Antimony chalcogenide-coated lithium cobalt oxide positive electrode material and its preparation method and application

Abstract

The present invention relates to the field of lithium-ion battery technology, specifically disclosing an antimony sulfide-coated lithium cobalt oxide cathode material, a preparation method thereof, and applications thereof. The preparation method comprises: mixing lithium cobalt oxide powder with an antimony-containing compound, a sulfur-containing compound, and a selenium-containing compound in deionized water to form a uniformly dispersed precursor solution; the molar ratio of the lithium cobalt oxide powder to the antimony-containing, sulfur-containing, and selenium-containing compounds is 1:(0.01-1):(0.01-3):(0.001-2); drying the precursor solution to obtain a solid powder; and calcining the solid powder at 100-500°C under a protective atmosphere to ultimately obtain an antimony sulfide-coated lithium cobalt oxide cathode material. The method for preparing the antimony sulfide-coated lithium cobalt oxide cathode material of the present invention provides an antimony sulfide-coated lithium cobalt oxide cathode material having good structural stability. When used in lithium-ion batteries, the prepared antimony sulfide-coated lithium cobalt oxide cathode material can significantly improve the specific capacity and cycle life of the lithium cobalt oxide battery at high voltage.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium-ion batteries, and in particular to an antimony chalcogenide-coated lithium cobalt oxide positive electrode material, and a preparation method and application thereof. Background Art

[0002] Lithium cobalt oxide is a relatively mature cathode material in lithium-ion batteries and has been widely used in the field of 3C electronic products. However, with the increasing demand for high specific energy of lithium-ion batteries, lithium cobalt oxide materials are facing the challenge of developing in the direction of high voltage and high specific capacity. In the process of increasing the voltage, the structure of the battery material will undergo irreversible changes, resulting in a significant attenuation of the electrochemical performance. To this end, the industry has tried to modify the material by surface coating, but the general coating material has poor conductivity, which hinders the transport of lithium ions in the system; at the same time, the coating material has insufficient tolerance to the lattice strain generated during the lithium ion insertion and extraction process, resulting in a decrease in structural stability, which is not conducive to the performance of the battery. Therefore, finding a more effective modification method is still a key issue to be solved in the current lithium cobalt oxide battery.

[0003] Currently, there are public efforts to use antimony oxide layers to coat lithium cobalt oxide to enhance its interfacial stability and impart good structural stability. However, antimony oxide is a wide-bandgap semiconductor (3.6-4 eV) with extremely poor conductivity and a low lithium ion diffusion coefficient, which increases interfacial impedance and reduces rate performance. Antimony oxide is also brittle and lattice-mismatched with lithium cobalt oxide. Long-term charge and discharge processes can easily cause the coating to crack and detach, leading to severe interfacial side reactions.

[0004] Publication No. CN 112447948 B discloses a sulfide-coated positive electrode material, a preparation method thereof, and a lithium-ion battery. The sulfide coating layer is coated on the surface of a lithium-containing positive electrode material. The preparation is specifically carried out by the following steps: stirring and mixing the lithium-containing positive electrode material with anhydrous ethanol, introducing hydrogen sulfide gas, stirring the reaction, solid-liquid separation, and drying to obtain a positive electrode material with lithium sulfide on the surface; under a protective atmosphere, mixing the positive electrode material with lithium sulfide on the surface with auxiliary components and a stabilizer in a coating machine, and then placing the mixed product in a closed quartz tube and heat treating it under a protective atmosphere to obtain a sulfide-coated positive electrode material. The positive electrode material prepared by this patent has good surface structural stability, high ionic conductivity, low interfacial impedance, low residual alkali, and excellent cycle stability. However, this patent has the following shortcomings: when preparing the battery positive electrode, the positive electrode active material, the binder polyvinylidene fluoride, and the conductive agent (SP conductive agent) are mixed in a ratio of 96:2:2, the amount of positive electrode active material used is large, and the preparation steps of this patent are relatively complicated, requiring the introduction of toxic hydrogen sulfide gas and the mixing in a coating machine, and the experimental conditions are relatively harsh. In addition, this patent uses hydrogen sulfide gas and lithium-containing positive electrode materials to react at the interface to prepare the lithium sulfide coating layer, resulting in a decrease in interface quality, a large number of defects, and the sacrifice of some lithium element content. Summary of the Invention

[0005] To address the above shortcomings, the present invention provides an antimony chalcogenide-coated lithium cobalt oxide positive electrode material, a preparation method, and an application thereof. The prepared antimony chalcogenide-coated lithium cobalt oxide positive electrode material has good structural stability and can improve the specific capacity and cycle life of lithium cobalt oxide batteries at high voltages. The specific technical solutions are as follows:

[0006] A method for preparing an antimony chalcogenide-coated lithium cobalt oxide positive electrode material comprises the following steps:

[0007] (1) mixing lithium cobalt oxide powder with an antimony-containing compound, a sulfur-containing compound, and a selenium-containing compound in deionized water, and stirring for a certain period of time after ultrasonication to form a uniformly dispersed precursor solution; the molar ratio of the lithium cobalt oxide powder to the antimony-containing compound, the sulfur-containing compound, and the selenium-containing compound is 1:(0.01-1):(0.01-3):(0.001-2);

[0008] (2) drying the precursor solution obtained in step (1) to obtain a solid powder;

[0009] (3) The solid powder obtained in step (2) is calcined at 100-500° C. under a protective atmosphere to finally obtain an antimony sulfide-coated lithium cobalt oxide positive electrode material.

[0010] Preferably, in the method for preparing the antimony chalcogenide-coated lithium cobalt oxide cathode material described above, the antimony-containing compound is one or more of antimony trichloride, antimony acetate, potassium antimonyl tartrate, antimony trifluoride, antimony triiodide, and antimony sulfate.

[0011] Preferably, in the method for preparing the antimony chalcogenide-coated lithium cobalt oxide cathode material described above, the sulfur-containing compound is one or more of thiourea, thioacetamide, sodium thiosulfate pentahydrate, sodium sulfite, cysteine, sulfur powder, and selenium disulfide.

[0012] Preferably, in the method for preparing the antimony chalcogenide-coated lithium cobalt oxide cathode material described above, the selenium-containing compound is one or more of selenourea, selenium disulfide, selenium powder, selenium dioxide, selenocysteine, selenomethionine, sodium selenate, sodium selenite, and sodium selenosulfite.

[0013] Preferably, in the method for preparing the antimony chalcogenide-coated lithium cobalt oxide cathode material described above, in step (1), the ultrasonic treatment time is 5 - 30 min, and the ultrasonic treatment power is 30 - 50 kHz; the stirring time is 10 - 60 min, and the rotation speed is 300 - 700 r / min.

[0014] Preferably, in the method for preparing the antimony chalcogenide-coated lithium cobalt oxide cathode material described above, in step (2), the drying temperature is 70 - 90 °C, and the drying time is 12 - 48 h.

[0015] Preferably, in the method for preparing the antimony chalcogenide-coated lithium cobalt oxide cathode material described above, in step (3), the heating rate is 1 - 10 °C / min, and the holding time is 1 - 10 h.

[0016] Preferably, in the method for preparing the antimony chalcogenide-coated lithium cobalt oxide cathode material described above, the molar ratio of the lithium cobalt oxide powder to the antimony-containing compound, sulfur-containing compound, and selenium-containing compound is 1:(0.05 - 0.1):(0.03 - 0.22):(0.003 - 0.01).

[0017] Preferably, in the method for preparing the antimony chalcogenide-coated lithium cobalt oxide cathode material described above, the antimony chalcogenide is mainly one or more of Sb2S3, Sb2Se3, and Sb2(S x Se 1-x )3 (0 < x < 1).

[0018] Preferably, in the method for preparing the antimony chalcogenide-coated lithium cobalt oxide cathode material described above, the protective atmosphere is nitrogen or argon.

[0019] On the other hand, the present application also provides an antimony sulfide-coated lithium cobalt oxide positive electrode material, which is prepared by the above-mentioned preparation method.

[0020] On the other hand, the present application also provides the use of the above-mentioned antimony sulfide-coated lithium cobalt oxide positive electrode material in the preparation of lithium batteries.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1. The method for preparing an antimony sulfide-coated lithium cobalt oxide cathode material of the present invention. The prepared antimony sulfide-coated lithium cobalt oxide cathode material has good structural stability and can be used in lithium-ion batteries to significantly improve the specific capacity and cycle life of lithium cobalt oxide batteries at high voltage.

[0023] 2. The antimony chalcogenide-coated lithium cobalt oxide cathode material prepared by the present invention has an antimony chalcogenide coating layer coated on the surface of the lithium cobalt oxide, which reduces the contact area between the lithium cobalt oxide particles and the electrolyte. This in turn reduces the occurrence of side reactions and the dissolution of the lithium cobalt oxide material surface during battery cycling, and promotes the stability of the interface between the lithium cobalt oxide and the electrolyte. At the same time, the interaction between lithium and sulfur (Li-S) and lithium and selenium (Li-Se) accelerates the transport of lithium ions in the system, resulting in the cathode material having more excellent electrochemical and cycling performance. The first-cycle discharge capacity is 200.94 mAh / g, and the capacity retention rate is good (85.78%) after 50 cycles.

[0024] 3. The antimony chalcogenide-coated lithium cobalt oxide cathode material prepared by the present invention can change the material's conductivity by adjusting the ratio of sulfur to selenium, which can accelerate lithium ion transmission. In addition, S-Se bonds can be formed between selenium and sulfur, enhancing the stability of the cathode structure and thus improving the performance of lithium-ion batteries.

[0025] 4. The antimony chalcogenide-coated lithium cobalt oxide cathode material prepared by the present invention belongs to the orthorhombic crystal system. Its unique quasi-one-dimensional crystal structure can slow down the volume change of lithium cobalt oxide caused by lithium ion deintercalation and alleviate the lattice expansion stress caused by lithium ion deintercalation, thereby ensuring close contact between the antimony chalcogenide and lithium cobalt oxide, reducing interfacial side reactions and ensuring the structural stability of the cathode material. The same group elements sulfur and selenium tend to competitively bind with lithium, promoting the lithium ion transport dynamics during battery operation. Compared with antimony oxide, antimony chalcogenide has a band gap of 1.1-1.7 eV, and antimony chalcogenide has better conductivity, which can improve the electrochemical performance of the cathode material. The relative ratio of sulfur and selenium in the antimony chalcogenide is adjustable, and the electrochemical performance of the antimony chalcogenide coating layer can be improved by regulating the sulfur / selenium ratio.

[0026] 5. The method for preparing the antimony chalcogenide-coated lithium cobalt oxide positive electrode material of the present invention has a simple process, low equipment requirements, low cost, and is suitable for large-scale production. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] To more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are some embodiments of the present invention, and those skilled in the art can derive other drawings based on these drawings without inventive effort.

[0028] Figure 1 This is a schematic diagram of the preparation process of the antimony sulfide-coated lithium cobalt oxide positive electrode material provided by the present invention.

[0029] Figure 2 These are the XRD, SEM and element distribution diagrams of the pure lithium cobalt oxide positive electrode material provided by the present invention.

[0030] Figure 3 The Sb2(S x Se 1-x )3 XRD, SEM and element distribution diagram of coated lithium cobalt oxide positive electrode material.

[0031] Figure 4 These are the XRD, SEM and element distribution diagrams of the Sb2S3-coated lithium cobalt oxide positive electrode material in Comparative Example 3 provided by the present invention.

[0032] Figure 5 These are the XRD, SEM and element distribution diagrams of the Sb2Se3-coated lithium cobalt oxide positive electrode material in Comparative Example 4 provided by the present invention.

[0033] Figure 6 Graph showing the first cycle charge and discharge test results of Example 1 and Comparative Example 1 of the present invention.

[0034] Figure 7 This is a cycle performance diagram of Example 1 and Comparative Example 1 in the present invention from 0 to 50 cycles at a rate of 1C. DETAILED DESCRIPTION

[0035] The specific embodiments of the present invention are described in detail below, but it should be understood that the scope of protection of the present invention is not limited by the specific embodiments. Unless otherwise defined, all technical terms used hereinafter have the same meaning as those generally understood by those skilled in the art. The technical terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the scope of protection of the present invention. Unless otherwise specified, the various raw materials, reagents, instruments and equipment used in the present invention can be purchased from the market or can be prepared by existing methods.

[0036] Example 1

[0037] A method for preparing an antimony chalcogenide-coated lithium cobalt oxide positive electrode material, such as Figure 1 As shown, the specific steps include:

[0038] (1) 98 g of commercial lithium cobalt oxide powder, 20 g of antimony trichloride, 10 g of sodium thiosulfate pentahydrate, and 1 g of selenourea were added to a beaker, and then 350 ml of deionized water was added. The mixture was ultrasonically treated at an ultrasonic power of 30 kHz for 10 min, and then the solution was stirred for 20 min at a speed of 500 r / min to obtain a precursor solution.

[0039] (2) The solution stirred in step (1) was placed in a drying oven and dried at 90°C for 36 hours to obtain a precipitate;

[0040] (3) The precipitate after drying in step (2) was transferred into a quartz crucible, placed in a high-temperature furnace, and calcined at 300°C under the protection of inert atmosphere argon, with a heating rate of 5°C / min and a holding time of 6h. After natural cooling, Sb2(S x Se 1-x )3 positive electrode material coated with lithium cobalt oxide.

[0041] The XRD, SEM and element distribution diagrams of the positive electrode material prepared in this example are shown in Figure 3 As can be seen from the figure, the elements are evenly distributed and antimony sulfide is successfully coated on the surface of lithium cobalt oxide. XRD results show that antimony sulfide is an alloy phase composed of Sb2S3 and Sb2Se3.

[0042] Example 2

[0043] This embodiment provides a method for preparing an antimony chalcogenide-coated lithium cobalt oxide positive electrode material, which specifically includes the following steps:

[0044] (1) 98 g of commercial lithium cobalt oxide powder, 20 g of antimony trichloride, 15 g of thiourea, and 1 g of selenourea were added to a beaker, and then 350 ml of deionized water was added. The mixture was ultrasonically treated at an ultrasonic power of 30 kHz for 10 min, and then the solution was stirred for 20 min at a speed of 500 r / min to obtain a precursor solution.

[0045] (2) The solution stirred in step (1) was placed in a drying oven and dried at 90°C for 36 hours to obtain a precipitate;

[0046] (3) The precipitate after drying in step (2) was transferred into a quartz crucible, placed in a high-temperature furnace, and calcined at 300°C under the protection of inert atmosphere argon, with a heating rate of 5°C / min and a holding time of 6h. After natural cooling, Sb2(S x Se 1-x )3 positive electrode material coated with lithium cobalt oxide.

[0047] Example 3

[0048] This embodiment provides a method for preparing an antimony chalcogenide-coated lithium cobalt oxide positive electrode material, which specifically includes the following steps:

[0049] (1) 98 g of commercial lithium cobalt oxide powder, 20 g of antimony trichloride, 10 g of thioacetamide, and 0.5 g of selenourea were added to a beaker, and then 350 ml of deionized water was added. The mixture was ultrasonically treated at an ultrasonic power of 30 kHz for 10 min, and then the solution was stirred for 20 min at a speed of 500 r / min to obtain a precursor solution.

[0050] (2) The solution stirred in step (1) was placed in a drying oven and dried at 90°C for 36 hours to obtain a precipitate;

[0051] (3) The precipitate after drying in step (2) was transferred into a quartz crucible, placed in a high-temperature furnace, and calcined at 300°C under the protection of inert atmosphere argon, with a heating rate of 5°C / min and a holding time of 6h. After natural cooling, Sb2(S x Se 1-x )3 positive electrode material coated with lithium cobalt oxide.

[0052] Example 4

[0053] This embodiment provides a method for preparing an antimony chalcogenide-coated lithium cobalt oxide positive electrode material, which specifically includes the following steps:

[0054] (1) 98 g of commercial lithium cobalt oxide powder, 20 g of antimony trichloride, 10 g of thioacetamide, and 0.5 g of selenium powder were added to a beaker, and then 350 ml of deionized water was poured in. The mixture was ultrasonically treated at an ultrasonic power of 30 kHz for 10 min, and then the solution was stirred for 20 min at a speed of 500 r / min to obtain a precursor solution.

[0055] (2) The solution stirred in step (1) was placed in a drying oven and dried at 90°C for 36 hours to obtain a precipitate;

[0056] (3) The precipitate after drying in step (2) was transferred into a quartz crucible, placed in a high-temperature furnace, and calcined at 500°C under the protection of inert atmosphere argon, with a heating rate of 5°C / min and a holding time of 8h. After natural cooling, Sb2(S x Se 1-x )3 positive electrode material coated with lithium cobalt oxide.

[0057] Example 5

[0058] This embodiment provides a method for preparing an antimony chalcogenide-coated lithium cobalt oxide positive electrode material, which specifically includes the following steps:

[0059] (1) 98 g of commercial lithium cobalt oxide powder, 20 g of potassium antimony tartrate, 10 g of thioacetamide, and 0.5 g of selenourea were added to a beaker, and then 350 ml of deionized water was added. The mixture was ultrasonically treated at an ultrasonic power of 30 kHz for 30 min, and then the solution was stirred for 60 min at a speed of 500 r / min to obtain a precursor solution.

[0060] (2) The solution stirred in step (1) was placed in a drying oven and dried at 90°C for 36 hours to obtain a precipitate;

[0061] (3) The precipitate after drying in step (2) was transferred into a quartz crucible, placed in a high-temperature furnace, and calcined at 500°C under the protection of inert atmosphere argon, with a heating rate of 7°C / min and a holding time of 10h. After natural cooling, Sb2(S x Se 1-x )3 positive electrode material coated with lithium cobalt oxide.

[0062] Comparative Example 1

[0063] This comparative example is compared with Example 1, except that no antimony trichloride, no sodium thiosulfate pentahydrate, and no selenourea are added in step (1), and the rest of the process is exactly the same as in Example 1.

[0064] Comparative Example 2

[0065] This comparative example is compared with Example 1, except that the calcination temperature in step (3) is set to 400°C and the heating rate is 10°C / min. The rest of the process is exactly the same as Example 1.

[0066] Comparative Example 3

[0067] This comparative example is compared with Example 5, except that selenourea is not added in step (1), and the rest of the process is exactly the same as Example 5.

[0068] The XRD, SEM and element distribution diagram of the positive electrode material prepared in this comparative example are shown in Figure 4 As can be seen from the figure, the elements are evenly distributed and antimony sulfide is successfully coated on the surface of lithium cobalt oxide. XRD results show that the antimony sulfide is Sb2S3.

[0069] Comparative Example 4

[0070] This comparative example is compared with Example 5, except that no thioacetamide is added in step (1) and the mass of selenourea added is 2 g. The rest of the process is exactly the same as Example 5.

[0071] The XRD, SEM and element distribution diagram of the positive electrode material prepared in this comparative example are shown in Figure 5As can be seen from the figure, the elements are evenly distributed and antimony sulfide is successfully coated on the surface of lithium cobalt oxide. XRD results show that the antimony sulfide is Sb2Se3.

[0072] Performance Testing

[0073] The lithium cobalt oxide positive electrode materials prepared in Examples 1-5 and Comparative Examples 1-4 were mixed with acetylene black conductive agent (AB) and PVDF (polyvinylidene fluoride) in a mass ratio of 10:1:1, and N-methylpyrrolidone (NMP) was added as a dispersant. The mixture was stirred in a beaker at 700 rpm for 2 hours to prepare a positive electrode slurry. The slurry was evenly coated on an aluminum foil current collector and dried in an oven at 80°C for 3 hours to obtain a positive electrode sheet. A button cell was assembled in a glove box in the order of negative electrode sheet, electrolyte, separator, electrolyte, and positive electrode sheet, using a glass fiber separator, a lithium metal sheet as the negative electrode, and a 1M LiPF6 solution in propylene carbonate as the electrolyte.

[0074] The assembled battery was tested for electrical performance using a blue electric test system at room temperature. The test voltage range was 3.0-4.6V, and the first cycle was charged and discharged at a rate of 1C to obtain the discharge specific capacity at a rate of 1C. The first cycle charge and discharge test results of Example 1 and Comparative Example 1 are shown in the figure. Figure 6 As shown in Table 1, the first cycle discharge specific capacity of Example 1 is 200.94 mAh / g, the first cycle discharge specific capacity of Comparative Example 1 is 196.58 mAh / g, and the first cycle discharge specific capacity of other positive electrode materials is shown in Table 1.

[0075] Then, the charge and discharge were continued at a rate of 1C for a total of 50 cycles. The cycle capacity retention rate of the battery after 50 cycles was tested. The test results are shown in Table 1. Figure 7 The figure shows the cycle performance of the positive electrode materials of Example 1 and Comparative Example 1 in the present invention at a rate of 1C for 0 to 50 cycles. As can be seen from the figure, the cycle performance of Example 1 is significantly improved compared with that of Comparative Example 1.

[0076] As shown in Table 1, the antimony chalcogenide-coated lithium cobalt oxide cathode material prepared by the method of the present invention exhibits excellent performance in terms of first-cycle discharge capacity, 50-cycle discharge capacity, and cycle capacity retention under high voltage conditions (3.0-4.6V), surpassing overall performance of pure lithium cobalt oxide. This indicates that the antimony chalcogenide-coated lithium cobalt oxide cathode material prepared by the method of the present invention can significantly improve the electrochemical performance of lithium-ion battery cathode materials at high voltages.

[0077] Table 1 Performance data of various cathode materials

[0078]

[0079] The foregoing descriptions of specific exemplary embodiments of the present invention are for purposes of illustration and description. These descriptions are not intended to limit the invention to the precise forms disclosed, and it is apparent that many variations and modifications are possible in light of the foregoing teachings. The exemplary embodiments have been selected and described for the purpose of explaining the specific principles of the invention and their practical application, thereby enabling those skilled in the art to realize and utilize a variety of exemplary embodiments of the invention and various options and modifications. The scope of the invention is intended to be defined by the claims and their equivalents.

Claims

1. A method for preparing an antimony chalcogenide-coated lithium cobalt oxide positive electrode material, characterized in that: The following steps are involved: (1) mixing lithium cobalt oxide powder with an antimony-containing compound, a sulfur-containing compound, and a selenium-containing compound in deionized water, and stirring for a certain period of time after ultrasonication to form a uniformly dispersed precursor solution; the molar ratio of the lithium cobalt oxide powder to the antimony-containing compound, the sulfur-containing compound, and the selenium-containing compound is 1:(0.01-1):(0.01-3):(0.001-2); (2) drying the precursor solution obtained in step (1) to obtain a solid powder; (3) The solid powder obtained in step (2) is calcined at 100-500° C. under a protective atmosphere to finally obtain an antimony sulfide-coated lithium cobalt oxide positive electrode material.

2. The method for preparing the antimony chalcogenide-coated lithium cobalt oxide positive electrode material according to claim 1, characterized in that: The antimony-containing compound is one or more of antimony trichloride, antimony acetate, potassium antimony tartrate, antimony trifluoride, antimony triiodide, and antimony sulfate.

3. The method for preparing the antimony chalcogenide-coated lithium cobalt oxide positive electrode material according to claim 1, characterized in that: The sulfur-containing compound is one or more of thiourea, thioacetamide, sodium thiosulfate pentahydrate, sodium sulfite, cysteine ​​and selenium disulfide.

4. The method for preparing an antimony chalcogenide-coated lithium cobalt oxide positive electrode material according to claim 1, characterized in that: The selenium-containing compound is one or more of selenourea, selenium disulfide, selenium dioxide, selenocysteine, selenomethionine, sodium selenate, sodium selenite and sodium selenite sulfate.

5. The method for preparing the antimony chalcogenide-coated lithium cobalt oxide positive electrode material according to claim 1, characterized in that: In the step (1), the ultrasonic treatment time is 5 to 30 minutes, the ultrasonic treatment power is 30 to 50 kHz; the stirring time is 10 to 60 minutes, and the rotation speed is 300 to 700 r / min.

6. The method for preparing the antimony chalcogenide-coated lithium cobalt oxide positive electrode material according to claim 1, characterized in that: In the step (2), the drying temperature is 70-90° C., and the drying time is 12-48 hours.

7. The method for preparing the antimony chalcogenide-coated lithium cobalt oxide positive electrode material according to claim 1, characterized in that: In the step (3), the heating rate is 1-10°C / min and the holding time is 1-10h.

8. The method for preparing an antimony chalcogenide-coated lithium cobalt oxide positive electrode material according to claim 1, characterized in that: The molar ratio of the lithium cobaltate powder to the antimony-containing compound, the sulfur-containing compound and the selenium-containing compound is 1:(0.05-0.1):(0.03-0.22):(0.003-0.01).

9. An antimony chalcogenide-coated lithium cobalt oxide positive electrode material, characterized in that: The positive electrode material is prepared by the preparation method according to any one of claims 1 to 8.

10. Use of the antimony sulfide-coated lithium cobalt oxide positive electrode material according to claim 9 in the preparation of a lithium battery.

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