polyol Polymers 0.000 claims abstract description 25
- 150000003077 polyols Chemical class 0.000 claims abstract description 25
- 238000010438 heat treatment Methods 0.000 claims abstract description 21
- 229910052742 iron Inorganic materials 0.000 claims abstract description 21
- DWYMPOCYEZONEA-UHFFFAOYSA-L fluoridophosphate Chemical compound [O-]P([O-])(F)=O DWYMPOCYEZONEA-UHFFFAOYSA-L 0.000 claims abstract description 20
- 238000001354 calcination Methods 0.000 claims abstract description 14
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 claims abstract description 11
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims abstract description 11
- 239000011737 fluorine Substances 0.000 claims abstract description 11
- 229910052731 fluorine Inorganic materials 0.000 claims abstract description 11
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 11
- 239000011574 phosphorus Substances 0.000 claims abstract description 11
- 239000002243 precursor Substances 0.000 claims abstract description 11
- FKNQFGJONOIPTF-UHFFFAOYSA-N Sodium cation Chemical compound [Na+] FKNQFGJONOIPTF-UHFFFAOYSA-N 0.000 claims abstract description 10
- 229910001415 sodium ion Inorganic materials 0.000 claims abstract description 10
- 239000012298 atmosphere Substances 0.000 claims abstract description 7
- 230000001681 protective effect Effects 0.000 claims abstract description 6
- 239000012456 homogeneous solution Substances 0.000 claims abstract description 4
- 239000007788 liquid Substances 0.000 claims abstract description 3
- 238000000926 separation method Methods 0.000 claims abstract description 3
- MTHSVFCYNBDYFN-UHFFFAOYSA-N diethylene glycol Chemical compound OCCOCCO MTHSVFCYNBDYFN-UHFFFAOYSA-N 0.000 claims description 18
- 238000003756 stirring Methods 0.000 claims description 12
- 230000008569 process Effects 0.000 claims description 9
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 claims description 8
- VCJMYUPGQJHHFU-UHFFFAOYSA-N iron(3+);trinitrate Chemical compound [Fe+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O VCJMYUPGQJHHFU-UHFFFAOYSA-N 0.000 claims description 8
- PUZPDOWCWNUUKD-UHFFFAOYSA-M sodium fluoride Chemical compound [F-].[Na+] PUZPDOWCWNUUKD-UHFFFAOYSA-M 0.000 claims description 8
- 239000000203 mixture Substances 0.000 claims description 5
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 4
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 claims description 4
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 4
- VMHLLURERBWHNL-UHFFFAOYSA-M Sodium acetate Chemical compound [Na+].CC([O-])=O VMHLLURERBWHNL-UHFFFAOYSA-M 0.000 claims description 4
- LFVGISIMTYGQHF-UHFFFAOYSA-N ammonium dihydrogen phosphate Chemical compound [NH4+].OP(O)([O-])=O LFVGISIMTYGQHF-UHFFFAOYSA-N 0.000 claims description 4
- 229910000387 ammonium dihydrogen phosphate Inorganic materials 0.000 claims description 4
- MNNHAPBLZZVQHP-UHFFFAOYSA-N diammonium hydrogen phosphate Chemical compound [NH4+].[NH4+].OP([O-])([O-])=O MNNHAPBLZZVQHP-UHFFFAOYSA-N 0.000 claims description 4
- BNIILDVGGAEEIG-UHFFFAOYSA-L disodium hydrogen phosphate Chemical compound [Na+].[Na+].OP([O-])([O-])=O BNIILDVGGAEEIG-UHFFFAOYSA-L 0.000 claims description 4
- 239000001257 hydrogen Substances 0.000 claims description 4
- 229910052739 hydrogen Inorganic materials 0.000 claims description 4
- 235000019837 monoammonium phosphate Nutrition 0.000 claims description 4
- NROKBHXJSPEDAR-UHFFFAOYSA-M potassium fluoride Chemical compound [F-].[K+] NROKBHXJSPEDAR-UHFFFAOYSA-M 0.000 claims description 4
- 235000013024 sodium fluoride Nutrition 0.000 claims description 4
- 239000011775 sodium fluoride Substances 0.000 claims description 4
- 239000006012 monoammonium phosphate Substances 0.000 claims description 3
- 150000005846 sugar alcohols Polymers 0.000 claims description 3
- FPFSGDXIBUDDKZ-UHFFFAOYSA-N 3-decyl-2-hydroxycyclopent-2-en-1-one Chemical compound CCCCCCCCCCC1=C(O)C(=O)CC1 FPFSGDXIBUDDKZ-UHFFFAOYSA-N 0.000 claims description 2
- DDFHBQSCUXNBSA-UHFFFAOYSA-N 5-(5-carboxythiophen-2-yl)thiophene-2-carboxylic acid Chemical compound S1C(C(=O)O)=CC=C1C1=CC=C(C(O)=O)S1 DDFHBQSCUXNBSA-UHFFFAOYSA-N 0.000 claims description 2
- 239000004254 Ammonium phosphate Substances 0.000 claims description 2
- 239000005696 Diammonium phosphate Substances 0.000 claims description 2
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 claims description 2
- 229910021578 Iron(III) chloride Inorganic materials 0.000 claims description 2
- UIIMBOGNXHQVGW-DEQYMQKBSA-M Sodium bicarbonate-14C Chemical compound [Na+].O[14C]([O-])=O UIIMBOGNXHQVGW-DEQYMQKBSA-M 0.000 claims description 2
- 229910000147 aluminium phosphate Inorganic materials 0.000 claims description 2
- 229910000148 ammonium phosphate Inorganic materials 0.000 claims description 2
- 235000019289 ammonium phosphates Nutrition 0.000 claims description 2
- 229910052786 argon Inorganic materials 0.000 claims description 2
- 229910000388 diammonium phosphate Inorganic materials 0.000 claims description 2
- 235000019838 diammonium phosphate Nutrition 0.000 claims description 2
- 229910000040 hydrogen fluoride Inorganic materials 0.000 claims description 2
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 claims description 2
- RUTXIHLAWFEWGM-UHFFFAOYSA-H iron(3+) sulfate Chemical compound [Fe+3].[Fe+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O RUTXIHLAWFEWGM-UHFFFAOYSA-H 0.000 claims description 2
- PVFSDGKDKFSOTB-UHFFFAOYSA-K iron(3+);triacetate Chemical compound [Fe+3].CC([O-])=O.CC([O-])=O.CC([O-])=O PVFSDGKDKFSOTB-UHFFFAOYSA-K 0.000 claims description 2
- 229910000360 iron(III) sulfate Inorganic materials 0.000 claims description 2
- 229910000403 monosodium phosphate Inorganic materials 0.000 claims description 2
- 235000019799 monosodium phosphate Nutrition 0.000 claims description 2
- 229910052757 nitrogen Inorganic materials 0.000 claims description 2
- 235000011007 phosphoric acid Nutrition 0.000 claims description 2
- 235000003270 potassium fluoride Nutrition 0.000 claims description 2
- 239000011698 potassium fluoride Substances 0.000 claims description 2
- 239000001632 sodium acetate Substances 0.000 claims description 2
- 235000017281 sodium acetate Nutrition 0.000 claims description 2
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 2
- 235000017550 sodium carbonate Nutrition 0.000 claims description 2
- AJPJDKMHJJGVTQ-UHFFFAOYSA-M sodium dihydrogen phosphate Chemical compound [Na+].OP(O)([O-])=O AJPJDKMHJJGVTQ-UHFFFAOYSA-M 0.000 claims description 2
- 229910000397 disodium phosphate Inorganic materials 0.000 claims 1
- 235000019800 disodium phosphate Nutrition 0.000 claims 1
- 239000007774 positive electrode material Substances 0.000 claims 1
- 239000001488 sodium phosphate Substances 0.000 claims 1
- 239000002245 particle Substances 0.000 abstract description 6
- 238000006243 chemical reaction Methods 0.000 abstract description 3
- 230000000052 comparative effect Effects 0.000 description 21
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 8
- 229910001416 lithium ion Inorganic materials 0.000 description 7
- 238000010992 reflux Methods 0.000 description 7
- 238000010899 nucleation Methods 0.000 description 6
- 230000006911 nucleation Effects 0.000 description 6
- 239000000047 product Substances 0.000 description 6
- 238000000576 coating method Methods 0.000 description 5
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 4
- 239000013078 crystal Substances 0.000 description 4
- 230000002349 favourable effect Effects 0.000 description 4
- 238000005245 sintering Methods 0.000 description 4
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 3
- 210000004027 cell Anatomy 0.000 description 3
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 3
- 229910052744 lithium Inorganic materials 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- CIWBSHSKHKDKBQ-JLAZNSOCSA-N Ascorbic acid Chemical compound OC[C@H](O)[C@H]1OC(=O)C(O)=C1O CIWBSHSKHKDKBQ-JLAZNSOCSA-N 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- 229940040526 anhydrous sodium acetate Drugs 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 235000011187 glycerol Nutrition 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 238000007709 nanocrystallization Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 239000000376 reactant Substances 0.000 description 2
- 238000003980 solgel method Methods 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- WQZGKKKJIJFFOK-GASJEMHNSA-N Glucose Natural products OC[C@H]1OC(O)[C@H](O)[C@@H](O)[C@@H]1O WQZGKKKJIJFFOK-GASJEMHNSA-N 0.000 description 1
- 102000004310 Ion Channels Human genes 0.000 description 1
- 239000002033 PVDF binder Substances 0.000 description 1
- KEAYESYHFKHZAL-UHFFFAOYSA-N Sodium Chemical group [Na] KEAYESYHFKHZAL-UHFFFAOYSA-N 0.000 description 1
- 238000002441 X-ray diffraction Methods 0.000 description 1
- 239000013543 active substance Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical group [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 239000006183 anode active material Substances 0.000 description 1
- 239000012300 argon atmosphere Substances 0.000 description 1
- 239000011668 ascorbic acid Substances 0.000 description 1
- 229960005070 ascorbic acid Drugs 0.000 description 1
- 235000010323 ascorbic acid Nutrition 0.000 description 1
- 238000000498 ball milling Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- WQZGKKKJIJFFOK-VFUOTHLCSA-N beta-D-glucose Chemical compound OC[C@H]1O[C@@H](O)[C@H](O)[C@@H](O)[C@@H]1O WQZGKKKJIJFFOK-VFUOTHLCSA-N 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000013522 chelant Substances 0.000 description 1
- 230000009920 chelation Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000009831 deintercalation Methods 0.000 description 1
- 239000008367 deionised water Substances 0.000 description 1
- 229910021641 deionized water Inorganic materials 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 125000001153 fluoro group Chemical group F* 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 239000008103 glucose Substances 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 238000005342 ion exchange Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 229920002981 polyvinylidene fluoride Polymers 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000001878 scanning electron micrograph Methods 0.000 description 1
- BAZAXWOYCMUHIX-UHFFFAOYSA-M sodium perchlorate Chemical compound [Na+].[O-]Cl(=O)(=O)=O BAZAXWOYCMUHIX-UHFFFAOYSA-M 0.000 description 1
- 229910001488 sodium perchlorate Inorganic materials 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229910052723 transition metal Inorganic materials 0.000 description 1
- 150000003624 transition metals Chemical class 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B25/00—Phosphorus; Compounds thereof
- C01B25/16—Oxyacids of phosphorus; Salts thereof
- C01B25/26—Phosphates
- C01B25/455—Phosphates containing halogen
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B32/00—Carbon; Compounds thereof
- C01B32/05—Preparation or purification of carbon not covered by groups C01B32/15, C01B32/20, C01B32/25, C01B32/30
-
- 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
- H01M10/054—Accumulators with insertion or intercalation of metals other than lithium, e.g. with magnesium or aluminium
-
- 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
- H01M4/362—Composites
- H01M4/366—Composites as layered products
-
- 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
- H01M4/582—Halogenides
-
- 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
- H01M4/5825—Oxygenated metallic salts or polyanionic structures, e.g. borates, phosphates, silicates, olivines
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
- H01M4/624—Electric conductive fillers
- H01M4/625—Carbon or graphite
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2002/00—Crystal-structural characteristics
- C01P2002/70—Crystal-structural characteristics defined by measured X-ray, neutron or electron diffraction data
- C01P2002/72—Crystal-structural characteristics defined by measured X-ray, neutron or electron diffraction data by d-values or two theta-values, e.g. as X-ray diagram
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/01—Particle morphology depicted by an image
- C01P2004/03—Particle morphology depicted by an image obtained by SEM
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- C01P2004/60—Particles characterised by their size
- C01P2004/62—Submicrometer sized, i.e. from 0.1-1 micrometer
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- H01M2004/021—Physical characteristics, e.g. porosity, surface area
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- 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
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Abstract
本发明属于钠离子电池技术领域,具体公开了一种原子级原位碳包覆氟磷酸亚铁钠复合材料的制备方法,将含有铁源、磷源、氟源、钠源、多元醇的均相溶液在250~300℃的温度下进行热处理12~48h,随后经固液分离,获得前驱体;所述的多元醇含有两个及以上的醇羟基,且总碳数为2~6;多元醇相对于铁源中的铁的摩尔比为8~12:1;将前驱体在保护气氛下、500~750℃的温度下进行煅烧处理,获得所述的材料。本发明还包含所述的制备方法制得的材料以及在钠离子电池中的应用。本发明方法可有效地控制产物的形貌,还能提高化学反应的动力学,以获得粒径更小、形貌更均一、电化学性能更优异的碳包覆氟磷酸亚铁钠复合材料。
Description
技术领域:
本发明属于电池材料技术领域,具体涉及一种钠离子电池正极活性材料技术领域。
背景技术:
锂离子电池由于具有高能量密度、高稳定性、长寿命等优势,已经迅速占据便携式电子产品市场,并不断向电动交通工具领域渗入。但是,锂资源在地壳中储量低,并且地域分布不均,使得锂离子电池在大范围推广应用的过程中引起锂价不断攀升,导致锂离子电池价格居高不下。因此,锂离子电池在大规模储电领域的应用受到限制。钠与锂属同一主族,具有一定相似的物理化学性质,但钠元素的半径较锂元素大,许多锂离子电池适用的材料以及材料构建理论在钠离子电池领域难于适用,难于获得同锂离子电池相似的技术效果,这就是为什么锂离子电池已经广泛使用而钠离子电池未获得广泛商用的主要原因。
Nazar等最早提出了Na2FePO4F材料,该材料被视为3.5V(vs.Li+/Li)的锂钠混合电池正极材料使用,可以实现一个Na+的脱嵌。它的骨架结构显现出独有的特点,双八面体[Fe2O7F2]单元由共面的FeO4F2正八面体组成,同时由F原子连接成链状,且与PO4四面体连接形成层,拥有容易扩散的二维离子通道。其在Na+离子脱嵌过程中表现为平滑的斜坡行为(约0.6Na)电位平台在3.0V,同时晶胞体积变化率为3.7%,然而此种材料高倍率下循环性能较差,有待更进一步的研究。
为了进一步提高其电化学性能,可以通过设计一种更有效的碳包覆方法以提高电子电导率和减小颗粒粒径以缩短离子迁移路径。然而,现有的研究中,大多数都是以柠檬酸、葡萄糖和抗坏血酸等作为碳源,包覆方法以溶胶凝胶法和球磨法为主。现有方法制得的碳层的厚度较厚,且颗粒均匀性较差,材料的倍率以及循环稳定性均有待进一步提高。
发明内容:
针对现有技术的问题,本发明提供了一种原子级原位碳包覆氟磷酸亚铁钠复合材料的制备方法,旨在提供一种能够有效控制材料成核行为,并对氟磷酸亚铁钠实现原子级碳层原位包覆的方法。
本发明第二目的在于,提供一种所述的制备方法制得的原子级原位碳包覆氟磷酸亚铁钠复合材料。
本发明第三目的在于,提供一种所述的原子级原位碳包覆氟磷酸亚铁钠复合材料在钠离子电池中的应用。
现有氟磷酸亚铁钠的碳包覆手段通常是通过溶胶-凝胶方法或者通过聚合方式在前驱体上形成碳层,并进一步碳化,该方法制备的材料的碳层不均匀,且碳层厚度比较大,不仅如此,颗粒的均匀性不理想,材料的倍率、循环稳定性等性能不理想,针对该技术问题,本发明提供了以下全新方案,主要在于:
一种原子级原位碳包覆氟磷酸亚铁钠复合材料的制备方法,包括以下步骤:
步骤(1):
将含有铁源、磷源、氟源、钠源、多元醇的均相溶液在250~300℃的温度下进行热处理12~48h,随后经固液分离,获得前驱体;所述的多元醇含有两个及以上的醇羟基,且总碳数为2~6;多元醇相对于铁源中的铁的摩尔比为8~12:1;
步骤(2):将前驱体在保护气氛下、500~750℃的温度下进行煅烧处理,获得所述的材料。
本发明中,创新地将铁源、磷源、氟源、钠源溶解在多元醇溶液中,形成均相溶液,并在多元醇的体系中进行所要求条件下的热处理,如此,能够基于多元醇的螯合机制以及体系高粘度特性,有助于控制成核行为,控制晶胞结构以及材料形貌均匀性,此外,还在晶胞表面均匀化学修饰多元醇,将该前驱体进一步配合后续所要求条件下的煅烧处理,有助于原位形成原子级厚度的碳包覆结构。研究发现,该制备方法工艺步骤简单,成本低,制得的产物粒径均匀,纯度高,电化学性能佳;具有更优的倍率以及循环稳定性。
针对氟磷酸亚铁制备过程存在的倍率以及循环稳定性不理想的问题,本发明创新地发现,采用多元醇对所合成的原料进行均相纳米化,并在其体系下进行可控的成核以及表面原位修饰,进一步结合各条件的协同控制,如此有助于获得均匀形貌、良好晶相结构和纯度,且具有原子级原位碳包覆结构、具有优异倍率性能的材料。
本发明中,在多元醇均相纳米化-可控成核的前提下,进一步对铁源、磷源、氟源、钠源、多元醇的种类、比例、热处理方式以及后续的煅烧工艺的联合控制,能够意外地进一步利于改善材料的电化学形貌以及晶体结构,有助于进一步改善材料的倍率以及循环稳定性。
作为优选,所述的多元醇为二甘醇、甘油中的至少一种。研究发现,采用优选的多元醇,有助于进一步利于铁源、磷源、氟源、钠源的溶解、均相纳米化,且具有更合适的粘度、原料螯合能力以及原位还原能力,有助于进一步影响反应动力学,利于晶核的控制以及原子级碳层的原位生成。
优选地,所述的铁源为氯化铁、硝酸铁、醋酸铁、硫酸铁、硫酸铁铵等其中的一种或多种。
优选地,所述的磷源为磷酸、磷酸二氢铵、磷酸氢二铵、磷酸氢二钠、磷酸铵等其中的一种或者多种。
优选地,氟源为氟化钠、氟化铵、氟化氢或氟化钾的一种或多种。
优选地,钠源为碳酸钠、碳酸氢钠、醋酸钠、磷酸二氢钠和磷酸氢二钠的一种或多种。
铁源、磷源、氟源、钠源按Fe:P:F:Na摩尔比为1:1:1.2~1:2~2.2配料。
本发明研究发现,控制所述的多元醇的用量,有助于进一步利于材料的制备,有助于意外地进一步改善材料的倍率性能。
作为优选,多元醇相对于铁源中的铁的摩尔比为10~12:1。
本发明中,热处理过程在敞口条件下进行。在热处理过程中,可以设置溶剂回流冷凝装置。
研究发现,在所述的多元醇体系、比例下,进一步配合热处理的温度和时间,有助于进一步改善制得的材料的倍率性能。
作为优选,步骤(1)中,热处理的温度为250~270℃。
作为优选,热处理反应时间为12~48h。
步骤(1)中,热处理过程中的搅拌速率为100~2500rpm;进一步优选为500~800rpm。
本发明中,将热处理的产物进行洗涤处理,获得前驱体。
洗涤过程的溶剂例如为丙酮、乙醇、去离子水中的一种或者多种。
本发明中,将洗涤后的材料进行干燥后在保护性气氛下进行煅烧处理,获得目标产物。
作为优选,所述的保护性气氛为氮气,氩气,氮-氢混合气、氩-氢混合气中的一种或多种。
本发明中,在创新地前驱体制备前提下,进一步配合煅烧处理温度的控制,能够
作为优选,步骤(2)中,煅烧过程的温度为500~600℃;
优选地,煅烧时间为1~24h,煅烧升温速率为1~30℃/min。
本发明优选的制备方法,其步骤如下:
(1)将无机铁源、磷源溶于多元醇,充分搅拌均匀后,分别加入氟源、钠源,充分搅拌均匀;搅拌速率为60~2500rpm,搅拌时间为0.1~5h;
(2)将(1)中的溶液置带有回流冷凝器的装置中,在一定的温度下连续强力搅拌回流;冷凝回流温度为250~300℃,搅拌速率为100~2500rpm,冷凝回流的时间为12~48h;
(3)将(2)中得到的沉淀物用进行抽滤、分离烘干后得到非晶态的原位碳包覆的Na2FePO4F@C;后在惰性气体气氛下高温煅烧即可得到本文所述的原位碳包覆氟磷酸亚铁钠复合材料。
有益效果
对于氟磷酸亚铁钠制备而言,本发明创新地在多元醇体系下,通过离子交换法制备碳包覆氟磷酸亚铁钠复合材料,其优势在于高沸点和高粘度的多元醇有利于无机盐的溶解度,与过渡金属形成螯合配合物的强烈倾向,具有较强的还原能力,氟磷酸亚铁钠颗粒是由溶解的前驱体溶液通过成核和晶体生长过程形成的,因此能有效地控制产物形貌,同时提高其电化学性能,且该方法工艺步骤简单,成本低。
附图说明
图1为氟磷酸亚铁钠的XRD图;
图2为氟磷酸亚铁钠的SEM图;
图3为实施例1制得的材料的倍率图;
图4为实施例2制得的材料的倍率图;
图5为实施例3制得的材料的倍率图;
图6为实施例4制得的材料的倍率图;
图7为实施例5制得的材料的倍率图;
图8为实施例6制得的材料的倍率图;
图9为实施例7制得的材料的倍率图;
图10为实施例8制得的材料的倍率图;
图11为对比例1制得的材料的倍率图;
图12为对比例2制得的材料的倍率图;
图13为对比例3制得的材料的倍率图;
图14为对比例4制得的材料的倍率图;
图15为对比例5制得的材料的倍率图;
图16为对比例6制得的材料的倍率图;
图17为对比例7制得的材料的倍率图。
具体实施方式
实施例1:
(1)将硝酸铁(0.05moL)、磷酸二氢铵、无水乙酸钠和氟化钠按照摩尔比1:1:1:1的比例(各元素按化学计量比混料)加入二甘醇(二甘醇和Fe的摩尔比为10:1)中,以500rpm的搅拌速率下搅拌2小时,得到均匀溶液(澄清溶液);
(2)将(1)中获得的溶液置于带有冷凝回流装置的装置(敞口冷凝装置)中,在270℃下回流(热处理)搅拌12小时,搅拌速率为300rpm,然后将反应物用丙酮洗涤三次后放进120℃烘箱烘干12小时,取出研磨成细粉;
(3)在氩气气氛下,以5℃/min的速率升温至600℃保温12小时后得到原位碳包覆氟磷酸亚铁钠复合材料。
实施例2:
与实施例1对比,区别仅在于,步骤(1)中,硝酸铁、磷酸二氢铵、无水乙酸钠和氟化钠摩尔比为1:1:0.8:1.2。
实施例3:
与实施例1对比,区别仅在于,步骤(1)中,多元醇为甘油。
实施例4:
与实施例1对比,区别仅在于,步骤(2)中,热处理温度为300℃。
实施例5:
与实施例1对比,区别仅在于,步骤(2)中,热处理温度为250℃。
实施例6:
与实施例1对比,区别仅在于,步骤(1)中,二甘醇和Fe的摩尔比为12:1。
实施例7:
与实施例1对比,区别仅在于,步骤(3)中,烧结温度为500℃。
实施例8:
与实施例1对比,区别仅在于,步骤(3)中,烧结温度为750℃。
对比例1:
与实施例1对比,区别仅在于,步骤(1)中,采用等摩尔量的水替换二甘醇。
对比例2:
与实施例1对比,区别仅在于,步骤(1)中,多元醇:铁的摩尔比为5:1。
对比例3:
与实施例1对比,区别仅在于,步骤(1)中,多元醇:铁的摩尔比为15:1。
对比例4:
与实施例1对比,区别仅在于,步骤(2)中,热处理温度为200℃。
对比例5:
与实施例1对比,区别仅在于,步骤(2)中,热处理时间为8h。
对比例6:
与实施例1对比,区别仅在于,步骤(3)中,烧结温度为450℃。
对比例7:
与实施例1对比,区别仅在于,步骤(3)中,烧结温度为800℃。
测试主要步骤为:
(1)利用2032型号的电池壳,正极为制备的氟磷酸亚铁钠的极片(集流体为铝箔,活性物质:导电碳:PVDF=7:2:1),负极为钠金属,利用纤维隔膜(型号Whatman Grade GF/D),电解液为1M NaClO4(纯PC+5%FEC)装电池;
(2)静置时间为12h,设定一个倍率充电的程序,倍率为0.1C/1C/5C/10C/20C/50C,电压区间为2.0V-4.0V;
(3)氟磷酸亚铁钠的理论比容量的值124mAh/g;
测试结果见表1所示:
0.1C下的放电容量(mAh/g) | 50C下的放电容量(mAh/g) | |
实施例1 | 117.1 | 87.3 |
实施例2 | 116.7 | 77.3 |
实施例3 | 115.3 | 78.9 |
实施例4 | 112.9 | 68.9 |
实施例5 | 110.8 | 70.4 |
实施例6 | 113.6 | 73.9 |
实施例7 | 115.7 | 80.1 |
实施例8 | 109.1 | 76.5 |
对比例1 | 75.9 | 20.1 |
对比例2 | 90.2 | 56.1 |
对比例3 | 87.3 | 52.6 |
对比例4 | 70.1 | 21.8 |
对比例5 | 80.9 | 30.6 |
对比例6 | 78.9 | 45.7 |
对比例7 | 69.1 | 19.5 |
本发明研究发现,在所述的多元醇下,基于所述的预反应-热处理-煅烧下,进一步配合成分比例、温度的联合控制,能够意外地实现协同,改善材料的成核行为,改善材料的库伦效率。
Claims (15)
1.一种用于制备钠离子电池的原子级原位碳包覆氟磷酸亚铁钠复合材料的制备方法,其特征在于,包括以下步骤:
步骤(1) :
将含有铁源、磷源、氟源、钠源、多元醇的均相溶液在250~300℃的温度下进行热处理12~48h,随后经固液分离,获得前驱体;
所述的多元醇为二甘醇、甘油中的至少一种;
多元醇相对于铁源中的铁的摩尔比为8~12:1;
步骤(2) :将前驱体在保护气氛下、500~750℃的温度下进行煅烧处理,获得所述的材料。
2.如权利要求1所述的制备方法,其特征在于,所述的铁源为氯化铁、硝酸铁、醋酸铁、硫酸铁、硫酸铁铵中的至少一种。
3.如权利要求1所述的制备方法,其特征在于,所述的磷源为磷酸、磷酸二氢铵、磷酸氢二铵、磷酸氢二钠、磷酸铵中的至少一种。
4.如权利要求1所述的制备方法,其特征在于,氟源为氟化钠、氟化铵、氟化氢或氟化钾中的至少一种。
5.如权利要求1所述的制备方法,其特征在于,钠源为碳酸钠、碳酸氢钠、醋酸钠、磷酸二氢钠和磷酸氢二钠中的至少一种。
6.如权利要求1所述的制备方法,其特征在于,铁源、磷源、氟源、钠源按Fe:P:F:Na摩尔比为1:1:1.2~1:2~2.2配料。
7.如权利要求1所述的制备方法,其特征在于,步骤(1)中,热处理的温度为250~270℃。
8.如权利要求1所述的制备方法,其特征在于,步骤(1)中,热处理过程中的搅拌速率为100~2500rpm。
9.如权利要求8所述的制备方法,其特征在于,步骤(1)中,热处理过程中的搅拌速率为500~800rpm。
10.如权利要求1所述的制备方法,其特征在于,步骤(2)中,所述的保护气氛为氮气、氩气、氮-氢混合气、氩-氢混合气中的一种或多种。
11.如权利要求1所述的制备方法,其特征在于,步骤(2)中,煅烧过程的温度为500~600℃。
12.如权利要求1所述的制备方法,其特征在于,煅烧时间为1~24h,煅烧升温速率为1~30℃/min。
13.一种权利要求1~12任一项所述制备方法制得的原子级原位碳包覆氟磷酸亚铁钠复合材料。
14.一种权利要求13所述的原子级原位碳包覆氟磷酸亚铁钠复合材料的应用,其特征在于,将其用于制备钠离子电池。
15.如权利要求14所述的原子级原位碳包覆氟磷酸亚铁钠复合材料的应用,其特征在于,将其用作钠离子电池的正极活性材料,用于制备钠离子电池。
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