WO2017164718A1 - 리튬이차전지 양극활물질의 제조 방법 및 이에 의하여 제조된 리튬이차전지 양극활물질 - Google Patents
리튬이차전지 양극활물질의 제조 방법 및 이에 의하여 제조된 리튬이차전지 양극활물질 Download PDFInfo
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- WO2017164718A1 WO2017164718A1 PCT/KR2017/003265 KR2017003265W WO2017164718A1 WO 2017164718 A1 WO2017164718 A1 WO 2017164718A1 KR 2017003265 W KR2017003265 W KR 2017003265W WO 2017164718 A1 WO2017164718 A1 WO 2017164718A1
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- WO
- WIPO (PCT)
- Prior art keywords
- nickel composite
- composite oxide
- lithium nickel
- active material
- metal oxide
- Prior art date
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 39
- 229910052744 lithium Inorganic materials 0.000 title abstract description 60
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title abstract description 59
- 239000007774 positive electrode material Substances 0.000 title abstract description 31
- 229910044991 metal oxide Inorganic materials 0.000 claims abstract description 27
- 150000004706 metal oxides Chemical class 0.000 claims abstract description 27
- 239000011248 coating agent Substances 0.000 claims abstract description 17
- 238000000576 coating method Methods 0.000 claims abstract description 17
- WMFOQBRAJBCJND-UHFFFAOYSA-M Lithium hydroxide Chemical compound [Li+].[OH-] WMFOQBRAJBCJND-UHFFFAOYSA-M 0.000 claims description 32
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 28
- 239000002131 composite material Substances 0.000 claims description 26
- RSNHXDVSISOZOB-UHFFFAOYSA-N lithium nickel Chemical compound [Li].[Ni] RSNHXDVSISOZOB-UHFFFAOYSA-N 0.000 claims description 23
- 150000001875 compounds Chemical class 0.000 claims description 18
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 16
- 239000012153 distilled water Substances 0.000 claims description 16
- 238000000034 method Methods 0.000 claims description 16
- 238000005406 washing Methods 0.000 claims description 15
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 12
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims description 12
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 claims description 12
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims description 12
- LRHPLDYGYMQRHN-UHFFFAOYSA-N N-Butanol Chemical compound CCCCO LRHPLDYGYMQRHN-UHFFFAOYSA-N 0.000 claims description 12
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 12
- 239000002245 particle Substances 0.000 claims description 12
- 150000002642 lithium compounds Chemical class 0.000 claims description 11
- 238000010438 heat treatment Methods 0.000 claims description 10
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 8
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 8
- YRKCREAYFQTBPV-UHFFFAOYSA-N acetylacetone Chemical compound CC(=O)CC(C)=O YRKCREAYFQTBPV-UHFFFAOYSA-N 0.000 claims description 8
- 229910052782 aluminium Inorganic materials 0.000 claims description 8
- 229910052698 phosphorus Inorganic materials 0.000 claims description 8
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 8
- -1 NH 4 OH Chemical compound 0.000 claims description 7
- 229910052749 magnesium Inorganic materials 0.000 claims description 7
- 229910052748 manganese Inorganic materials 0.000 claims description 7
- 238000002156 mixing Methods 0.000 claims description 7
- 229910052684 Cerium Inorganic materials 0.000 claims description 6
- ZMIGMASIKSOYAM-UHFFFAOYSA-N cerium Chemical compound [Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce] ZMIGMASIKSOYAM-UHFFFAOYSA-N 0.000 claims description 6
- 238000001035 drying Methods 0.000 claims description 5
- 229910052788 barium Inorganic materials 0.000 claims description 4
- RWCCWEUUXYIKHB-UHFFFAOYSA-N benzophenone Chemical compound C=1C=CC=CC=1C(=O)C1=CC=CC=C1 RWCCWEUUXYIKHB-UHFFFAOYSA-N 0.000 claims description 4
- 239000012965 benzophenone Substances 0.000 claims description 4
- 229910052796 boron Inorganic materials 0.000 claims description 4
- 229910052731 fluorine Inorganic materials 0.000 claims description 4
- 229910052759 nickel Inorganic materials 0.000 claims description 4
- 229910052712 strontium Inorganic materials 0.000 claims description 4
- 229910052719 titanium Inorganic materials 0.000 claims description 4
- 229910052726 zirconium Inorganic materials 0.000 claims description 4
- 229910052733 gallium Inorganic materials 0.000 claims description 3
- 229910052710 silicon Inorganic materials 0.000 claims description 3
- 238000011010 flushing procedure Methods 0.000 claims 1
- 230000000052 comparative effect Effects 0.000 description 27
- 239000006182 cathode active material Substances 0.000 description 22
- 239000002243 precursor Substances 0.000 description 16
- 239000011149 active material Substances 0.000 description 14
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 6
- 229910006020 NiCoAl Inorganic materials 0.000 description 6
- 238000000975 co-precipitation Methods 0.000 description 6
- 239000002019 doping agent Substances 0.000 description 6
- 238000003860 storage Methods 0.000 description 6
- 239000000243 solution Substances 0.000 description 5
- 229910000420 cerium oxide Inorganic materials 0.000 description 4
- BMMGVYCKOGBVEV-UHFFFAOYSA-N oxo(oxoceriooxy)cerium Chemical compound [Ce]=O.O=[Ce]=O BMMGVYCKOGBVEV-UHFFFAOYSA-N 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 239000011572 manganese Substances 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- 239000002002 slurry Substances 0.000 description 3
- QIVUCLWGARAQIO-OLIXTKCUSA-N (3s)-n-[(3s,5s,6r)-6-methyl-2-oxo-1-(2,2,2-trifluoroethyl)-5-(2,3,6-trifluorophenyl)piperidin-3-yl]-2-oxospiro[1h-pyrrolo[2,3-b]pyridine-3,6'-5,7-dihydrocyclopenta[b]pyridine]-3'-carboxamide Chemical compound C1([C@H]2[C@H](N(C(=O)[C@@H](NC(=O)C=3C=C4C[C@]5(CC4=NC=3)C3=CC=CN=C3NC5=O)C2)CC(F)(F)F)C)=C(F)C=CC(F)=C1F QIVUCLWGARAQIO-OLIXTKCUSA-N 0.000 description 2
- 229910012851 LiCoO 2 Inorganic materials 0.000 description 2
- 229910015643 LiMn 2 O 4 Inorganic materials 0.000 description 2
- 229910014689 LiMnO Inorganic materials 0.000 description 2
- 239000002033 PVDF binder Substances 0.000 description 2
- 229910010413 TiO 2 Inorganic materials 0.000 description 2
- 238000012512 characterization method Methods 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 239000003792 electrolyte Substances 0.000 description 2
- 239000000706 filtrate Substances 0.000 description 2
- 239000011888 foil Substances 0.000 description 2
- XULSCZPZVQIMFM-IPZQJPLYSA-N odevixibat Chemical compound C12=CC(SC)=C(OCC(=O)N[C@@H](C(=O)N[C@@H](CC)C(O)=O)C=3C=CC(O)=CC=3)C=C2S(=O)(=O)NC(CCCC)(CCCC)CN1C1=CC=CC=C1 XULSCZPZVQIMFM-IPZQJPLYSA-N 0.000 description 2
- 229920002981 polyvinylidene fluoride Polymers 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 230000008961 swelling Effects 0.000 description 2
- 229910052723 transition metal Inorganic materials 0.000 description 2
- 150000003624 transition metals Chemical class 0.000 description 2
- HFGHRUCCKVYFKL-UHFFFAOYSA-N 4-ethoxy-2-piperazin-1-yl-7-pyridin-4-yl-5h-pyrimido[5,4-b]indole Chemical compound C1=C2NC=3C(OCC)=NC(N4CCNCC4)=NC=3C2=CC=C1C1=CC=NC=C1 HFGHRUCCKVYFKL-UHFFFAOYSA-N 0.000 description 1
- OIFBSDVPJOWBCH-UHFFFAOYSA-N Diethyl carbonate Chemical compound CCOC(=O)OCC OIFBSDVPJOWBCH-UHFFFAOYSA-N 0.000 description 1
- KMTRUDSVKNLOMY-UHFFFAOYSA-N Ethylene carbonate Chemical compound O=C1OCCO1 KMTRUDSVKNLOMY-UHFFFAOYSA-N 0.000 description 1
- 229910013290 LiNiO 2 Inorganic materials 0.000 description 1
- 229910013870 LiPF 6 Inorganic materials 0.000 description 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910021383 artificial graphite Inorganic materials 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 238000001354 calcination Methods 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 229910000428 cobalt oxide Inorganic materials 0.000 description 1
- IVMYJDGYRUAWML-UHFFFAOYSA-N cobalt(ii) oxide Chemical compound [Co]=O IVMYJDGYRUAWML-UHFFFAOYSA-N 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000008151 electrolyte solution Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- JBTWLSYIZRCDFO-UHFFFAOYSA-N ethyl methyl carbonate Chemical compound CCOC(=O)OC JBTWLSYIZRCDFO-UHFFFAOYSA-N 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 238000001879 gelation Methods 0.000 description 1
- 238000002847 impedance measurement Methods 0.000 description 1
- 229910002102 lithium manganese oxide Inorganic materials 0.000 description 1
- QEXMICRJPVUPSN-UHFFFAOYSA-N lithium manganese(2+) oxygen(2-) Chemical class [O-2].[Mn+2].[Li+] QEXMICRJPVUPSN-UHFFFAOYSA-N 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- AMWRITDGCCNYAT-UHFFFAOYSA-L manganese oxide Inorganic materials [Mn].O[Mn]=O.O[Mn]=O AMWRITDGCCNYAT-UHFFFAOYSA-L 0.000 description 1
- PPNAOCWZXJOHFK-UHFFFAOYSA-N manganese(2+);oxygen(2-) Chemical class [O-2].[Mn+2] PPNAOCWZXJOHFK-UHFFFAOYSA-N 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 239000002923 metal particle Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- AYOOGWWGECJQPI-NSHDSACASA-N n-[(1s)-1-(5-fluoropyrimidin-2-yl)ethyl]-3-(3-propan-2-yloxy-1h-pyrazol-5-yl)imidazo[4,5-b]pyridin-5-amine Chemical compound N1C(OC(C)C)=CC(N2C3=NC(N[C@@H](C)C=4N=CC(F)=CN=4)=CC=C3N=C2)=N1 AYOOGWWGECJQPI-NSHDSACASA-N 0.000 description 1
- 229910000480 nickel oxide Inorganic materials 0.000 description 1
- GNRSAWUEBMWBQH-UHFFFAOYSA-N oxonickel Chemical compound [Ni]=O GNRSAWUEBMWBQH-UHFFFAOYSA-N 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 229910052596 spinel Inorganic materials 0.000 description 1
- 239000011029 spinel Substances 0.000 description 1
Images
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
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
-
- 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
- H01M4/131—Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
-
- 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
-
- 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
-
- 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
- H01M4/485—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of mixed oxides or hydroxides for inserting or intercalating light metals, e.g. LiTi2O4 or LiTi2OxFy
-
- 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
- H01M4/50—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of manganese
- H01M4/505—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of manganese of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy
-
- 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
- H01M4/52—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron
- H01M4/525—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy
-
- 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 a method for manufacturing a lithium secondary battery positive electrode active material and a lithium secondary battery positive electrode active material produced thereby, more specifically, a lithium secondary battery positive electrode active material comprising the step of doping or coating with a certain metal oxide It relates to a method for producing and a lithium secondary battery positive electrode active material is reduced residual lithium produced thereby.
- lithium secondary batteries that exhibit high energy density and operating potential, have a long cycle life, and have a low self discharge rate. It is commercialized and widely used.
- Lithium-containing cobalt oxide (LiCoO 2 ) is mainly used as a positive electrode active material of a lithium secondary battery.
- lithium-containing manganese oxides such as LiMnO 2 having a layered crystal structure and LiMn 2 O 4 having a spinel crystal structure, and lithium-containing nickel oxide
- phosphorus LiNiO 2 is also contemplated.
- LiCoO 2 is most frequently used because of its excellent life characteristics and excellent charge / discharge efficiency, but due to its small capacity and high cost due to resource limitations of cobalt used as a raw material, it is used as a power source for medium and large battery fields such as electric vehicles.
- the disadvantage is that there is a limit in price competitiveness.
- Lithium manganese oxides such as LiMnO 2 and LiMn 2 O 4 are rich in manganese resources used as raw materials and have the advantages of being cheap, environmentally friendly, and excellent in thermal safety, but having a small capacity, high temperature characteristics and cycle characteristics. There is this poor problem.
- the method for producing a lithium composite oxide generally includes preparing a transition metal precursor, mixing the transition metal precursor and the lithium compound, and then calcining the mixture.
- LiOH and / or Li 2 CO 3 is used as the lithium compound.
- the Ni content of the positive electrode active material is 65% or less
- Li 2 CO 3 is used, and when the Ni content is 65% or more, it is preferable to use LiOH because it is a low temperature reaction.
- the Ni rich system having a Ni content of 65% or more is a low temperature reaction, there is a problem in that the amount of residual lithium present in the form of LiOH and Li 2 CO 3 on the surface of the cathode active material is high.
- Such residual lithium that is, unreacted LiOH and Li 2 CO 3 reacts with the electrolyte and the like in the battery, causing gas generation and swelling, thereby causing a problem of severely deteriorating high temperature safety.
- unreacted LiOH may cause gelation due to its high viscosity during slurry mixing before electrode plate production.
- An object of the present invention is to provide a method for producing a new lithium secondary battery cathode active material that can improve the capacity and rate characteristics while removing the unreacted lithium in order to solve the problems of the prior art as described above.
- Another object of the present invention is to provide a lithium secondary battery cathode active material produced by the production method of the present invention.
- the present invention to solve the above problems
- M1 is one or more elements selected from the group consisting of Co, Mn,
- M2 is one or more elements selected from the group consisting of Al, Mn, Mg, Si, P and Ga,
- step ii) washing with water by adding the compound obtained in step i) to a washing solution;
- the compound dried in step iii) is a metal oxide containing a lithium compound and M3 (M3 is Al, B, Ba, Mg, Ce, Cr, F, Li, Mo, P, Sr, Ti, and Zr At least one element selected from the group consisting of M1, M2 and M3 are not all the same); And
- the washing solution of step ii) is distilled water, methanol, ethanol, 2-propanol, 1-butanol, ethylene glycol, polyvinyl alcohol (PVA), acetone, acetylacetone, benzophenone, NaOH , NH 4 OH, LiOH, KOH, Mg (OH) 2 And Ba (OH) 2 It characterized in that it comprises one or more selected from the group consisting of.
- step of drying the washed compound in step iii is characterized in that the drying in a reduced pressure atmosphere at 50 to 300 °C.
- the metal oxide containing M3 in the iv) step of mixing with the metal oxide containing the particles, lithium compound and M3 dried in the step iii) is characterized in that the particle diameter is 5 ⁇ m or less It is done.
- M3 is cerium, and the metal oxide containing M3 is CeO 2 .
- M3 is Mg
- the metal oxide containing M3 is MgO
- the mixed with the metal particles comprising the particles, lithium compounds and M3 dried in step iii) iv) comprises the M3 per 100 parts by weight of the particles dried in step iii)
- the metal oxide is characterized in that it is mixed at a ratio of 0.001 to 10 parts by weight.
- step vi) adding the particles heat-treated in the step v) to a washing solution and washing; It is preferable to further include.
- the washing solution used in step vi) is preferably the same as the washing solution of step ii), specifically, methanol, ethanol, 2-propanol, 1-butanol, ethylene glycol, polyvinyl alcohol (PVA), acetone , Acetylacetone, benzophenone, NaOH, NH 4 OH, LiOH, KOH, Mg (OH) 2 and Ba (OH) 2 characterized in that it comprises one or more selected from the group consisting of.
- the manufacturing method according to the present invention is as described above vi) after the washing step vii) a metal oxide for surface coating comprising the lithium nickel composite oxide represented by the formula (2) and M4 (M4 is M3 Al, B, Ba, Mg, At least one element selected from the group consisting of Ce, Cr, F, Li, Mo, P, Sr, Ti, and Zr; And viii) heat treatment; It is possible to include more.
- the metal oxide for surface coating containing M4 has a particle diameter of 5 ⁇ m or less.
- M4 is Mg
- the metal oxide for surface coating containing M4 is MgO
- the present invention also provides a lithium nickel composite oxide produced by the production method of the present invention.
- Lithium nickel composite oxide prepared by the production method of the present invention is characterized in that the peak is detected in the XRD range of 28 ° to 29 °, 45 ° to 50 °, 55 ° to 60 °.
- the present invention also provides a lithium secondary battery comprising a lithium nickel composite oxide produced by the production method of the present invention.
- the lithium secondary battery cathode active material prepared by the method for preparing a lithium secondary battery cathode active material according to the present invention exhibits high capacity characteristics while reducing the amount of unreacted lithium surface.
- 1 and 2 show the results of measuring the SEM photograph of the active material prepared in one embodiment and comparative example of the present invention.
- 3 and 4 show the results of measuring the XRD of the active material prepared in Examples and Comparative Examples of the present invention.
- Figure 6 shows the result of measuring the C-rate of the battery including the active material prepared in one embodiment and comparative example of the present invention.
- Figure 7 shows the results of measuring the life characteristics of a battery including the active material prepared in one embodiment and comparative example of the present invention.
- Figure 8 shows the result of measuring the impedance characteristics before and after high temperature storage of the battery containing the active material prepared in one embodiment and comparative example of the present invention.
- Figure 9 shows the results of measuring the thermal stability of the battery containing the active material prepared in one embodiment and comparative example of the present invention.
- NiCoAl (OH) 2 a precursor represented by NiCoAl (OH) 2 was prepared by co-precipitation.
- the prepared positive electrode active material for a lithium secondary battery was poured into distilled water and washed with water while maintaining the temperature.
- CeO 2 as a compound containing M4 for coating on a washed cathode active material was mixed with 0.005 mol and then heat treated at a second temperature.
- the positive electrode active material of Examples 2 to 4 was prepared in the same manner as in Example 1.
- Example-1 1.4 0.125 0.05
- Example-2 1.4 0.125 0.1
- Example-3 1.4 0.125 0.25
- Example-4 1.4 0.125 0.5
- Example-5 1.4 0.125 0.05
- Example-6 1.4 0.125 0.05 0.05
- Example-7 1.4 0.125 0.05 0.05 Comparative Example-1 1.4 0.125 Comparative Example-2 1.4 0.125 0.1
- NiCoAl (OH) 2 by coprecipitation
- the precursor represented by was prepared.
- the prepared positive electrode active material for a lithium secondary battery was poured into distilled water and washed with water while maintaining the temperature.
- NiCoAl (OH) 2 by coprecipitation
- the precursor represented by was prepared.
- the prepared positive electrode active material for a lithium secondary battery was poured into distilled water and washed with water while maintaining the temperature.
- TiO 2 0.005 mol was mixed as a compound containing M4 for coating on the washed cathode active material, and then heat-treated at a second temperature.
- NiCoAl (OH) 2 by coprecipitation
- the precursor represented by was prepared.
- the prepared positive electrode active material for a lithium secondary battery was poured into distilled water and washed with water while maintaining the temperature.
- CeO 2 0.005 mol was mixed as a compound containing M4 for coating on the washed cathode active material, and then heat-treated at a second temperature.
- NiCoAl (OH) 2 by coprecipitation
- the precursor represented by was prepared. 1.4 mol and 0.125 mol of Al 2 O 3 and Mg (OH) 2 were added to the prepared precursor as a compound containing LiOH and a dopant M3, respectively, and heat-treated at a first temperature to prepare a cathode active material for a lithium secondary battery. After distilled water was prepared and the temperature was kept constant, the prepared positive electrode active material for a lithium secondary battery was poured into distilled water and washed with water while maintaining the temperature. After the heat treatment at a second temperature to prepare a positive electrode active material of Comparative Example 1.
- NiCoAl (OH) 2 by coprecipitation
- the precursor represented by was prepared. 1.4 mol, 0.125 mol, and 0.1 mol of Al 2 O 3 , Mg (OH) 2 , and TiO 2 were added to the prepared precursor as a compound containing LiOH and a dopant M3, respectively, and heat-treated at a first temperature for a lithium secondary battery.
- a cathode active material was prepared. After distilled water was prepared and the temperature was kept constant, the prepared positive electrode active material for a lithium secondary battery was poured into distilled water and washed with water while maintaining the temperature. After the heat treatment at a second temperature to prepare a positive electrode active material of Comparative Example 2.
- a characteristic peak is detected in a range of 2 ⁇ from 28 ° to 29 °, 45 ° to 50 °, and 55 ° to 60 °, in particular 2 ⁇ .
- the intensity of the peak detected when CeO 2 is added after firing is higher than that of simultaneously inputting a lithium source and CeO 2 .
- Example-1 782 1,123 215 76.6 236.8 13.9
- Example-2 927 1,183 215 77.7 236.2 17.2
- Example-3 1,401 1,885 215 64.4 - 26.3
- Example-4 1,502 2,006 215 63.0 - 33.9
- Example-5 1,444 1,494 215.6 70.9 243.5 11.4
- Comparative Example-1 1,592 2,025 219 45.6 232.8 35.1
- a slurry was prepared by mixing a lithium secondary battery positive electrode active material prepared according to each of the above Examples and Comparative Examples, artificial graphite as a conductive material, and polyvinylidene fluoride (PVdF) as a binder in a weight ratio of 85: 10: 5.
- the slurry was uniformly applied to an aluminum foil having a thickness of 15 ⁇ m, and vacuum dried at 135 ° C. to prepare a positive electrode for a lithium secondary battery.
- the c-rate was measured for the coin cell containing the positive electrode active material of Examples and Comparative Examples, and the results are shown in Table 2 and FIG. 6.
- Example 1 In the case of Example 1 in which the cerium oxide was introduced at the time of heat treatment after coating, it was confirmed that the life characteristics were significantly improved compared to Comparative Example-1 without introducing cerium.
- the battery including the cathode active material of Example 5 doped with cerium as a lithium source according to the present invention shows not only the impedance measured before storage but also the smallest increase in impedance after storage. Can be.
- cerium oxide was found to exhibit excellent thermal stability.
- the lithium secondary battery cathode active material prepared by the method for preparing a lithium secondary battery cathode active material according to the present invention exhibits high capacity characteristics while reducing the amount of unreacted lithium surface.
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Abstract
Description
구분 | M3, mol% | M4, mol% | ||||
Al | Mg | Ce | Ti | Ce | Ti | |
실시예-1 | 1.4 | 0.125 | 0.05 | |||
실시예-2 | 1.4 | 0.125 | 0.1 | |||
실시예-3 | 1.4 | 0.125 | 0.25 | |||
실시예-4 | 1.4 | 0.125 | 0.5 | |||
실시예-5 | 1.4 | 0.125 | 0.05 | |||
실시예-6 | 1.4 | 0.125 | 0.05 | 0.05 | ||
실시예-7 | 1.4 | 0.125 | 0.05 | 0.05 | ||
비교예-1 | 1.4 | 0.125 | ||||
비교예-2 | 1.4 | 0.125 | 0.1 |
No | 잔류리튬, ppm | 방전용량(0.1C) | 수명 유지율, % | DSC peak,'C | 저장후 | |
LiOH | Li2CO3 | lmp.,ohm | ||||
실시예-1 | 782 | 1,123 | 215 | 76.6 | 236.8 | 13.9 |
실시예-2 | 927 | 1,183 | 215 | 77.7 | 236.2 | 17.2 |
실시예-3 | 1,401 | 1,885 | 215 | 64.4 | - | 26.3 |
실시예-4 | 1,502 | 2,006 | 215 | 63.0 | - | 33.9 |
실시예-5 | 1,444 | 1,494 | 215.6 | 70.9 | 243.5 | 11.4 |
비교예-1 | 1,592 | 2,025 | 219 | 45.6 | 232.8 | 35.1 |
비교예-2 | 819 | 1,348 | 219 | 60.9 | 236.5 | 16.2 |
Claims (15)
- i) 하기 화학식 1로 표시되는 니켈 복합산화물을 제조하는 단계;[화학식 1] Ni1-x-yM1xM2y(OH)2(M1은 Co, Mn 로 이루어진 군으로부터 선택된 하나 이상의 원소이고,M2는 Al, Mn, Mg, Si, P 및 Ga로 이루어진 군으로부터 선택된 하나 이상의 원소이며,0 ≤≤ a ≤≤ 0.3 이고, 0 ≤≤ x ≤≤ 0.03, 0 ≤≤ y ≤≤ 0.03 임)ii) 상기 i)단계에서 얻어진 화합물을 수세 용액에 첨가하여 수세하는 단계;iii) 상기 ii)단계에서 수세된 화합물을 건조시키는 단계;iv) 상기 iii)단계에서 건조된 화합물을 리튬 화합물 및 M3 를 포함하는 금속 산화물(M3 는 Al, B, Ba, Mg, Ce, Cr, F, Li, Mo, P, Sr, Ti, 및 Zr 으로 이루어진 그룹에서 선택된 하나 이상의 원소이고, M1, M2 및 M3는 모두 동일하지 않음)과 혼합하는 단계; 및v) 열처리 하는 단계;를 포함하는 하기 화학식 2로 표시되는 리튬 니켈 복합 산화물의 제조 방법.[화학식 2] Li1+aNi1-x-yM1xM2yM3zO2(상기 화학식 2에서 M1은 Co, Mn 로 이루어진 군으로부터 선택된 하나 이상의 원소이고, M2는 Al, Mn, Mg, Si, P 및 Ga로 이루어진 군으로부터 선택된 하나 이상의 원소이며, 0 ≤≤ a ≤≤ 0.3 이고, 0 ≤≤ x ≤≤ 0.03, 0 ≤≤ y ≤≤ 0.03, 0 ≤≤ z ≤≤ 0.03 임)
- 제 1 항에 있어서,상기 ii)단계의 수세 용액은 증류수, 메탄올, 에탄올, 2-프로판올, 1-부탄올, 에틸렌글리콜, 폴리비닐알콜(PVA), 아세톤, 아세틸아세톤, 벤조페논, NaOH, NH4OH, LiOH, KOH, Mg(OH)2 및 Ba(OH)2 으로 이루어진 그룹에서 선택된 하나 이상을 포함하는 것인리튬 니켈 복합 산화물의 제조 방법.
- 제 1 항에 있어서,iii) 상기 ii)단계에서 수세된 화합물을 건조시키는 단계에서는 50 내지 300 ℃에서 감압 분위기에서 건조시키는 것인리튬 니켈 복합 산화물의 제조 방법.
- 제 1 항에 있어서,상기 iv) 단계에서 상기 iii) 단계에서 건조된 입자, 리튬 화합물 및 M3 를 포함하는 금속 산화물과 혼합하는 단계에서 상기 M3 를 포함하는 금속 산화물은 입자 직경이 5 ㎛ 이하인 것인리튬 니켈 복합 산화물의 제조 방법.
- 제 1 항에 있어서,상기 M3 는 세륨이고, 상기 M3 를 포함하는 금속 산화물은 CeO2 인 것인리튬 니켈 복합 산화물의 제조 방법.
- 제 1 항에 있어서,상기 M3 는 Mg 이고, 상기 M3 를 포함하는 금속 산화물은 MgO 인 것인리튬 니켈 복합 산화물의 제조 방법.
- 제 1 항에 있어서,상기 iv) 단계에서 상기 iii) 단계에서 건조된 입자, 리튬 화합물 및 M3 를 포함하는 금속 산화물과 혼합하는 단계에서상기 iii) 단계에서 건조된 입자 100 중량부당 상기 M3 를 포함하는 금속 산화물은 0.001 내지 10 중량부의 비율로 혼합되는 것인리튬 니켈 복합 산화물의 제조 방법.
- 제 1 항 내지 제 7 항 중 어느 한 항에 의하여 제조된 리튬 니켈 복합 산화물.
- 제 1 항에 있어서,vi) 상기 v)단계에서 열처리된 입자를 수세 용액에 첨가하여 수세하는 단계; 를 더 포함하는 것인리튬 니켈 복합 산화물의 제조 방법.
- 제 9 항에 있어서,상기 수세 용액은 증류수, 메탄올, 에탄올, 2-프로판올, 1-부탄올, 에틸렌글리콜, 폴리비닐알콜(PVA), 아세톤, 아세틸아세톤, 벤조페논, NaOH, NH4OH, LiOH, KOH, Mg(OH)2 및 Ba(OH)2 으로 이루어진 그룹에서 선택된 하나 이상을 포함하는 것인리튬 니켈 복합 산화물의 제조 방법.
- 제 1 항에 있어서,vii) 상기 화학식 2로 표시되는 리튬 니켈 복합 산화물과 M4 를 포함하는 표면 코팅용 금속 산화물(M4 는 M3 는 Al, B, Ba, Mg, Ce, Cr, F, Li, Mo, P, Sr, Ti, 및 Zr 으로 이루어진 그룹에서 선택된 하나 이상의 원소임)을 혼합하는 단계; 및viii) 열처리 하는 단계; 를 더 포함하는리튬 니켈 복합 산화물의 제조 방법.
- 제 11 항에 있어서,상기 M4 를 포함하는 표면 코팅용 금속 산화물은 입자 직경이 5 ㎛ 이하인 것인리튬 니켈 복합 산화물의 제조 방법.
- 제 11 항에 있어서,상기 M4 를 포함하는 표면 코팅용 금속 산화물은 CeO2 인 것인리튬 니켈 복합 산화물의 제조 방법.
- 제 9 항 내지 제 13 항 중 어느 한 항의 제조 방법에 의하여 제조된리튬 니켈 복합 산화물.
- 제 14 항에 있어서,상기 리튬 니켈 복합 산화물은 XRD 에서 2θ 가 28° 내지 29°, 45° 내지 50°, 55° 내지 60° 범위에서 피크가 검출되는 것인리튬 니켈 복합 산화물.
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