Antimony chalcogenide coated lithium cobalt oxide positive electrode material as well as preparation method and application thereof

Abstract

The invention relates to the technical field of lithium ion batteries, and particularly discloses an antimony chalcogenide coated lithium cobalt oxide positive electrode material and a preparation method and application thereof.The preparation method comprises the steps that lithium cobalt oxide powder is mixed with an antimony-containing compound, a sulfur-containing compound and a selenium-containing compound in deionized water, and a uniformly-dispersed precursor solution is formed; the molar ratio of the lithium cobalt oxide powder to the compound containing antimony, sulfur and selenium is 1: (0.01-1): (0.01-3): (0.001-2); drying the precursor solution to obtain solid powder; and calcining the solid powder at 100-500 DEG C in a protective atmosphere to finally obtain the antimony chalcogenide coated lithium cobalt oxide positive electrode material. According to the preparation method of the antimony chalcogenide-coated lithium cobalt oxide positive electrode material, the prepared antimony chalcogenide-coated lithium cobalt oxide positive electrode material has good structural stability, and when the antimony chalcogenide-coated lithium cobalt oxide positive electrode material is used in a lithium ion battery, the specific capacity of the lithium cobalt oxide battery under high voltage can be remarkably improved, and the cycle life of the lithium cobalt oxide battery under high voltage can be remarkably prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium ion batteries, and particularly to an antimony chalcogenide-coated lithium cobalt oxide cathode material, a preparation method thereof, and an 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 in society, the lithium cobalt oxide material is facing challenges in the development towards high voltage and high specific capacity. During 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. Therefore, the industry has tried to modify the material by surface coating, but generally the 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 / extraction process, resulting in a decrease in structural stability and being unfavorable to the performance of the battery. Therefore, finding a more effective modification method is still the key problem to be solved in current lithium cobalt oxide batteries.

[0003] Currently, it has been publicly reported that lithium cobalt oxide is wrapped with an antimony oxide layer to enhance the interfacial stability of lithium cobalt oxide and make it have good structural stability. However, antimony oxide is a wide-bandgap semiconductor material (3.6 - 4 eV), with extremely poor conductivity and a low diffusion coefficient of lithium ions, which will increase the interfacial impedance and reduce the rate performance. Antimony oxide is relatively brittle and has a lattice constant mismatch with lithium cobalt oxide, and it is easy to cause cracking and peeling of the coating layer during long-term charge and discharge processes, resulting in serious interfacial side reactions.

[0004] Publication number CN 112447948 B discloses a sulfide-coated cathode material, its preparation method and a lithium-ion battery. A sulfide coating layer is coated on the surface of a lithium-containing cathode material, and it is specifically prepared through the following steps: After stirring and mixing the lithium-containing cathode material with absolute ethanol, hydrogen sulfide gas is introduced, followed by stirring and reacting, solid-liquid separation, and drying to obtain a cathode material with lithium sulfide on its surface; under a protective atmosphere, the cathode material with lithium sulfide on its surface is mixed with an auxiliary component and a stabilizer in a coating machine, and then the mixed product is placed in a closed quartz tube and heat-treated under a protective atmosphere to obtain a sulfide-coated cathode material; the cathode material prepared by this patent has good surface structure stability, high ionic conductivity, and low interfacial impedance, and has the characteristics of low residual alkali and excellent cycle stability. However, this patent has the following deficiencies: When preparing the battery cathode, the cathode 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 the cathode active material used is large, and the preparation steps of this patent are relatively complex. It is necessary to introduce toxic hydrogen sulfide gas and also to mix in a coating machine, and the experimental conditions are relatively harsh. In addition, this patent uses hydrogen sulfide gas to react with the lithium-containing cathode material at the interface to prepare the lithium sulfide coating layer, resulting in a decline in interface quality, many defects, and at the same time sacrificing part of the Li element content. Summary of the Invention

[0005] In view of the above deficiencies, the present invention provides an antimony chalcogenide-coated lithium cobaltate cathode material, its preparation method and application. The prepared antimony chalcogenide-coated lithium cobaltate cathode material has good structural stability and can improve the specific capacity and cycle life of lithium cobaltate batteries at high voltages. The specific technical solutions are as follows: A preparation method of an antimony chalcogenide-coated lithium cobaltate cathode material, comprising the following steps: (1) Mix lithium cobaltate powder with an antimony-containing compound, a sulfur-containing compound, and a selenium-containing compound in deionized water, ultrasonicate and then stir for a certain time to form a uniformly dispersed precursor solution; the molar ratio of the lithium cobaltate powder to the antimony-containing compound, the sulfur-containing compound, and the selenium-containing compound is 1:(0.01~1):(0.01~3):(0.001~2); (2) Dry the precursor solution obtained in step (1) to obtain a solid powder; (3) Calcinate the solid powder obtained in step (2) at 100~500°C under a protective atmosphere to finally obtain an antimony chalcogenide-coated lithium cobaltate cathode material.

[0006] Preferably, in the above preparation method of the antimony chalcogenide-coated lithium cobaltate cathode material, the antimony-containing compound is one or more of antimony trichloride, antimony acetate, potassium antimonyl tartrate, antimony trifluoride, antimony triiodide, and antimony sulfate.

[0007] 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.

[0008] 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.

[0009] 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.

[0010] 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.

[0011] 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 heat preservation time is 1 - 10 h.

[0012] 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).

[0013] 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).

[0014] Preferably, in the method for preparing the antimony chalcogenide-coated lithium cobalt oxide cathode material described above, the protective atmosphere is nitrogen or argon.

[0015] On the other hand, the present application also provides an antimony chalcogenide-coated lithium cobalt oxide cathode material, which is prepared by the above preparation method.

[0016] On the other hand, the present application also provides the application of the above antimony chalcogenide-coated lithium cobalt oxide cathode material in the preparation of lithium batteries.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. The preparation method of the antimony chalcogenide-coated lithium cobaltate cathode material of the present invention can prepare an antimony chalcogenide-coated lithium cobaltate cathode material with good structural stability. When used in a lithium-ion battery, it can significantly improve the specific capacity and cycle life of the lithium cobaltate battery at high voltages.

[0018] 2. For the antimony chalcogenide-coated lithium cobaltate cathode material prepared by the present invention, the antimony chalcogenide coating layer is coated on the surface of lithium cobaltate, reducing the contact area between the lithium cobaltate particles and the electrolyte, thereby reducing the occurrence of side reactions during battery cycling and the dissolution on the surface of the lithium cobaltate material, and promoting the stability of the interface between lithium cobaltate 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, so that the cathode material has more excellent electrochemical performance and cycling performance. The initial discharge specific capacity is 200.94 mAh / g, and there is also a good capacity retention rate (85.78%) after 50 cycles.

[0019] 3. The antimony chalcogenide-coated lithium cobaltate cathode material prepared by the present invention can change the conductivity of the material by adjusting the ratio of sulfur and selenium, accelerate the transport of lithium ions, and a S-Se bond can be formed between selenium and sulfur to enhance the structural stability of the cathode, thereby improving the performance of the lithium-ion battery.

[0020] 4. In the antimony chalcogenide-coated lithium cobaltate cathode material prepared by the present invention, the antimony chalcogenide belongs to the orthorhombic crystal system. The unique quasi-one-dimensional crystal structure can slow down the volume change of lithium cobaltate caused by the insertion and extraction of lithium ions, relieve the lattice expansion stress caused by the insertion and extraction of lithium ions, make the antimony chalcogenide in close contact with lithium cobaltate, reduce interfacial side reactions, and ensure the structural stability of the cathode material. Homologous elements sulfur and selenium tend to competitively bind with lithium, promoting the kinetics of lithium ion transport during battery operation. Compared with antimony oxides, the band gap of antimony chalcogenides is 1.1 - 1.7 eV, and antimony chalcogenides have better conductivity, which can improve the electrochemical performance of the cathode material. The relative ratio of sulfur and selenium in the antimony chalcogenide can be adjusted, and the electrochemical performance of the antimony chalcogenide coating layer can be achieved by regulating the sulfur / selenium ratio.

[0021] 5. The preparation method of the antimony chalcogenide-coated lithium cobaltate cathode material of the present invention has a simple process, low equipment requirements, and low cost, and is suitable for large-scale production. Description of the Drawings

[0022] To more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0023] Figure 1 Schematic diagram of the preparation process of the lithium cobalt oxide cathode material coated with antimony chalcogenide provided by the present invention.

[0024] Figure 2 XRD, SEM and elemental distribution maps of the pure lithium cobalt oxide cathode material provided by the present invention.

[0025] Figure 3 XRD, SEM and elemental distribution maps of the lithium cobalt oxide cathode material coated with Sb2(S x Se 1-x )3 in Example 1 provided by the present invention.

[0026] Figure 4 XRD, SEM and elemental distribution maps of the lithium cobalt oxide cathode material coated with Sb2S3 in Comparative Example 3 provided by the present invention.

[0027] Figure 5 XRD, SEM and elemental distribution maps of the lithium cobalt oxide cathode material coated with Sb2Se3 in Comparative Example 4 provided by the present invention.

[0028] Figure 6 First-cycle charge-discharge test result graphs of Example 1 and Comparative Example 1 in the present invention.

[0029] Figure 7 Cycling performance graphs of Example 1 and Comparative Example 1 at a 1C rate from 0 to 50 cycles in the present invention. Detailed Embodiments

[0030] The following will describe the detailed embodiments of the present invention in detail, but it should be understood that the protection scope of the present invention is not limited by the detailed embodiments. Unless otherwise defined, all professional terms used hereinafter have the same meaning as commonly understood by those skilled in the art. The professional terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the protection scope of the present invention. Unless otherwise specifically stated, various raw materials, reagents, instruments and equipment used in the present invention can be obtained through the market or prepared by existing methods.

[0031] Example 1 A preparation method of a lithium cobalt oxide cathode material coated with antimony chalcogenide, as Figure 1 shown, specifically includes the following steps: (1) Add 98 g of commercial lithium cobalt oxide powder, 20 g of antimony trichloride, 10 g of sodium thiosulfate pentahydrate, and 1 g of selenourea into a beaker, then pour in 350 ml of deionized water, ultrasonically treat the solution for 10 min at an ultrasonic power of 30 kHz, and then stir the solution for 20 min at a rotation speed of 500 r / min to obtain a precursor solution; (2) Put the stirred solution in step (1) into an oven to dry at a temperature of 90 °C for 36 h to obtain a precipitate; (3) Transfer the dried precipitate in step (2) into a quartz crucible, place it in a high-temperature furnace, calcine it at 300 °C under the protection of an inert atmosphere of argon, with a heating rate of 5 °C / min and a holding time of 6 h, and after natural cooling, obtain a cathode material with Sb2(S x Se 1-x )3 coated on lithium cobalt oxide.

[0032] The XRD, SEM, and element distribution maps of the cathode material prepared in this example are shown in Figure 3 As can be seen from the figure, the element distribution is uniform, and antimony chalcogenide is successfully coated on the surface of lithium cobalt oxide. The XRD results show that the antimony chalcogenide is an alloy phase composed of Sb2S3 and Sb2Se3.

[0033] Example 2 This example provides a method for preparing a cathode material with antimony chalcogenide coated on lithium cobalt oxide, which specifically includes the following steps: (1) Add 98 g of commercial lithium cobalt oxide powder, 20 g of antimony trichloride, 15 g of thiourea, and 1 g of selenourea into a beaker, then pour in 350 ml of deionized water, ultrasonically treat the solution for 10 min at an ultrasonic power of 30 kHz, and then stir the solution for 20 min at a rotation speed of 500 r / min to obtain a precursor solution; (2) Put the stirred solution in step (1) into an oven to dry at a temperature of 90 °C for 36 h to obtain a precipitate; (3) Transfer the dried precipitate in step (2) into a quartz crucible, place it in a high-temperature furnace, calcine it at 300 °C under the protection of an inert atmosphere of argon, with a heating rate of 5 °C / min and a holding time of 6 h, and after natural cooling, obtain a cathode material with Sb2(S x Se 1-x )3 coated on lithium cobalt oxide.

[0034] Example 3 This example provides a method for preparing a cathode material with antimony chalcogenide coated on lithium cobalt oxide, which specifically includes the following steps: (1) Add 98 g of commercial lithium cobalt oxide powder, 20 g of antimony trichloride, 10 g of thioacetamide, and 0.5 g of selenourea into a beaker, then pour in 350 ml of deionized water, ultrasonically treat the solution at an ultrasonic power of 30 kHz for 10 min, and then stir the solution for 20 min at a rotation speed of 500 r / min to obtain a precursor solution; (2) Place the stirred solution in step (1) in a drying oven to dry at a temperature of 90 °C for 36 h to obtain a precipitate; (3) Transfer the dried precipitate in step (2) into a quartz crucible, place it in a high-temperature furnace, and calcine it at 300 °C under the protection of an inert atmosphere of argon, with a heating rate of 5 °C / min and a holding time of 6 h. After natural cooling, obtain a cathode material with Sb2(S x Se 1-x )3 coated on lithium cobalt oxide.

[0035] Example 4 This example provides a method for preparing an antimony chalcogenide-coated lithium cobalt oxide cathode material, which specifically includes the following steps: (1) Add 98 g of commercial lithium cobalt oxide powder, 20 g of antimony trichloride, 10 g of thioacetamide, and 0.5 g of selenium powder into a beaker, then pour in 350 ml of deionized water, ultrasonically treat the solution at an ultrasonic power of 30 kHz for 10 min, and then stir the solution for 20 min at a rotation speed of 500 r / min to obtain a precursor solution; (2) Place the stirred solution in step (1) in a drying oven to dry at a temperature of 90 °C for 36 h to obtain a precipitate; (3) Transfer the dried precipitate in step (2) into a quartz crucible, place it in a high-temperature furnace, and calcine it at 500 °C under the protection of an inert atmosphere of argon, with a heating rate of 5 °C / min and a holding time of 8 h. After natural cooling, obtain a cathode material with Sb2(S x Se 1-x )3 coated on lithium cobalt oxide.

[0036] Example 5 This example provides a method for preparing an antimony chalcogenide-coated lithium cobalt oxide cathode material, which specifically includes the following steps: (1) Add 98 g of commercial lithium cobalt oxide powder, 20 g of potassium antimonyl tartrate, 10 g of thioacetamide, and 0.5 g of selenourea into a beaker, then pour in 350 ml of deionized water, ultrasonically treat the solution at an ultrasonic power of 30 kHz for 30 min, and then stir the solution for 60 min at a rotation speed of 500 r / min to obtain a precursor solution; (2) Place the stirred solution in step (1) in a drying oven to dry at a temperature of 90 °C for 36 h to obtain a precipitate; (3) Transfer the dried precipitate in step (2) into a quartz crucible, place it in a high-temperature furnace, and calcine it at 500 °C under the protection of an inert argon atmosphere. The heating rate is 7 °C / min, the holding time is 10 h, and after natural cooling, the cathode material coated with Sb2(S x Se 1-x )3 on lithium cobaltate is obtained.

[0037] Comparative Example 1 This comparative example is compared with Example 1. The difference is that in step (1), antimony trichloride, sodium thiosulfate pentahydrate, and selenourea are not added, and the rest of the process is exactly the same as that of Example 1.

[0038] Comparative Example 2 This comparative example is compared with Example 1. The difference is that in step (3), the calcination temperature is set to 400 °C and the heating rate is 10 °C / min, and the rest of the process is exactly the same as that of Example 1.

[0039] Comparative Example 3 This comparative example is compared with Example 5. The difference is that in step (1), selenourea is not added, and the rest of the process is exactly the same as that of Example 5.

[0040] The XRD, SEM, and element distribution maps of the cathode material prepared in this comparative example are shown in Figure 4 , and it can be seen from the figure that the element distribution is uniform, and antimony chalcogenide is successfully coated on the surface of lithium cobaltate. The XRD results show that the antimony chalcogenide is Sb2S3.

[0041] Comparative Example 4 This comparative example is compared with Example 5. The difference is that in step (1), thioacetamide is not added and the mass of selenourea added is 2 g, and the rest of the process is exactly the same as that of Example 5.

[0042] The XRD, SEM, and element distribution maps of the cathode material prepared in this comparative example are shown in Figure 5 , and it can be seen from the figure that the element distribution is uniform, and antimony chalcogenide is successfully coated on the surface of lithium cobaltate. The XRD results show that the antimony chalcogenide is Sb2Se3.

[0043] Performance Test The lithium cobaltate cathode materials prepared in Examples 1-5 and Comparative Examples 1-4 were respectively 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 a speed of 700 r / min for 2 h to prepare a cathode slurry. The cathode slurry was evenly coated on a current collector aluminum foil and placed in an oven at 80 °C for 3 h to obtain a cathode electrode sheet. Using a glass fiber as the separator and a lithium metal sheet as the anode, a 1 M LiPF6 propylene carbonate solution was used as the electrolyte, and a coin cell was assembled in a glove box in the order of anode electrode sheet, electrolyte, separator, electrolyte, and cathode electrode sheet.

[0044] At room temperature, the assembled battery was tested for its electrical performance using a LAND testing system. The voltage range for the test was 3.0 - 4.6 V, and the first cycle was charged and discharged at a 1C rate to obtain the discharge specific capacity at the 1C rate. The first cycle charge-discharge test results of Example 1 and Comparative Example 1 are shown in Figure 6 As shown, the first cycle discharge specific capacity of Example 1 was 200.94 mAh / g, and the first cycle discharge specific capacity of Comparative Example 1 was 196.58 mAh / g. The first cycle discharge specific capacities of other cathode materials are shown in Table 1.

[0045] Then, charging and discharging were continuously carried out at a 1C rate for a total of 50 cycles, and the cycle capacity retention rate of the battery after 50 cycles was tested. The test results are shown in Table 1. Figure 7 The cycling performance of the cathode materials of Example 1 and Comparative Example 1 in the present invention at a 1C rate from 0 to 50 cycles is shown in the figure. It can be seen that the cycling performance of Example 1 is significantly improved compared to that of Comparative Example 1.

[0046] As can be seen from Table 1, the antimony chalcogenide-coated lithium cobaltate cathode material prepared by the method of the present invention has excellent performance in terms of the first cycle discharge specific capacity, the discharge specific capacity after 50 cycles, and the cycle capacity retention rate under high voltage (3.0 - 4.6 V) conditions. Its comprehensive performance is superior to that of pure lithium cobaltate materials. It can be seen that the antimony chalcogenide-coated lithium cobaltate cathode material prepared by the present invention can significantly improve the electrochemical performance of the lithium ion battery cathode material at high voltage.

[0047] Table 1 Performance data of each cathode material The foregoing description of the specific exemplary embodiments of the present invention is for purposes of illustration and exemplification. These descriptions are not intended to limit the invention to the precise forms disclosed, and it is apparent that many modifications and variations are possible in light of the above teachings. The purpose of selecting and describing the exemplary embodiments is to explain the specific principles of the invention and its practical applications, so that those skilled in the art can implement and utilize the various different exemplary embodiments of the invention, as well as various different selections and modifications. The scope of the present invention is intended to be defined by the claims and their equivalents.

Claims

1. A preparation method of an antimony chalcogenide-coated lithium cobalt oxide cathode material, characterized in that, It includes the following steps: (1) Mix lithium cobalt oxide powder with antimony-containing compounds, sulfur-containing compounds, and selenium-containing compounds in deionized water, perform ultrasonic treatment and then stir for a certain period of time to form a uniformly dispersed precursor solution; the molar ratio of the lithium cobalt oxide powder to the antimony-containing compounds, sulfur-containing compounds, and selenium-containing compounds is 1:(0.01~1):(0.01~3):(0.001~2); (2) Dry the precursor solution obtained in step (1) to obtain a solid powder; (3) Calcinate the solid powder obtained in step (2) at 100~500 °C under a protective atmosphere to finally obtain a lithium cobalt oxide cathode material coated with antimony chalcogenide.

2. The preparation method of the lithium cobalt oxide cathode material coated with antimony chalcogenide according to claim 1, wherein, The antimony-containing compound is one or more of antimony trichloride, antimony acetate, potassium antimonyl tartrate, antimony trifluoride, antimony triiodide, and antimony sulfate.

3. The preparation method of the lithium cobalt oxide cathode material coated with antimony chalcogenide according to claim 1, wherein, The sulfur-containing compound is one or more of thiourea, thioacetamide, sodium thiosulfate pentahydrate, sodium sulfite, cysteine, sulfur powder, and selenium disulfide.

4. The preparation method of the lithium cobalt oxide cathode material coated with antimony chalcogenide according to claim 1, characterized in that, 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.

5. The preparation method of the lithium cobalt oxide cathode material coated with antimony chalcogenide according to claim 1, wherein 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.

6. The preparation method of the lithium cobalt oxide cathode material coated with antimony chalcogenide according to claim 1, characterized in that, In step (2), the drying temperature is 70~90 °C, and the drying time is 12~48 h.

7. The preparation method of the antimony chalcogenide-coated lithium cobalt oxide cathode material according to claim 1, wherein In step (3), the heating rate is 1~10 °C / min, and the holding time is 1~10 h.

8. The preparation method of the lithium cobalt oxide cathode material coated with antimony chalcogenide according to claim 1, wherein The molar ratio of the lithium cobalt oxide powder to the antimony-containing compounds, sulfur-containing compounds, and selenium-containing compounds is 1:(0.05~0.1):(0.03~0.22):(0.003~0.01).

9. A lithium cobalt oxide cathode material coated with antimony chalcogenide, characterized in that, The cathode material is prepared by the preparation method according to any one of claims 1~8.

10. Use of the antimony chalcogenide-coated lithium cobalt oxide cathode material according to claim 9 in the preparation of lithium batteries.

Images