CN115504523A - Aluminum oxide coated NCM positive electrode material and preparation method and application thereof - Google Patents

Aluminum oxide coated NCM positive electrode material and preparation method and application thereof Download PDF

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CN115504523A
CN115504523A CN202211274222.3A CN202211274222A CN115504523A CN 115504523 A CN115504523 A CN 115504523A CN 202211274222 A CN202211274222 A CN 202211274222A CN 115504523 A CN115504523 A CN 115504523A
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赖燊
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Yangjiang Zhipan Technology Co ltd
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Abstract

The invention discloses an aluminum oxide coated NCM (negative polarity management) cathode material as well as a preparation method and application thereof, wherein the preparation method of the aluminum oxide coated NCM cathode material comprises the following steps: s10, precursor material preparation: mixing a liquid phase of the NCM anode material with a solvent containing aluminum nitrate, uniformly stirring, and then carrying out vacuum drying to obtain a precursor material; s20, calcining: and (3) putting the precursor material into oxygen-containing gas for calcination, and grinding the calcined black product into powder to obtain the catalyst. The aluminum oxide coated NCM cathode material provided by the invention has an aluminum oxide coating layer with complete, uniform, compact and nano-thickness and stable interface chemical bonds, can effectively inhibit surface dissolution of the cathode material, improves the interface structure stability of the cathode material, prevents electrode materials from being corroded by electrolyte and the like, shows excellent electrochemical activity, and can obtain a lithium battery device with high cycle stability.

Description

Aluminum oxide coated NCM positive electrode material and preparation method and application thereof
Technical Field
The invention relates to the technical field of lithium batteries, in particular to an aluminum oxide coated NCM positive electrode material and a preparation method and application thereof.
Background
With the rapid development of the world's economy, energy and environment have become important factors that plague economic growth. In recent years, the demand of a large number of electronic products and new energy automobiles on batteries is increasing day by day, and lithium ion batteries are widely concerned by the characteristics of greenness, no pollution, long cycle life, high energy density, no memory effect and the like. The performance of the lithium ion battery anode material is one of the key problems which restrict the development and application of the lithium ion battery. The nickel-based positive electrode material has the characteristics of high specific discharge capacity, low cost, environmental friendliness and the like, and is widely concerned by researchers. The high nickel layered anode has extremely high energy density and is an anode material mainly used for large energy storage systems such as electric automobiles and the like at present. When high nickel positive electrodes increase the charging voltage (> 4.5V) the capacity increases, which means that they can provide more energy than when charged to low voltages. However, high pressure cycling can lead to a number of problems. For example, the transition metal in the positive electrode lattice may dissolve into the electrolyte and deposit on the negative electrode; the surface of the positive electrode may undergo phase transition and convert to a poorly conducting phase, and cracks may form in the particles, hindering electron and ion transport, thereby destroying the integrity of the surface and bulk phases of the positive electrode, and hindering the cycling stability of the battery under high voltage. These problems must be solved simultaneously before stable high voltage cycling is achieved, but obtaining stable cycling of a high nickel layered cathode at ultra high voltages (> 4.5V) remains very challenging.
In recent years, the market share of ternary positive electrode materials in the field of electric vehicles has been rising year by year, mainly due to the higher specific energy and the relatively low price of ternary positive electrode materials, which meets the urgent need of long endurance for drivers. However, the internal electrochemical reaction of the ternary cathode material at high voltage is not ideal, mainly because the ternary cathode material is dissolved at high voltage. Doping or surface coating are necessary schemes for modifying the high-voltage anode material. Therefore, the surface of the ternary cathode material is coated, and an effective compounding method is provided. Alumina (Al 2O 3), which is an inactive oxide, can trap HF ions when inside the electrolyte, thereby inhibiting dissolution of the ternary positive electrode material, and has an excellent coating effect. In view of this, it is necessary to provide a novel method for preparing an aluminum oxide-coated NCM positive electrode material.
At present, the decomposition of electrolyte can be caused by the charge and discharge of a high-nickel anode material under high voltage, elements such as nickel, cobalt, manganese and the like can be dissolved out from an anode, so that the performance of the anode material is poor, and the performance is poor in circulation and high-temperature performance, and in order to improve the performance of the high-nickel anode material, the following ways are generally adopted to solve the problems (1) a high-voltage resistant electrolyte system is developed; and (2) coating the surface of the high-nickel front-view material. Under higher charge and discharge voltage, the surface of the high-nickel anode material is coated with a stable protective layer, so that the direct contact between an electrode and electrolyte can be avoided or slowed down, the decomposition of the electrolyte and the dissolution of elements such as nickel, cobalt, manganese and the like are reduced, the chemical stability of the material is effectively improved, and substances usually used as the protective layer comprise metal oxides, phosphates, metals and the like. In view of the development of the prior art, the research on the coating of the lithium battery cathode material is more and more extensive, but the defects of more or less uneven coating, loose coating, complex coating process, long period and high cost exist.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide an aluminum oxide coated NCM cathode material, and a preparation method and application thereof.
One of the purposes of the invention is realized by adopting the following technical scheme:
the preparation method of the aluminum oxide coated NCM positive electrode material is characterized by comprising the following steps:
s10, precursor material preparation: mixing a liquid phase of an NCM positive electrode material with a solvent containing aluminum nitrate, uniformly stirring, and then carrying out vacuum drying to obtain a precursor material;
s20, calcining: and (3) putting the precursor material into oxygen-containing gas for calcining, and grinding the calcined black product into powder to obtain the material.
In the present invention, as a preferred embodiment, in step S10, the NCM positive electrode material is an NCM811 type ternary material.
In the present invention, as a preferred example, in step S10, the molar ratio of aluminum in the aluminum nitrate-containing solvent to the NCM positive electrode material is 1.
In the present invention, as a preferred embodiment, in step S10, the mass ratio of the solvent containing aluminum nitrate to the NCM positive electrode material is 1.
In the present invention, as a preferred embodiment, in step S10, the solvent is an alcohol solvent, and preferably, the solvent is ethanol.
In the present invention, as a preferred embodiment, in step S20, the oxygen-containing gas is a mixed gas of oxygen and nitrogen, wherein the volume percentage of oxygen is 85% to 100%.
In the present invention, as a preferred embodiment, in step S20, the calcination conditions are: heating to 700-720 ℃ at the heating rate of 3-7 ℃/min, and preserving heat for 2-3h.
The second purpose of the invention is realized by adopting the following technical scheme:
an alumina-coated NCM positive electrode material is characterized by being obtained by the preparation method which is one of the purposes of the invention.
The third purpose of the invention is realized by adopting the following technical scheme:
the aluminum oxide coated NCM cathode material which is one of the purposes of the invention is applied to the preparation of lithium ion batteries.
In the present invention, as a preferred embodiment, a method for manufacturing a lithium ion battery includes: coating an aluminum oxide on an NCM positive electrode material, conductive carbon black and PVDF according to the mass ratio of 8:1:1 or 96:2:2, proportioning, placing the mixture into NMP, stirring the mixture to be uniform slurry, coating the slurry on a current collector aluminum foil, blowing and drying the moisture in a drying box at 80 ℃ for 6 hours, and uniformly cutting the aluminum foil loaded with the electrode active material into wafers with the diameter of 14 mm; and in a glove box filled with high-purity argon, adding lithium metal as a counter electrode, adding lithium battery electrolyte and a diaphragm, and assembling the CR2032 type button cell.
Compared with the prior art, the invention has the beneficial effects that: the invention overcomes the defects of nonuniform and thick aluminum oxide coating, surface activity damage caused by introduction of acid medium and water, unstable interface structure and the like of the aluminum oxide coated ternary anode material prepared by the conventional hydrolysis precipitation method, overcomes the defects of high equipment cost and difficulty in industrial production of the conventional atomic deposition method, and has higher electrochemical activity and cycling stability compared with the conventional similar material. The aluminum oxide coated NCM cathode material provided by the invention has an aluminum oxide coating layer with complete, uniform, compact and nanometer thickness and stable interface chemical bonds, can effectively inhibit surface dissolution of the cathode material, improves the interface structure stability of the cathode material, prevents electrode materials from being corroded by electrolyte and the like, shows excellent electrochemical activity, and can obtain a lithium battery device with high cycle stability.
Drawings
FIGS. 1 and 2 are scanning electron microscope images of the alumina-coated NCM positive electrode material obtained in example 1, at respective magnifications of 50000 and 20000;
FIG. 3 is a graph of long cycle performance and coulombic efficiency under 3V-4.3V and 0.33C current charge and discharge conditions for the alumina-coated NCM positive electrode material prepared in example 1;
FIG. 4 is a graph of the first 4 cycles of cyclic voltammetry performance at a voltage of 3.0V to 4.5V and a sweep rate of 0.1mV for the alumina-coated NCM positive electrode material prepared in example 1;
FIG. 5 is an XRD pattern of the alumina-coated NCM positive electrode material prepared in example 1;
fig. 6 is a graph of cycle performance under high voltage of 3V to 4.5V and current of 0.33C for the alumina-coated NCM positive electrode materials prepared in example 1, example 2, comparative example 1, and comparative example 2.
Detailed description of the preferred embodiment
The present invention is further described below with reference to specific embodiments, and it should be noted that, without conflict, any combination between the embodiments or technical features described below may form a new embodiment. Except as specifically noted, the materials and equipment used in this example are commercially available.
One of the purposes of the invention is realized by adopting the following technical scheme:
the preparation method of the aluminum oxide coated NCM positive electrode material is characterized by comprising the following steps:
s10, precursor material preparation: mixing a liquid phase of an NCM positive electrode material with a solvent containing aluminum nitrate, uniformly stirring, and then carrying out vacuum drying to obtain a precursor material;
s20, calcining: and (3) putting the precursor material into oxygen-containing gas for calcining, and grinding the calcined black product into powder to obtain the material.
In a preferred embodiment, in step S10, the NCM positive electrode material is an NCM811 type ternary material. The NCM811 type ternary material particle surface shows stronger adsorption performance, in the liquid phase mixing process, the ethanol solution containing aluminum nitrate can form a layer of aluminum-containing organic layer which is closely attached on the surface of the powder material in an adsorption way, and the ethanol solution and the trace carboxyl (LiOH) or hydroxyl (COO-) and the like which are adsorbed on the NCM811 type ternary material surface are subjected to chemical action, so that a close and uniform aluminum-containing organic coating layer can be formed on the NCM811 type ternary material surface through chemical bonding, and a uniform and complete aluminum oxide coating layer can be further formed on the NCM811 type ternary material surface through pyrolysis.
In a preferred embodiment, in step S10, the molar ratio of aluminum in the aluminum nitrate-containing solvent to the NCM positive electrode material is 1. The thickness of the aluminum oxide can be adjusted within the range of 2nm-10nm by adjusting the mass ratio of aluminum in the aluminum nitrate-containing solvent to the NCM positive electrode material; as a more preferable scheme, the mass ratio of the solvent containing aluminum nitrate to the NCM positive electrode material is 1.
In a preferred embodiment, in step S10, the solvent is an alcohol solvent. Preferably, the solvent is ethanol.
In a preferred embodiment, in step S20, the oxygen-containing gas is a mixed gas of oxygen and nitrogen, wherein the volume percentage of oxygen is 85% to 100%. The control of the atmosphere is one of the key steps, and the alumina nano particles are gradually agglomerated into spherical micro particles due to the large surface energy, so that the alumina coating layer is difficult to form effectively.
In a preferred embodiment, in step S20, the calcination conditions are: heating to 700-720 ℃ at the heating rate of 3-7 ℃/min, and preserving heat for 2-3h. The heating rate is preferably 3-5 deg.C/min, and the selection of the calcining condition is crucial to the formation of the alumina coating layer. When the calcining temperature is too high and the calcining time is too long, the influence on the crystal structure of the Ni-Co-Mn ternary lithium battery positive electrode material is generated, the electrochemical activity of the bulk material is damaged, and the electrochemical performance of the material is reduced.
An alumina-coated NCM cathode material, which is obtained by the preparation method of one of the objects of the invention.
The aluminum oxide coated NCM cathode material is applied to the preparation of lithium ion batteries.
As a preferred embodiment, a method of manufacturing a lithium ion battery includes: coating an aluminum oxide on an NCM positive electrode material, conductive carbon black and PVDF according to the mass ratio of 8:1:1 or 96:2:2, proportioning, placing the mixture in NMP (N-methyl pyrrolidone) to be stirred into a uniform slurry, coating the slurry on a current collector aluminum foil, placing the dried mixture in a drying box after the contained water is blown dry, drying the dried mixture for 6 hours at the temperature of 80 ℃, and then uniformly cutting the aluminum foil loaded with the electrode active material into a wafer with the diameter of 14 mm; and in a glove box filled with high-purity argon, adding lithium metal serving as a counter electrode into the glove box, adding lithium battery electrolyte and a diaphragm, and assembling the CR2032 button cell.
In order to better understand the present invention, the following examples are further provided to illustrate the content of the present invention, but the present invention is not limited to the following examples.
Example 1
The preparation method of the aluminum oxide coated NCM cathode material comprises the following steps:
s10, precursor material preparation: dissolving 1-2g of aluminum nitrate in 100ml of absolute ethyl alcohol, magnetically stirring for 1h to obtain a clear solution, adding 10g of NCM811 type ternary material into the solution, stirring for 2h, distilling the material under reduced pressure to remove the ethanol, and vacuum-drying the obtained material for 6h to obtain the final dried precursor material.
S20, calcining: calcining the precursor material in oxygen-containing gas, wherein the oxygen-containing gas is mixed gas of oxygen and nitrogen, and the volume percentage of the oxygen is 90%; the calcining conditions are as follows: calcining for 2h at 700 ℃, heating up at the rate of 5 ℃/min, and naturally cooling. And grinding the calcined black product into powder to obtain the aluminum oxide coated NCM cathode material.
Referring to fig. 1 and 2, in order to obtain the surface coating sem images of the prepared alumina-coated NCM cathode material, it can be seen that the alumina coating layer has a uniform thickness and is dense.
FIG. 3 is a cycle chart of the alumina-coated NCM positive electrode material prepared in example 1 after 100 cycles under the conditions of 3V to 4.3V voltage and 0.33C current density charge and discharge; it can be seen from the figure that the long-cycle capacity of the NCM containing the alumina coating layer is stable after the first cycle, no significant attenuation is seen in the first 100 cycles, and the capacity retention rate exceeds 90%.
FIG. 4 is a plot of the first 4 cycles of cyclic voltammetry performance at a voltage of 3.0V to 4.5V and a scan rate of 0.1mV for the alumina-coated NCM positive electrode material prepared in example 1; it can be seen from the figure that the NCM cyclic voltammogram containing the alumina coating started to become very stable after the first cycle and the potential peak point did not change significantly.
FIG. 5 is an XRD pattern of the alumina-coated NCM positive electrode material prepared in example 1; it can be seen from the figure that the crystal structure of the NCM containing the alumina coating was not destroyed and the alumina coating had no significant effect on the crystal structure of the NCM.
Coating an aluminum oxide on an NCM positive electrode material, conductive carbon black and PVDF according to a mass ratio of 8:1:1, proportioning, placing in NMP, stirring to be uniform slurry, coating on a current collector aluminum foil, blowing and drying the moisture contained in the current collector aluminum foil for 6 hours at 80 ℃, and uniformly cutting the aluminum foil loaded with the electrode active material into a wafer with the diameter of 14 mm. In a glove box filled with high-purity argon, metal lithium is used as a counter electrode, and a 1M LiPF6 EC-EMC (1) conventional electrolyte and a diaphragm are added for assembling a CR2032 type button cell.
The performance of the lithium ion battery was examined. As shown in fig. 3, under the charging and discharging conditions of 3V to 4.3V and the current density of 0.33C, the first charge coulombic efficiency exceeds 85%, and after 100 cycles of cycle, the lithium capacity of the material is kept to 174mAh/g. The relatively high capacity residue indicates that the prepared ternary material @ alumina composite material has excellent electrochemical performance. As shown in fig. 6, the lithium capacity of the material was maintained at 162mAh/g after 100 cycles under the high voltage of 3V to 4.5V and the current density of 0.33C under the charge-discharge conditions. The relatively high capacity retention rate indicates that the prepared ternary material @ alumina composite material has excellent electrochemical performance.
Example 2
The preparation method of the aluminum oxide coated NCM cathode material comprises the following steps:
s10, precursor material preparation: dissolving 1-2g of aluminum nitrate in 100ml of absolute ethyl alcohol, magnetically stirring for 1h to obtain a clear solution, adding 10g of NCM811 type ternary material into the solution, stirring for 2h, distilling the material under reduced pressure to remove the ethanol, and vacuum-drying the obtained material for 6h to obtain the final dried precursor material.
S20, calcining: calcining the precursor material in oxygen-containing gas, wherein the oxygen-containing gas is mixed gas of oxygen and nitrogen, and the volume percentage of the oxygen is pure oxygen atmosphere; the calcination conditions were: calcining for 2h at 700 ℃, heating up at the rate of 5 ℃/min, and naturally cooling. And grinding the calcined black product into powder to obtain the aluminum oxide coated NCM cathode material.
Coating an NCM anode material with alumina, conductive carbon black and PVDF according to a mass ratio of 96:2:2, proportioning, placing in NMP, stirring to be uniform slurry, coating on a current collector aluminum foil, drying in a drying box at 80 ℃ for 6 hours after the contained moisture is blown dry, then uniformly cutting the aluminum foil loaded with the electrode active material into a circular sheet with the diameter of 13mm, and coating commercial graphite on the copper foil with the N/P ratio of 1.1. In a glove box filled with high-purity argon, graphite was used as a counter electrode, and a 1M lipff 6 EC-EMC (1) conventional electrolyte and a separator were added to perform CR2032 type button cell assembly.
The performance of the prepared lithium ion full cell was examined. As shown in fig. 6, under the conditions of high voltage of 3V to 4.5V and current density of 0.33C, after 100 cycles of cycle, the lithium capacity of the material is maintained at 158mAh/g, and excellent performance can be obtained in the full battery environment.
Comparative example 1:
the preparation method of the aluminum oxide coated NCM cathode material comprises the following steps:
s10, precursor material preparation: 1-2g of aluminum nitrate is dissolved in 100ml of absolute ethyl alcohol, 1h of magnetic stirring is carried out to obtain a clear solution, 10g of NCM811 type ternary material is added into the solution, 2h of stirring is carried out to remove the ethyl alcohol through reduced pressure distillation, and the obtained material is dried in vacuum for 6h to obtain the final dry precursor material.
S20, calcining: calcining the precursor material in oxygen-containing gas, wherein the oxygen-containing gas is mixed gas of oxygen and nitrogen, and the volume percentage of the oxygen is 90%; the calcining conditions are as follows: calcining for 2h at 900 ℃, heating up at the rate of 5 ℃/min, and naturally cooling. And grinding the calcined black product into powder to obtain the aluminum oxide coated NCM cathode material.
The alumina on the surface of the test material is in granular aggregation, and obvious gaps exist among granules.
And (2) coating the obtained aluminum oxide coated NCM cathode material, conductive carbon black and PVDF according to the mass ratio of 8:1:1, proportioning, placing in NMP, stirring to be uniform slurry, coating on a current collector aluminum foil, blowing and drying the moisture contained in the current collector aluminum foil for 6 hours at 80 ℃, and uniformly cutting the aluminum foil loaded with the electrode active material into a wafer with the diameter of 14 mm. In a glove box filled with high-purity argon, metal lithium was used as a counter electrode, and a 1m lipff 6 EC-EMC (1) conventional electrolyte and a separator were added to perform CR2032 type button cell assembly.
The performance of the lithium ion battery was examined. As shown in fig. 6, the lithium battery capacity of the material is less than 140mAh/g after 100 cycles under the charging and discharging conditions of 3V to 4.5V and the current density of 0.33C. The fact that the proper calcination temperature has an important influence on the surface coating of the material and the lithium electrochemical performance of the material is also shown.
Comparative example 2
The preparation method of the aluminum oxide coated NCM cathode material comprises the following steps:
s10, precursor material preparation: 1-2g of aluminum nitrate is dissolved in 100ml of absolute ethyl alcohol, magnetic stirring is carried out for 1h to obtain a clear solution, 10g of NCM811 ternary material is added into the solution, stirring is carried out for 2h, the material is subjected to reduced pressure distillation to remove ethanol, the obtained material is subjected to vacuum drying for 6h, and finally, a dried prepolymer is obtained.
S20, calcining: calcining the precursor material in oxygen-containing gas, wherein the oxygen-containing gas is mixed gas of oxygen and nitrogen, and the volume percentage of the oxygen is 60%; the calcination conditions were: calcining for 2h at 700 ℃, heating up at the rate of 5 ℃/min, and naturally cooling. And grinding the calcined black product into powder to obtain the aluminum oxide coated NCM cathode material.
The aluminum oxide on the surface of the test material shows that the particles are not completely coated, obvious gaps exist among the particles, and the surface appearance is dissolved.
And (2) coating the obtained aluminum oxide coated NCM cathode material, conductive carbon black and PVDF according to the mass ratio of 8:1:1, proportioning, placing in NMP, stirring to be uniform slurry, coating on a current collector aluminum foil, blowing and drying the moisture contained in the current collector aluminum foil for 6 hours at 80 ℃, and uniformly cutting the aluminum foil loaded with the electrode active material into a wafer with the diameter of 14 mm. In a glove box filled with high-purity argon, metal lithium was used as a counter electrode, and a 1m lipff 6 EC-EMC (1) conventional electrolyte and a separator were added to perform CR2032 type button cell assembly.
The performance of the lithium ion battery was examined. As shown in fig. 6, the lithium capacity of the material is less than 145mAh/g after 100 cycles under the charge-discharge conditions of 3V to 4.5V and the current density of 0.33C. The demonstration shows that the proper calcining oxygen atmosphere has important influence on the surface coating layer of the material and the lithium electrochemical performance of the material.
FIG. 6 is a graph of the cycle of the alumina-coated NCM positive electrode materials prepared in example 1, example 2, comparative example 1, and comparative example 2 at a voltage of 3V to 4.5V and a current density of 0.33C over 100 cycles; it can be seen from the figure that there is a significant difference in the NCM long cycle with alumina coating after the first cycle under different coating conditions, the capacity of the condition optimized example is stable, and the comparative example has a significant capacity fade.
The above embodiments are only preferred embodiments of the present invention, and the protection scope of the present invention should not be limited thereby, and any insubstantial changes and substitutions made by those skilled in the art based on the present invention are within the protection scope of the present invention.

Claims (10)

1. The preparation method of the aluminum oxide coated NCM cathode material is characterized by comprising the following steps:
s10, precursor material preparation: mixing a liquid phase of an NCM positive electrode material with a solvent containing aluminum nitrate, uniformly stirring, and then carrying out vacuum drying to obtain a precursor material;
s20, calcining: and (3) putting the precursor material into oxygen-containing gas for calcination, and grinding the calcined black product into powder to obtain the catalyst.
2. The method of preparing the alumina-coated NCM positive electrode material according to claim 1, wherein in step S10, the NCM positive electrode material is an NCM811 type ternary material.
3. The method for preparing an aluminum oxide-coated NCM positive electrode material according to claim 1, wherein in step S10, the molar ratio of aluminum in the aluminum nitrate-containing solvent to the NCM positive electrode material is 1.
4. The method for preparing the aluminum oxide coated NCM cathode material according to claim 1, wherein in the step S10, the mass ratio of the aluminum nitrate-containing solvent to the NCM cathode material is 1.
5. The method for preparing an alumina-coated NCM positive electrode material according to claim 1, wherein in step S10, the solvent is an alcohol solvent, preferably ethanol.
6. The method for preparing the aluminum oxide coated NCM cathode material according to claim 1, wherein in the step S20, the oxygen-containing gas is a mixed gas of oxygen and nitrogen, wherein the volume percentage of the oxygen is 85-100%.
7. The method for producing an alumina-coated NCM positive electrode material according to claim 1, wherein in step S20, the calcination conditions are: heating to 700-720 ℃ at a heating rate of 3-7 ℃/min, and preserving heat for 2-3h.
8. An alumina-coated NCM positive electrode material, characterized in that the alumina-coated NCM positive electrode material is obtained by the production method according to any one of claims 1 to 7.
9. Use of an alumina-coated NCM positive electrode material according to any one of claims 1 to 7 in the preparation of a lithium ion battery.
10. The use of claim 9, wherein the method of making the lithium ion battery comprises: coating an aluminum oxide on an NCM positive electrode material, conductive carbon black and PVDF according to the mass ratio of 8:1:1 or 96:2:2, proportioning, placing the mixture into NMP, stirring the mixture to be uniform slurry, coating the slurry on a current collector aluminum foil, blowing and drying the moisture in a drying box at 80 ℃ for 6 hours, and uniformly cutting the aluminum foil loaded with the electrode active material into wafers with the diameter of 14 mm; and in a glove box filled with high-purity argon, adding lithium metal serving as a counter electrode into the glove box, adding lithium battery electrolyte and a diaphragm, and assembling the CR2032 button cell.
CN202211274222.3A 2022-10-18 2022-10-18 Aluminum oxide coated NCM positive electrode material and preparation method and application thereof Pending CN115504523A (en)

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