Large-size lithium cobalt oxide ceramic target material and preparation method thereof

Abstract

The invention relates to a large-size lithium cobalt oxide ceramic target material and a preparation method thereof, and the preparation method comprises the following steps: (1) mixing a binder, a dispersant, a solvent and lithium cobalt oxide, and carrying out spray drying to obtain a mixture; (2) loading the mixture into a mold, and carrying out cold isostatic pressing to obtain a lithium cobalt oxide green body; and (3) degreasing the lithium cobalt oxide green body, and then carrying out hot isostatic pressing to obtain the large-size lithium cobalt oxide ceramic target material, and the size of the ceramic target material is as follows: the length is (800mm-1000mm) * the width is (300mm-500mm). The large-size lithium cobalt oxide ceramic target material is prepared through cold isostatic pressing and hot isostatic pressing, the preparation process is simple, the efficiency is high, the cost is low, the preparation period is short, and mass production is easy; the prepared large-size lithium cobalt oxide ceramic target material is good in uniformity and high in density.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium cobalt oxide materials, in particular to a lithium cobalt oxide ceramic target material and a preparation method thereof, and in particular to a large-size lithium cobalt oxide ceramic target material and a preparation method thereof. Background Art

[0002] The emergence of batteries has reduced people's dependence on non-renewable resources. With the rapid development of the electronics industry, electronic products are developing towards miniaturization, lightness, and portability, which puts forward new requirements for batteries. Lithium-ion solid-state batteries with greater energy density, longer cycle life, and higher operating voltage have attracted great attention. Compared with liquid lithium-ion batteries, all-solid-state batteries have higher safety, greater energy density, and a wider range of operating temperatures, and have now become the latest field of lithium-ion battery development.

[0003] The earliest positive electrode material for thin-film batteries was TiS2. With the successful development of high-performance solid electrolyte LiPON, lithium cobalt oxide has also attracted extensive research as a positive electrode material for LiPON solid-state thin-film batteries. Lithium cobalt oxide is currently the mainstream positive electrode material for lithium-ion batteries due to its high voltage, high specific energy density, good cycle performance, and simple process preparation. With the development of thin-film solid-state batteries, higher requirements are also placed on lithium cobalt oxide targets for positive electrode materials of magnetron sputtering all-solid-state thin-film batteries.

[0004] The lithium cobalt oxide ceramic target prepared in the prior art is relatively small in size. Therefore, how to prepare a large-sized lithium cobalt oxide ceramic target with good uniformity and high density has become a problem that needs to be solved urgently. Summary of the invention

[0005] In order to solve the above technical problems, the present invention provides a large-size lithium cobalt oxide ceramic target and a preparation method thereof. The large-size lithium cobalt oxide ceramic target is prepared by cold isostatic pressing and hot isostatic pressing processes. The preparation process is simple, efficient, low-cost, short production cycle, and easy to mass produce; the prepared large-size lithium cobalt oxide ceramic target has good uniformity and high density.

[0006] To achieve this object, the present invention adopts the following technical solutions:

[0007] In a first aspect, the present invention provides a method for preparing a large-sized lithium cobalt oxide ceramic target, the preparation method comprising the following steps: (1) mixing a binder, a dispersant, a solvent and lithium cobalt oxide, spray drying and obtaining a mixture; (2) loading the mixture into a mold, performing cold isostatic pressing and obtaining a lithium cobalt oxide green body; (3) degreasing the lithium cobalt oxide green body, and then performing hot isostatic pressing and obtaining the large-sized lithium cobalt oxide ceramic target; the size of the ceramic target is length (800mm-1000mm) × width (300mm-500mm).

[0008] The present invention prepares large-sized lithium cobalt oxide ceramic targets by cold isostatic pressing and hot isostatic pressing, and the preparation process is simple, efficient, low-cost, short production cycle, and easy to mass produce; the prepared large-sized lithium cobalt oxide ceramic targets have good uniformity and high density.

[0009] Preferably, the binder in step (1) comprises polyvinyl alcohol.

[0010] Preferably, the amount of the binder is 2wt%-5wt% of the total amount of the binder, dispersant and lithium cobalt oxide, for example, it can be 2wt%, 2.5wt%, 3wt%, 4wt%, 4.5wt% or 5wt%, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0011] The present invention can further improve the purity and density of the target material by further adjusting the amount of the binder. Within the preferred range of the amount of the binder, the prepared lithium cobalt oxide ceramic target material has high purity and high density.

[0012] Preferably, the dispersant includes any one of polyacrylic acid, polyacrylamide, sodium hexametaphosphate or sodium acrylate, or a combination of at least two of them. Typical but non-limiting combinations include a combination of polyacrylic acid and polyacrylamide, a combination of sodium hexametaphosphate and sodium acrylate, or a combination of polyacrylamide, sodium hexametaphosphate and sodium acrylate.

[0013] Preferably, the amount of the dispersant used accounts for 0.5wt%-3wt% of the total amount of the binder, dispersant and lithium cobalt oxide, for example, it can be 0.5wt%, 1wt%, 1.5wt%, 2wt%, 2.5wt% or 3wt%, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0014] Preferably, the solvent comprises water.

[0015] Preferably, the mixing in step (1) includes three-stage mixing.

[0016] Preferably, the one-stage mixing includes: a one-stage mixing of a solvent and a dispersant to obtain a one-stage mixed material.

[0017] Preferably, the mixing time is 0.5h-3h, for example, 0.5h, 1h, 1.5h, 2h, 2.5h or 3h, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0018] Preferably, the two-stage mixing comprises: mixing the first-stage mixture and lithium cobalt oxide powder in two stages to obtain the second-stage mixture.

[0019] Preferably, the time of the second-stage mixing is 6h-24h, for example, 6h, 10h, 14h, 18h, 22h or 24h, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0020] Preferably, the three-stage mixing includes: three-stage mixing of the second-stage mixture and a binder to obtain a mixed liquid slurry.

[0021] Preferably, the three-stage mixing time is 6h-24h, for example, it can be 6h, 10h, 14h, 18h, 22h or 24h, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0022] Preferably, after the spray drying in step (1), a spherical mixture is obtained.

[0023] Preferably, the particle size D50 of the spherical mixture is 30 μm-150 μm, for example, 30 μm, 50 μm, 70 μm, 100 μm, 120 μm or 150 μm, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0024] The present invention can further improve the purity and density of the target material by further regulating the particle size of the spherical mixture. Within the preferred range of the particle size of the spherical mixture, the prepared lithium cobalt oxide ceramic target material has high purity and high density.

[0025] Preferably, the mold in step (2) comprises a rubber mold.

[0026] Preferably, the pressure of the cold isostatic pressing in step (2) is 200 MPa-250 MPa, for example, 200 MPa, 210 MPa, 220 MPa, 230 MPa, 240 MPa or 250 MPa, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0027] Preferably, the holding time of the cold isostatic pressing in step (2) is 10 min-40 min, for example, 10 min, 20 min, 30 min, 35 min or 40 min, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0028] The present invention can further improve the purity and density of the target material by further regulating the pressure and holding time of cold isostatic pressing while ensuring the integrity of the target material. Within the preferred range of cold isostatic pressing pressure and holding time, the prepared lithium cobalt oxide ceramic target material has high purity and high density, and the integrity and uniformity of the target material can be ensured.

[0029] Preferably, the degreasing holding temperature in step (3) is 500°C-600°C, for example, it can be 500°C, 520°C, 540°C, 560°C, 580°C or 600°C, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0030] Preferably, the degreasing holding time in step (3) is 1 h-5 h, for example, 1 h, 1.5 h, 2 h, 3 h, 4 h or 5 h, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0031] The present invention can further improve the purity of the target material by further regulating the degreasing temperature and time. At the preferred degreasing insulation temperature and insulation time, the purity of the prepared target material is further improved.

[0032] Preferably, the degreasing device in step (3) comprises a lifting furnace.

[0033] Preferably, the hot isostatic pressing mold in step (3) comprises a stainless steel jacket.

[0034] Preferably, the pressure of the hot isostatic pressing in step (3) is 150 MPa-200 MPa, for example, 150 MPa, 160 MPa, 170 MPa, 180 MPa, 190 MPa or 200 MPa, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0035] Preferably, the sintering temperature of the hot isostatic pressing in step (3) is 900°C-1200°C, for example, it can be 900°C, 950°C, 1000°C, 1050°C, 1100°C or 1200°C, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0036] Preferably, the heat preservation and pressure holding time of the hot isostatic pressing in step (3) is 1h-5h, for example, it can be 1h, 1.5h, 2h, 3h, 4h or 5h, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0037] The present invention can further improve the purity and density of the target material by further regulating the sintering temperature and heat preservation and pressure holding time of hot isostatic pressing while ensuring the integrity of the target material. Within the preferred range of hot isostatic pressing sintering temperature and heat preservation and pressure holding time, the prepared lithium cobalt oxide ceramic target material has high purity and high density, and the integrity and uniformity of the target material can be ensured.

[0038] As a preferred technical solution of the present invention, the preparation method comprises the following steps:

[0039] (1) adding a solvent and a dispersant, and mixing for 0.5 h to 3 h in the first stage; then adding lithium cobalt oxide powder, and mixing for 6 h to 24 h in the second stage; and finally adding a binder, and mixing for 6 h to 24 h in the third stage to obtain a mixed liquid slurry.

[0040] (2) The mixed liquid slurry is passed into a spray granulation device for drying to obtain a spherical mixture, wherein the particle size D50 of the spherical mixture is 30 μm-150 μm.

[0041] (3) The spherical mixture is loaded into a mold with dimensions of length (800 mm-1000 mm) × width (300 mm-500 mm), placed in a cold isostatic pressing device, the pressure is adjusted to 200 MPa-250 MPa, and the pressure is maintained for 10 min-40 min to obtain a lithium cobalt oxide green body.

[0042] (4) Degreasing the lithium cobalt oxide green body at 500° C.-600° C. for 1 h-5 h to obtain a degreased lithium cobalt oxide green body.

[0043] (5) placing the degreased lithium cobalt oxide green body into a hot isostatic pressing mold, adjusting the pressure to 150 MPa-200 MPa, the sintering temperature to 900° C.-1200° C., and the holding time to 1 h-5 h to obtain the large-sized lithium cobalt oxide ceramic target.

[0044] In a second aspect, the present invention provides a large-sized lithium cobalt oxide ceramic target, which is prepared according to the preparation method described in the first aspect.

[0045] Preferably, the length of the lithium cobalt oxide ceramic target is 800 mm-1000 mm, for example, 800 mm, 850 mm, 900 mm, 950 mm or 1000 mm, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0046] Preferably, the width of the lithium cobalt oxide ceramic target is 300 mm-500 mm, for example, 300 mm, 350 mm, 400 mm, 450 mm or 500 mm, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0047] Preferably, the thickness of the lithium cobalt oxide ceramic target is 10 mm-20 mm, for example, 10 mm, 12 mm, 14 mm, 16 mm, 18 mm or 20 mm, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0048] Compared with the prior art, the present invention has at least the following beneficial effects:

[0049] The present invention prepares large-sized lithium cobalt oxide ceramic targets by cold isostatic pressing and hot isostatic pressing, and the preparation process is simple, efficient, low-cost, short production cycle, and easy to mass produce; the prepared large-sized lithium cobalt oxide ceramic targets have good uniformity and high density. DETAILED DESCRIPTION

[0050] For the convenience of understanding the present invention, the present invention lists the following embodiments. It should be understood by those skilled in the art that the embodiments are only to help understand the present invention and should not be regarded as specific limitations of the present invention.

[0051] Example 1

[0052] This embodiment provides a method for preparing a large-size lithium cobalt oxide ceramic target, and the preparation method comprises the following steps:

[0053] (1) Add 2 parts of polyacrylic acid and 200 parts of water into a powder mixing barrel and mix for 2 hours in the first stage; then add 95 parts of lithium cobalt oxide powder and mix for 12 hours in the second stage; finally add 3 parts of polyvinyl alcohol solution as a solute and mix for 12 hours in the third stage to obtain a mixed liquid slurry;

[0054] (2) passing the mixed liquid slurry into a spray granulation device for drying to prepare a spherical mixed material with a D50 of 80 μm;

[0055] (3) The spherical mixture is loaded into a rubber mold with a size of 1000 mm×500 mm, and placed in a cold isostatic pressing device. The cold isostatic pressing pressure is 230 MPa, and the cold isostatic pressing pressure is maintained for 30 minutes to obtain a lithium cobalt oxide green body;

[0056] (4) placing the lithium cobalt oxide green body into a lifting furnace for degreasing at a degreasing temperature of 550° C. for a degreasing time of 3 h to obtain a degreasing lithium cobalt oxide green body;

[0057] (5) The degreased lithium cobalt oxide ceramic green body is placed in a stainless steel sheath, sealed and welded, and placed in a hot isostatic pressing device. The hot isostatic pressing pressure is 180 MPa, the hot isostatic pressing sintering temperature is 1000° C., and the hot isostatic pressing holding time is 3 hours to obtain the large-sized lithium cobalt oxide ceramic target.

[0058] Example 2

[0059] This embodiment provides a method for preparing a large-size lithium cobalt oxide ceramic target, and the preparation method comprises the following steps:

[0060] (1) adding 0.5 parts of polyacrylic acid and 200 parts of water to the mixed powder, mixing for 0.5 hours in the first stage; then adding 97.5 parts of lithium cobalt oxide powder, mixing for 6 hours in the second stage; adding 2 parts of polyvinyl alcohol solution as the solute, mixing for 6 hours in the third stage, and obtaining a mixed liquid slurry;

[0061] (2) passing the mixed liquid slurry into a spray granulation device for drying to prepare a spherical mixed material with a D50 of 30 μm;

[0062] (3) The spherical mixture is loaded into a rubber mold with a size of 800 mm×300 mm, and placed in a cold isostatic pressing device. The cold isostatic pressing pressure is 200 MPa, and the cold isostatic pressing pressure is maintained for 40 minutes to obtain a lithium cobalt oxide green body;

[0063] (4) placing the lithium cobalt oxide green body into a lifting furnace for degreasing at a degreasing temperature of 500° C. for a degreasing time of 5 h to obtain a degreasing lithium cobalt oxide green body;

[0064] (5) The degreased lithium cobalt oxide ceramic green body is placed in a stainless steel sheath, sealed and welded, and placed in a hot isostatic pressing device. The hot isostatic pressing pressure is 150 MPa, the hot isostatic pressing sintering temperature is 900° C., and the hot isostatic pressing holding time is 5 h to obtain the large-sized lithium cobalt oxide ceramic target.

[0065] Example 3

[0066] This embodiment provides a method for preparing a large-size lithium cobalt oxide ceramic target, and the preparation method comprises the following steps:

[0067] (1) adding 3 parts of polyacrylamide and 200 parts of water to the mixed powder, mixing for 3 hours in the first stage; then adding 92 parts of lithium cobalt oxide powder, mixing for 24 hours in the second stage; adding 5 parts of polyvinyl alcohol solution as a solute, mixing for 24 hours in the third stage, and obtaining a mixed liquid slurry;

[0068] (2) passing the mixed liquid slurry into a spray granulation device for drying to prepare a spherical mixed material with a D50 of 150 μm;

[0069] (3) The spherical mixture is loaded into a rubber mold with a size of 800 mm×500 mm, and placed in a cold isostatic pressing device. The cold isostatic pressing pressure is 250 MPa, and the cold isostatic pressing pressure is maintained for 10 minutes to obtain a lithium cobalt oxide green body;

[0070] (4) placing the lithium cobalt oxide green body into a lifting furnace for degreasing at a degreasing temperature of 600° C. for a degreasing time of 1 h to obtain a degreased lithium cobalt oxide green body;

[0071] (5) The degreased lithium cobalt oxide ceramic green body is placed in a stainless steel sheath, sealed and welded, and placed in a hot isostatic pressing device. The hot isostatic pressing pressure is 200 MPa, the hot isostatic pressing sintering temperature is 1200° C., and the hot isostatic pressing holding time is 1 hour to obtain the large-sized lithium cobalt oxide ceramic target.

[0072] Example 4

[0073] The only difference between this embodiment and embodiment 1 is that, except that the pressure of the cold isostatic pressing in step (3) is 180 MPa, the rest is the same as embodiment 1.

[0074] Example 5

[0075] The only difference between this embodiment and embodiment 1 is that, except for the holding time of the cold isostatic pressing in step (3) being 45 minutes, the rest is the same as embodiment 1.

[0076] Example 6

[0077] The only difference between this embodiment and embodiment 1 is that, except for the degreasing temperature of step (4) being 450° C., the rest is the same as embodiment 1.

[0078] Example 7

[0079] The only difference between this embodiment and embodiment 1 is that, except for the degreasing time in step (4) being 0.5 h, the rest is the same as embodiment 1.

[0080] Example 8

[0081] The only difference between this embodiment and embodiment 1 is that, except that the pressure of hot isostatic pressing in step (3) is 130 MPa, the rest is the same as embodiment 1.

[0082] Example 9

[0083] The only difference between this embodiment and embodiment 1 is that, except for the sintering temperature of hot isostatic pressing in step (3) being 850° C., the rest is the same as embodiment 1.

[0084] Example 10

[0085] The only difference between this embodiment and embodiment 1 is that, except that the holding time of hot isostatic pressing in step (3) is 0.5 h, the rest is the same as embodiment 1.

[0086] Comparative Example 1

[0087] The difference between this comparative example and Example 1 is that, except for not performing step (3), the rest is the same as Example 1.

[0088] Comparative Example 2

[0089] The difference between this comparative example and Example 1 is that, except that in step (5), the hot isostatic pressing equipment is not put in, and the sintering is directly performed at 1000° C. for 3 h, the rest is the same as Example 1.

[0090] Test Method

[0091] The density of the lithium cobalt oxide ceramic target prepared in Example 1 to Example 10 and Comparative Example 1 to Comparative Example 2 was tested. The test method was: using the AKD-220A density instrument of Yangzhou Aikeruide Instrument Co., Ltd. to test the density of the lithium cobalt oxide ceramic target. The test method was the drainage method, and the test results were recorded in Table 1.

[0092] Table 1

[0093] Density Example 1 98％ Example 2 96.2％ Example 3 93.5％ Example 4 90.8％ Example 5 97.2％ Example 6 94.3％ Example 7 88％ Example 8 86.3％ Example 9 93.7％ Example 10 91.45％ Comparative Example 1 63％ Comparative Example 2 83％

[0094] The test results show that:

[0095] (1) It can be seen from Examples 1 to 10 and Comparative Examples 1 to 2 that the present invention prepares large-sized lithium cobalt oxide ceramic targets through cold isostatic pressing and hot isostatic pressing processes. The preparation process is simple, efficient, low-cost, and has a short production cycle, and is easy for mass production. The prepared large-sized lithium cobalt oxide ceramic targets have good uniformity and high density.

[0096] (2) It can be seen from Example 1 and Example 4-Example 5 that the large-sized lithium cobalt oxide ceramic target prepared by the present invention has a higher density by further regulating the pressure and holding time of the cold isostatic pressure.

[0097] (3) It can be seen from Example 1 and Example 6-Example 7 that the large-sized lithium cobalt oxide ceramic target prepared by the present invention by further regulating the degreasing temperature and time has a higher density.

[0098] (4) It can be seen from Examples 1 and 8 to 10 that the present invention further regulates the pressure, sintering temperature and holding time of the hot isobaric sintering process to prepare a large-sized lithium cobalt oxide ceramic target with higher density.

[0099] In summary, the present invention prepares large-sized lithium cobalt oxide ceramic targets through cold isostatic pressing and hot isostatic pressing processes. The preparation process is simple, efficient, low-cost, short production cycle, and easy to mass produce; the prepared large-sized lithium cobalt oxide ceramic targets have good uniformity and high density.

[0100] The applicant declares that the above is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention shall fall within the protection scope and disclosure scope of the present invention.

Claims

1. A method for preparing a large-size lithium cobalt oxide ceramic target, characterized in that: The preparation method comprises the following steps: (1) mixing a binder, a dispersant, a solvent and lithium cobalt oxide, and spray drying to obtain a mixture; (2) placing the mixed material into a mold and performing cold isostatic pressing to obtain a lithium cobalt oxide green body; (3) degreasing the lithium cobalt oxide green body and then performing hot isostatic pressing to obtain the large-size lithium cobalt oxide ceramic target; The size of the ceramic target is length (800mm-1000mm)×width (300mm-500mm).

2. The preparation method according to claim 1, characterized in that: The binder in step (1) comprises polyvinyl alcohol; Preferably, the amount of the binder is 2wt%-5wt% of the total amount of the binder, the dispersant and the lithium cobalt oxide; Preferably, the dispersant includes any one or a combination of at least two of polyacrylic acid, polyacrylamide, sodium hexametaphosphate or sodium acrylate; Preferably, the amount of the dispersant is 0.5wt%-3wt% of the total amount of the binder, the dispersant and the lithium cobalt oxide; Preferably, the solvent comprises water.

3. The preparation method according to claim 1 or 2, characterized in that: The mixing in step (1) includes three stages of mixing; Preferably, the one-stage mixing includes: a one-stage mixing of a solvent and a dispersant to obtain a one-stage mixed material; Preferably, the mixing time is 0.5h-3h; Preferably, the two-stage mixing comprises: mixing the first-stage mixture and lithium cobalt oxide powder in two stages to obtain a second-stage mixture; Preferably, the second-stage mixing time is 6h-24h; Preferably, the three-stage mixing includes: three-stage mixing of the second-stage mixture and the binder to obtain a mixed liquid slurry; Preferably, the three-stage mixing time is 6h-24h.

4. The preparation method according to any one of claims 1 to 3, characterized in that After the spray drying in step (1), a spherical mixture is obtained; Preferably, the particle size D50 of the spherical mixture is 30 μm-150 μm.

5. The preparation method according to any one of claims 1 to 4, characterized in that: The mold in step (2) comprises a rubber mold; Preferably, the pressure of the cold isostatic pressing in step (2) is 200 MPa-250 MPa; Preferably, the holding time of the cold isostatic pressing in step (2) is 10 min-40 min.

6. The preparation method according to any one of claims 1 to 5, characterized in that: The degreasing holding temperature in step (3) is 500° C.-600° C.; Preferably, the degreasing holding time in step (3) is 1 h to 5 h.

7. The preparation method according to any one of claims 1 to 6, characterized in that: The hot isostatic pressing mold in step (3) includes a stainless steel sleeve; Preferably, the pressure of the hot isostatic pressing in step (3) is 150MPa-200MPa; Preferably, the sintering temperature of the hot isostatic pressing in step (3) is 900° C.-1200° C.; Preferably, the heat preservation and pressure holding time of the hot isostatic pressing in step (3) is 1h-5h.

8. The preparation method according to claim 1, characterized in that: The preparation method comprises the following steps: (1) adding a solvent and a dispersant, and mixing for 0.5 h to 3 h in the first stage; then adding lithium cobalt oxide powder, and mixing for 6 h to 24 h in the second stage; finally adding a binder, and mixing for 6 h to 24 h in the third stage to obtain a mixed liquid slurry; (2) passing the mixed liquid slurry into a spray granulation device for drying to obtain a spherical mixed material; (3) The spherical mixture is loaded into a mold with a size of length (800 mm-1000 mm) × width (300 mm-500 mm), and placed in a cold isostatic pressing device, the pressure is adjusted to 200 MPa-250 MPa, and the pressure is maintained for 10 min-40 min to obtain a lithium cobalt oxide green body; (4) degreasing the lithium cobalt oxide green body at 500° C.-600° C. for 1 h-5 h to obtain a degreased lithium cobalt oxide green body; (5) placing the degreased lithium cobalt oxide green body into a hot isostatic pressing mold, adjusting the pressure to 150 MPa-200 MPa, the sintering temperature to 900° C.-1200° C., and the holding time to 1 h-5 h to obtain the large-sized lithium cobalt oxide ceramic target.

9. A large-sized lithium cobalt oxide ceramic target, characterized in that: The lithium cobalt oxide ceramic target is prepared according to the preparation method according to any one of claims 1-8.

10. The lithium cobalt oxide ceramic target according to claim 9, characterized in that: The length of the lithium cobalt oxide ceramic target is 800mm-1000mm; Preferably, the width of the lithium cobalt oxide ceramic target is 300 mm-500 mm.