A preparation method and application of solid-state battery composite electrode

Abstract

The present invention discloses a method for preparing a straight-pore ceramic composite electrode, comprising the following steps: (1) mixing a positive electrode material, an electrolyte ceramic powder, and a polyethersulfone-N-methylpyrrolidone solution and grinding the mixture to obtain a mixed slurry. (2) placing the mixed slurry in a mold, then covering it with a mesh carrier and injecting water to perform a phase inversion reaction. After completion, the mixture is dried to obtain an embryonic body having a straight-pore structure inside. (3) heating the embryonic body to remove binder and then sintering the embryonic body to obtain the straight-pore ceramic composite electrode. The present invention utilizes a phase inversion method and a high-temperature sintering method to prepare a straight-pore ceramic composite electrode having a straight-pore structure. The electrode has a straight-pore structure and can effectively alleviate the volume effect during the charge and discharge process. The dense surface layer after sintering can effectively prevent the growth of lithium dendrites under high current, thereby significantly improving the current density and cycle stability of the solid-state battery.

Description

Technical Field

[0001] The present invention relates to the technical field of battery positive electrode material preparation, and in particular to a method for preparing a straight-pore ceramic composite electrode and its application. Background Art

[0002] The information disclosed in the background of the invention is only intended to enhance understanding of the overall background of the invention and should not necessarily be regarded as an admission or any form of suggestion that the information constitutes the prior art already known to a person skilled in the art.

[0003] Faced with a global energy crisis, the development of advanced energy storage devices that are clean, efficient, safe, and cost-effective is essential. Among various energy storage devices, lithium-ion batteries offer high capacity and mass density, making them widely used in mobile phones, electric vehicles, and other applications. However, traditional liquid lithium batteries face significant safety challenges. Their use of liquid organic electrolytes can lead to the formation of lithium dendrites during charging, which can pierce the separator and cause fires.

[0004] The electrochemical window of solid electrolytes is higher than that of organic electrolytes, which can increase the battery voltage operating range, have high power density and high safety, and are the future development direction of batteries. All-solid-state lithium batteries can be divided into low-load thin-film type and high-load bulk all-solid-state lithium batteries according to the loading of electrode materials. The complex preparation process and low loading of electrode materials of thin-film all-solid-state lithium batteries limit their large-scale application. Bulk all-solid-state batteries have high energy density, good safety, and relatively low preparation process costs, which can meet the performance requirements of new energy power vehicles and other fields. However, with the increase in active material loading and the increase in electrode layer thickness, the interfacial contact impedance between particles is larger, and the dendrites grow more rapidly, resulting in poor cycle stability of bulk batteries. In addition, during the charge and discharge process, due to the certain volume deformation of the electrode material, the thick electrode layer will amplify the volume deformation, resulting in microcracks inside the thick electrode, affecting the performance of the all-solid-state lithium battery. Summary of the Invention

[0005] To address the issues with current bulk solid-state batteries, such as the volume effect of charge and discharge causing microcracks and the increased growth of lithium dendrites under high loads, which affects cycling stability, the present invention proposes a method for preparing and applying a straight-pore ceramic composite electrode. This method utilizes a phase transformation method combined with high-temperature sintering to produce a ceramic composite electrode with a straight-pore structure. This method effectively prevents the growth of lithium dendrites under high loads, significantly improving the current density and cycling stability of solid-state batteries. To achieve these objectives, the technical solutions of the present invention are as follows:

[0006] In a first aspect of the present invention, a method for preparing a straight-pore ceramic composite electrode is disclosed, comprising:

[0007] (1) The positive electrode material, electrolyte ceramic powder, and polyethersulfone-N-methylpyrrolidone solution are mixed and then ground to obtain a mixed slurry.

[0008] (2) The mixed slurry is placed in a mold, and then covered with a mesh carrier and water is injected to perform a phase inversion reaction. After completion, the mold is dried to obtain an embryonic body with a straight pore structure inside.

[0009] (3) The embryo body is heated to remove binder and then sintered to obtain the straight-pore ceramic composite electrode.

[0010] Furthermore, in step (1), the ratio of the positive electrode material, electrolyte ceramic powder, and polyethersulfone-N-methylpyrrolidone solution is 10-35% positive electrode material: 10-35% electrolyte ceramic powder: polyethersulfone-N-methylpyrrolidone solution = 50-80%. In the present invention, the polyethersulfone-N-methylpyrrolidone solution solidifies the ceramic powder, and the N-methylpyrrolidone forms microchannels through convection diffusion with water in the mold.

[0011] Furthermore, the polyethersulfone-N-methylpyrrolidone solution is formed by dissolving polyethersulfone in N-methylpyrrolidone. Optionally, the mass concentration of the polyethersulfone-N-methylpyrrolidone solution is 10-40%. Polyvinylidene fluoride (PVDF), polytetrafluoroethylene (PTFE), etc. can also be used instead of the polyethersulfone.

[0012] In step (1), the positive electrode material includes: LiCO2, LiFePO4, LiNiO2, LiMn2O4, LiMn x Ni y Co 1-x- y Any one of O2, LiMnPO4, LiNiPO4, Li3V2(PO4)3, etc.

[0013] Furthermore, in step (1), the electrolyte ceramic powder includes: LiAlTiPO4, Li 0.34 La 0.56 TiO3, Li5La3Ta2O 12 , Li 6.25 Ga 0.25 La3Zr2O 12 , Li 0.39 La 0.5 Sr 0.06 TiO3, Li 0.33 La 0.46 Y 0.1 TiO3, Li 1.3 Al 0.3 Ti 1.7 Any one of (PO4)3, etc.

[0014] Furthermore, in step (1), the grinding treatment time is 12 to 48 hours, and after grinding, the positive electrode material, electrolyte ceramic powder and polyethersulfone-N-methylpyrrolidone solution can be processed into a uniform and fine mixed slurry.

[0015] Furthermore, in step (2), the mesh carrier includes any one of a wire mesh, a copper mesh, a screen mesh, and a nickel mesh, and its main function is to guide the formation of microchannels so that the diameter of the formed microchannels is uniform and the growth length of the microchannels is consistent.

[0016] Furthermore, in step (2), the drying temperature range is 60-90° C., and the drying time range is 12-24 hours.

[0017] Furthermore, in step (2), the phase inversion reaction time is 2 to 6 hours. In the present invention, the principle of the phase inversion reaction is as follows: in the formation of the ceramic membrane, polyethersulfone is dissolved in an N-methylpyrrolidone solvent, and ceramic powder is dispersed in the solution to form a slurry. During the phase inversion process, polyethersulfone precipitates from the solvent and solidifies the slurry. High-speed convection between the N-methylpyrrolidone solution and water forms microchannels.

[0018] Furthermore, in step (3), the temperature of the heating debinding is 300-500°C and the time is 60-120 minutes. In the present invention, the purpose of the debinding is: during the phase transformation process, a layer of polyethersulfone will adhere to the surface of the ceramic powder. The presence of these substances inhibits the contact sintering of the ceramic powder. The heat preservation at 300-500°C can decompose organic matter, promote the connectivity of the ceramic powder particles in the subsequent sintering process, and promote the sintering of ceramic powder particles into phases.

[0019] Furthermore, in step (3), the sintering temperature is 550-760° C. and the sintering time is 300-500 min. After sintering, the surface of the straight-pore ceramic composite electrode can be formed into a dense surface, thereby preventing lithium branched crystals from penetrating the positive electrode material.

[0020] In a second aspect of the present invention, applications of the straight-pore ceramic composite electrode obtained by the straight-pore ceramic composite electrode preparation method in the fields of mobile phones, electric vehicles, aerospace, etc. are disclosed.

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

[0022] (1) Compared with traditional thin film technology, the loading capacity of the electrode material of the present invention can be greatly increased, which can effectively increase the power per unit volume of the battery.

[0023] (2) The present invention utilizes a process of sintering electrode materials and electrolytes together to prepare a straight-pore ceramic composite electrode with a tightly bonded interface. This tight interface is conducive to the conduction of lithium ions. The straight-pore structure inside the prepared bulk battery can effectively alleviate the volume deformation of the electrode material during the charge and discharge process, thereby improving the cycle stability of the solid-state battery.

[0024] (3) The present invention prepares a blank with a straight pore structure / strip-shaped channels, and then uses a sintering process to obtain a straight pore ceramic composite electrode with straight pores and small pores coexisting inside. Its technical advantages are: by filling gel electrolyte and carbon powder per unit volume, more lithium ion and electron transmission channels can be provided, which can effectively alleviate the volume expansion during the charge and discharge process, reduce the generation of microcracks in the positive electrode, and effectively avoid the growth of lithium dendrites caused by uneven charge distribution under large loads. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0026] Figure 1 This is a scanning electron microscope (SEM) image of a cross section of the straight-pore ceramic composite electrode prepared in Example 1 of the present invention.

[0027] Figure 2 This is the X-ray diffraction pattern (XRD) of the straight-pore ceramic composite electrode prepared in Example 1 of the present invention.

[0028] Figure 3 This is a comparison of the charge and discharge capacity of a solid-state lithium battery with a straight-pore ceramic composite electrode prepared in Example 1 of the present invention and a traditional thin-film battery.

[0029] Figure 4 This is a graph comparing the cycling performance of a solid-state lithium battery with a straight-pore ceramic composite electrode prepared in Example 1 of the present invention and a traditional thin-film battery. DETAILED DESCRIPTION

[0030] The following description further elaborates on the specific details of the present invention for a full understanding of the present invention. The terms used in the description of the present invention are only used to illustrate the advantages and features of the present invention and are not intended to limit the present invention.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meanings as those understood by those skilled in the art within the technical field of the present invention. Unless otherwise specified, the drugs and reagents used herein were used in accordance with the product instructions or in accordance with conventional methods in the art. The process of the present invention is now further described with reference to the accompanying drawings and specific embodiments.

[0032] Example 1

[0033] A method for preparing a straight-pore ceramic composite electrode comprises the following steps:

[0034] (1) Dissolve polyethersulfone in N-methylpyrrolidone to prepare a polyethersulfone-N-methylpyrrolidone solution with a mass concentration of 17.7% for later use.

[0035] (2) Weigh 21 g of LiCO2, 9 g of LiAlTiPO4, and 30 g of the polyethersulfone-N-methylpyrrolidone solution according to the mass ratio, place the above three raw materials in a horizontal planetary mixer and ball mill for 48 hours, then evacuate the mixture with a vacuum stirrer for 20 minutes to remove the gas in the obtained mixed slurry and set aside.

[0036] (3) The slurry was added to a circular mold with a diameter of 4 cm, and then a wire mesh with a pore size of 150 μm was covered on the upper surface of the slurry. Deionized water was then injected into the upper surface of the slurry to perform phase conversion for 4 hours. After completion, the slurry was dried at 70°C for 12 hours to obtain a dry embryo.

[0037] (4) The dried embryo body is placed in a muffle furnace and heated to 400°C at a rate of 10°C / min, and then kept at this temperature for 120 minutes for debinding. After completion, the muffle furnace is further heated to 760°C at a rate of 2°C / min and kept at this temperature for 300 minutes to perform high-temperature sintering on the dried embryo body. After completion, the muffle furnace is allowed to cool naturally to obtain a straight-hole ceramic composite electrode.

[0038] Example 2

[0039] A method for preparing a straight-pore ceramic composite electrode comprises the following steps:

[0040] (1) Dissolve polyethersulfone in N-methylpyrrolidone to prepare a polyethersulfone-N-methylpyrrolidone solution with a mass concentration of 10% for later use.

[0041] (2) Weigh 21g of LiFePO4 and Li 0.34 La 0.56 9 g of TiO3 and 45 g of the polyethersulfone-N-methylpyrrolidone solution were placed in a horizontal planetary mixer and ball-milled for 36 hours. The mixture was then vacuumed for 30 minutes to remove gas from the obtained mixed slurry and set aside.

[0042] (3) The slurry was added to a circular mold with a diameter of 4 cm, and then a wire mesh with a pore size of 150 μm was covered on the upper surface of the slurry. Deionized water was then injected into the upper surface of the slurry to perform phase conversion for 2 hours. After completion, the slurry was dried at 60°C for 24 hours to obtain a dry embryo.

[0043] (4) The dried embryo body is placed in a muffle furnace and heated to 500°C at a rate of 5°C / min, and then kept at this temperature for 90 minutes for debinding. After completion, the muffle furnace is further heated to 700°C at a rate of 5°C / min and kept at this temperature for 360 minutes to perform high-temperature sintering on the dried embryo body. After completion, the muffle furnace is allowed to cool naturally to obtain a straight-hole ceramic composite electrode.

[0044] Example 3

[0045] A method for preparing a straight-pore ceramic composite electrode comprises the following steps:

[0046] (1) Dissolve polyethersulfone in N-methylpyrrolidone to prepare a polyethersulfone-N-methylpyrrolidone solution with a mass concentration of 30% for later use.

[0047] (2) Weigh 21g of LiNiO2 and Li5La3Ta2O according to the mass ratio. 12 9g, 120g of the polyethersulfone-N-methylpyrrolidone solution, the above three raw materials are placed in a horizontal planetary mixer and ball-milled for 24 hours, and then vacuumed for 30 minutes with a vacuum stirrer to remove the gas in the obtained mixed slurry and set aside.

[0048] (3) The slurry was added to a circular mold with a diameter of 4 cm, and then a copper mesh with a pore size of 150 μm was covered on the upper surface of the slurry. Deionized water was then injected into the upper surface of the slurry for phase conversion for 6 hours. After completion, the slurry was dried at 90°C for 12 hours to obtain a dry embryo.

[0049] (4) The dried embryo body is placed in a muffle furnace and heated to 300°C at a rate of 3°C / min, and then kept at this temperature for 180 minutes for debinding. After completion, the muffle furnace is further heated to 550°C at a rate of 3°C / min and kept at this temperature for 500 minutes to perform high-temperature sintering on the dried embryo body. After completion, the muffle furnace is allowed to cool naturally to obtain a straight-hole ceramic composite electrode.

[0050] Example 4

[0051] A method for preparing a straight-pore ceramic composite electrode comprises the following steps:

[0052] (1) Dissolve polyethersulfone in N-methylpyrrolidone to prepare a polyethersulfone-N-methylpyrrolidone solution with a mass concentration of 40% for later use.

[0053] (2) Weigh 21g of LiNiO2 and Li5La3Ta2O according to the mass ratio. 129g, 70g of the polyethersulfone-N-methylpyrrolidone solution, the above three raw materials are placed in a horizontal planetary mixer and ball milled for 12 hours, and then vacuumed with a vacuum stirrer for 30 minutes to remove the gas in the obtained mixed slurry and set aside.

[0054] (3) The slurry was added to a circular mold with a diameter of 4 cm, and then a copper mesh with a pore size of 150 μm was covered on the upper surface of the slurry. Deionized water was then injected into the upper surface of the slurry for phase conversion for 5 hours. After completion, the slurry was dried at 80°C for 12 hours to obtain a dry embryo.

[0055] (4) The dried embryo body is placed in a muffle furnace and heated to 450°C at a rate of 2°C / min, and then kept at this temperature for 120 minutes for debinding. After completion, the muffle furnace is further heated to 600°C at a rate of 2°C / min and kept at this temperature for 300 minutes to perform high-temperature sintering on the dried embryo body. After completion, the muffle furnace is allowed to cool naturally to obtain a straight-pore ceramic composite electrode.

[0056] Example 5

[0057] A method for preparing a straight-pore ceramic composite electrode comprises the following steps:

[0058] (1) Dissolve polyvinylidene fluoride in N-methylpyrrolidone to prepare a polyvinylidene fluoride-N-methylpyrrolidone solution with a mass concentration of 10% and set aside.

[0059] (2) Weigh 10g of LiFePO4 and Li according to the mass ratio. 0.34 La 0.56 10 g of TiO3 and 80 g of the polyethersulfone-N-methylpyrrolidone solution were placed in a horizontal planetary mixer and ball-milled for 48 hours. The mixture was then vacuumed for 20 minutes to remove gas from the obtained mixed slurry and set aside.

[0060] (3) The slurry was added to a circular mold with a diameter of 4 cm, and then a copper mesh with a pore size of 150 μm was covered on the upper surface of the slurry. Deionized water was then injected into the upper surface of the slurry to perform phase conversion for 4 hours. After completion, the slurry was dried at 70°C for 12 hours to obtain a dry embryo.

[0061] (4) The dried embryo body is placed in a muffle furnace and heated to 500°C at a rate of 10°C / min, and then kept at this temperature for 120 minutes for debinding. After completion, the muffle furnace is further heated to 750°C at a rate of 2°C / min and kept at this temperature for 300 minutes to perform high-temperature sintering on the dried embryo body. After completion, the muffle furnace is allowed to cool naturally to obtain a straight-hole ceramic composite electrode.

[0062] Example 6

[0063] A method for preparing a straight-pore ceramic composite electrode comprises the following steps:

[0064] (1) Dissolve polyethersulfone in N-methylpyrrolidone to prepare a polyethersulfone-N-methylpyrrolidone solution with a mass concentration of 40% for later use.

[0065] (2) Weigh 35g of LiMn2O4 and Li 6.25 Ga 0.25 La3Zr2O 12 15g, 50g of the polyethersulfone-N-methylpyrrolidone solution, the above three raw materials are placed in a horizontal planetary mixer and ball-milled for 48 hours, and then vacuumed for 20 minutes with a vacuum stirrer to remove the gas in the obtained mixed slurry and set aside.

[0066] (3) The slurry was added to a circular mold with a diameter of 4 cm, and then a wire mesh with a pore size of 150 μm was covered on the upper surface of the slurry. Deionized water was then injected into the upper surface of the slurry to perform phase conversion for 4 hours. After completion, the slurry was dried at 70°C for 12 hours to obtain a dry embryo.

[0067] (4) The dried embryo body is placed in a muffle furnace and heated to 500°C at a rate of 10°C / min, and then kept at this temperature for 120 minutes for debinding. After completion, the muffle furnace is further heated to 750°C at a rate of 2°C / min and kept at this temperature for 300 minutes to perform high-temperature sintering on the dried embryo body. After completion, the muffle furnace is allowed to cool naturally to obtain a straight-hole ceramic composite electrode.

[0068] Example 7

[0069] A method for preparing a straight-pore ceramic composite electrode comprises the following steps:

[0070] (1) Dissolve polytetrafluoroethylene in N-methylpyrrolidone to prepare a polytetrafluoroethylene-N-methylpyrrolidone solution with a mass concentration of 25% and set aside.

[0071] (2) Weigh 10g LiMnPO4 and 10g Li5La3Ta2O according to the mass ratio. 12 35g, 55g of the polyethersulfone-N-methylpyrrolidone solution, the above three raw materials are placed in a horizontal planetary mixer and ball milled for 48 hours, and then vacuumed for 20 minutes with a vacuum stirrer to remove the gas in the obtained mixed slurry and set aside.

[0072] (3) The slurry was added to a circular mold with a diameter of 4 cm, and then a nickel mesh with a pore size of 150 μm was covered on the upper surface of the slurry. Deionized water was then injected into the upper surface of the slurry to perform phase conversion for 4 hours. After completion, the slurry was dried at 70°C for 12 hours to obtain a dry embryo.

[0073] (4) The dried embryo body is placed in a muffle furnace and heated to 500°C at a rate of 10°C / min, and then kept at this temperature for 120 minutes for debinding. After completion, the muffle furnace is further heated to 750°C at a rate of 2°C / min and kept at this temperature for 300 minutes to perform high-temperature sintering on the dried embryo body. After completion, the muffle furnace is allowed to cool naturally to obtain a straight-hole ceramic composite electrode.

[0074] Performance testing:

[0075] Figure 1 This is a cross-sectional SEM image of the straight-pore ceramic composite electrode prepared in Example 1. A clear straight-pore structure can be seen in the figure, and the thickness is close to 800μm. In traditional thin-film batteries, the electrode material generally does not exceed 100μm. The electrode material loading of the prepared straight-pore ceramic composite electrode far exceeds that of traditional thin-film batteries. The straight-pore structure shown in the figure can provide a large specific surface area, provide a buffer zone for the volume change of the electrode material during the charge and discharge process, and greatly improve the stability of the battery. The main principle is: pouring sol organic electrolyte material and conductive carbon into the ceramic composite positive electrode to conduct lithium ions and electrons. The higher specific surface area provides a large number of ion transfer interfaces, which promotes the conduction of lithium ions and provides a guarantee for charging and discharging under large loads. In addition, the conductive carbon in the pores can effectively transfer electrons, which can effectively inhibit the growth of lithium branched crystals caused by uneven charge distribution.

[0076] Figure 2 This is the XRD pattern of the straight-pore ceramic composite electrode prepared in Example 1. The characteristic peaks are primarily due to the cathode material, lithium cobalt oxide (LCO2), and the electrolyte material, lithium aluminum titanium phosphate (LATP). XRD analysis demonstrates that the ceramic composite cathode material can maintain the crystal structure of the original material system under co-firing conditions.

[0077] Figure 3 This figure compares the charge and discharge capacity of a solid-state lithium battery with a straight-pore ceramic composite electrode prepared in Example 1 with a conventional thin-film battery. The figure shows that under the same charge and discharge cutoff voltages, the ceramic composite electrode has a higher charge and discharge capacity of approximately 150 mAh / g, while the conventional thin-film battery only maintains 83 mAh / g. This comparison demonstrates that the ceramic composite electrode has a higher capacity than the conventional thin-film battery. This demonstrates that the solid-state lithium battery with a straight-pore ceramic composite electrode prepared in this invention maintains a high capacity even under high loads.

[0078] Figure 4The figure shows a comparison of the cycle performance of the solid-state lithium battery with straight-pore ceramic composite electrodes prepared in Example 1 and the traditional thin-film battery. It can be seen from the figure that the battery prepared with the ceramic composite electrode shows higher cycle test stability, and can maintain more than 95% of the initial capacity after 80 cycles, and the charge and discharge are stable. Traditional thin-film lithium batteries have obvious shortcomings in terms of stability. After 80 cycles of stability testing, their charge and discharge capacity gradually decays to half of the original, and the capacity decay is more obvious. From the above, it can be seen that the solid-state lithium battery with straight-pore ceramic composite electrodes prepared by the present invention still maintains good cycle stability under large loads.

[0079] The foregoing merely illustrates several embodiments of the present invention and should not be construed as limiting the scope of the present invention. It should be noted that modifications, substitutions, and improvements may be made by others skilled in the art without departing from the spirit and scope of the present invention, and such modifications and improvements are all within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be based on the claims described herein.

Claims

1. A method for preparing a straight-pore ceramic composite electrode, characterized in that: The steps include: (1) mixing a positive electrode material, an electrolyte ceramic powder, and a polyethersulfone-N-methylpyrrolidone solution and grinding the mixture to obtain a mixed slurry; the ratio of the positive electrode material, the electrolyte ceramic powder, and the polyethersulfone-N-methylpyrrolidone solution is 10-35%: 10-35%: 50-80%; (2) placing the mixed slurry in a mold, then covering it with a mesh carrier and injecting water to carry out a phase inversion reaction, and drying it after completion to obtain an embryonic body with a straight pore structure inside; (3) The embryo body is heated at 300-500° C. to remove binder, and then sintered at 550-760° C. to obtain the straight pore ceramic composite electrode.

2. The method for preparing a straight-pore ceramic composite electrode according to claim 1, wherein: The mass concentration of the polyethersulfone-N-methylpyrrolidone solution is 10-40%; the polyethersulfone is replaced by polyvinylidene fluoride or polytetrafluoroethylene.

3. The method for preparing a straight-pore ceramic composite electrode according to claim 1, wherein: In step (1), the positive electrode material includes: LiCO2, LiFePO4, LiNiO2, LiMn2O4, LiMn x Ni y Co 1-x-y Any one of O2, LiMnPO4, LiNiPO4, Li3V2(PO4)3; Alternatively, in step (1), the electrolyte ceramic powder includes: LiAlTiPO4, Li 0.34 La 0.56 TiO3, Li5La3Ta2O 12 , Li 6.25 Ga 0.25 La3Zr2O 12 , Li 0.39 La 0.5 Sr 0.06 TiO3, Li 0.33 La 0.46 Y 0.1 TiO3, Li 1.3 Al 0.3 Ti 1.7 Any one of (PO4)3.

4. The method for preparing a straight-pore ceramic composite electrode according to claim 1, wherein: In step (1), the grinding treatment time is 12 to 48 hours.

5. The method for preparing a straight-pore ceramic composite electrode according to claim 1, wherein: In step (2), the mesh carrier includes any one of wire mesh, copper mesh, screen mesh, and nickel mesh.

6. The method for preparing a straight-pore ceramic composite electrode according to claim 1, wherein: In step (2), the drying temperature range is 60-90°C, and the drying time range is 12-24 hours.

7. The method for preparing a straight-pore ceramic composite electrode according to any one of claims 1 to 6, characterized in that: In step (2), the phase inversion reaction time is 2 to 6 hours.

8. The method for preparing a straight-pore ceramic composite electrode according to any one of claims 1 to 6, characterized in that: In step (3), the heating and debinding time is 60 to 120 minutes.

9. The method for preparing a straight-pore ceramic composite electrode according to any one of claims 1 to 6, characterized in that: In step (3), the sintering time is 300-500 min.

10. Application of the straight-pore ceramic composite electrode obtained by the preparation method of the straight-pore ceramic composite electrode according to any one of claims 1 to 9 in the fields of mobile phones, electric vehicles or aerospace.

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