WO2007102407A1 - 非水電解質二次電池用正極活物質及びその製造方法 - Google Patents
非水電解質二次電池用正極活物質及びその製造方法 Download PDFInfo
- Publication number
- WO2007102407A1 WO2007102407A1 PCT/JP2007/053968 JP2007053968W WO2007102407A1 WO 2007102407 A1 WO2007102407 A1 WO 2007102407A1 JP 2007053968 W JP2007053968 W JP 2007053968W WO 2007102407 A1 WO2007102407 A1 WO 2007102407A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- lithium
- zirconium
- positive electrode
- active material
- electrode active
- Prior art date
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- 239000007774 positive electrode material Substances 0.000 title claims abstract description 71
- 239000011255 nonaqueous electrolyte Substances 0.000 title claims abstract description 33
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 15
- 238000000034 method Methods 0.000 title abstract description 15
- 239000000843 powder Substances 0.000 claims abstract description 146
- 229910052744 lithium Inorganic materials 0.000 claims abstract description 142
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims abstract description 141
- 239000002131 composite material Substances 0.000 claims abstract description 129
- 229910052726 zirconium Inorganic materials 0.000 claims abstract description 110
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 claims abstract description 107
- 239000002344 surface layer Substances 0.000 claims abstract description 32
- 229910052784 alkaline earth metal Inorganic materials 0.000 claims abstract description 6
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 5
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 5
- 229910052723 transition metal Inorganic materials 0.000 claims abstract description 5
- 239000007864 aqueous solution Substances 0.000 claims description 55
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 16
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 14
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- 239000001301 oxygen Substances 0.000 claims description 14
- 229910052760 oxygen Inorganic materials 0.000 claims description 14
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- 238000003756 stirring Methods 0.000 claims description 12
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 11
- 239000011777 magnesium Substances 0.000 claims description 11
- 229910052749 magnesium Inorganic materials 0.000 claims description 10
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 10
- 238000005507 spraying Methods 0.000 claims description 10
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 7
- WRAGBEWQGHCDDU-UHFFFAOYSA-M C([O-])([O-])=O.[NH4+].[Zr+] Chemical compound C([O-])([O-])=O.[NH4+].[Zr+] WRAGBEWQGHCDDU-UHFFFAOYSA-M 0.000 claims description 6
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- BZUYOAAPZVNNSP-UHFFFAOYSA-N N.[Zr+4] Chemical class N.[Zr+4] BZUYOAAPZVNNSP-UHFFFAOYSA-N 0.000 claims description 2
- HFCVPDYCRZVZDF-UHFFFAOYSA-N [Li+].[Co+2].[Ni+2].[O-][Mn]([O-])(=O)=O Chemical compound [Li+].[Co+2].[Ni+2].[O-][Mn]([O-])(=O)=O HFCVPDYCRZVZDF-UHFFFAOYSA-N 0.000 claims description 2
- 239000007788 liquid Substances 0.000 claims description 2
- RSNHXDVSISOZOB-UHFFFAOYSA-N lithium nickel Chemical compound [Li].[Ni] RSNHXDVSISOZOB-UHFFFAOYSA-N 0.000 claims description 2
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- 229910052757 nitrogen Inorganic materials 0.000 abstract description 4
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- CKFRRHLHAJZIIN-UHFFFAOYSA-N cobalt lithium Chemical compound [Li].[Co] CKFRRHLHAJZIIN-UHFFFAOYSA-N 0.000 description 8
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- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 229910052712 strontium Inorganic materials 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 230000002194 synthesizing effect Effects 0.000 description 1
- 229910052715 tantalum Inorganic materials 0.000 description 1
- 239000011975 tartaric acid Substances 0.000 description 1
- 235000002906 tartaric acid Nutrition 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000009210 therapy by ultrasound Methods 0.000 description 1
- XOLBLPGZBRYERU-UHFFFAOYSA-N tin dioxide Chemical compound O=[Sn]=O XOLBLPGZBRYERU-UHFFFAOYSA-N 0.000 description 1
- 229910001887 tin oxide Inorganic materials 0.000 description 1
- 229910000348 titanium sulfate Inorganic materials 0.000 description 1
- VZCYOOQTPOCHFL-UHFFFAOYSA-N trans-butenedioic acid Natural products OC(=O)C=CC(O)=O VZCYOOQTPOCHFL-UHFFFAOYSA-N 0.000 description 1
- 150000003623 transition metal compounds Chemical class 0.000 description 1
- VXYADVIJALMOEQ-UHFFFAOYSA-K tris(lactato)aluminium Chemical compound CC(O)C(=O)O[Al](OC(=O)C(C)O)OC(=O)C(C)O VXYADVIJALMOEQ-UHFFFAOYSA-K 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
- ZXAUZSQITFJWPS-UHFFFAOYSA-J zirconium(4+);disulfate Chemical compound [Zr+4].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O ZXAUZSQITFJWPS-UHFFFAOYSA-J 0.000 description 1
Classifications
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- H—ELECTRICITY
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- 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
- H01M4/1315—Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx containing halogen atoms, e.g. LiCoOxFy
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- H01M4/36—Selection of substances as active materials, active masses, active liquids
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- C01D15/00—Lithium compounds
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- C01G45/12—Manganates manganites or permanganates
- C01G45/1221—Manganates or manganites with a manganese oxidation state of Mn(III), Mn(IV) or mixtures thereof
- C01G45/1228—Manganates or manganites with a manganese oxidation state of Mn(III), Mn(IV) or mixtures thereof of the type [MnO2]n-, e.g. LiMnO2, Li[MxMn1-x]O2
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- C01G51/44—Cobaltates containing alkali metals, e.g. LiCoO2 containing manganese
- C01G51/50—Cobaltates containing alkali metals, e.g. LiCoO2 containing manganese of the type [MnO2]n-, e.g. Li(CoxMn1-x)O2, Li(MyCoxMn1-x-y)O2
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- C01G53/42—Nickelates containing alkali metals, e.g. LiNiO2
- C01G53/44—Nickelates containing alkali metals, e.g. LiNiO2 containing manganese
- C01G53/50—Nickelates containing alkali metals, e.g. LiNiO2 containing manganese of the type [MnO2]n-, e.g. Li(NixMn1-x)O2, Li(MyNixMn1-x-y)O2
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- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/139—Processes of manufacture
- H01M4/1391—Processes of manufacture of electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
- H01M4/13915—Processes of manufacture of electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx containing halogen atoms, e.g. LiCoOxFy
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- 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
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- 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
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- 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
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- 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
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- 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 positive electrode active material used for a non-aqueous electrolyte secondary battery such as a lithium ion secondary battery.
- non-aqueous electrolyte secondary batteries such as lithium secondary batteries having a small size, light weight, and high energy density have been developed with the rapid development of information-related equipment and communication equipment such as personal computers and mobile phones.
- Positive electrode active materials for non-aqueous electrolyte secondary batteries include lithium and transition metal compounds such as LiCoO, LiNiO, LiNi Co O, and LiMn O.
- lithium cobalt composite oxide (LiCoO) is used as a positive electrode active material.
- Lithium secondary batteries using carbon such as copper alloy, graphite, and carbon fiber as the negative electrode are widely used as batteries having high energy density because high voltages of 4V are obtained.
- Patent Documents 1 and 2 in the synthesis of a lithium cobalt composite oxide, lithium cobalt is added by using zirconium oxide as a raw material and adding zirconium by a solid phase method.
- the surface of the composite oxide powder describes lithium cobalt composite oxide containing a concentration of 20% or more of the atomic ratio of gallium and conolate over the range of 50 nm to 100 nm.
- Patent Documents 3 and 4 in synthesizing a lithium cobalt composite oxide, a zirconium oxide is used as a raw material, and zirconium is added using a solid phase method to obtain a lithium cobalt composite oxide.
- the compound containing zirconium on the powder surface of the It describes lithium cobalt complex oxide deposited with more than 80% of the surface exposed.
- Patent Document 5 powdered acid zirconium oxide is used as a zirconium source compound, and the powder mixed with the raw materials is baked at a high temperature of 900 ° C. to obtain a lithium cobalt complex oxide. Synthesize.
- the lithium corundum complex oxide obtained by this method contains zirconium in a state where zirconium is dissolved and diffused in the powder of the complex oxide.
- Patent Document 6 zirconium or zirconium and aluminum were coated on the powder surface using a suspension containing zirconium or a suspension containing zirconium and aluminum.
- a lithium cobalt complex oxide is described.
- lithium cobalt composite oxide is coated with zirconium using an acidic zirconium nitrate aqueous solution having a pH of 1.5 or less, and then at a relatively high temperature of 600 ° C.
- a lithium cobalt complex oxide coated with zirconium by firing is described.
- coating treatment is performed using such an acidic aqueous solution, it is known that the surface of the composite oxide powder dissolves and some elements contained in the composite powder such as lithium and cobalt are eluted. It has been.
- Patent Document 1 Japanese Patent Application Laid-Open No. 2004-311408
- Patent Document 2 JP-A-2005-190900
- Patent Document 3 Japanese Patent Laid-Open No. 2005-85635
- Patent Document 4 Japanese Patent Laid-Open No. 2005-50779
- Patent Document 5 Japanese Patent No. 2855877
- Patent Document 6 Japanese Unexamined Patent Publication No. 2003-178759
- Patent Document 7 Japanese Unexamined Patent Application Publication No. 2004-175609
- the lithium-containing composite oxide powder obtained in Patent Documents 1 to 7 described above is used as a positive electrode active material of a non-aqueous electrolyte secondary battery such as a lithium secondary battery, the volume capacity density thereof is Further improvement is required, as long as it is not necessarily large, and safety and charge / discharge cycle characteristics cannot be fully satisfied at the same time.
- the charging voltage is generally 4.3 V, and 50 to 60% of the positive electrode active material is not used for charging and discharging. It is desired that the discharge capacity can be further improved by increasing the amount of the positive electrode active material that can be used by increasing the pressure.
- the charging voltage is 4.5 V
- about 70% of the positive electrode active material can be used, and the discharge capacity can be dramatically improved.
- the charge / discharge cycle characteristics are not sufficient when the charge voltage is 4.3V. Charge / discharge is performed under a high operating voltage of 4.5V. The cycle characteristics are even worse.
- An object of the present invention is to provide a positive electrode for a non-aqueous electrolyte secondary battery used for a lithium secondary battery or the like having high volume capacity density and high safety even at a high operating voltage and having excellent charge / discharge cycle characteristics.
- the present inventor has made a lithium-containing composite oxide powder having a specific composition, and zirconium is contained in a very small 5 nm surface layer of the powder (zirconium-Z element). It has been found that the above-mentioned object can be achieved by adding the N) atomic ratio to a concentration of 1.0 or more, which is relatively high! That is, according to the study of the present inventor, although the above-described conventional lithium-containing composite oxide powder contains zirconium, the concentration of zirconium is inherently large, particularly in the surface layer. Turned out to be not big.
- the lithium-containing composite oxide powders described in Patent Document 1 to Patent Document 5 described above have a force in which zirconium is contained at almost the same concentration throughout the entire surface layer of the powder within 5 nm (zirconium The atomic ratio of Z element N) is at most about 0.7.
- zirconium is impregnated by treating the surface of the lithium-containing composite oxide powder with a suspension or solution containing zirconium. In these cases, the atomic ratio of (zirconium Z element N) within 5 nm of the powder surface layer is at most about 0.7.
- the lithium-containing composite oxide powder in which zirconium is present at a relatively high concentration in such an extremely thin surface layer is not necessarily used for the mechanism having excellent characteristics.
- a non-aqueous electrolyte secondary battery such as a lithium secondary battery using the lithium-containing composite oxide powder as a positive electrode
- a decomposition reaction of the electrolyte occurs and a gas containing carbon dioxide is generated.
- the present invention is based on the above-described novel findings and has the following gist.
- Zirconium contained in the lithium-containing composite oxide powder is 0.00005-0.01 in terms of atomic ratio with respect to the total of element M and element N.
- Positive electrode active material for batteries is 0.00005-0.01 in terms of atomic ratio with respect to the total of element M and element N.
- the lithium-containing composite oxide is lithium conoleate, and the element M contains zirconium and at least one of magnesium and aluminum.
- a positive electrode for a lithium secondary battery comprising a positive electrode active material, a conductive material, and a binder, wherein the positive electrode active material is for a nonaqueous electrolyte secondary battery according to any one of (1) to (5) A positive electrode for a lithium secondary battery comprising a positive electrode active material.
- a lithium secondary battery comprising a positive electrode, a negative electrode, and a non-aqueous electrolyte, wherein the positive electrode is the positive electrode described in (6).
- the method for producing a positive electrode active material for a nonaqueous electrolyte secondary battery comprising: step 1 of obtaining a zirconium-added powder by stirring while adding an aqueous solution of 12; and step 2 of firing the zirconium-added powder obtained in step 1 in an oxygen-containing atmosphere.
- a method for producing an active material comprising: step 1 of obtaining a zirconium-added powder by stirring while adding an aqueous solution of 12; and step 2 of firing the zirconium-added powder obtained in step 1 in an oxygen-containing atmosphere.
- step 1 the lithium-containing composite oxide powder is stirred with a drum mixer or a solid air low shearing stirrer while spraying an aqueous solution containing zirconium and having a pH of 3 to 12, and
- step 2 the method for producing a positive electrode active material for a non-aqueous electrolyte secondary battery according to (8), wherein the zirconium-added powder is fired at 200 to 600 ° C.
- a non-comprising lithium-containing composite oxide powder having high operating voltage without reducing volumetric capacity density and safety, high volumetric capacity density, high safety, and excellent charge / discharge cycle characteristics.
- a positive electrode active material for a water electrolyte secondary battery a method for producing the positive electrode active material, and a nonaqueous electrolyte secondary battery using the positive electrode active material.
- element M contains zirconium
- y is calculated including both zirconium in the surface layer and inside of the lithium-containing composite oxide powder.
- the element N is at least one element selected from the group consisting of cobalt, manganese, and nickel. Among these, the viewpoint of practicality is preferred. Cobalt alone or a combination of correto-manganese-- nickel is preferred. Further, when the discharge capacity is more important, the sole is particularly preferable.
- the element M is at least one element selected from the group force consisting of a transition metal element other than the element N, A1, and an alkaline earth metal element force.
- a transition metal element other than the element N, A1 at least one selected from the group forces of Ti, Zr, Hf, V, Nb, Ta, Mo, Mg, Ca, Sr, Ba, and Al force is preferable.
- the group power consisting of Ti, Zr, Hf, Mg and A1 is more preferable.
- the group power consisting of Zr, Mg and A1 is more preferable.
- Especially preferred is at least one selected.
- the atomic ratio is preferably 0.0005 to 0.03 force S, and more preferably 0.001 to 0.000 force S with respect to the sum of the element N and the element M. Especially preferred.
- the atomic ratio is preferably 0.0005 to 0.03 force, more preferably 0.001 to 0.020 force, particularly preferably with respect to the total of the elements N and M.
- Zirconium contained in the lithium-containing composite oxide powder according to the present invention is preferably in an atomic ratio of 0.00005-0.01, more preferably 0.000 in terms of atomic ratio with respect to the total of element M and element N. 0001 ⁇ 0.005 force Even a strong force of 0.0005 to 0.005 force is particularly preferable.
- zirconium is the total of zirconium contained in the surface layer and inside of the lithium-containing composite oxide powder.
- the total of element M and element N represents the total of element M and element N contained in the surface layer and inside of the lithium-containing composite oxide powder.
- the lithium-containing composite oxide powder according to the present invention contains zirconium in the surface layer, and the atomic ratio of (zirconium Z element N) within 5 nm of the surface layer is 1.0 or more.
- zirconium it is necessary that zirconium is contained in a predetermined ratio in the surface layer of the lithium-containing composite oxide powder, and if it is outside the predetermined range, the object of the present invention described above is Cannot be achieved.
- the content of zirconium within 5 nm of the surface layer of the lithium-containing composite oxide powder is questioned, in the present invention, it exists in the vicinity of the surface of the lithium-containing composite oxide powder as described above.
- Zirconium is important, and at the same time, it has the ability to analyze the content of zirconium within 5 nm of the surface layer of particles by XPS analysis (X-ray photoelectron spectroscopy) as described below.
- the atomic ratio of (zirconium Z element N) within 5 nm of the surface layer of the lithium complex oxide powder is preferably 1.0 to 4.0 force S, more preferably 1.0 to 3 0 Force is preferable to S, and 1.5 to 2.5 is particularly preferable even with a strong force.
- the surface layer contains zirconium at the specific concentration described above, and zirconium may or may not be present in the powder. Also good. However, even when zirconium is present inside the powder, it is not preferable that the zirconium be present at such a high concentration as the surface layer is within 5 nm because the volume capacity density is lowered.
- the atomic ratio of (zirconium-Z element N) within 5 nm of the surface layer of the powder surface of the lithium composite oxide is easily determined by XPS analysis (X-ray photoelectron spectroscopy). Be analyzed. XPS analysis can analyze the type of elements contained in a layer very close to the surface of the particles or the abundance of elements.
- An example of an XPS analyzer is ESCA 5400 (non-monochrome type) manufactured by PHI.
- a peak that can be detected with high sensitivity and does not overlap with the peak of other elements as much as possible is used in the calculation. Is preferred.
- EPMA X-ray microanalyzer
- EDS energy dispersive X-ray spectroscopy
- the lithium-containing composite oxide according to the present invention may contain carbon within the surface layer of the powder within 5 nm. Furthermore, the amount of carbon within 5 nm from the surface layer of the powder is preferably in the range of 0.2 to 0.5 in terms of the atomic ratio of (carbon Z zirconium). Is more preferable.
- the “atomic ratio of (carbon Z zirconium) within 5 nm of the surface layer” is simply referred to as “atomic ratio (CZZr)”. The presence of such carbon is preferable because the charge / discharge cycle characteristics of the lithium-containing composite oxide powder tend to be further improved.
- XPS analysis can be used as a method for measuring the atomic ratio (CZZr).
- the value of atomic ratio (CZZr) can be calculated from the Is peak for carbon and the 3d peak for zirconium.
- FT-IR (Fourier transform infrared spectroscopy) analysis, thermal analysis, etc. can be used to analyze the presence of carbon contained in the surface layer within 5 nm from the powder surface.
- the atomic ratio (CZZr) of the lithium-containing composite oxide is in the above range, the reason why the charge / discharge cycle characteristics are further improved and the mechanism thereof are not necessarily clear.
- the compound containing carbon is distributed within 5 nm in the surface layer of the lithium-containing composite oxide powder of the present invention, and the compound containing carbon is a carbon dioxide such as ZrOCO, even if the compound containing carbon and zirconium is preferred.
- a compound containing a group and zirconium or a compound containing a carbo group and zirconium is particularly preferred.
- the lithium-containing composite oxide of the present invention includes LiCoO and LiCo Mn synthesized in advance.
- intermediate base material P containing zirconium in a complex oxide such as Ni 2 O (hereinafter also referred to as intermediate base material)
- the intermediate base material is a lithium-containing composite oxide used for non-aqueous electrolyte secondary battery applications, and after adding a Zr aqueous solution, the resulting lithium-containing composite oxide has the general formula Li NMOF ( N is at least one selected from the group consisting of Co, Mn and N
- the Zr aqueous solution is not particularly limited as long as it dissolves a water-soluble compound having a pH of 3 to 12 and containing zirconium. Among them, an aqueous solution in which an ammonium complex containing zirconium is dissolved is preferable. Furthermore, an aqueous solution in which zirconium carbonate ammonium or halogenated zirconium ammonia is dissolved is more preferable. In addition, in the step of adding the Zr aqueous solution to the intermediate base material, when fluorine is further covered by the positive electrode active material, The use of zirconium hydroxide is particularly preferred. Further, when it is desired to carry out the process at a lower cost, it is particularly preferable to use zirconium carbonate ammonium.
- the pH of the aqueous Zr solution is more preferably in the range of 5-10.
- the Zr aqueous solution contains a carboxylic acid! /, Or may /!
- a carboxylic acid is contained in the Zr aqueous solution
- the above carboxylic acid is preferably a carboxylic acid having 2 to 8 carbon atoms from the viewpoint of solubility in the aqueous solution, among which citrate, tartaric acid, oxalic acid, malonic acid, maleic acid are preferred. Acid, malic acid, dextrinic acid, lactic acid and daroxylic acid are more preferred.
- the solubility of zirconium contained in the Zr aqueous solution in water is improved, and zirconium dissolved in the Zr aqueous solution tends to further precipitate.
- the concentration of zirconium in the aqueous solution of Zr is preferably higher in terms of the point force that requires the aqueous medium to be removed by drying in a later step.
- concentration of zirconium in the aqueous solution is more preferably 0.1 to 5% by weight, even though 0.01 to 20% by weight is preferable.
- the Zr aqueous solution may be added to the intermediate base material by means of spraying and impregnating the Zr aqueous solution onto the powder of the intermediate base material, or the intermediate base material in the Zr aqueous solution contained in the container.
- a means for charging and impregnating the powder can be used.
- Specific examples of the stirrer used for stirring include a twin screw screwdriver, an axial mixer, a paddle mixer, a turbulator, a drum mixer, and a Ladige mixer.
- a stirrer that can perform stirring with low shearing force during stirring is preferable.
- a drum mixer or solid air can be preferably used as a stirring method with low shearing force during stirring.
- a drum mixer is particularly preferable.
- a small and even amount of zirconium can form a dense and uniform film on the extreme surface of the base material, and the atomic ratio (ZrZN) falls within a predetermined range.
- ZrZN the atomic ratio
- a small agitator having a lab size can be used in addition to a commercially available one.
- the treatment is performed on the added powder, preferably 50 to 200 ° C, particularly preferably 80 to At 140 ° C, usually 0.1 to: performed by drying for LO time. Since the aqueous medium in the added powder is removed in the subsequent firing process, it is not always necessary to completely remove it at this stage, but a large amount of energy is required to vaporize moisture in the firing process. It is better to remove as much as possible! /.
- the additive powder is heated in an oxygen-containing atmosphere at 200 to 600 ° C, usually for 0.1 to 24 hours.
- an oxygen-containing atmosphere at 200 to 600 ° C, usually for 0.1 to 24 hours.
- a lithium-containing composite oxide can be preferably obtained.
- a more preferable temperature range is 200 to 500 ° C, and 250 to 450 ° C is particularly preferable.
- the positive electrode active material of the present invention obtained as described above has an average particle size D50 of preferably 5 to 30 111, particularly preferably [8 to 25 111, > 1: preferably a surface area of 5 mm. 0.1 to 0.8 m 2 / g, particularly preferably 0.20 to 0.50 m 2 Zg.
- the (110) plane diffraction peak at 2 0 66.5 ⁇ 1 ° measured by X-ray diffraction using CuKa as the radiation source, half-width force S preferably ⁇ or 0.0.08-0 20 °, especially between 0.09 and 0.15 force! / ,.
- Press density force S preferably ⁇ 2.
- the press density means the apparent density of the powder when the lithium composite oxide powder is pressed at a pressure of 0.33 ton / cm 2 .
- the amount of residual alkali contained is preferably 0.20% by weight or less, particularly preferably 0.10% by weight or less.
- the average particle size is the particle size at which the cumulative curve is 50% in a cumulative curve in which the particle size distribution is obtained on a volume basis and the total volume is 100%.
- Volume-based means cumulative 50% diameter (D50).
- the particle size distribution can be obtained from the frequency distribution and cumulative volume distribution curve measured with a laser scattering particle size distribution measuring device. The particle size is measured by sufficiently dispersing the powder in an aqueous medium by ultrasonic treatment or the like and measuring the particle size distribution (for example, using Microtrac HRAX-100 manufactured by Leeds & Northrup).
- a method for obtaining a positive electrode for a lithium secondary battery using the positive electrode active material of the present invention can be carried out according to a conventional method.
- the positive electrode active material powder of the present invention is mixed with a carbon-based conductive material such as acetylene black, black lead, or ketjen black, and a binder.
- a carbon-based conductive material such as acetylene black, black lead, or ketjen black
- a binder such as acetylene black, black lead, or ketjen black
- An extreme mixture is formed.
- the noinder polyvinylidene fluoride, polytetrafluoroethylene, polyamide, carboxymethylcellulose, acrylic resin and the like are used.
- a slurry in which the above-mentioned positive electrode mixture is dispersed in a dispersion medium such as N-methylpyrrolidone is applied to a positive electrode current collector such as aluminum foil, dried and press-rolled to form a positive electrode active material layer. Formed on the current collector.
- the solute of the electrolyte solution is CIO-, CFSO-, BF-, PF-, AsF-, SbF-, CFCO-, (CF S
- an electrolyte composed of a lithium salt is preferably added to the solvent or the solvent-containing polymer at a concentration of 0.2 to 2 OmolZL. Beyond this range, the ionic conductivity decreases and the electrical conductivity of the electrolyte decreases. More preferably, 0.5 to 1.5 mol / L is selected.
- porous polyethylene or porous polypropylene film is used.
- Carbonate is preferred as a solvent for the electrolyte solution!
- Carbonates can be either cyclic or chain.
- cyclic carbonates include propylene carbonate and ethylene carbonate (EC).
- chain carbonate include dimethyl carbonate, jetyl carbonate (DEC), ethyl methyl carbonate, methyl propyl carbonate, methyl isopropyl carbonate, and the like.
- the carbonate ester may be used alone or in combination of two or more. Further, it may be used by mixing with other solvents. Depending on the material of the negative electrode active material, the combined use of chain carbonate and cyclic carbonate may improve discharge characteristics, charge / discharge cycle characteristics, and charge / discharge efficiency.
- a vinylidene fluoride-hexafluoropropylene copolymer for example, Kyner manufactured by Atchem Co.
- a vinylidene fluoride-perfluoropropyl butyl ether copolymer is used.
- the gel polymer electrolyte may be obtained by adding the following solutes.
- the negative electrode active material of a lithium battery using the positive electrode active material of the present invention for the positive electrode is a material capable of occluding and releasing lithium ions.
- the material for forming the negative electrode active material is not particularly limited. However, for example, lithium metals, lithium alloys, carbon materials, carbon compounds, carbonized carbide compounds, silicon oxide compounds, titanium sulfate, boron carbide compounds, periodic table 14 and 15 group 15 metals. Examples include porridges.
- the carbon material those obtained by pyrolyzing an organic substance under various pyrolysis conditions, artificial graphite, natural graphite, soil graphite, expanded graphite, flake graphite, and the like can be used.
- the oxide a compound mainly composed of tin oxide can be used.
- the negative electrode current collector copper foil, nickel foil or the like is used.
- the shape of the lithium secondary battery using the positive electrode active material in the present invention is not particularly limited.
- a sheet shape (so-called film shape), a folded shape, a wound-type bottomed cylindrical shape, a button shape, or the like is selected depending on the application.
- aqueous solution was prepared.
- Zirconium-added powder was obtained by mixing with a drum mixer while spraying 6 g of the prepared Zr aqueous solution on 100 g of the intermediate base material. Further, the zirconium-added powder was dried at 120 ° C for 4 hours, and then heated in an oxygen-containing atmosphere at 450 ° C for 12 hours, with an average particle size of 12.6 m, D10 force S6.9 m, D90 force 18.3 ⁇ m
- a lithium-containing composite oxide powder according to the present invention having a specific surface area of 0.31 m 2 Zg (composition: Li Co Zr 2 O 3) was obtained.
- the contained zirconium was 0.0015 in atomic ratio with respect to the total of cobalt and zirconium.
- the lithium-containing composite oxide powder, acetylene black, and polyvinylidene fluoride powder were mixed at a weight ratio of 90/5/5, and N-methylpyrrolidone was added to prepare a slurry.
- One side coating was applied to a / zm aluminum foil using a doctor blade.
- the positive electrode sheet for a lithium battery was produced by drying and roll press rolling three times.
- a material obtained by punching the positive electrode sheet is used for the positive electrode, a metal lithium foil having a thickness of 500 m is used for the negative electrode, a nickel foil of 20 m is used for the negative electrode current collector, and the separator is used.
- a porous polypropylene with a thickness of 25 / zm is used, and the electrolyte contains 1M LiPF /
- the positive electrode active material lg was charged to 4.3V at a load current of 75 mA at 25 ° C, and discharged to 2.5 V at a load current of 75 mA for the positive electrode active material lg.
- the initial discharge capacity was determined.
- the density of the electrode layer was determined.
- the battery was subjected to 30 charge / discharge cycle tests. As a result, at 25 ° C, 2.5 to 4.3 V
- the initial weight capacity density of the positive electrode active material was 160 mAhZg, and the capacity retention rate after 30 charge / discharge cycles was 99.0%.
- the same operation was performed except that the charging voltage was changed from 4.3 V to 4.5 V.
- the initial weight capacity density of the positive electrode active material at 2.5 to 4.5 V was obtained.
- the capacity retention rate after 30 cycles was 90.7%.
- the other battery was charged at 4.3 V and 4.5 V for 10 hours, disassembled in an argon glove box, taken out of the positive electrode sheet after charging, and its positive electrode sheet. After washing, it was punched out to a diameter of 3 mm, sealed in an aluminum capsule with EC, and heated at a rate of 5 ° CZ with a scanning differential calorimeter, and the heat generation start temperature was measured. As a result, the heat generation start temperature of the heat generation curve of the 4.3V charge product was 161 ° C, and the heat generation start temperature of the 4.5V charge product was 143 ° C.
- zirconium carbonate aqueous solution having a zirconium content of 14.5% by weight and 5.36 g of water were added to prepare a Zr aqueous solution having a pH of 6.0.
- Zirconium-added powder was obtained by mixing with a drum mixer while spraying 6 g of the prepared Zr aqueous solution to 100 g of the intermediate base material.
- the zirconium-added powder was dried at 120 ° C for 4 hours, and then heated in an oxygen-containing atmosphere at 450 ° C for 12 hours.
- the average particle size was 13.1 ⁇ m, D10 force, S7.7 / am, D90 force. 18.5 m, it table ® force 0.32 m 2 / g abbreviation ⁇ : lithium-containing composite oxide powder (composition; Li Co Zr O) according to the invention was obtained
- zirconium contained in the lithium-containing composite oxide powder was 0.000020 in atomic ratio with respect to the total of cobalt and zirconium.
- the X-ray diffraction spectrum was measured in the same manner as in Example 1.
- the half-value width of the diffraction peak of (1 10) plane at 20 66.5 ⁇ 1 ° was 0.108 °.
- the press density of this powder is 3.03gZ cm at 7 pieces.
- An electrode and a battery were prepared and evaluated in the same manner as in Example 1 except that the positive electrode sheet was prepared using the above lithium-containing composite oxide.
- the initial weight capacity density of the positive electrode active material at 25 ° C. and 2.5 to 4.3 V was 159 mAhZg, and the capacity retention rate after 30 charge / discharge cycles was 99.2%. It was.
- the initial weight capacity density of the positive electrode active material at 25 ° C. and 2.5 to 4.5 V was 190 mAh / g, and the capacity retention rate after 30 charge / discharge cycles was 91.5%.
- the heat generation start temperature of the heat generation curve of the 3V charged product is 160 ° C.
- the heat generation starting temperature of the 5V charged product was 142 ° C.
- zirconium carbonate aqueous solution having a zirconium content of 14.5% by weight and 2.79 g of water were added to prepare a Zr aqueous solution having a pH of 6.0.
- Zirconium-doped powder was obtained by mixing the intermediate base material 10 Og with a drum mixer while spraying 6 g of the prepared Zr aqueous solution.
- the zirconium-added powder was dried at 120 ° C for 4 hours and then heated in an oxygen-containing atmosphere at 450 ° C for 12 hours to obtain an average particle size of 12.
- zirconium contained in the lithium-containing composite oxide powder had an atomic ratio of 0.0006 with respect to the total of cobalt and zirconium.
- An electrode and a battery were prepared and evaluated in the same manner as in Example 1 except that the positive electrode sheet was prepared using the above lithium-containing composite oxide.
- the initial weight capacity density of the positive electrode active material at 25 ° C and 2.5 to 4.3 V was 157 mAhZg, and the capacity retention rate after 30 charge / discharge cycles was 99.5%. It was.
- the initial weight capacity density of the positive electrode active material at 25 ° C. and 2.5 to 4.5 V was 190 mAh / g, and the capacity retention rate after 30 charge / discharge cycles was 92.3%.
- the heat generation start temperature of the heat generation curve of the 3V charged product is 162 ° C.
- the heat generation starting temperature of the 5V charged product was 140 ° C.
- a Zr aqueous solution with a pH of 6.0 was prepared by adding 0.32 kg of zirconium carbonate aqueous solution having a zirconium content of 14.5% by weight and 7.18 kg of water.
- Zirconium-added powder was obtained by charging 10 kg of the intermediate base material into a Laedige mixer, heating to 80 ° C. while mixing, and mixing and drying while spraying 7.5 kg of the Zr aqueous solution. .
- the zirconium-added powder was heated in an oxygen-containing atmosphere at 450 ° C for 12 hours, the average particle size was 13.2 m, D10 force S7.0 m, D90 force 18.1 ⁇ m, and it surface area force 0 42m 2 / g Lithium-containing composite oxide powder (composition; Li Co Zr O
- the zirconium contained in the lithium-containing composite oxide powder was 0.0060 in atomic ratio with respect to the total of cobalt and zirconium.
- the X-ray diffraction spectrum was measured in the same manner as in Example 1.
- the half-width of the diffraction peak of (1 10) plane at 2 0 66.5 ⁇ 1 ° was 0.105 °.
- the press density of this powder is 3. OlgZ cm.
- An electrode and a battery were prepared and evaluated in the same manner as in Example 1 except that the positive electrode sheet was prepared using the above lithium-containing composite oxide.
- the initial weight capacity density of the positive electrode active material at 25 ° C. and 2.5 to 4.3 V was 156 mAhZg, and the capacity retention rate after 30 charge / discharge cycles was 99.6%. It was.
- the initial weight capacity density of the positive electrode active material at 25 ° C. and 2.5 to 4.5 V was 189 mAh / g, and the capacity retention rate after 30 charge / discharge cycles was 92.0%.
- the heat generation start temperature of the heat generation curve of the 3V charged product is 161 ° C.
- the heat generation starting temperature of the 5V charged product was 142 ° C.
- the obtained substantially spherical lithium-containing composite oxide (composition: LiCo Zr 2 O 3) had an average particle size of 12 .: L m and D10 of 6.7.
- the atomic ratio (ZrZN) of the composite oxide was measured by XPS analysis in the same manner as in Example 1.
- Zr / N 0.10
- the atomic ratio (CZZr) 0.14.
- An electrode and a battery were prepared and evaluated in the same manner as in Example 1 except that the positive electrode sheet was prepared using the above lithium-containing composite oxide.
- the initial weight capacity density of the positive electrode active material at 25 ° C. and 2.5 to 4.3 V was 160 mAhZg, and the capacity retention rate after 30 charge / discharge cycles was 98.4%. It was.
- the initial weight capacity density of the positive electrode active material at 25 ° C. and 2.5 to 4.5 V was 190 mAh / g, and the capacity retention rate after 30 charge / discharge cycles was 87.5%.
- the heat generation start temperature of the heat generation curve of the 3V charge product is 160 ° C
- the heat generation start temperature of the 4.5V charged product was 140 ° C.
- An aqueous solution in which the above compound was uniformly dissolved was prepared by adding 70 g of water to 6.42 g of an aqueous zirconium carbonate solution having a zirconium content of 14.5% by weight and stirring.
- a slurry obtained by adding and mixing the above Zr-containing aqueous solution to 202.68 g of cobalt oxyhydroxide having a conoleto content of 59.0% by weight was mixed with a powder dried at 80 ° C. and a carbonate having a lithium content of 18.7% by weight.
- zirconium contained in the lithium-containing composite oxide powder was 0.005 in atomic ratio with respect to the total of conoleto and zirconium.
- the atomic ratio (ZrZN) of the composite oxide was measured by XPS analysis in the same manner as in Example 1.
- Zr / N 0.49.
- An electrode and a battery were prepared and evaluated in the same manner as in Example 1 except that the positive electrode sheet was prepared using the above lithium-containing composite oxide.
- the initial weight capacity density of the positive electrode active material at 25 ° C. and 2.5 to 4.3 V was 158 mAhZg, and the capacity retention rate after 30 charge / discharge cycles was 98.8%. It was.
- the initial weight capacity density of the positive electrode active material at 25 ° C and 2.5 to 4.5 V is 188 mAh / g
- the capacity retention rate after 30 charge / discharge cycles was 89.2%.
- the heat generation start temperature of the heat generation curve of the 3V charged product is 161 ° C.
- the heat generation starting temperature of the 5V charged product was 141 ° C.
- the intermediate base material having the composition of LiCo ZrO obtained in Example 5 was used. Also,
- a Zr aqueous solution having a pH of 6.0 was prepared by adding 7.4 kg of water to 0.06 kg of an aqueous zirconium carbonate ammonium solution having a ruco-um content of 14.5% by weight. 10 kg of the intermediate base material was charged into a Ladige mixer, heated to 80 ° C. while mixing, and mixed and dried while spraying 7.5 kg of the Zr aqueous solution to obtain a zirconium-added powder. The zirconium-containing powder was heated at 450 ° C for 12 hours in an oxygen-containing atmosphere, and the average particle size was 12. 2 / ⁇ ⁇ , D10 force, S7.2 / ⁇ ⁇ , D90 force, 8 m. A complex oxide powder (composition; Li Co Zr 2 O 3) containing ⁇ ⁇ having a force of 0.32 m 2 / g was obtained. Contains lithium
- Zirconium contained in the composite oxide powder was 0.000020 in atomic ratio with respect to the total of cobalt and zirconium.
- the atomic ratio (ZrZN) of the composite oxide was measured by XPS analysis in the same manner as in Example 1.
- (Zr / N) 0.57.
- An electrode and a battery were prepared and evaluated in the same manner as in Example 1 except that the positive electrode sheet was prepared using the above lithium-containing composite oxide.
- the initial weight capacity density of the positive electrode active material at 25 ° C and 2.5 to 4.3 V was 160 mAhZg, and the capacity retention rate after 30 charge / discharge cycles was 99.1%. It was.
- the initial weight capacity density of the positive electrode active material at 25 ° C and 2.5 to 4.5 V is 183 mAh / g
- the capacity retention rate after 30 charge / discharge cycles was 89.4%.
- the heat generation start temperature of the heat generation curve of the 3V charged product is 163 ° C.
- the heat generation starting temperature of the 5V charged product was 143 ° C.
- This slurry was dried at 80 ° C., 77.04 g of lithium carbonate having a lithium content of 18.7 wt% was added and mixed, and the mixture was dried at 120 ° C. for 4 hours to obtain a dry powder.
- the dried powder was heated at 1010 ° C for 14 hours in an oxygen-containing atmosphere, the composition was Li Co Al Mg Zr O and the average grain size was
- the atomic ratio relative to the total of aluminum, magnesium, magnesium and zirconium was 0.000020.
- the X-ray diffraction spectrum was measured in the same manner as in Example 1.
- line, 2 0 66.5 ⁇ 1 ° (1
- the half-width of the diffraction peak of the 10) plane was 0.110 °.
- This powder has a press density of 3.02gZ cm.
- An electrode and a battery were prepared and evaluated in the same manner as in Example 1 except that the positive electrode sheet was prepared using the above lithium-containing composite oxide.
- the initial weight capacity density of the positive electrode active material at 25 ° C. and 2.5 to 4.3 V was 153 mAhZg, and the capacity retention rate after 30 charge / discharge cycles was 99.7%. It was.
- the initial weight capacity density of the positive electrode active material at 25 ° C. and 2.5 to 4.5 V was 184 mAh / g, and the capacity retention rate after 30 charge / discharge cycles was 92.8%.
- the heat generation start temperature of the heat generation curve of the 3V charged product is 175 ° C.
- the heat generation starting temperature of the 5V charged product was 150 ° C.
- Example 2 Evaluation was performed in the same manner as in Example 1 except that the material was not coated. Obtained approximately spherical lithium-containing composite oxide (composition; Li Co Al Mg Zr O
- An electrode and a battery were prepared and evaluated in the same manner as in Example 1 except that the positive electrode sheet was prepared using the above lithium-containing composite oxide.
- the initial weight capacity density of the positive electrode active material at 25 ° C and 2.5 to 4.3 V was 154 mAhZg, and the capacity retention rate after 30 charge / discharge cycles was 99.0%. It was.
- the initial weight capacity density of the positive electrode active material at 25 ° C. and 2.5 to 4.5 V was 185 mAh / g, and the capacity retention rate after 30 charge / discharge cycles was 88.9%.
- the heat generation start temperature of the heat generation curve of the 3V charged product is 174 ° C.
- the heat generation starting temperature of the 5V charged product was 149 ° C.
- a sulfuric acid aqueous solution containing nickel sulfate, cobalt sulfate and manganese sulfate, an aqueous ammonium sulfate solution, and an aqueous sodium hydroxide solution the pH of the slurry in the reaction vessel is 11.0, and the temperature is 50 °. While stirring so as to be C, each was continuously supplied to the reaction vessel. The amount of liquid in the reaction system is adjusted by the overflow method, and the overflowed coprecipitate slurry is filtered, washed with water, and then dried at 80 ° C to obtain nickel cobalt manganese composite hydroxide powder. It was.
- the obtained hydroxide was dispersed in a 6% by weight aqueous sodium persulfate solution containing 3% by weight of sodium hydroxide and stirred at 20 ° C for 12 hours, thereby obtaining nickel cobalt manganese composite oxyhydroxide.
- the product slurry was synthesized, and a composite hydroxy hydroxide powder was obtained through filtration and drying processes.
- the powder had a specific surface area of 9.6 m 2 / g as measured by the nitrogen adsorption method and an average particle diameter of 10.1 ⁇ m as measured using a laser single scattering particle size distribution analyzer.
- a predetermined amount of lithium carbonate powder having an average particle diameter of 20 ⁇ m was mixed with this composite oxyhydroxide powder and fired at 1000 ° C for 16 hours in an atmosphere maintained at an oxygen concentration of 40%. By mixing and grinding, an intermediate base material having a composition of Li Ni Co Mn O is obtained.
- the intermediate matrix is similar to the rhombohedral system (R-3m) in the powder X-ray diffraction spectrum using CuKa line. In SEM observation, this powder particle aggregates many primary particles to form secondary particles. And the shape is generally spherical or elliptical there were.
- zirconium carbonate ammonium having a zirconium content of 14.5% by weight (chemical formula: (NH 2) [Zr (CO 2) (OH)]) was added water to an aqueous solution to give a zirconium content of 1.58. weight 0/0
- a pH 8.5 aqueous solution of zirconium was prepared.
- Zirconium-added powder was obtained by spraying 6 g of the prepared zirconium aqueous solution to 100 g of the intermediate base material while stirring with a drum mixer. Sarakuko, this zirconium-added powder was calcined in air at 350 ° C for 12 hours to obtain a substantially spherical lithium-containing composite oxide powder according to the present invention (composition; Li Ni Co Mn Zr O
- the obtained lithium-containing composite oxide powder had an average particle size of 10.7 m, D10 of 5.5 m, D90 of 14.0 m, and a specific surface area of 0.47 m 2 Zg. .
- the diffraction peak of (110) plane at 2 0 65.1 ⁇ 1 °.
- the full width at half maximum was 0.228 °.
- the press density of this powder was 2.68 g / cm 3 .
- zirconium contained in the lithium-containing composite oxide powder was 0.0010 in atomic ratio with respect to the total of nickel, manganese, cobalt and zirconium.
- a positive electrode sheet was prepared in the same manner as in Example 1, a battery was assembled, and its characteristics were measured. 4.
- the initial weight capacity density of the positive electrode active material when charged to 3V is 158mAh / g, and the capacity retention rate after 30 charge / discharge cycles is 98.8%.
- the weight capacity density was 17 2 mAh / g, and the capacity retention rate after 30 charge / discharge cycles was 94.0%.
- the heat generation start temperature of 4.3V rechargeable products is 235 ° C
- the heat generation start temperature of 4.5V rechargeable products is 198 ° C.
- a lithium-containing acid compound blended to be O was synthesized. Average particle size is 10.5 m, D
- a thium-containing composite oxide powder was obtained.
- an X-ray diffraction spectrum was obtained using an X-ray diffraction apparatus (RINT 2100 type, manufactured by Rigaku Corporation).
- RINT 2100 type manufactured by Rigaku Corporation
- the press density was 2.70 gZcm 3 .
- a positive electrode sheet was prepared in the same manner as in Example 1, a battery was assembled, and its characteristics were measured. 4.
- the initial weight capacity density of the positive electrode active material when charged to 3V is 160mAh / g
- the capacity retention rate after 30 charge / discharge cycles is 95.0%
- the initial weight when charged to 4.5V The capacity density was 175 mAhZg
- the capacity retention rate after 30 charge / discharge cycles was 91.0%.
- the heat generation start temperature of the 4.3V rechargeable product was 232 ° C
- the heat generation start temperature of the 4.5V rechargeable product was 199 ° C.
- the present invention has a high operating voltage, a high volume capacity density, and a high safety, which are suitable for non-aqueous electrolyte secondary batteries such as a lithium secondary battery having a small size, light weight, and high energy density.
- a positive electrode active material having excellent charge / discharge cycle characteristics is provided.
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Cited By (11)
Publication number | Priority date | Publication date | Assignee | Title |
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WO2009057777A1 (ja) * | 2007-11-01 | 2009-05-07 | Agc Seimi Chemical Co., Ltd. | リチウム二次電池正極活物質の原料用遷移金属化合物の造粒体粉末及びその製造方法 |
WO2011052607A1 (ja) * | 2009-10-29 | 2011-05-05 | Agcセイミケミカル株式会社 | リチウムイオン二次電池用正極材料の製造方法 |
WO2011065391A1 (ja) * | 2009-11-26 | 2011-06-03 | 日本化学工業株式会社 | リチウム二次電池用正極活物質、その製造方法及びリチウム二次電池 |
EP2413415A1 (en) | 2010-07-30 | 2012-02-01 | Sanyo Electric Co., Ltd. | Non-aqueous electrolyte secondary cell |
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JP6472520B2 (ja) | 2014-12-05 | 2019-02-20 | エルジー・ケム・リミテッド | 正極活物質の製造方法 |
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JP2013171743A (ja) * | 2012-02-21 | 2013-09-02 | Sumitomo Metal Mining Co Ltd | ニッケルコバルト複合水酸化物及びその製造方法 |
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JPWO2007102407A1 (ja) | 2009-07-23 |
US20080160414A1 (en) | 2008-07-03 |
TWI365561B (ja) | 2012-06-01 |
TW200810205A (en) | 2008-02-16 |
KR20130016399A (ko) | 2013-02-14 |
KR20080009147A (ko) | 2008-01-24 |
CN101331631B (zh) | 2010-09-29 |
KR101278376B1 (ko) | 2013-06-25 |
US8101300B2 (en) | 2012-01-24 |
CN101331631A (zh) | 2008-12-24 |
KR101260539B1 (ko) | 2013-05-06 |
JP5192818B2 (ja) | 2013-05-08 |
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