CN105185982A - Cathode material and preparation method thereof and lithium-ion battery - Google Patents
Cathode material and preparation method thereof and lithium-ion battery Download PDFInfo
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- CN105185982A CN105185982A CN201510547245.0A CN201510547245A CN105185982A CN 105185982 A CN105185982 A CN 105185982A CN 201510547245 A CN201510547245 A CN 201510547245A CN 105185982 A CN105185982 A CN 105185982A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/48—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides
- H01M4/50—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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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/36—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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- 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
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
- H01M4/628—Inhibitors, e.g. gassing inhibitors, corrosion inhibitors
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The invention provides a cathode material, which comprises a base material and an aluminum oxide layer, wherein the base material is prepared from a compound as shown in a formula I and a compound as shown in a formula II; the compound as shown in the formula I has a secondary particle morphology which is formed by agglomeration of a plurality of single crystal grains; the compound as shown in the formula II has a single-crystal structure; and the aluminum oxide layer coats the surface of the base material. The base material in the cathode material provided by the invention is prepared from the compound with the particle morphology and the compound with the single-crystal structure; due to the two morphologies of compounds, the cathode material has relatively good capacity characteristic; and the processability can also be improved. The aluminum oxide layer coats the surface of the base material in the cathode material provided by the invention; corrosion to the surface layer of the cathode material caused by moisture and HF in a battery can be avoided or reduced by coating of the aluminum oxide layer; and due to the cathode material with an aluminum oxide layer coating layer, the prepared lithium-ion battery has relatively high working voltage and heat stability. The invention further provides a preparation method of the cathode material and the lithium-ion battery.
Description
Technical field
The present invention relates to cell art, particularly relate to a kind of positive electrode and preparation method thereof and lithium ion battery.
Background technology
Lithium ion battery because its energy density is high, good cycle, environmental friendliness and the advantage such as non-maintaining instead of traditional storage battery, on a large scale as new battery power.Along with the intelligent develop rapidly of electronic information technologies and portable set, the digital products such as mobile phone, notebook computer and camera are the energy density of 3C field to lithium ion battery of representative, cycle performance and security performance are had higher requirement.For lithium ion battery, the capacity density improving positive electrode active materials can the flying power of raising lithium ion battery of high degree.
Nickel-cobalt-manganternary ternary anode material is the anode material for lithium-ion batteries comparatively widely applied in the market, the effective ways improving capacity of lithium ion battery are the use voltage improving lithium ion battery, and the use voltage of general lithium ion battery improves the capacity that 0.1V can improve battery 5% ~ 15%; But the nickel cobalt manganese anode material of routine is after use voltage is more than 4.2V, positive electrode surface can excessively de-Li
+, cause the destruction of surface texture, simultaneously by electrolyte oxidation, form abundant " protectiveness " SEI film of one deck on both positive and negative polarity surface, stop Li
+deintercalation between both positive and negative polarity, macroscopically makes lithium ion battery show the phenomenon of cycle performance sharp-decay.
Prior art improves the high voltage capability of lithium ion battery usually from modification electrolyte prescription and positive electrode finishing two aspect, carrying out coated to positive electrode is method conventional at present, but the especially nickelic positive electrode of nickel cobalt manganese anode material through wash coated after, there is the phenomenon of sharp-decay on the contrary in circulation.Therefore, be badly in need of the positive electrode that a kind of capacity characteristic is good in the market, lithium ion battery prepared by this positive electrode has good battery capacity.
Summary of the invention
In view of this, the object of the present invention is to provide a kind of positive electrode and preparation method thereof and lithium ion battery, positive electrode provided by the invention has good capacity characteristic, and lithium ion battery prepared by this positive electrode has good battery capacity.
The invention provides a kind of positive electrode, comprising:
Base material, described base material is prepared by the compound shown in the compound shown in formula I and formula II:
Li
(1+a1)ni
x1co
y1m
z1o
2formula I;
Li
(1+a2)ni
x2co
y2mn
z2m '
(1-x2-y2-z2)o
2formula II;
Wherein ,-0.1≤a1≤0.12,0.5 < x1 < 1, x1+y1+z1=1,
-0.1≤a2≤0.12，0＜x2≤0.5，0.98≤x2+y2+z2≤1；
M and M ' is independently selected from one or more in Cu, Zn, Mg, Al, Cd, Zr, Ti, Fe and Mo;
Compound shown in described formula I has the second particle pattern that multiple single crystal grain is reunited;
Compound shown in described formula II has mono-crystalline structures;
Be coated on the alumina layer of described substrate surface.
Preferably, the thickness of described alumina layer is 2 nanometer ~ 50 nanometers.
Preferably, the particle diameter of compound shown in described formula I is 12 microns ~ 20 microns.
Preferably, the average grain diameter of compound shown in described formula II is A, 0 < A≤6.5 micron.
Preferably, the mass ratio of the compound shown in the compound shown in described formula I and formula II is (30 ~ 85): (70 ~ 15).
In positive electrode provided by the invention, base material is prepared by the compound of granule-morphology and the compound of mono-crystalline structures, the compound of these two kinds of patterns is blended, especially the mixing of mono-crystalline structures compound, the alkalinity on positive electrode surface provided by the invention can be reduced, improve the pressed density of positive plate in cell manufacturing process, positive electrode provided by the invention is made to have better capacity characteristic, also improve its processing characteristics, thus lithium ion battery prepared by positive electrode provided by the invention has higher capacity; And substrate surface is coated with alumina layer in positive electrode provided by the invention, alumina layer coated can to avoid or reduce in battery moisture and HF to the erosion of positive pole material surface, and this positive electrode with alumina-coated layer can make the lithium ion battery prepared have higher operating voltage and thermal stability.Experimental result shows, lithium ion battery prepared by positive electrode provided by the invention in 3V ~ 4.4V voltage range at 0.5mA/cm
2current density under carry out charge-discharge test, discharge capacity is 182mAh/g ~ 187.6mAh/g first, at 5mA/cm
2current density lower 45 DEG C circulation 300 capability retentions be 87.1% ~ 93.4%.
In addition, the lithium ion battery that positive electrode provided by the invention prepares has good non-oxidizability under the condition that operating voltage is higher, and fail safe is better.
The invention provides the preparation method of the positive electrode described in a kind of technique scheme, comprising:
By the compound shown in the compound shown in formula I and formula II, obtain base material;
Li
(1+a1)ni
x1co
y1m
z1o
2formula I;
Li
(1+a2)ni
x2co
y2mn
z2m '
(1-x2-y2-z2)o
2formula II;
Wherein ,-0.1≤a1≤0.12,0.5 < x1 < 1, x1+y1+z1=1,
-0.1≤a2≤0.12，0＜x2≤0.5，0.98≤x2+y2+z2≤1；
M and M ' is independently selected from one or more in Cu, Zn, Mg, Al, Cd, Zr, Ti, Fe and Mo;
Compound shown in described formula I has the second particle pattern that multiple single crystal grain is reunited;
Compound shown in described formula II has mono-crystalline structures;
In a solvent, by solvent evaporated after described base material and the mixing of aluminium isopropoxide solution, coated product is obtained;
Described coated product is carried out roasting, obtains positive electrode.
Preferably, the temperature of described solvent evaporated is 40 DEG C ~ 80 DEG C.
Preferably, described solvent comprises one or more in alcohol compound, ether compound and ketone compounds.
Preferably, the temperature of described roasting is 400 DEG C ~ 700 DEG C.
The preparation method of positive electrode provided by the invention, the compound of granule-morphology and monocrystalline pattern is obtained base material, and at substrate surface coated aluminum oxide layer, the positive electrode that this method prepares has good capacity characteristic, and lithium ion battery prepared by positive electrode prepared by this method has higher capacity, operating voltage and thermal stability.In addition, lithium ion battery prepared by the positive electrode that method provided by the invention prepares also has good non-oxidizability under the condition that operating voltage is higher, and fail safe is better.
The invention provides a kind of lithium ion battery, the positive electrode of described lithium ion battery is the positive electrode described in technique scheme, or the positive electrode that the method described in technique scheme prepares.
Lithium ion battery provided by the invention adopts the positive electrode described in technique scheme to prepare, and lithium ion battery prepared by this positive electrode has higher capacity, operating voltage and thermal stability.In addition, lithium ion battery provided by the invention also has good non-oxidizability under the condition that operating voltage is higher, and fail safe is better.
Embodiment
Be clearly and completely described to the technical scheme in the embodiment of the present invention below, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
The invention provides a kind of positive electrode, comprising:
Base material, described base material is prepared by the compound shown in the compound shown in formula I and formula II:
Li
(1+a1)ni
x1co
y1m
z1o
2formula I;
Li
(1+a2)ni
x2co
y2mn
z2m '
(1-x2-y2-z2)o
2formula II;
Wherein ,-0.1≤a1≤0.12,0.5 < x1 < 1, x1+y1+z1=1,
-0.1≤a2≤0.12，0＜x2≤0.5，0.98≤x2+y2+z2≤1；
M and M ' is independently selected from one or more in Cu, Zn, Mg, Al, Cd, Zr, Ti, Fe and Mo;
Compound shown in described formula I has the second particle pattern that multiple single crystal grain is reunited;
Compound shown in described formula II has mono-crystalline structures;
Be coated on the alumina layer of described substrate surface.
Positive electrode provided by the invention comprises base material, and described base material is prepared by the compound shown in the compound shown in formula I and formula II.In the present invention, in described formula I ,-0.1≤a1≤0.12; In an embodiment of the present invention, in described formula I, 0≤a1≤0.1.In the present invention, in described formula I, 0.5 < x1 < 1; In an embodiment of the present invention, in described formula I, 0.6 < x1 < 0.9; In other examples, in described formula I, 0.7 < x1 < 0.8.In an embodiment of the present invention, in described formula I, 0.05≤y1≤0.3; In other examples, in described formula I, 0.1≤y1≤0.2.In an embodiment of the present invention, in described formula I, 0 < z1≤0.1; In other examples, in described formula I, 0.02≤z1≤0.08; In a further embodiment, in described formula I, 0.04≤z1≤0.06.In the present invention, x1+y1+z1=1.
In the present invention, in described formula I, M comprises one or more in Cu, Zn, Mg, Al, Cd, Zr, Ti, Fe and Mo; In an embodiment of the present invention, in described formula I, M is Cu, Zn, Mg, Al, Cd, Zr, Ti, Fe or Mo.In an embodiment of the present invention, the quality of described M is 0.01% ~ 0.5% of the compound quality shown in formula I; In other examples, the quality of described M is 0.05% ~ 0.4% of the compound quality shown in formula I; In a further embodiment, the quality of described M is 0.1% ~ 0.3% of the compound quality shown in formula I.
In the present invention, the compound shown in described formula I has the second particle pattern that multiple single crystal grain is reunited.In an embodiment of the present invention, the pattern of described crystal grain is spherical or class is spherical, and its particle diameter is 0.1 micron ~ 5 microns; In other examples, the particle diameter of described crystal grain is 0.5 micron ~ 4 microns; In a further embodiment, the particle diameter of described crystal grain is 1 micron ~ 3 microns.In the present invention, using described single crystal grain as primary particle, the particle of being reunited by described single crystal grain is as second particle.In an embodiment of the present invention, the particle diameter of the compound shown in described formula I is 12 microns ~ 20 microns; In other examples, the particle diameter of the compound shown in described formula I is 14 microns ~ 18 microns.
In the present invention, in described formula II ,-0.1≤a2≤0.12; In an embodiment of the present invention, in described formula II, 0≤a2≤0.1.In the present invention, in described formula II, 0 < x2≤0.5; In an embodiment of the present invention, in described formula II, 0.1≤x2≤0.4; In other examples, in described formula II, 0.2≤x2≤0.3.In an embodiment of the present invention, in described formula II, 0 < y2≤0.4; In other examples, in described formula II, 0.1≤y2≤0.3.In an embodiment of the present invention, in described formula II, 0 < z2≤0.4; In other examples, in described formula II, 0.1≤z2≤0.3.In the present invention, 0.98≤x2+y2+z2≤1.
In the present invention, in described formula II, M ' comprises one or more in Cu, Zn, Mg, Al, Cd, Zr, Ti, Fe and Mo; In an embodiment of the present invention, in described formula II, M ' is Cu, Zn, Mg, Al, Cd, Zr, Ti, Fe or Mo.In an embodiment of the present invention, the quality of described M ' is 0.01% ~ 0.5% of the compound quality shown in formula II; In other examples, the quality of described M ' is 0.05% ~ 0.4% of the compound quality shown in formula II; In a further embodiment, the quality of described M ' is 0.1% ~ 0.3% of the compound quality shown in formula II.
In the present invention, the compound shown in described formula II has mono-crystalline structures, containing the single crystal grain that multiple crystal orientation is identical in the compound shown in formula II.In an embodiment of the present invention, the average grain diameter of the compound shown in described formula II is A, 0 < A≤6.5 micron; In other examples, the average grain diameter of the compound shown in described formula II is 0.5 micron ~ 6 microns; In a further embodiment, the average grain diameter of the compound shown in described formula II is 2 microns ~ 4 microns.
In an embodiment of the present invention, the mass ratio of the compound shown in the compound shown in described formula I and formula II is (30 ~ 85): (70 ~ 15); In other examples, the mass ratio of the compound shown in the compound shown in described formula I and formula II is (40 ~ 70): (60 ~ 30); In a further embodiment, the mass ratio of the compound shown in the compound shown in described formula I and formula II is (50 ~ 60): (50 ~ 40).
Positive electrode provided by the invention comprises the alumina layer being coated on described substrate surface.In an embodiment of the present invention, the thickness of described alumina layer is 2 nanometer ~ 50 nanometers; In other examples, the thickness of described alumina layer is 5 nanometer ~ 40 nanometers; In a further embodiment, the thickness of described alumina layer is 20 nanometer ~ 30 nanometers.In an embodiment of the present invention, the quality of described alumina layer is 0.05% ~ 0.5% of described positive electrode quality; In other examples, the quality of described alumina layer is 0.1% ~ 0.4% of described positive electrode quality; In a further embodiment, the quality of described alumina layer is 0.2% ~ 0.3% of described positive electrode quality.
In an embodiment of the present invention, the granularity of described positive electrode is B, 0 < B≤50 micron; In other examples, the granularity of described positive electrode is 5 microns ~ 40 microns; In a further embodiment, the granularity of described positive electrode is 10 microns ~ 30 microns.
The invention provides the preparation method of the positive electrode described in a kind of technique scheme, comprising:
By the compound shown in the compound shown in formula I and formula II, obtain base material;
Li
(1+a1)ni
x1co
y1m
z1o
2formula I;
Li
(1+a2)ni
x2co
y2mn
z2m '
(1-x2-y2-z2)o
2formula II;
Wherein ,-0.1≤a1≤0.12,0.5 < x1 < 1, x1+y1+z1=1,
-0.1≤a2≤0.12，0＜x2≤0.5，0.98≤x2+y2+z2≤1；
M and M ' is independently selected from one or more in Cu, Zn, Mg, Al, Cd, Zr, Ti, Fe and Mo;
Compound shown in described formula I has the second particle pattern that multiple single crystal grain is reunited;
Compound shown in described formula II has mono-crystalline structures;
In a solvent, by solvent evaporated after described base material and the mixing of aluminium isopropoxide solution, coated product is obtained;
Described coated product is carried out roasting, obtains positive electrode.
The present invention, by the compound shown in the compound shown in formula I and formula II, obtains base material.In the present invention, the compound shown in the compound shown in the compound shown in described formula I with the compound shown in formula II with the formula I described in technique scheme and formula II is consistent, does not repeat them here.
In an embodiment of the present invention, the preparation method of the compound shown in described formula I is:
Ni
x1co
y1m
z1(OH)
2with lithium hydroxide (LiOHH
2o) 1:(0.95 ~ 1.15 in molar ratio) ratio mixing, obtain mixture;
Described mixture is calcined at 700 DEG C ~ 900 DEG C, obtains sintered product;
By described sintered product cooling down, obtain the compound shown in formula I.
In the present invention, Ni
x1co
y1m
z1(OH)
2in x1, y1 consistent with x1, y1 and the z1 described in technique scheme with z1, do not repeat them here.In an embodiment of the present invention, the calcining heat of described mixture can be 750 DEG C ~ 850 DEG C.In an embodiment of the present invention, by the time of described mixed calcining be 6 hours ~ 10 hours.In an embodiment of the present invention, the programming rate in described calcination process is 1 DEG C/min ~ 5 DEG C/min; In other examples, the programming rate in described calcination process is 2 DEG C/min ~ 4 DEG C/min.In an embodiment of the present invention, under the atmosphere of oxygen, described mixture can be calcined.In an embodiment of the present invention, the speed of described sintered product cooling down be 1 DEG C/min ~ 5 DEG C/min; In other examples, the speed of described sintered product cooling down be 2 DEG C/min ~ 4 DEG C/min.In an embodiment of the present invention, fragmentation after sintered product cooling down is sieved, obtains the compound shown in formula I.
In an embodiment of the present invention, in the compound process shown in preparation formula I, the charging method of tight dress or pine dress is adopted to be prepared, the height≤8cm of described charging.
In an embodiment of the present invention, the preparation method of the compound shown in described formula II is:
By Ni
x2co
y2mn
z2m '
(1-x2-y2-z2)(OH)
2with lithium carbonate (Li
2cO
3) 1:(0.48 ~ 0.56 in molar ratio) ratio mixing, obtain mix products;
Described mix products is calcined at 800 DEG C ~ 1000 DEG C, obtains calcined product;
By described calcined product cooling down, obtain the compound shown in formula II.
In the present invention, Ni
x2co
y2mn
z2m '
(1-x2-y2-z2)(OH)
2in x2, y2, z2 consistent with x2, y2, the z2 in technique scheme, do not repeat them here.In an embodiment of the present invention, the calcining heat of described mix products is 850 DEG C ~ 950 DEG C.In an embodiment of the present invention, the time of described mix products calcining is 4 hours ~ 12 hours; In other examples, the time of described mix products calcining is 6 hours ~ 10 hours.In an embodiment of the present invention, the programming rate in described calcination process is 1 DEG C/min ~ 3 DEG C/min; In other examples, the programming rate in described calcination process is 1.5 DEG C/min ~ 2.5 DEG C/min.In an embodiment of the present invention, under the atmosphere of oxygen, described mix products can be calcined.In an embodiment of the present invention, the speed of described cooling down be 1 DEG C/min ~ 3 DEG C/min; In other examples, the speed of described cooling down be 1.5 DEG C/min ~ 2.5 DEG C/min.In an embodiment of the present invention, the compound shown in formula II is obtained by after broken for the calcined product gas obtained sieving.
In an embodiment of the present invention, in the process of the compound shown in preparation formula II, charging method is pine dress, the height≤6cm of described charging.
After obtaining base material, in a solvent, by solvent evaporated after described base material and the mixing of aluminium isopropoxide solution, obtain coated product, method for coating technique provided by the invention is simple in the present invention.In an embodiment of the present invention, can by described base material dispersion in a solvent, solvent evaporated after the dispersion obtained and aluminium isopropoxide solution being mixed, obtains coated product.In an embodiment of the present invention, the method for described dispersion is for stirring.In an embodiment of the present invention, the time of described stirring is 2 minutes ~ 5 minutes.In an embodiment of the present invention, evaporate to dryness can be carried out under the condition stirred, remove solvent.In an embodiment of the present invention, the temperature of described solvent evaporated is 40 DEG C ~ 80 DEG C; In other examples, the temperature of described solvent evaporated is 50 DEG C ~ 70 DEG C; In a further embodiment, the temperature of described solvent evaporated is 55 DEG C ~ 65 DEG C.
In an embodiment of the present invention, described solvent comprises one or more in alcohol compound, ether compound and ketone compounds; In other examples, described solvent comprises one or more in ethanol, propyl alcohol, ether, isopropyl ether, acetone, methyl isopropyl ketone and methylethylketone.In an embodiment of the present invention, the solvent in described aluminium isopropoxide solution is alcohol.In an embodiment of the present invention, the mass concentration of described aluminium isopropoxide solution is 3% ~ 7%; In other examples, the mass concentration of described aluminium isopropoxide solution is 4% ~ 6%; In a further embodiment, the mass concentration of described aluminium isopropoxide solution is 5%.
After obtaining coated product, described coated product is carried out roasting by the present invention, obtains positive electrode.In an embodiment of the present invention, the temperature of described roasting is 400 DEG C ~ 700 DEG C; In other examples, the temperature of described roasting is 500 DEG C ~ 600 DEG C.In an embodiment of the present invention, the time of described roasting is 4 hours ~ 12 hours; In other examples, the time of described roasting is 6 hours ~ 10 hours.In an embodiment of the present invention, described roasting can be carried out under the atmosphere of oxygen or air.
In an embodiment of the present invention, the method for described roasting is:
Described coated product is warming up to sintering temperature and carries out roasting, by the product of roasting cooling down obtained.In an embodiment of the present invention, the speed of described intensification be 1 DEG C/min ~ 8 DEG C/min; In other examples, the speed of described intensification be 3 DEG C/min ~ 6 DEG C/min.In an embodiment of the present invention, the speed of described cooling be 1 DEG C/min ~ 10 DEG C/min; In other examples, the speed of described cooling be 3 DEG C/min ~ 7 DEG C/min; In a further embodiment, the speed of described cooling be 4 DEG C/min ~ 6 DEG C/min.In an embodiment of the present invention, the method for described cooling is cool with stove.
In an embodiment of the present invention, after described roasting completes, the product of roasting obtained is sieved, obtain positive electrode.In an embodiment of the present invention, the order number sieved described in is 350 order ~ 450 orders; In other examples, the order number sieved described in is 380 order ~ 420 orders; In a further embodiment, the order number sieved described in is 400 orders.
The invention provides a kind of lithium ion battery, the positive electrode of described lithium ion battery is the positive electrode described in technique scheme, or the positive electrode that the method described in technique scheme prepares.In the present invention, the positive electrode described in technique scheme has good capacity characteristic, and the lithium ion battery that this positive electrode prepares has higher capacity, operating voltage and thermal stability.In addition, lithium ion battery prepared by this positive electrode also has good non-oxidizability under the condition that operating voltage is higher, and fail safe is better.
The preparation method of the present invention to described lithium ion battery does not have special restriction, and the technical scheme adopting employing positive electrode well known to those skilled in the art to prepare lithium ion battery prepares.In an embodiment of the present invention, the preparation method of described lithium ion battery is:
Positive plate, negative plate, barrier film and electrolyte are assembled, prepare lithium ion battery, described positive plate is prepared by the positive electrode described in technique scheme.
In an embodiment of the present invention, described positive plate preparation method is:
Positive electrode provided by the invention, polyvinylidene fluoride, conductive agent and METHYLPYRROLIDONE are mixed, obtains anode sizing agent;
Described anode sizing agent is coated on aluminium foil surface dry, obtains intermediate product;
By again dry after described intermediate product compressing tablet, obtain positive plate.
In an embodiment of the present invention, under the condition stirred, positive electrode, polyvinylidene fluoride, conductive agent and METHYLPYRROLIDONE can be mixed.In an embodiment of the present invention, the thickness of described coating is 0.05mm ~ 0.4mm; In other examples, the thickness of described coating is 0.1mm ~ 0.3mm; In a further embodiment, the thickness of described coating is 0.15mm ~ 0.25mm.In an embodiment of the present invention, the temperature of described drying is 75 DEG C ~ 85 DEG C; In other examples, the temperature of described drying is 80 DEG C.In an embodiment of the present invention, the method for described drying is vacuum drying.In an embodiment of the present invention, the thickness of described compressing tablet is 0.03mm ~ 0.25mm; In other examples, the thickness of described compressing tablet is 0.05mm ~ 0.2mm; In a further embodiment, the thickness of described compressing tablet is 0.1mm ~ 0.15mm.In an embodiment of the present invention, described again dry temperature is 85 DEG C ~ 95 DEG C; In other examples, described again dry temperature is 90 DEG C.In an embodiment of the present invention, described again dry method is vacuum drying.In an embodiment of the present invention, by the dry rear section again of described intermediate product, positive plate is obtained.
In an embodiment of the present invention, described conductive agent comprises one or more in native graphite, Delanium, carbon black, acetylene black, Ketjen black, carbon nano-tube, the carbon derivative of fullerene, carbon fiber, metallic fiber and metal dust.In an embodiment of the present invention, the metal in described metal dust comprises one or more in carbon fluorine metal compound, al and ni.
In an embodiment of the present invention, the mass ratio of described positive electrode, polyvinylidene fluoride (PVDF) and conductive agent is 1:(0.01 ~ 0.05): (0.01 ~ 0.05); In other examples, the mass ratio of described positive electrode, polyvinylidene fluoride (PVDF) and conductive agent is 1:(0.02 ~ 0.04): (0.02 ~ 0.04).In an embodiment of the present invention, the mass content of the mixture of described positive electrode, PVDF and conductive agent in anode sizing agent is 30% ~ 70%; In other examples, the mass content of the mixture of described positive electrode, PVDF and conductive agent in anode sizing agent is 40% ~ 60%.
In an embodiment of the present invention, the preparation method of described negative plate is:
Negative material, conductive agent, sodium carboxymethylcellulose (CMC) and butadiene-styrene rubber (SBR) are mixed, obtains cathode size;
Again dry after described cathode size being coated in dry after copper foil surface, compressing tablet, obtain negative plate.
In an embodiment of the present invention, described negative material is graphite; In other examples, described negative material is Delanium.In the present invention, described conductive agent is consistent with the conductive agent described in technique scheme, does not repeat them here.
In an embodiment of the present invention, the mass ratio of described negative material, conductive agent and CMC is 1:(0.01 ~ 0.1): (0.01 ~ 0.05); In other examples, the mass ratio of described negative material, conductive agent and CMC is 1:(0.02 ~ 0.06): (0.02 ~ 0.04).In an embodiment of the present invention, the mass content of the mixture of described negative material, conductive agent and CMC in cathode size is 25% ~ 65%; In other examples, the mixture of described negative material, conductive agent and CMC mass content is in the slurry 30% ~ 60%.
In the present invention, the coating in described negative plate preparation process, drying, compressing tablet and again dry method are consistent with the coating prepared described in technique scheme in positive plate process, drying, compressing tablet and again dry method, do not repeat them here.
In an embodiment of the present invention, described barrier film is microporous polypropylene membrane, as cellgard2000.In an embodiment of the present invention, described electrolyte is lithium hexafluorophosphate solution.In an embodiment of the present invention, the solvent of described lithium hexafluorophosphate solution is ethylene carbonate (EC) and dimethyl carbonate (DMC).In an embodiment of the present invention, the volume ratio of described EC and DMC is (0.8 ~ 1.2): 1; In other examples, the volume ratio 1:1 of described EC and DMC.In an embodiment of the present invention, the molar concentration of described lithium hexafluorophosphate solution is 0.8mol/L ~ 1.2mol/L; In other examples, the molar concentration of described lithium hexafluorophosphate solution is 1mol/L.In an embodiment of the present invention, also comprise protective agent in described lithium hexafluorophosphate solution, described protective agent comprises fluoroethylene carbonate (FEC), propene sultone (PRS) or fluoro propylene carbonate (FPC).In an embodiment of the present invention, the mass content of described protective agent in lithium hexafluorophosphate solution is 0.1% ~ 10%; In other examples, the mass content of described protective agent in lithium hexafluorophosphate solution is 0.5% ~ 8%; In a further embodiment, the mass content of described protective agent in lithium hexafluorophosphate solution is 1% ~ 6%.
Test the chemical property of lithium ion battery prepared by positive electrode provided by the invention, prepare lithium ion battery by the following method, be specially:
By positive electrode provided by the invention, polyvinylidene fluoride (PVDF) and CNT (carbon nano-tube) in mass ratio for the ratio of 1:0.03:0.025 mixes, METHYLPYRROLIDONE (NMP) is added in the mixture obtained, obtain anode sizing agent, the solid content in described anode sizing agent is 60%; By described slurry agitation evenly after, be entirely coated in aluminium foil surface, coating thickness is 0.2mm, by the aluminium foil vacuum drying at 80 DEG C after coating slurry, tabletted cut after at 90 DEG C vacuum drying again, obtaining thickness is 0.1mm positive plate;
By Delanium, carbon nano-tube and sodium carboxymethylcellulose in mass ratio for the ratio of 1:0.03:0.025 mixes, in the mixture obtained, add butadiene-styrene rubber, obtain cathode size, the solid content in described cathode size is 60%; Described cathode size to be coated in after copper foil surface vacuum drying at 80 DEG C, tabletted cut after at 90 DEG C vacuum drying again, obtain the negative plate that thickness is 0.1mm;
By the LiPF of above-mentioned positive plate, cellgard2000 microporous polypropylene membrane, negative plate and 1mol/L
6solution is assembled, and prepares lithium ion battery, described LiPF
6eC and DMC of to be volume ratio the be 1:1 of the solvent in solution is wherein that the fluoroethylene carbonate of 5% is as protective agent containing mass concentration.
Carry out charge-discharge test after the above-mentioned lithium ion battery prepared at room temperature is placed 24 hours, the voltage range of discharge and recharge is 3.0V ~ 4.4V, at 0.5mA/cm under the environment of 25 DEG C ± 1 DEG C
2current density under the capacity first of the above-mentioned lithium ion battery of charge-discharge test, under the environment of 45 DEG C ± 1 DEG C, with 5mA/cm
2current density test above-mentioned lithium ion battery and to circulate the capability retention of 300 times; Test result is, the lithium ion battery that positive electrode provided by the invention prepares in 3V ~ 4.4V voltage range at 0.5mA/cm
2current density under carry out charge-discharge test, discharge capacity is 182mAh/g ~ 187.6mAh/g first, at 5mA/cm
2current density lower 45 DEG C circulation 300 capability retentions be 87.1% ~ 93.4%.
Raw material used by following examples of the present invention is commercial goods.
Embodiment 1
Prepare Li (Ni by the following method
0.8co
0.1mn
0.1) O
2granular materials:
By Ni
0.8co
0.1mn
0.1(OH)
2with lithium hydroxide (LiOHH2O) in molar ratio 1:1 ratio uniform mixing, obtain mixture;
By described mixture under the atmosphere of oxygen, be warming up to the programming rate of 3 DEG C/min the calcining that 800 DEG C are carried out 8h, obtain sintered product;
Described sintered product is sieved with fragmentation after 3 DEG C/min speed cooling down, obtains Li (Ni
0.8co
0.1mn
0.1) O
2granular materials.
Prepare Li by the following method
1.02(Ni
0.5co
0.2mn
0.28al
0.02) O
2the material of mono-crystalline structures:
By Ni
0.5co
0.2mn
0.28al
0.02(OH)
2with lithium carbonate (Li
2cO
3) in molar ratio 1:0.5 ratio uniform mixing, obtain mix products;
By described mix products under the atmosphere of oxygen, be warming up to the speed of 1 DEG C/min the calcining that 930 DEG C are carried out 6h, obtain calcined product;
Described calcined product is sieved so that gas is broken after the speed cooling down of 1 DEG C/min, obtains Li
1.02(Ni
0.5co
0.2mn
0.28al
0.02) O
2the material of mono-crystalline structures.
By the Li (Ni that the above-mentioned granularity D50 of 90g is 15 microns
0.8co
0.1mn
0.1) O
2the above-mentioned granularity D50 of granular materials and 10g is the Li of 5 microns of mono-crystalline structures
1.02(Ni
0.5co
0.2mn
0.28al
0.02) O
2material mixes, and obtains base material;
Be evenly dispersed in the alcohol solvent of 100g by described base material, the mass fraction adding 20g in the dispersion soln obtained is aluminium isopropoxide (AIP) alcoholic solution of 5%, stirs solvent evaporated, obtain coated product at the temperature of 60 DEG C;
By described coated product roasting 8h at 550 DEG C in air atmosphere, then with stove cooling, cross 400 eye mesh screens, obtain positive electrode.
According to the method described in technique scheme, the discharge capacity first of lithium ion battery prepared by the positive electrode that the test embodiment of the present invention 1 prepares and 45 DEG C of circulations, 300 capability retentions; Test result is, lithium ion battery prepared by the positive electrode that the embodiment of the present invention 1 prepares in 3V ~ 4.4V voltage range at 0.5mA/cm
2current density under carry out charge-discharge test, discharge capacity is 180.3mAh/g first, at 5mA/cm
2current density lower 45 DEG C circulation 300 capability retentions be 87.1%.
Embodiment 2
Li (Ni is prepared according to the method described in embodiment 1
0.8co
0.1mn
0.1) O
2granular materials and Li
1.02(Ni
0.5co
0.2mn
0.28al
0.02) O
2the material of mono-crystalline structures;
By the Li (Ni that the above-mentioned granularity D50 of 80g is 15 microns
0.8co
0.1mn
0.1) O
2the granularity D50 of granular materials and 20g is the Li of 5 microns of mono-crystalline structures
1.02(Ni
0.5co
0.2mn
0.28al
0.02) O
2material mixes, and obtains base material;
Be evenly dispersed in the alcohol solvent of 100g by described base material, the mass fraction adding 1g in the dispersion soln obtained is aluminium isopropoxide (AIP) alcoholic solution of 5%, stirs solvent evaporated, obtain coated product at the temperature of 60 DEG C;
By described coated product roasting 8h at 550 DEG C in air atmosphere, then with stove cooling, cross 400 eye mesh screens, obtain positive electrode.
According to the method described in technique scheme, the discharge capacity first of lithium ion battery prepared by the positive electrode that the test embodiment of the present invention 2 prepares and 45 DEG C of circulations, 300 capability retentions; Test result is, lithium ion battery prepared by the positive electrode that the embodiment of the present invention 2 prepares in 3V ~ 4.4V voltage range at 0.5mA/cm
2current density under carry out charge-discharge test, discharge capacity is 182.0mAh/g first, at 5mA/cm
2current density lower 45 DEG C circulation 300 capability retentions be 89.5%.
Embodiment 3
Li (Ni is prepared according to the method described in embodiment 1
0.8co
0.1mn
0.1) O
2granular materials and Li
1.02(Ni
0.5co
0.2mn
0.28al
0.02) O
2the material of mono-crystalline structures;
By the Li (Ni that the above-mentioned granularity D50 of 50g is 15 microns
0.8co
0.1mn
0.1) O
2the granularity D50 of granular materials and 50g is the Li of 5 microns of mono-crystalline structures
1.02(Ni
0.5co
0.2mn
0.28al
0.02) O
2material mixes, and obtains base material;
Be evenly dispersed in the alcohol solvent of 100g by described base material, the mass fraction adding 1g in the dispersion soln obtained is aluminium isopropoxide (AIP) alcoholic solution of 5%, stirs solvent evaporated, obtain coated product at the temperature of 60 DEG C;
By described coated product roasting 8h at 550 DEG C in air atmosphere, then with stove cooling, cross 400 eye mesh screens, obtain positive electrode.
According to the method described in technique scheme, the discharge capacity first of lithium ion battery prepared by the positive electrode that the test embodiment of the present invention 3 prepares and 45 DEG C of circulations, 300 capability retentions; Test result is, lithium ion battery prepared by the positive electrode that the embodiment of the present invention 3 prepares in 3V ~ 4.4V voltage range at 0.5mA/cm
2current density under carry out charge-discharge test, discharge capacity is 185.6mAh/g first, at 5mA/cm
2current density lower 45 DEG C circulation 300 capability retentions be 91.8%.
Embodiment 4
Li (Ni is prepared according to the method described in embodiment 1
0.8co
0.1mn
0.1) O
2granular materials and Li
1.02(Ni
0.5co
0.2mn
0.28al
0.02) O
2the material of mono-crystalline structures;
By the Li (Ni that the above-mentioned granularity D50 of 80g is 15 microns
0.8co
0.15al
0.05) O
2the granularity D50 of granular materials and 20g is the Li of 5 microns of mono-crystalline structures
1.02(Ni
0.5co
0.2mn
0.28al
0.02) O
2material mixes, and obtains base material;
Be evenly dispersed in the alcohol solvent of 100g by described base material, the mass fraction adding 1g in the dispersion soln obtained is aluminium isopropoxide (AIP) alcoholic solution of 5%, stirs solvent evaporated, obtain coated product at the temperature of 60 DEG C;
By described coated product roasting 8h at 550 DEG C in air atmosphere, then with stove cooling, cross 400 eye mesh screens, obtain positive electrode.
According to the method described in technique scheme, the discharge capacity first of lithium ion battery prepared by the positive electrode that the test embodiment of the present invention 4 prepares and 45 DEG C of circulations, 300 capability retentions; Test result is, lithium ion battery prepared by the positive electrode that the embodiment of the present invention 4 prepares in 3V ~ 4.4V voltage range at 0.5mA/cm
2current density under carry out charge-discharge test, discharge capacity is 182.3mAh/g first, at 5mA/cm
2current density lower 45 DEG C circulation 300 capability retentions be 88.3%.
Embodiment 5
Li (Ni is prepared according to the method described in embodiment 1
0.8co
0.1mn
0.1) O
2granular materials and Li
1.02(Ni
0.5co
0.2mn
0.28al
0.02) O
2the material of mono-crystalline structures;
By the Li (Ni that the above-mentioned granularity D50 of 60g is 15 microns
0.8co
0.15al
0.05) O
2the granularity D50 of granular materials and 40g is the Li of 5 microns of mono-crystalline structures
1.02(Ni
0.5co
0.2mn
0.28al
0.02) O
2material mixes, and obtains base material;
Be evenly dispersed in the alcohol solvent of 100g by described base material, the mass fraction adding 1g in the dispersion soln obtained is aluminium isopropoxide (AIP) alcoholic solution of 5%, stirs solvent evaporated, obtain coated product at the temperature of 60 DEG C;
By described coated product roasting 8h at 550 DEG C in air atmosphere, then with stove cooling, cross 400 eye mesh screens, obtain positive electrode.
According to the method described in technique scheme, the discharge capacity first of lithium ion battery prepared by the positive electrode that the test embodiment of the present invention 5 prepares and 45 DEG C of circulations, 300 capability retentions; Test result is, lithium ion battery prepared by the positive electrode that the embodiment of the present invention 5 prepares in 3V ~ 4.4V voltage range with 0.5mA/cm
2current density under carry out charge-discharge test, discharge capacity is 184.3.0mAh/g first, at 5mA/cm
2current density lower 45 DEG C circulation 300 capability retentions be 90.4%.
Embodiment 6
Li (Ni is prepared according to the method described in embodiment 1
0.8co
0.1mn
0.1) O
2granular materials and Li
1.02(Ni
0.5co
0.2mn
0.28al
0.02) O
2the material of mono-crystalline structures;
By the Li (Ni that the above-mentioned granularity D50 of 50g is 15 microns
0.8co
0.15al
0.05) O
2the granularity D50 of granular materials and 50g is the Li of 5 microns of mono-crystalline structures
1.02(Ni
0.5co
0.2mn
0.28al
0.02) O
2material mixes, and obtains base material;
Be evenly dispersed in the alcohol solvent of 100g by described base material, the mass fraction adding 1g in the dispersion soln obtained is aluminium isopropoxide (AIP) alcoholic solution of 5%, stirs solvent evaporated, obtain coated product at the temperature of 60 DEG C;
By described coated product roasting 8h at 550 DEG C in air atmosphere, then with stove cooling, cross 400 eye mesh screens, obtain positive electrode.
According to the method described in technique scheme, the discharge capacity first of lithium ion battery prepared by the positive electrode that the test embodiment of the present invention 6 prepares and 45 DEG C of circulations, 300 capability retentions; Test result is, lithium ion battery prepared by the positive electrode that the embodiment of the present invention 6 prepares in 3V ~ 4.4V voltage range at 0.5mA/cm
2current density under carry out charge-discharge test, discharge capacity is 187.6mAh/g first, at 5mA/cm
2current density lower 45 DEG C circulation 300 capability retentions be 93.4%.
Comparative example 1
Li (Ni is prepared according to the method described in embodiment 1
0.8co
0.1mn
0.1) O
2granular materials, using this granular materials as positive electrode.
According to the method described in technique scheme, test circulation 300 capability retentions at the discharge capacity first of lithium ion battery prepared by positive electrode that comparative example 1 of the present invention prepares and 45 DEG C; Test result is, lithium ion battery prepared by the positive electrode that comparative example 1 of the present invention prepares in 3V ~ 4.4V voltage range at 0.5mA/cm
2current density under carry out charge-discharge test, discharge capacity is 171.8mAh/g first, at 5mA/cm
2current density lower 45 DEG C circulation 300 capability retentions be 81.6%.
Comparative example 2
Preparing granularity D50 is by the following method 15 microns of Li (Ni
0.8co
0.15al
0.05) O
2particle positive electrode:
By Ni
0.8co
0.15al
0.05(OH)
2with lithium hydroxide (LiOHH2O) in molar ratio for the ratio of 1:1 mixes, obtain mixture;
By described mixture under the atmosphere of oxygen, be warming up to the speed of 3 DEG C/min the calcining that 830 DEG C are carried out 8h, obtain sintered product;
Described sintered product is sieved with fragmentation after the cooling of the cooling rate of 3 DEG C/min, obtains Li (Ni
0.8co
0.15al
0.05) O
2particle positive electrode.
According to the method described in technique scheme, test circulation 300 capability retentions at the discharge capacity first of lithium ion battery prepared by positive electrode that comparative example 2 of the present invention prepares and 45 DEG C; Test result is, lithium ion battery prepared by the positive electrode that comparative example 2 of the present invention prepares in 3V ~ 4.4V voltage range at 0.5mA/cm
2current density under carry out charge-discharge test, discharge capacity is 177.2mAh/g first, at 5mA/cm
2current density lower 45 DEG C circulation 300 capability retentions be 85.6%.
As seen from the above embodiment, the invention provides a kind of positive electrode, comprising: base material, described base material is prepared by the compound shown in the compound shown in formula I and formula II; Compound shown in formula I has the second particle pattern that multiple single crystal grain is reunited, and the compound shown in formula II has mono-crystalline structures; Be coated on the alumina layer of described substrate surface.In positive electrode provided by the invention, base material comprises the compound of granule-morphology and the compound of mono-crystalline structures, the compound of these two kinds of patterns is blended, the alkalinity on positive electrode surface provided by the invention can be reduced, make positive electrode have good capacity characteristic, its processing characteristics can also be improved; And substrate surface is coated with alumina layer in positive electrode provided by the invention, alumina layer coated can to avoid or reduce in battery moisture and HF to the erosion of positive pole material surface, and this positive electrode with alumina-coated layer can make the lithium ion battery prepared have higher operating voltage and thermal stability.
Claims (10)
1. a positive electrode, comprising:
Base material, described base material is prepared by the compound shown in the compound shown in formula I and formula II:
Li
(1+a1)ni
x1co
y1m
z1o
2formula I;
Li
(1+a2)ni
x2co
y2mn
z2m '
(1-x2-y2-z2)o
2formula II;
Wherein ,-0.1≤a1≤0.12,0.5 < x1 < 1, x1+y1+z1=1,
-0.1≤a2≤0.12，0＜x2≤0.5，0.98≤x2+y2+z2≤1；
M and M ' is independently selected from one or more in Cu, Zn, Mg, Al, Cd, Zr, Ti, Fe and Mo;
Compound shown in described formula I has the second particle pattern that multiple single crystal grain is reunited;
Compound shown in described formula II has mono-crystalline structures;
Be coated on the alumina layer of described substrate surface.
2. positive electrode according to claim 1, is characterized in that, the thickness of described alumina layer is 2 nanometer ~ 50 nanometers.
3. positive electrode according to claim 1, is characterized in that, the particle diameter of compound shown in described formula I is 12 microns ~ 20 microns.
4. positive electrode according to claim 1, is characterized in that, the average grain diameter of compound shown in described formula II is A, 0 < A≤6.5 micron.
5. positive electrode according to claim 1, is characterized in that, the mass ratio of the compound shown in the compound shown in described formula I and formula II is (30 ~ 85): (70 ~ 15).
6. a preparation method for the positive electrode in Claims 1 to 5 described in any one, comprising:
By the compound shown in the compound shown in formula I and formula II, obtain base material;
Li
(1+a1)ni
x1co
y1m
z1o
2formula I;
Li
(1+a2)ni
x2co
y2mn
z2m '
(1-x2-y2-z2)o
2formula II;
Wherein ,-0.1≤a1≤0.12,0.5 < x1 < 1, x1+y1+z1=1,
-0.1≤a2≤0.12，0＜x2≤0.5，0.98≤x2+y2+z2≤1；
M and M ' is independently selected from one or more in Cu, Zn, Mg, Al, Cd, Zr, Ti, Fe and Mo;
Compound shown in described formula I has the second particle pattern that multiple single crystal grain is reunited;
Compound shown in described formula II has mono-crystalline structures;
In a solvent, by solvent evaporated after described base material and the mixing of aluminium isopropoxide solution, coated product is obtained;
Described coated product is carried out roasting, obtains positive electrode.
7. method according to claim 6, is characterized in that, the temperature of described solvent evaporated is 40 DEG C ~ 80 DEG C.
8. method according to claim 6, is characterized in that, described solvent comprises one or more in alcohol compound, ether compound and ketone compounds.
9. method according to claim 6, is characterized in that, the temperature of described roasting is 400 DEG C ~ 700 DEG C.
10. a lithium ion battery, the positive electrode of described lithium ion battery is the positive electrode in Claims 1 to 5 described in any one, or the positive electrode that the method in claim 6 ~ 9 described in any one prepares.
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