CN111430705A - Positive electrode material of lithium ion battery and preparation method thereof - Google Patents

Positive electrode material of lithium ion battery and preparation method thereof Download PDF

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CN111430705A
CN111430705A CN201911040257.9A CN201911040257A CN111430705A CN 111430705 A CN111430705 A CN 111430705A CN 201911040257 A CN201911040257 A CN 201911040257A CN 111430705 A CN111430705 A CN 111430705A
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positive electrode
electrode material
aluminum
core
titanium
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江卫军
乔齐齐
许鑫培
施泽涛
马加力
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Svolt Energy Technology Co Ltd
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Svolt Energy Technology Co Ltd
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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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B82—NANOTECHNOLOGY
    • B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
    • B82Y30/00—Nanotechnology for materials or surface science, e.g. nanocomposites
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
    • C01G53/00—Compounds of nickel
    • C01G53/006—Compounds containing, besides nickel, two or more other elements, with the exception of oxygen or hydrogen
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/36—Selection of substances as active materials, active masses, active liquids
    • H01M4/48—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides
    • H01M4/50—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of manganese
    • H01M4/505—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of manganese of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
    • H01M4/624—Electric conductive fillers
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2004/00—Particle morphology
    • C01P2004/01—Particle morphology depicted by an image
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2006/00—Physical properties of inorganic compounds
    • C01P2006/40—Electric properties
    • 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 positive electrode material of a lithium ion battery and a preparation method thereof. The positive electrode material of the lithium ion battery has a core-shell structure, the material for forming the shell of the core-shell structure is composed of a titanium compound and an aluminum compound, the titanium compound comprises at least one of titanium dioxide and tetrabutyl titanate, and the aluminum compound comprises at least one of aluminum oxide, aluminum hydroxide and aluminum ethoxide. According to the anode material provided by the invention, the outer surface of the core material is coated with titanium and aluminum, the titanium coating can solve the conductivity of the anode material, and the aluminum coating can improve the cycling stability of the anode material and reduce the gas production rate, so that the surface impedance of the anode material can be reduced by the coated shell, and the first charge-discharge coulombic efficiency of the anode material is further improved.

Description

Positive electrode material of lithium ion battery and preparation method thereof
Technical Field
The invention relates to the technical field of lithium ion batteries, in particular to a positive electrode material of a lithium ion battery and a preparation method thereof.
Background
Although research shows that the cobalt-free high-nickel cathode material has the advantages of high capacity, low cost and the like, the first charge-discharge reversibility of the cobalt-free binary layered material is poor, so that the first charge-discharge coulombic efficiency is low, and the energy density of the material is influenced.
According to 2019 published by academy J.R.Dahn, the composition is L iNi0.9Mn0.1O2And L iNi0.9Al0.1O2The first charge-discharge coulombic efficiencies of the cobalt-free material are 85.9 percent and 84.9 percent respectively, and the cobalt-containing L iNi0.9Co0.05Al0.05The first charge-discharge coulombic efficiency of O2 can reach 89%, in addition, in the 2017 Shuoshi Rowu paper of Jiangxi theory of science and technology, the composition is L iNi0.7Mn0.3O2The first charge-discharge coulombic efficiency of the cobalt-free material is 71-75%.
The reduction in first charge-discharge coulombic efficiency results in a reduction in the energy density of the material. Therefore, in order to develop a cobalt-free cathode material with high energy density, a new technology needs to be developed to improve the first charge-discharge coulombic efficiency.
Disclosure of Invention
The present invention has been completed based on the following findings of the inventors:
in order to solve the problem that the first charge-discharge coulombic efficiency of a cobalt-free cathode material is low, the invention designs a preparation method for improving the first coulombic efficiency of a cobalt-free nickel-manganese cathode material through co-coating.
In a first aspect of the invention, the invention provides a positive electrode material of a lithium ion battery.
According to an embodiment of the present invention, the positive electrode material has a core-shell structure, a material forming an outer shell of the core-shell structure is formed of a titanium compound and an aluminum compound, and the titanium compound includes at least one of titanium dioxide and tetrabutyl titanate, and the aluminum compound includes at least one of aluminum oxide, aluminum hydroxide, and aluminum ethoxide.
The inventor finds that the outer surface of the core material of the positive electrode material is coated with titanium and aluminum, the coating of the titanium can solve the conductivity of the positive electrode material, the coating of the aluminum can improve the cycle stability of the positive electrode material and reduce the gas production rate, and therefore the surface impedance of the positive electrode material can be reduced by the coated shell, and further the first charge-discharge coulomb efficiency of the positive electrode material is improved.
In addition, the positive electrode material according to the above embodiment of the present invention may further have the following additional technical features:
according to an embodiment of the invention, the compound of titanium is titanium dioxide and the compound of aluminum is aluminum oxide.
According to the embodiment of the invention, the material for forming the core of the core-shell structure is layered lithium nickel manganese oxide.
According to the embodiment of the invention, the specific surface area of the cathode material is 0.1-0.5 m2/g。
According to the embodiment of the invention, the particle size D50 of the cathode material is 3-15 microns.
In a second aspect of the invention, the invention provides a method for preparing the above-mentioned positive electrode material for a lithium ion battery.
According to an embodiment of the invention, the method comprises: (1) providing a kernel; (2) and performing coating treatment on the surface of the inner core to obtain the cathode material with a core-shell structure, wherein the raw materials for coating treatment comprise a titanium compound and an aluminum compound.
The inventor finds that by adopting the preparation method provided by the embodiment of the invention, the surface impedance is reduced and the first charge-discharge coulombic efficiency is improved by coating the titanium and the aluminum on the outer surface of the core of the positive electrode material, and the preparation method is simple and convenient to operate and has the potential of large-scale industrial production.
In addition, the preparation method according to the above embodiment of the present invention may further have the following additional technical features:
according to an embodiment of the present invention, the step (1) comprises: (1-1) mixing lithium hydroxide with nickel manganese hydroxide to obtain a first mixture; (1-2) subjecting the first mixture to a first calcination treatment and a crushing treatment to obtain the inner core.
According to an embodiment of the present invention, the step (2) includes: (2-1) mixing the inner core with nano titanium dioxide and nano aluminum oxide to obtain a second mixture; (2-2) subjecting the second mixture to a second calcination treatment to obtain the positive electrode material.
According to an embodiment of the present invention, in the second mixture, the content of the titanium element is 0.15 to 0.25 wt%, and the content of the aluminum element is 0.05 to 0.15 wt%.
According to the embodiment of the invention, the first calcination treatment is performed at 720-870 ℃ for 8-12 hours, and the second calcination treatment is performed at 300-600 ℃ for 4-8 hours.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The foregoing aspects of the invention are explained in the description of the embodiments with reference to the following drawings, in which:
fig. 1 is a schematic cross-sectional structure of a positive electrode material having a core-shell structure according to an embodiment of the present invention;
fig. 2 is a graph comparing charge and discharge curves of a positive electrode material before and after coating according to an embodiment of the present invention;
FIG. 3 is a graph comparing the cycling curves of a positive electrode material before and after coating in accordance with one embodiment of the present invention;
fig. 4 is a schematic flow chart of a method for preparing a cathode material according to an embodiment of the present invention;
FIG. 5 is an electron micrograph of an inner core before (a) (b) and after (c) (d) coating according to one embodiment of the present invention;
fig. 6 is an elemental analysis diagram of the core before (a) and after (b) coating according to one embodiment of the present invention.
Detailed Description
The following examples of the present invention are described in detail, and it will be understood by those skilled in the art that the following examples are intended to illustrate the present invention, but should not be construed as limiting the present invention. Unless otherwise indicated, specific techniques or conditions are not explicitly described in the following examples, and those skilled in the art may follow techniques or conditions commonly employed in the art or in accordance with the product specifications.
In one aspect of the invention, the invention provides a positive electrode material of a lithium ion battery.
According to an embodiment of the present invention, referring to fig. 1, the cathode material has a core-shell structure, that is, a shell 200 covers an inner core 100, and a material forming the shell 200 of the core-shell structure is composed of a compound of titanium (Ti) and a compound of aluminum (Al), and the compound of titanium includes at least one of titanium dioxide and tetrabutyl titanate, and the compound of aluminum includes at least one of aluminum oxide, aluminum hydroxide, and aluminum ethoxide. In the research process, the inventor of the invention finds that the first charge-discharge reversibility of the cobalt-free nickel-manganese binary layered cathode material is poor, and the first charge-discharge coulombic efficiency is generally lower than 86%, so that the energy density of the cobalt-free nickel-manganese cathode material is influenced. Therefore, the inventor tries to coat titanium and aluminum on the surface of the material such as layered lithium nickel manganese oxide together, the coating of the titanium can solve the problem of conductivity of the positive electrode material, the coating of the aluminum can improve the cycle stability of the positive electrode material and reduce the gas production rate, so that the surface impedance of the positive electrode material can be reduced by the coated shell, and further the first charge-discharge coulombic efficiency of the positive electrode material is improved.
In some embodiments of the invention, the titanium compound may be selected from titanium dioxide (TiO)2) And the compound of aluminum is aluminum oxide (Al)2O3) Thus, not only can the titanium dioxide and titanium dioxide reduce the surface impedance of the cathode material, but also the gas production of the cathode material can be reduced and the circulation of the cathode material can be improved by the housing 200 composed of titanium dioxide and titanium dioxideRing life.
In some embodiments of the invention, the material forming the core of the core-shell structure may be layered lithium nickel manganese oxide (L i)xNiaMnbO2Wherein 1 is<x<1.10、1:1<a:b<19:1 and a + b is 1), so that the outer shell 200 formed by titanium and aluminum can coat the inner core 100 formed by the cobalt-free layered lithium nickel manganese oxide material, thereby reducing the surface impedance of the cathode material and further improving the first charge-discharge coulombic efficiency of the cobalt-free binary layered cathode material.
In some specific examples of the present invention, the specific surface area of the positive electrode material may be 0.1 to 0.5m2The particle size D50 of the positive electrode material is 3-15 micrometers, namely the corresponding particle size is 3-15 micrometers when the cumulative particle size distribution percentage of the positive electrode material reaches 50%. Therefore, the prepared cathode material particles with the particle size and the specific surface area can enable the first charge-discharge coulombic efficiency and the energy density of the binary layered cathode material without cobalt to be higher.
In some embodiments of the present invention, the content of the titanium element may be 0.15 to 0.25 wt%, and the content of the aluminum element may be 0.05 to 0.15 wt%, so that the first efficiency of the cathode material can be improved by 4% by only coating the outer surface of the core 100 with the titanium compound and the aluminum compound of the above contents.
Specifically, the inventors have addressed the cobalt-free cathode material L iNi0.75Mn0.25O2Before and after coating, first cycle charge and discharge curves were respectively tested, as shown in fig. 2, and 50 cycle performance tests were performed after assembling the positive electrode materials before and after coating into a button cell, and the results are shown in fig. 3, and the charging data of the positive electrode materials before and after coating can be referred to table 1. As can be seen from FIG. 2, the initial specific charge capacity of the uncoated positive electrode material under the condition of 0.1C is 205.9mAh/g, the specific discharge capacity is 176.0mAh/g, and the initial specific charge capacity of the positive electrode material coated with titanium dioxide and aluminum oxide under the condition of 0.1C is 205.8mAh/g, and the specific discharge capacity is 184.2 mAh/g. As can be seen from FIG. 3, the 50-cycle retention rate of the uncoated positive electrode material was 98.8%, while the 50-cycle retention rate of the coated positive electrode material was 99.7%. As can be seen from table 1, the first efficiency of the uncoated positive electrode material is only 85.5%, and the first efficiency of the coated positive electrode material is 89.5%, which indicates that the first efficiency is improved by 4% after co-coating of Ti and Al; the discharge capacities of the uncoated positive electrode material and the coated positive electrode material under the condition of 0.1C are 176.0mAh/g and 184.2mAh/g respectively, which shows that the 0.1C capacity of the coated positive electrode material is improved by 8.2 mAh/g; the discharge capacity of the uncoated positive electrode material under the condition of 1C is 158.6mAh/g, and the 1C discharge capacity after coating reaches 163.7mAh/g, which shows that the 1C capacity of the coated positive electrode material is improved by 5.1 mAh/g. Therefore, it is demonstrated that co-cladding of Ti and Al improves the capacity and first efficiency of the positive electrode material.
TABLE 1 comparison of charging data for positive electrode materials before and after coating
Sample (I) 0.1C capacity (mAh/g) First efficiency (%) 1C Capacity (mAh/g) 50-week cycle capacity retention (%)
Is not coated 176.0 85.5 158.6 98.8
After coating 184.2 89.5 163.7 99.7
In summary, according to the embodiments of the present invention, the present invention provides a cathode material, wherein the outer surface of the core material is coated with titanium and aluminum, the coating of titanium can solve the conductivity of the cathode material, and the coating of aluminum can improve the cycling stability of the cathode material and reduce the gas production, so that the surface impedance of the cathode material can be reduced by the coated casing, and further the first charging and discharging coulomb efficiency of the cathode material can be improved.
In another aspect of the invention, the invention provides a method for preparing the above-mentioned cathode material of the lithium ion battery. According to an embodiment of the invention, referring to fig. 4, the method comprises:
s100: a kernel is provided.
In this step, core 100 may be provided directly, and in particular, core 100 may be formed from layered lithium nickel manganese oxide, in some embodiments of the present invention, step S100 may include S110 initially forming lithium hydroxide (L iOH) and nickel manganese hydroxide (Ni)aMnb(OH)2Wherein a is more than or equal to 0.55 and less than or equal to 0.95 and b is more than or equal to 0.05 and less than or equal to 0.45), specifically, for example, mixing for 5 to 20 minutes by using a high-speed mixing device, or using a laboratory 5L device with the rotating speed of 2000 to 3000rpm, or using a laboratory 100L device with the rotating speed of 800 to 900rpm, and the material filling efficiency in the device is 30 to 70%, so that a first mixture can be obtained, and S120, then, performing a first calcination treatment and crushing treatment on the first mixture to obtain the inner core 100.
In some specific examples of the invention, the first calcination treatment may be a reaction at 720-870 ℃ for 8-12 hours, specifically, for example, a reaction at 720-870 ℃ for 8-12 hours in an oxygen atmosphere with a concentration greater than 95%, so that after calcination under the above conditions, a roller pair or other mechanical crushing manner is continuously adopted, and the layered lithium nickel manganese oxide particles sieved by a 300-400 mesh sieve can be obtained.
S200: and coating the surface of the inner core to obtain the cathode material with the core-shell structure.
In this step, a coating treatment is performed on the surface of the inner core 100 to obtain a positive electrode material having a core-shell structure, wherein the raw material for the coating treatment includes a compound of titanium (Ti) and a compound of aluminum (Al).
In some embodiments of the present invention, step S200 may comprise: s210 mixing the core with nano-titanium dioxide (TiO)2) Nano alumina (Al)2O3) Continuously mixing by adopting high-speed mixing equipment to obtain a second mixture; s230 performs a second calcination process on the second mixture to obtain a cathode material. Therefore, the core can be coated by a dry method, and the surface impedance of the cathode material with the outer surface coated with titanium dioxide and aluminum oxide is lower and the first charge-discharge coulombic efficiency is higher.
In some embodiments of the present invention, in the second mixture, the content of titanium element is 0.15 to 0.25 wt%, the content of aluminum element is 0.05 to 0.15 wt%, and the molar ratio of titanium element to aluminum element is controlled to be 0.5 to 1.5, preferably 1. In this way, the nanoparticles having the above ratio range can be uniformly attached to the outer surface of the core 100 by using a particle size of 10 to 100nm (preferably 50nm or less), and the surface resistance of the positive electrode material can be reduced by the calcination treatment.
In some embodiments of the present invention, the second calcination treatment may be performed at 300-600 ℃ for 4-8 hours, for example, the coated second mixture is treated at 300-600 ℃ for 4-8 hours, and the high temperature treatment is performed in an oxygen atmosphere with a concentration of 20-100%. Thus, after the steps of coating and calcining, the anode material with the particle size distribution D50 of 3-15 microns can be obtained by screening through a 300-400-mesh sieve.
Specifically, the inventors respectively perform Scanning Electron Microscope (SEM) observation on the positive electrode material before and after coating, and refer to fig. 5, where (a) and (b) of fig. 5 are the morphology of the core 100 before coating, and (c) and (d) of fig. 5 are the morphology of the positive electrode material after coating. As can be seen from fig. 5, the SEM photograph clearly shows that the coating is present on the surface of the coated positive electrode material. To further characterize the presence of the coating, the inventors continued elemental analysis (EDS-ICP) of the particles in the SEM field, and the EDS plot of the positive electrode material before and after coating is shown in fig. 6, where (a) of fig. 6 represents the core 100 before coating, and (b) of fig. 6 represents the positive electrode material after coating, and the abscissa in fig. 6 is the energy (energy). The ICP results of the positive electrode materials before and after coating are shown in table 2.
TABLE 2 ICP data for positive electrode materials before and after coating
Figure BDA0002252643390000051
In summary, according to the embodiments of the present invention, the present invention provides a preparation method, in which titanium and aluminum are coated on the outer surface of the core of the positive electrode material, so as to obtain the positive electrode material with reduced surface impedance and improved first charge and discharge coulombic efficiency, and the preparation method is simple and convenient to operate and has a potential for large-scale industrial production.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.

Claims (10)

1. The positive electrode material of the lithium ion battery is characterized in that the positive electrode material has a core-shell structure, a material for forming a shell of the core-shell structure is composed of a titanium compound and an aluminum compound, the titanium compound comprises at least one of titanium dioxide and tetrabutyl titanate, and the aluminum compound comprises at least one of aluminum oxide, aluminum hydroxide and aluminum ethoxide.
2. The positive electrode material according to claim 1, wherein the compound of titanium is titanium dioxide, and the compound of aluminum is aluminum oxide.
3. The positive electrode material according to claim 1, wherein a material forming the core of the core-shell structure is layered lithium nickel manganese oxide.
4. According to claimThe positive electrode material according to claim 1, wherein the specific surface area of the positive electrode material is 0.1 to 0.5m2/g。
5. The positive electrode material according to claim 1, wherein the particle size D50 of the positive electrode material is 3-15 μm.
6. A method for preparing the positive electrode material of the lithium ion battery according to any one of claims 1 to 5, comprising:
(1) providing a kernel;
(2) and performing coating treatment on the surface of the inner core to obtain the cathode material with a core-shell structure, wherein the raw materials for coating treatment comprise a titanium compound and an aluminum compound.
7. The method of claim 6, wherein step (1) comprises:
(1-1) mixing lithium hydroxide with nickel manganese hydroxide to obtain a first mixture;
(1-2) subjecting the first mixture to a first calcination treatment and a crushing treatment to obtain the inner core.
8. The method of claim 7, wherein the step (2) comprises:
(2-1) mixing the inner core with nano titanium dioxide and nano aluminum oxide to obtain a second mixture;
(2-2) subjecting the second mixture to a second calcination treatment to obtain the positive electrode material.
9. The method according to claim 8, wherein the second mixture contains 0.15 to 0.25 wt% of titanium and 0.05 to 0.15 wt% of aluminum.
10. The method of claim 8, wherein the first calcination treatment is performed at 720 to 870 ℃ for 8 to 12 hours, and the second calcination treatment is performed at 300 to 600 ℃ for 4 to 8 hours.
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114899376A (en) * 2022-05-11 2022-08-12 井冈山大学 Lithium aluminum phosphate fluoride-coated positive electrode material and preparation method thereof

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