CN112635749A - Carbon-coated high-nickel positive electrode material and preparation method and application thereof - Google Patents

Carbon-coated high-nickel positive electrode material and preparation method and application thereof Download PDF

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CN112635749A
CN112635749A CN202010486264.8A CN202010486264A CN112635749A CN 112635749 A CN112635749 A CN 112635749A CN 202010486264 A CN202010486264 A CN 202010486264A CN 112635749 A CN112635749 A CN 112635749A
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ltoreq
carbon
nickel
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陈跃
丁晓阳
吴志红
苗荣荣
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Fujian Shanshan Technology Co ltd
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Abstract

The invention discloses a carbon-coated high-nickel cathode material and a preparation method and application thereof. The carbon-coated high-nickel anode material comprises a substrate and a coating layer; wherein the matrix is a high-nickel anode material LiaNibCocMndAleO2(ii) a The coating layer is an amorphous carbon layer with no fixed partThe form carbon is coal tar and/or petroleum tar; the coating layer is coated on the surface of the substrate; the thickness of the coating layer is 5-60 nm. The raw material of the coating layer of the carbon-coated high-nickel cathode material is in a liquid state, can form pyrolytic amorphous carbon at a carbonization temperature, and is uniformly modified on the surface of a substrate; the coating layer can effectively isolate the direct contact of the electrolyte and the matrix, slow down the corrosion of the electrolyte to the matrix, inhibit the side reaction of the anode material and the electrolyte and improve the first efficiency and the cycle performance of the carbon-coated high-nickel anode material; the carbon-coated high-nickel cathode material has good safety, and the preparation method is simple and easy to implement.

Description

Carbon-coated high-nickel positive electrode material and preparation method and application thereof
Technical Field
The invention relates to a carbon-coated high-nickel cathode material and a preparation method and application thereof.
Background
With the reduction of non-renewable fossil energy and environmental issues, the development and utilization of new clean energy is receiving more and more attention. In the new energy automobile industry developing at a high speed, a power lithium battery is a key component. The lithium ion battery mainly comprises a positive electrode material, a negative electrode material, a diaphragm, electrolyte, a current collector and the like, wherein the performance of the positive electrode material directly influences the charge-discharge capacity, the cycle performance, the rate performance and the high-temperature thermal stability of the battery.
With the increasing requirement of power lithium batteries on energy density, the high-nickel ternary battery with the characteristics of high specific capacity, low cost, excellent safety and the like is considered to be the most widely applicable power battery anode material at present. However, the method has problems of low capacity retention rate, large irreversible phase, poor cycle performance, poor high-temperature thermal stability and the like, and the surface coating process is considered to be a method for simply and effectively improving multiple properties of the material. In order to realize industrialization of high-nickel materials with excellent comprehensive performance, physical property matching of the coating materials and research of a new coating process need to be enhanced urgently, and a good foundation is laid for meeting the requirements of the driving mileage and high safety of passenger vehicles.
Patent CN201910309813.1 discloses a high nickel cathode material with a uniform coating layer and a preparation method thereof, wherein the preparation method comprises the following steps: (1) adding an organic solvent and an acid compound containing phosphate radical into a container, and uniformly stirring to obtain a mixed solution a; (2) adding a high-nickel anode active material into the mixed solution a, and uniformly stirring to obtain a mixed solution b; (3) carrying out vacuum filtration or centrifugation on the mixed solution b, washing with absolute ethyl alcohol, carrying out suction drying, and drying in an oven to obtain a dried material; (4) and placing the dried material in a sagger, sintering at high temperature in a preheated muffle furnace oxygen atmosphere, cooling, crushing, and sieving to obtain the lithium phosphate coated high-nickel cathode material. The method has the disadvantages of long preparation flow, complex process, oxide particles formed on the surface of the material after the coating material is properly heated, and difficult industrialization.
Patent CN201910552189.8 proposes a treatment process for improving stability and conductivity of a high nickel cathode material, in which a high nickel cathode material obtained by sintering in an ozone atmosphere is respectively subjected to carbon dioxide annealing treatment and carbon dioxide plasma treatment. After sintering, carbon dioxide gas is continuously introduced to carry out annealing treatment, the carbon dioxide gas can react with lithium hydroxide remaining on the surface of the high-nickel anode material, the sensitivity of the material to air is reduced, the storage time of the material is prolonged, and finally carbon dioxide plasma treatment is carried out, so that a carbon layer is coated on the surface of the material, and the conductivity of the material is improved. The method can not realize high-efficiency uniform carbon coating on the particle surface, and the rate capability is not improved too much.
Disclosure of Invention
The invention aims to overcome the defects of low charge-discharge specific capacity, low first discharge efficiency and poor cycle performance caused by interface side reaction of the high-nickel anode material in the prior art, and provides the carbon-coated high-nickel anode material and the preparation method and application thereof. The carbon-coated high-nickel cathode material has the advantages of high charge-discharge specific capacity, high first discharge efficiency, high cycle retention rate, good safety and simple and feasible preparation method.
In order to achieve the purpose, the invention provides the following technical scheme:
one of the technical schemes provided by the invention is as follows: a carbon-coated high-nickel cathode material comprises a substrate and a coating layer;
the matrix is a high-nickel anode material LiaNibCocMndAleO2；
The coating layer is an amorphous carbon layer; the amorphous carbon in the amorphous carbon layer is coal tar and/or petroleum tar;
the coating layer is coated on the surface of the substrate; the thickness of the coating layer is 5-60 nm.
In the invention, the high-nickel cathode material LiaNibCocMndAleO2Of these, preferably, 0.97. ltoreq. a.ltoreq.1.07, 0.82. ltoreq. b.ltoreq.0.94, 0.02. ltoreq. c.ltoreq.0.15, 0. ltoreq. d.ltoreq.0.1, 0. ltoreq. e.ltoreq.0.08, for example Li1.00Ni0.83Co0.09Mn0.04Al0.04O2(ii) a More preferably, 0.98. ltoreq. a.ltoreq.1.04, 0.86. ltoreq. b.ltoreq.0.92, 0.05. ltoreq. c.ltoreq.0.12, 0.05. ltoreq. d.ltoreq.0.08, 0. ltoreq. e.ltoreq.0.05, for example Li1.00Ni0.88Co0.05Mn0.05Al0.02O2。
In the present invention, the thickness of the clad layer is preferably 20 nm. The structure of the coating layer can be a three-dimensional disordered graphite sheet structure.
The second technical scheme provided by the invention is as follows: a preparation method of a carbon-coated high-nickel cathode material comprises the following steps: mixing NibCocMndAleO2Carrying out wet coating and carbonization treatment on the precursor, amorphous carbon and a lithium source to obtain a carbon-coated high-nickel cathode material;
wherein said NibCocMndAleO2The mass ratio of the precursor to the amorphous carbon is 100: 3.5-100: 15.0;
the amorphous carbon is coal tar and/or petroleum tar.
In the present invention, the NibCocMndAleO2The mass ratio of the precursor to the amorphous carbon is preferably 100:7 to 100:13, and more preferably 100: 10.
The NibCocMndAleO2The mass ratio of the precursor to the lithium source can be 102: 100-103: 100, and is preferably 102: 100.
In the present invention, the NibCocMndAleO2The precursor is the precursor of the carbon-coated high-nickel cathode material. The NibCocMndAleO2In the precursor, preferably, 0.82. ltoreq. b.ltoreq.0.94, 0.02. ltoreq. c.ltoreq.0.15, 0. ltoreq. d.ltoreq.0.1, 0. ltoreq. e.ltoreq.0.08, for example Ni0.83Co0.09Mn0.04Al0.04O2(ii) a More preferably, 0.86. ltoreq. b.ltoreq.0.92, 0.05. ltoreq. c.ltoreq.0.12, 0.05. ltoreq. d.ltoreq.0.08, 0. ltoreq. e.ltoreq.0.05, for example Ni0.88Co0.05Mn0.05Al0.02O2。
The lithium source may be a lithium source conventional in the art, and is typically referred to as lithium hydroxide.
The coal tar can be conventional coal tar in the field, and is generally liquid coal tar; such as medium and low temperature coal tar or high temperature coal tar. The density of the coal tar can be the density of the coal tar conventional in the field, such as 1.00-1.17 g/cm3. The commercially available source of coal tar may be from cobers (Jiangsu) carbon chemical Co.
The petroleum tar may be a petroleum tar conventional in the art. The commercially available source of the petroleum tar can be Shandong Jingyang science and technology, Inc.
In the present invention, the wet coating method may be a wet coating method that is conventional in the art, and generally includes a dipping treatment, a surface adsorption extrusion treatment, and a surface rounding treatment. Preferably, no solvent is included in the wet coating process.
The time of the wet coating can be the conventional wet coating time in the field, and is preferably 5-60 min, such as 6-15 min, and more preferably 10 min.
The wet coating equipment can be conventional wet coating equipment in the field, and can be the equipment capable of coating the Ni in generalbCocMndAleO2Precursor, theA means for rounding the amorphous carbon and the lithium source; preferred are fusion machines, such as ZJ-6 fusion machines.
The rotating speed of the wet coating equipment can be the rotating speed of the conventional wet coating equipment in the field, and is preferably 250-1400 r/min, such as 300-500 r/min, and more preferably 400 r/min.
In the present invention, the carbonization treatment method may be a carbonization treatment method that is conventional in the art.
The temperature of the carbonization treatment may be a temperature conventional in the art, for example, heating to above 700 ℃, preferably 800 ℃.
The carbonization treatment time can be conventional carbonization treatment time in the field, such as 10-23 h, and preferably 20 h.
The atmosphere for the carbonization treatment may be an atmosphere for carbonization treatment which is conventional in the art, and is preferably an oxygen atmosphere.
The carbonization treatment equipment can be conventional carbonization treatment equipment in the field, and is preferably an atmosphere sintering furnace.
In the present invention, after the carbonization treatment, the method preferably includes the steps of removing part of residual lithium on the surface of the carbon-coated high nickel positive electrode material and reducing the moisture content in the carbon-coated high nickel positive electrode material.
The method for removing lithium remaining on the surface of the carbon-coated high-nickel cathode material can be a method conventional in the art. Preferably, the carbon-coated high-nickel cathode material is placed in salt-free water for treatment, so as to reduce the alkalinity of the surface of the carbon-coated high-nickel cathode material.
The temperature of the treatment can be 20-50 ℃, and preferably 30 ℃.
The treatment time can be 25-60 min, preferably 35 min.
The saltless water can be saltless water conventional in the art, and generally refers to water without calcium ions, magnesium ions and carbonate ions; such as distilled water.
The method for reducing the moisture content in the carbon-coated high-nickel cathode material can be a method conventional in the field, such as heat preservation.
The temperature of heat preservation can be 360-460 ℃, and is preferably 400 ℃.
The heat preservation time can be 5-8 h, preferably 6 h.
The heat-preserving equipment can be heat-preserving equipment conventional in the field, and is preferably an atmosphere sintering furnace.
The atmosphere for the incubation may be an incubation atmosphere conventional in the art, preferably an oxygen atmosphere.
The third technical scheme provided by the invention is as follows: the carbon-coated high-nickel cathode material prepared by the method.
In the invention, the carbon-coated high-nickel cathode material generally comprises a substrate and a coating layer.
In the present invention, the lithium source and the amorphous carbon may be coated on the Ni at the same timebCocMndAleO2The precursor surface. By the carbonization treatment, lithium ions are inserted into the layered NibCocMndAleO2The precursor forms a matrix, and the amorphous carbon forming coating is coated on the surface of the matrix.
Wherein the composition of the matrix is generally the same as the NibCocMndAleO2The composition of the precursor corresponds to that of the high-nickel anode material LiaNibCocMndAleO2. The high-nickel cathode material LiaNibCocMndAleO2As previously described.
Wherein the coating is preferably a uniform carbon coating. The thickness of the carbon coating layer can be 5-60 nm, and preferably 20 nm. The structure of the carbon coating layer can be a three-dimensional disordered graphite sheet structure.
In the invention, the carbonization treatment can uniformly cover the amorphous carbon on the surface of the substrate. Wherein, the amorphous carbon can improve the chemical stability, the cycle rate characteristic and the high-temperature thermal stability of the high-nickel cathode material.
The fourth technical scheme provided by the invention is as follows: an application of the carbon-coated high-nickel cathode material in a lithium ion battery.
The fifth technical scheme provided by the invention is as follows: a lithium ion battery comprising a carbon-coated high nickel positive electrode material as described above.
The preparation method of the lithium ion battery can be a conventional method in the field.
On the basis of the common knowledge in the field, the above preferred conditions can be combined randomly to obtain the preferred embodiments of the invention.
The reagents and starting materials used in the present invention are commercially available.
The positive progress effects of the invention are as follows:
(1) the raw material of the coating layer is liquid, can form pyrolytic amorphous carbon at the carbonization temperature, and is uniformly modified on the surface of the substrate;
(2) according to the carbon-coated high-nickel cathode material prepared by the invention, the carbon coating layer deposited on the surface is of a three-dimensional disordered graphite lamellar structure, and a large lithium insertion space and lithium ion transmission channels and paths in all directions can be provided, so that the three-dimensional lithium ion insertion channel is improved, and the dynamic process of lithium ions on the interface is obviously improved;
(3) the coating layer can effectively isolate the direct contact of the electrolyte and the matrix, slow down the corrosion of the electrolyte to the matrix, inhibit the side reaction of the anode material and the electrolyte and improve the first efficiency and the cycle performance of the carbon-coated high-nickel anode material;
(4) according to the invention, a stable SEI film is formed on the surface of the carbon-coated high-nickel anode material, so that the coating layer has high chemical stability, and the safety performance of the material can be improved;
(5) the preparation raw materials are easy to obtain, and the preparation method is simple.
Drawings
Fig. 1 shows specific discharge capacities of carbon-coated high nickel positive electrode materials prepared in examples 1 to 6 and comparative examples 1 to 4 at different rates.
Detailed Description
The invention is further illustrated by the following examples, which are not intended to limit the scope of the invention. The experimental methods without specifying specific conditions in the following examples were selected according to the conventional methods and conditions, or according to the commercial instructions.
The ZJ-6 fusion machine described in the following examples and comparative examples is a commercially available product having a volume of 2.0m3。
The commercial source of coal tar in the following examples and comparative examples is Cobeus (Jiangsu) carbon chemical Co., Ltd; the commercially available source of petroleum tar is Shandong Jingyang science and technology, Inc.
Example 1
And (2) mixing the components in a mass ratio of 102: 100:10 lithium hydroxide monohydrate, Ni0.83Co0.09Mn0.04Al0.04O2Carrying out wet coating on the precursor and the coal tar in a ZJ-6 fusion machine, wherein no solvent is involved in the coating process, the wet coating time is 10min, and the rotating speed is 400 r/min; wherein, the inner wall of the ZJ-6 fusion machine is provided with a blade scraper, and Ni can be scraped by coal tar through a mechanical method0.83Co0.09Mn0.04Al0.04O2Performing liquid phase mixing and coating on the precursor and the lithium hydroxide monohydrate, and performing impregnation treatment, adsorption extrusion treatment and rounding treatment on the precursor and the lithium hydroxide monohydrate to achieve the effects of surface micro-shaping and modification and coating, thereby obtaining a uniform mixed material;
placing the uniformly mixed material in an atmosphere sintering furnace, heating to 800 ℃ in an oxygen atmosphere, sintering for 20h, and uniformly pyrolyzing and depositing coal tar on the surface of the high-nickel anode material to obtain a calcined material, wherein the calcined material is the carbon-coated high-nickel anode material;
and (3) treating the calcined material in 30 ℃ saline-free water for 35min to remove partial residual lithium on the surface of the material, drying, placing in an atmosphere sintering furnace, heating to 400 ℃ in an oxygen atmosphere, and keeping the temperature for 6h to obtain the carbon-coated high-nickel cathode material with partial residual lithium on the surface removed and the water content reduced.
Example 2
In example 2, lithium hydroxide monohydrate, Ni0.83Co0.09Mn0.04Al0.04O2The mass ratio of the precursor to the coal tar is 102: 100: 4.5, the rest is the same as example 1.
Example 3
The amorphous carbon in example 3 was petroleum tar, in which lithium hydroxide monohydrate, Ni0.83Co0.09Mn0.04Al0.04O2The mass ratio of the precursor to the petroleum tar is 102: 100: 7.5, the rest is the same as example 1.
Example 4
The amorphous carbon in example 4 was petroleum tar, in which lithium hydroxide monohydrate, Ni0.83Co0.09Mn0.04Al0.04O2The mass ratio of the precursor to the petroleum tar is 102: 100: 12.5, otherwise as in example 1.
Example 5
The precursor in example 5 is Ni0.88Co0.05Mn0.05Al0.02O2Otherwise, the same procedure as in example 1 was repeated.
Example 6
The temperature of the carbonization treatment in example 6 was 700 ℃ and the same procedure as in example 1 was repeated.
Comparative example 1
Comparative example 1 in which amorphous carbon was not added, lithium hydroxide monohydrate and Ni0.83Co0.09Mn0.04Al0.04O2The mass ratio of the precursors is 102:100, the rest is the same as example 1.
Comparative example 2
Comparative example 2, lithium hydroxide monohydrate, Ni0.83Co0.09Mn0.04Al0.04O2The mass ratio of the precursor to the coal tar is 102: 100:1, the rest is the same as example 1.
Comparative example 3
In comparative example 3, lithium hydroxide monohydrate, Ni0.83Co0.09Mn0.04Al0.04O2The mass ratio of the precursor to the coal tar is 102: 100: 18, the rest were the same as in example 1.
Comparative example 4
In comparative example 4, coal tar was replaced with polyvinyl alcohol (PVA) as a raw material for the carbon coating layer, and the other examples were the same as example 2.
Effect example 1
The carbon-coated high-nickel positive electrode materials prepared in examples 1 to 6 and comparative examples 1 to 4 were tested for specific discharge capacity, primary efficiency, and cycle performance by a half-cell test method.
The method for detecting the electrochemical performance specifically comprises the following steps: mixing the active substance: conductive carbon black (SP): and mixing the PVDF binder at a ratio of 92:4:4 to prepare anode slurry, coating the anode slurry on an aluminum foil, rolling and tabletting. A lithium plate as a negative electrode, a polypropylene diaphragm and 1M LiPF electrolyte6The solvent of the solution is 1: 1: 1 of Ethylene Carbonate (EC), dimethyl carbonate (DMC) and methyl ethyl carbonate (EMC). In a vacuum glove box protected by argon, a CR2032 button cell is assembled and assembled for detection according to the sequence of a positive electrode battery case, a positive electrode pole piece, a diaphragm, electrolyte, a lithium piece, foam nickel and a negative electrode battery case. The temperature was 25 ℃ and 1C was calculated as 200 mAh/g. Constant current charging and discharging and multiplying power performance tests are carried out on an ArbinBT2000 type battery tester in the United states, and the charging and discharging voltage range is 3.0-4.3V. The cycle test was carried out using 0.5C charging and discharging.
The DSC test used an assembled battery, charged to 4.3V, disassembled in a glove box, and the positive electrode material was placed in a crucible and sealed. The test adopts a temperature rise speed of 10 ℃/min, the temperature rises to 450 ℃, and the temperature corresponding to the first peak value is recorded.
The carbon-coated high nickel positive electrode materials prepared in the above examples 1 to 6 and comparative examples 2 to 4 each include a substrate and a coating layer.
In examples 1 to 4, 6 and comparative examples 2 to 3, the matrix of the carbon-coated high-nickel positive electrode material was Li, which is a high-nickel positive electrode material1.00Ni0.83Co0.09Mn0.04Al0.04O2(ii) a The coating layer is coal tar or petroleum tar, and the structure of the coating layer is a three-dimensional disordered graphite sheet structure.
In example 5, the matrix of the carbon-coated high-nickel positive electrode material was Li, a high-nickel positive electrode material1.00Ni0.88Co0.05Mn0.0 5Al0.02O2(ii) a The coating layer is coal tar, and the structure of coating layer is three-dimensional unordered graphite lamellar structure.
In comparative example 4, the matrix of the carbon-coated high-nickel positive electrode material was high-nickel positive electrode material Li1.00Ni0.83Co0.09Mn0.0 4Al0.04O2(ii) a The coating layer is polyvinyl alcohol (PVA).
And testing the thickness of the coating layer on the surface of the carbon-coated high-nickel anode material by adopting a JEM-2100F field emission transmission electron microscope.
The results are given in table 1 below.
TABLE 1
Figure BDA0002519208580000101
Compared with comparative examples 1 to 4, the carbon-coated high-nickel positive electrode materials in examples 1 to 6 have higher specific discharge capacity and first efficiency, and the 50-cycle retention rate performance is improved to a greater extent. From the perspective of thermal peak, the first exothermic peak temperature of the DSC in examples 1-6 is higher than that of comparative examples 1-4, and the DSC has better safety on the basis of higher specific discharge capacity, first efficiency and cycle retention rate.
As can be seen from fig. 1, the discharge retention rates of the batteries prepared from the carbon-coated high-nickel cathode materials in examples 1 to 2 at different multiplying powers are obviously better than those of the batteries prepared in comparative examples 1 to 4; the reason for this is that the matrix (high nickel positive electrode material Li) is subjected to the preparation method of the present inventionaNibCocMndAleO2) The surface of the lithium ion battery is subjected to uniform carbon modification, so that the transmission rate of lithium ions can be improved; furthermore, according to the discharge specific capacity data of comparative examples 1 to 4, compared with the case that the substrate surface has no coating layer, the coating layer dosage is too low or too high, or the raw material of the carbon coating layer is organic, the high-nickel anode material with the uniform carbon coating layer attached on the surface has obviously improved high-rate discharge performance, which indicates that the surface carbon coating type structure is more beneficial to high-rate discharge.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.

Claims (10)

1. A carbon-coated high-nickel cathode material is characterized by comprising a substrate and a coating layer;
the matrix is a high-nickel anode material LiaNibCocMndAleO2；
The coating layer is an amorphous carbon layer; the amorphous carbon in the amorphous carbon layer is coal tar and/or petroleum tar;
the coating layer is coated on the surface of the substrate; the thickness of the coating layer is 5-60 nm.
2. The carbon-coated high nickel positive electrode material according to claim 1, wherein the high nickel positive electrode material LiaNibCocMndAleO2In the case of 0.97. ltoreq. a.ltoreq.1.07, 0.82. ltoreq. b.ltoreq.0.94, 0.02. ltoreq. c.ltoreq.0.15, 0. ltoreq. d.ltoreq.0.1, 0. ltoreq. e.ltoreq.0.08, for example Li1.00Ni0.83Co0.09Mn0.04Al0.04O2(ii) a Preferably, 0.98. ltoreq. a.ltoreq.1.04, 0.86. ltoreq. b.ltoreq.0.92, 0.05. ltoreq. c.ltoreq.0.12, 0.05. ltoreq. d.ltoreq.0.08, 0. ltoreq. e.ltoreq.0.05, for example Li1.00Ni0.88Co0.05Mn0.05Al0.02O2；
And/or the thickness of the coating layer is 20 nm.
3. A preparation method of a carbon-coated high-nickel cathode material is characterized by comprising the following steps: mixing NibCocMndAleO2Carrying out wet coating and carbonization treatment on the precursor, amorphous carbon and a lithium source to obtain a carbon-coated high-nickel cathode material;
wherein, theNi as described abovebCocMndAleO2The mass ratio of the precursor to the amorphous carbon is 100: 3.5-100: 15.0;
the amorphous carbon is coal tar and/or petroleum tar.
4. The method of claim 3, wherein the Ni isbCocMndAleO2The mass ratio of the precursor to the amorphous carbon is 100: 7-100: 13, preferably 100: 10;
and/or, the NibCocMndAleO2The mass ratio of the precursor to the lithium source is 102: 100-103: 100, preferably 102: 100;
and/or, the NibCocMndAleO2In the precursor, 0.82. ltoreq. b.ltoreq.0.94, 0.02. ltoreq. c.ltoreq.0.15, 0. ltoreq. d.ltoreq.0.1, 0. ltoreq. e.ltoreq.0.08, for example Ni0.83Co0.09Mn0.04Al0.04O2(ii) a Preferably, 0.86. ltoreq. b.ltoreq.0.92, 0.05. ltoreq. c.ltoreq.0.12, 0.05. ltoreq. d.ltoreq.0.08, 0. ltoreq. e.ltoreq.0.05, for example Ni0.88Co0.05Mn0.05Al0.02O2；
And/or, the lithium source is lithium hydroxide;
and/or the coal tar is liquid coal tar; the density of the coal tar is preferably 1.00-1.17 g/cm3。
5. The production method according to claim 3 or 4, wherein a solvent is not included in the wet coating process;
and/or the time of the wet coating is 5-60 min, such as 6-15 min, preferably 10 min;
and/or, the wet-coated device is a fusion machine, such as a ZJ-6 fusion machine;
and/or the rotating speed of the wet coating equipment is 250-1400 r/min, such as 300-500 r/min, preferably 400 r/min.
6. The method according to claim 3 or 4, wherein the carbonization treatment is performed at a temperature of 700 ℃ or higher, preferably 800 ℃;
and/or the carbonization treatment time is 10-23 h, preferably 20 h;
and/or the atmosphere of the carbonization treatment is an oxygen atmosphere;
and/or the carbonization treatment equipment is an atmosphere sintering furnace.
7. The preparation method according to claim 3 or 4, characterized by comprising the steps of removing part of residual lithium on the surface of the carbon-coated high-nickel positive electrode material and reducing the moisture content in the carbon-coated high-nickel positive electrode material after the carbonization treatment;
preferably, the method for removing partial residual lithium on the surface of the carbon-coated high-nickel cathode material is to place the carbon-coated high-nickel cathode material in salt-free water for treatment;
the treatment temperature is preferably 20-50 ℃, and more preferably 30 ℃;
the treatment time is preferably 25-60 min, and more preferably 35 min;
preferably, the method for reducing the moisture content in the carbon-coated high-nickel cathode material is heat preservation;
the temperature of the heat preservation is preferably 360-460 ℃, and more preferably 400 ℃;
the heat preservation time is preferably 5-8 h, and more preferably 6 h;
the heat-preserving equipment is preferably an atmosphere sintering furnace;
the atmosphere for the heat preservation is preferably an oxygen atmosphere.
8. A carbon-coated high-nickel positive electrode material, which is characterized by being prepared by the preparation method of any one of claims 3 to 7;
preferably, the carbon-coated high-nickel cathode material comprises a substrate and a coating layer;
preferably, the matrix is a high-nickel cathode material LiaNibCocMndAleO2；
Preferably, the coating is a uniform carbon coating; the thickness of the carbon coating layer is preferably 5-60 nm, and more preferably 20 nm.
9. Use of the carbon-coated high nickel positive electrode material according to claim 1 or 8 in a lithium ion battery.
10. A lithium ion battery, characterized in that the lithium ion battery comprises the carbon-coated high nickel positive electrode material according to claim 1 or 8.
CN202010486264.8A 2020-06-01 2020-06-01 Carbon-coated high-nickel positive electrode material and preparation method and application thereof Pending CN112635749A (en)

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