High-temperature isolation corrosion-resistant lithium battery ceramic fiber paper and preparation method thereof

Abstract

The application discloses a high-temperature isolation corrosion-resistant lithium battery ceramic fiber paper and a preparation method thereof, and relates to the technical field of lithium battery ceramic fiber paper preparation. The ceramic fiber paper is composed of a ceramic fiber layer and a ceramic layer, and ceramic fiber layers are firmly adhered to the two sides of the ceramic layer. The ceramic fiber layer is made of ceramic fiber modified by a rare earth phosphate material, and the ceramic layer is made of inorganic ceramic material prepared by carbon nanotube composite modification. The rare earth phosphate material has excellent chemical stability, can effectively resist the corrosion of acid and alkali corrosive media, and the doping of rare earth elements can enhance the crystal lattice structure of the ceramic fiber and improve its mechanical strength, so that the ceramic fiber paper is more tough and durable. Moreover, the modification of the rare earth phosphate can improve the thermal stability of the ceramic fiber, so that the ceramic fiber can still maintain stable performance in a high-temperature environment, meet the requirement of high-temperature isolation, and prolong the service life of the ceramic fiber paper.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of lithium battery ceramic fiber paper preparation, in particular to a high-temperature isolation corrosion-resistant lithium battery ceramic fiber paper and a preparation method thereof. BACKGROUND

[0002] The lithium battery ceramic fiber paper is a paper-like material made of ceramic fiber, which mainly functions as a separator inside the battery to separate the positive and negative electrodes to prevent internal short circuit, while allowing ions to move freely in the electrolyte to ensure the normal charging and discharging process of the battery.

[0003] The existing lithium battery ceramic fiber paper has the following defects:

[0004] 1. Patent document US09105909B2 discloses a separator, including a lithium battery separator and a method for preparing the separator, but the separator prepared in the above document has poor performance in terms of acid and alkali corrosion and performance in high temperature environment;

[0005] 2. Patent document US08003263B2 discloses a separator coated with a gel polymer for use in a rechargeable lithium battery, but the separator prepared in the above document has low mechanical strength and low charge transfer efficiency in use;

[0006] 3. Patent document US09276245B2 discloses a method for forming a film made of polyvinylidene fluoride fluoropolymer for use as a lithium battery separator, but the separator prepared in the above document cannot guarantee the stability of the obtained separator porosity during preparation;

[0007] 4. Patent document CN108666510A discloses a lithium battery separator paper and a manufacturing method thereof, but the lithium battery separator paper prepared in the above document has the technical problems of high process load, high production cost and low production efficiency. SUMMARY

[0008] The present application aims to provide a high-temperature isolation corrosion-resistant lithium battery ceramic fiber paper and a preparation method thereof to solve the technical problems raised in the background.

[0009] To achieve the above-mentioned purpose, the present application provides the following technical solution: a high-temperature isolation corrosion-resistant lithium battery ceramic fiber paper, which is composed of a ceramic fiber layer and a ceramic layer, and the two sides of the ceramic layer are firmly bonded with the ceramic fiber layer, the ceramic fiber layer uses ceramic fiber modified by rare earth phosphate material, and the ceramic layer is made of inorganic ceramic material prepared by carbon nanotube composite modification;

[0010] The thickness of the ceramic fiber paper is 10-500 μm, the thickness of the ceramic fiber layer is 3-150 μm, the thickness of the ceramic layer is 4-200 μm, and the thickness ratio of the ceramic fiber layer to the ceramic layer is 3:4;

[0011] The ceramic fiber layer is measured by weight fraction of the following components: 8-12 parts of rare earth phosphate material, 58-66 parts of ceramic fiber, 1-5 parts of dispersant, 1-3 parts of binder, and 2-8 parts of pore-forming agent;

[0012] The ceramic layer is measured by weight fraction of the following components: 12-18 parts of carbon nanotube, 65-72 parts of inorganic ceramic material, 2-6 parts of stabilizer, and 2-5 parts of surfactant.

[0013] Preferably, the preparation steps of the high-temperature isolation corrosion-resistant lithium battery ceramic fiber paper are as follows:

[0014] Step S1, preparing raw materials for preparing ceramic fiber layer and ceramic layer;

[0015] Step S2, adding the raw materials for preparing the ceramic fiber layer prepared in step S1 into the beater, filling 20-28 parts of deionized water solution into the beater, and mixing and beating in the beater for 35-55 min to obtain uniformly dispersed ceramic fiber slurry;

[0016] Step S3, pouring the ceramic fiber slurry obtained in step S2 into the trough of the paper sheet former, ensuring uniform distribution of the solution, starting the paper sheet former, and making the ceramic fiber slurry form a uniform fiber layer on the sheeting net. During the sheeting process, the arrangement of the fibers and the formation of the pores are affected by controlling the sheeting speed and pressure. The formed fiber paper is taken off from the sheeting net and placed in a dryer for drying and solidification treatment, and then the required ceramic fiber layer is obtained.

[0017] Step S4, adding the raw materials for preparing the ceramic layer prepared in step S1 into the stirrer, filling 30-35 parts of deionized water solution into the stirrer, and mixing and stirring in the stirrer for 35-55 min to obtain ceramic slurry;

[0018] Step S5, preparing the ceramic preform by the grouting forming process using the ceramic slurry prepared in step S4, and then placing the ceramic preform in a sintering furnace for sintering treatment under the set sintering temperature and time conditions to ensure that the particles inside the ceramic layer are fully combined to form a dense and stable ceramic layer structure.

[0019] Step S6, the prepared ceramic fiber layer and ceramic layer are stacked according to the design requirements, and a curing process is used for curing treatment of the stacked combination;

[0020] Step S7, processing the cured ceramic fiber paper, including cutting, trimming and edge sealing treatment.

[0021] Preferably, the raw materials for preparing the ceramic fiber layer in step S1 include rare earth phosphate materials, ceramic fibers, dispersants, binders and pore-forming agents, the ceramic fibers use one or more of alumina silicate fibers, zirconium-containing ceramic fibers or polycrystalline alumina fibers, the dispersants use one or more of sodium polyacrylate, sodium hexametaphosphate or sodium tripolyphosphate, the binders use one or more of polyvinyl alcohol, polyethylene glycol or carboxymethyl cellulose, and the pore-forming agents use one or more of ammonium bicarbonate, urea or graphite powder.

[0022] Preferably, the speed of the sheeting in step S3 is 1 m / min-2 m / min, the pressure is 1.5 m / min-2.5 kPa, the drying temperature of the dryer is 70℃-85℃, and the drying time is 2 h-3 h.

[0023] Preferably, the raw materials for preparing the ceramic layer in step S1 include carbon nanotubes, inorganic ceramic materials, stabilizers and surfactants, the inorganic ceramic materials use one or more of alumina, silica or zirconia, the stabilizers use one or more of silicon carbide or tungsten carbide, and the surfactants use one or more of silane coupling agents or aluminate coupling agents.

[0024] Preferably, the slip casting process in step S5 includes a porous gypsum mold, the ceramic slurry is injected into the porous gypsum mold, and under the action of the capillary force of the porous gypsum mold, the water in the ceramic slurry is absorbed to form a dense embryo structure, and after the embryo is formed, the porous gypsum mold is disassembled to take out the injection part, after removing the excess material, it is naturally dried in a room temperature environment to obtain a ceramic preform.

[0025] Preferably, the sintering treatment in step S5 is carried out in an inert atmosphere, the sintering temperature is adjusted according to the type of selected inorganic ceramic material and the composite amount of carbon nanotubes, and the temperature is controlled at 170℃-190℃ to ensure that the ceramic layer has the required density and microstructure, and the inert atmosphere uses nitrogen or argon.

[0026] Preferably, the stacking combination in step S6 is to stack the ceramic fiber layer and the ceramic layer according to the order and the number of layers required by the design.

[0027] Preferably, the curing process in step S6 adopts ultraviolet curing or thermal curing, the curing temperature is 160-180 DEG C, and the curing time is 15-25 min, so as to ensure that the laminated composition is completely cured and has the required mechanical strength.

[0028] Preferably, the processing treatment in step S6 further comprises edge sealing treatment on the cut and trimmed ceramic fiber paper, so as to prevent edge peeling or cracking during use, and the edge sealing treatment adopts one of coating a sealing agent and laser welding.

[0029] Compared with the prior art, the application has the following beneficial effects:

[0030] 1. The rare earth phosphate material has excellent chemical stability, can effectively resist the corrosion of acid and alkali corrosive media, the doping of rare earth elements can enhance the crystal lattice structure of the ceramic fiber, improve the mechanical strength, make the ceramic fiber paper more tough and durable, and the modification of the rare earth phosphate can improve the thermal stability of the ceramic fiber, so that it can still maintain stable performance in high temperature environment, meet the demand of high temperature isolation, thereby achieving the effect of prolonging the service life of the ceramic fiber paper.

[0031] 2. The carbon nanotube has good electrical conductivity, and when it is compounded into inorganic ceramic material, the electrical conductivity of the ceramic layer can be significantly improved, and the addition of the carbon nanotube can refine the crystal grains of the ceramic material and optimize the microstructure, thereby improving the mechanical strength, corrosion resistance and charge transmission efficiency of the lithium battery of the obtained ceramic fiber paper.

[0032] 3. The paper sheet former can uniformly distribute the ceramic fiber slurry on the sheeting net, ensure that the ceramic fiber layer has uniform thickness and microstructure, and by accurately controlling the sheeting speed and pressure, the arrangement of the fibers and the formation of the pores can be affected, and the sheeting is completed under the preset sheeting speed and pressure, which is beneficial to the stability of the porosity of the ceramic fiber paper.

[0033] 4. The capillary force of the porous gypsum mold helps to absorb the water in the ceramic slurry, form a dense embryo structure, thereby improving the density and mechanical strength of the ceramic layer, and the process is simple and easy to control, which helps to reduce the production cost and improve the production efficiency.

[0034] 5. The inert atmosphere can protect the ceramic material from being oxidized at high temperature, so as to maintain its original chemical composition and performance, and in the sintering process, it helps the particles in the ceramic material to fully combine, and at the same time, it can refine the crystal grains of the ceramic material, optimize the microstructure, form a more dense structure, and improve the mechanical strength and thermal stability of the material. BRIEF DESCRIPTION OF DRAWINGS

[0035] Figure 1 Preparation steps of the ceramic fiber paper for lithium battery of the present application;

[0036] Figure 2 Overall structure of the ceramic fiber paper for lithium battery of the present application;

[0037] Figure 3 Cross-sectional structure of the ceramic fiber paper for lithium battery of the present application.

[0038] In the figure: 1, ceramic fiber layer; 2, ceramic layer. DETAILED DESCRIPTION

[0039] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0040] In the description of the present application, it should be noted that the terms "upper", "lower", "inner", "outer", "front end", "rear end", "two ends", "one end", "the other end" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0041] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "provided with", "connection" and the like should be broadly understood, for example, "connection" can be fixed connection, can also be detachable connection, or integral connection; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be the communication inside two elements. For those of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0042] Example 1: Please refer to Figure 1 , Figure 2 and Figure 3The present invention provides an embodiment of a high-temperature insulating and corrosion-resistant lithium battery ceramic fiber paper, which is composed of a ceramic fiber layer 1 and a ceramic layer 2, and the ceramic fiber layer 1 is firmly bonded to both sides of the ceramic layer 2. The ceramic fiber layer 1 is made of ceramic fiber modified with rare earth phosphate material, and the ceramic layer 2 is made of inorganic ceramic material prepared by carbon nanotube composite modification.

[0043] The thickness of the ceramic fiber paper is 10μm, the thickness of ceramic fiber layer 1 is 3μm, the thickness of ceramic layer 2 is 4μm, and the thickness ratio of ceramic fiber layer 1 to ceramic layer 2 is 3:4.

[0044] The ceramic fiber layer 1 comprises the following components by weight: 8 parts rare earth phosphate material, 58 parts ceramic fiber, 1 part dispersant, 1 part binder, and 2 parts pore-forming agent;

[0045] The ceramic layer 2 comprises the following components by weight: 12 parts carbon nanotubes, 65 parts inorganic ceramic materials, 2 parts stabilizer, and 2 parts surfactant.

[0046] The preparation steps of this high-temperature insulating and corrosion-resistant lithium battery ceramic fiber paper are as follows:

[0047] Step S1: Prepare the raw materials for preparing ceramic fiber layer 1 and ceramic layer 2;

[0048] Step S2: Add the raw materials for preparing ceramic fiber layer 1 prepared in step S1 to the pulping machine, and fill the pulping machine with 20 parts of deionized aqueous solution. Mix and pulp the pulping machine for 45 minutes to obtain a uniformly dispersed ceramic fiber slurry.

[0049] Step S3: Pour the ceramic fiber slurry obtained in step S2 into the feed trough of the paper sheet forming machine to ensure uniform distribution of the solution. Start the paper sheet forming machine to make the ceramic fiber slurry form a uniform fiber layer on the forming wire. During the forming process, the fiber arrangement and pore formation are affected by controlling the forming speed and pressure. The formed fiber paper is removed from the forming wire and placed in a dryer for drying and curing treatment to obtain the required ceramic fiber layer 1.

[0050] Step S4: Add the raw materials for preparing ceramic layer 2 prepared in step S1 to the mixer, and fill the mixer with 30 parts of deionized aqueous solution. Mix and stir for 45 minutes to obtain ceramic slurry.

[0051] Step S5: The ceramic slurry prepared in step S4 is used to form a ceramic preform through a slurry casting process. Then, the ceramic preform is placed in a sintering furnace and sintered under the set sintering temperature and time conditions to ensure that the particles inside the ceramic layer 2 are fully bonded and form a dense and stable ceramic layer 2 structure.

[0052] Step S6: Stack the prepared ceramic fiber layer 1 and ceramic layer 2 according to the design requirements, and cure the stacked composition using a curing process.

[0053] Step S7: Process the cured ceramic fiber paper, including cutting, trimming and edge sealing.

[0054] The raw materials for preparing ceramic fiber layer 1 in step S1 include rare earth phosphate materials, ceramic fibers, dispersants, binders and pore-forming agents. The ceramic fibers are alumina silicate fibers, the dispersant is sodium polyacrylate, the binder is polyvinyl alcohol, and the pore-forming agent is ammonium bicarbonate.

[0055] In step S3, the sheet-making speed is 1 m / min, the pressure is 1.5 m / min, the drying temperature of the dryer is 70℃, and the drying time is 2 h.

[0056] The raw materials for preparing ceramic layer 2 in step S1 include carbon nanotubes, inorganic ceramic materials, stabilizers and surfactants. The inorganic ceramic material is alumina, the stabilizer is silicon carbide, and the surfactant is a silane coupling agent.

[0057] The slurry casting process in step S5 includes a porous gypsum mold, into which ceramic slurry is injected and the water in the ceramic slurry is absorbed by the capillary force of the porous gypsum mold to form a dense preform structure. After the preform is formed, the porous gypsum mold is disassembled to remove the casting. After removing the excess material, the casting is naturally dried at room temperature to obtain a ceramic preform.

[0058] The sintering process in step S5 is carried out in an inert atmosphere. The sintering temperature is adjusted according to the type of inorganic ceramic material and the amount of carbon nanotubes. The temperature is controlled at 170°C to ensure that the ceramic layer 2 has the required density and microstructure. Nitrogen is used as the inert atmosphere.

[0059] The stacking combination in step S6 is to stack ceramic fiber layer 1 and ceramic layer 2 according to the order and number of layers required by the design.

[0060] The curing process in step S6 uses ultraviolet curing at a temperature of 160°C for 15 minutes to ensure that the laminated composition is fully cured and has the required mechanical strength.

[0061] The processing in step S6 also includes edge sealing of the cut and trimmed ceramic fiber paper to prevent edge peeling or cracking during use. The edge sealing method is to apply a sealant.

[0062] Example 2: Please refer to Figure 1 ,Figure 2 and Figure 3 The present invention provides an embodiment of a high-temperature insulating and corrosion-resistant lithium battery ceramic fiber paper, which is composed of a ceramic fiber layer 1 and a ceramic layer 2, and the ceramic fiber layer 1 is firmly bonded to both sides of the ceramic layer 2. The ceramic fiber layer 1 is made of ceramic fiber modified with rare earth phosphate material, and the ceramic layer 2 is made of inorganic ceramic material prepared by carbon nanotube composite modification.

[0063] The thickness of the ceramic fiber paper is 100μm, the thickness of ceramic fiber layer 1 is 30μm, the thickness of ceramic layer 2 is 40μm, and the thickness ratio of ceramic fiber layer 1 to ceramic layer 2 is 3:4.

[0064] The ceramic fiber layer 1 comprises the following components by weight: 12 parts rare earth phosphate material, 66 parts ceramic fiber, 5 parts dispersant, 3 parts binder, and 8 parts pore-forming agent;

[0065] The ceramic layer 2 comprises the following components by weight: 18 parts carbon nanotubes, 72 parts inorganic ceramic materials, 6 parts stabilizer, and 5 parts surfactant.

[0066] The preparation steps of this high-temperature insulating and corrosion-resistant lithium battery ceramic fiber paper are as follows:

[0067] Step S1: Prepare the raw materials for preparing ceramic fiber layer 1 and ceramic layer 2;

[0068] Step S2: Add the raw materials for preparing ceramic fiber layer 1 prepared in step S1 to the pulping machine, and fill the pulping machine with 28 parts of deionized aqueous solution. Mix and pulp the pulping machine for 45 minutes to obtain a uniformly dispersed ceramic fiber slurry.

[0069] Step S3: Pour the ceramic fiber slurry obtained in step S2 into the feed trough of the paper sheet forming machine to ensure uniform distribution of the solution. Start the paper sheet forming machine to make the ceramic fiber slurry form a uniform fiber layer on the forming wire. During the forming process, the fiber arrangement and pore formation are affected by controlling the forming speed and pressure. The formed fiber paper is removed from the forming wire and placed in a dryer for drying and curing treatment to obtain the required ceramic fiber layer 1.

[0070] Step S4: Add the raw materials for preparing ceramic layer 2 prepared in step S1 to the mixer, and fill the mixer with 35 parts of deionized aqueous solution. Mix and stir for 45 minutes to obtain ceramic slurry.

[0071] Step S5: The ceramic slurry prepared in step S4 is used to form a ceramic preform through a slurry casting process. Then, the ceramic preform is placed in a sintering furnace and sintered under the set sintering temperature and time conditions to ensure that the particles inside the ceramic layer 2 are fully bonded and form a dense and stable ceramic layer 2 structure.

[0072] Step S6: Stack the prepared ceramic fiber layer 1 and ceramic layer 2 according to the design requirements, and cure the stacked composition using a curing process.

[0073] Step S7: Process the cured ceramic fiber paper, including cutting, trimming and edge sealing.

[0074] The raw materials for preparing ceramic fiber layer 1 in step S1 include rare earth phosphate materials, ceramic fibers, dispersants, binders and pore-forming agents. The ceramic fibers are alumina silicate fibers and zirconium-containing ceramic fibers. The dispersants are sodium polyacrylate and sodium hexametaphosphate. The binders are polyvinyl alcohol and polyethylene glycol. The pore-forming agents are ammonium bicarbonate and urea.

[0075] In step S3, the sheet-making speed is 2 m / min, the pressure is 2.5 kPa, the drying temperature of the dryer is 85℃, and the drying time is 3 h.

[0076] The raw materials for preparing ceramic layer 2 in step S1 include carbon nanotubes, inorganic ceramic materials, stabilizers and surfactants. The inorganic ceramic materials are alumina and silicon dioxide, the stabilizers are silicon carbide and tungsten carbide, and the surfactants are silane coupling agents and aluminate coupling agents.

[0077] The slurry casting process in step S5 includes a porous gypsum mold, into which ceramic slurry is injected and the water in the ceramic slurry is absorbed by the capillary force of the porous gypsum mold to form a dense preform structure. After the preform is formed, the porous gypsum mold is disassembled to remove the casting. After removing the excess material, the casting is naturally dried at room temperature to obtain a ceramic preform.

[0078] The sintering process in step S5 is carried out in an inert atmosphere. The sintering temperature is adjusted according to the type of inorganic ceramic material and the amount of carbon nanotubes. The temperature is controlled at 190°C to ensure that the ceramic layer 2 has the required density and microstructure. Argon is used as the inert atmosphere.

[0079] The stacking combination in step S6 is to stack ceramic fiber layer 1 and ceramic layer 2 according to the order and number of layers required by the design.

[0080] The curing process in step S6 uses thermal curing at a temperature of 180°C for 25 minutes to ensure that the laminated composition is fully cured and has the required mechanical strength.

[0081] The processing in step S6 also includes edge sealing of the cut and trimmed ceramic fiber paper to prevent edge peeling or cracking during use. The edge sealing method is laser welding.

[0082] Example 3: Please refer to Figure 1 , Figure 2 and Figure 3 The present invention provides an embodiment of a high-temperature insulating and corrosion-resistant lithium battery ceramic fiber paper, which is composed of a ceramic fiber layer 1 and a ceramic layer 2, and the ceramic fiber layer 1 is firmly bonded to both sides of the ceramic layer 2. The ceramic fiber layer 1 is made of ceramic fiber modified with rare earth phosphate material, and the ceramic layer 2 is made of inorganic ceramic material prepared by carbon nanotube composite modification.

[0083] The thickness of the ceramic fiber paper is 300μm, the thickness of ceramic fiber layer 1 is 90μm, the thickness of ceramic layer 2 is 120μm, and the thickness ratio of ceramic fiber layer 1 to ceramic layer 2 is 3:4.

[0084] The ceramic fiber layer 1 comprises the following components by weight: 10 parts phosphoric acid, 64 parts ceramic fiber, 3 parts dispersant, 2 parts binder, and 5 parts pore-forming agent;

[0085] The ceramic layer 2 comprises the following components by weight: 16 parts carbon nanotubes, 69 parts inorganic ceramic materials, 4 parts stabilizer, and 4 parts surfactant.

[0086] The preparation steps of this high-temperature insulating and corrosion-resistant lithium battery ceramic fiber paper are as follows:

[0087] Step S1: Prepare the raw materials for preparing ceramic fiber layer 1 and ceramic layer 2;

[0088] Step S2: Add the raw materials for preparing ceramic fiber layer 1 prepared in step S1 to the pulping machine, and fill the pulping machine with 24 parts of deionized aqueous solution. Mix and pulp the pulping machine for 45 minutes to obtain a uniformly dispersed ceramic fiber slurry.

[0089] Step S3: Pour the ceramic fiber slurry obtained in step S2 into the feed trough of the paper sheet forming machine to ensure uniform distribution of the solution. Start the paper sheet forming machine to make the ceramic fiber slurry form a uniform fiber layer on the forming wire. During the forming process, the fiber arrangement and pore formation are affected by controlling the forming speed and pressure. The formed fiber paper is removed from the forming wire and placed in a dryer for drying and curing treatment to obtain the required ceramic fiber layer 1.

[0090] Step S4: Add the raw materials for preparing ceramic layer 2 prepared in step S1 to the mixer, and fill the mixer with 33 parts of deionized aqueous solution. Mix and stir for 45 minutes to obtain ceramic slurry.

[0091] Step S5: The ceramic slurry prepared in step S4 is used to form a ceramic preform through a slurry casting process. Then, the ceramic preform is placed in a sintering furnace and sintered under the set sintering temperature and time conditions to ensure that the particles inside the ceramic layer 2 are fully bonded and form a dense and stable ceramic layer 2 structure.

[0092] Step S6: Stack the prepared ceramic fiber layer 1 and ceramic layer 2 according to the design requirements, and cure the stacked composition using a curing process.

[0093] Step S7: Process the cured ceramic fiber paper, including cutting, trimming and edge sealing.

[0094] The raw materials for preparing ceramic fiber layer 1 in step S1 include rare earth phosphate materials, ceramic fibers, dispersants, binders and pore-forming agents. The ceramic fibers are polycrystalline alumina fibers, the dispersant is sodium tripolyphosphate, the binder is carboxymethyl cellulose, and the pore-forming agent is graphite powder.

[0095] In step S3, the sheet-making speed is 1.5 m / min, the pressure is 2 kPa, the drying temperature of the dryer is 80℃, and the drying time is 2.5 h.

[0096] The raw materials for preparing ceramic layer 2 in step S1 include carbon nanotubes, inorganic ceramic materials, stabilizers and surfactants. The inorganic ceramic material is zirconium oxide, the stabilizer is tungsten carbide, and the surfactant is an aluminate coupling agent.

[0097] The slurry casting process in step S5 includes a porous gypsum mold, into which ceramic slurry is injected and the water in the ceramic slurry is absorbed by the capillary force of the porous gypsum mold to form a dense preform structure. After the preform is formed, the porous gypsum mold is disassembled to remove the casting. After removing the excess material, the casting is naturally dried at room temperature to obtain a ceramic preform.

[0098] The sintering process in step S5 is carried out in an inert atmosphere. The sintering temperature is adjusted according to the type of inorganic ceramic material and the amount of carbon nanotubes. The temperature is controlled at 180°C to ensure that the ceramic layer 2 has the required density and microstructure. Argon is used as the inert atmosphere.

[0099] The stacking combination in step S6 is to stack ceramic fiber layer 1 and ceramic layer 2 according to the order and number of layers required by the design.

[0100] The curing process in step S6 uses thermal curing at a temperature of 170°C for 20 minutes to ensure that the laminated composition is fully cured and has the required mechanical strength.

[0101] The processing in step S6 also includes edge sealing of the cut and trimmed ceramic fiber paper to prevent edge peeling or cracking during use. The edge sealing method is laser welding.

[0102] Example 4: Please refer to Figure 1 , Figure 2 and Figure 3 The present invention provides an embodiment of a high-temperature insulating and corrosion-resistant lithium battery ceramic fiber paper, which is composed of a ceramic fiber layer 1 and a ceramic layer 2, and the ceramic fiber layer 1 is firmly bonded to both sides of the ceramic layer 2. The ceramic fiber layer 1 is made of ceramic fiber modified with rare earth phosphate material, and the ceramic layer 2 is made of inorganic ceramic material prepared by carbon nanotube composite modification.

[0103] The thickness of the ceramic fiber paper is 400μm, the thickness of ceramic fiber layer 1 is 120μm, the thickness of ceramic layer 2 is 160μm, and the thickness ratio of ceramic fiber layer 1 to ceramic layer 2 is 3:4.

[0104] The ceramic fiber layer 1 comprises the following components by weight: 9 parts rare earth phosphate material, 64 parts ceramic fiber, 2 parts dispersant, 3 parts binder, and 4 parts pore-forming agent;

[0105] The ceramic layer 2 comprises the following components by weight: 14 parts carbon nanotubes, 70 parts inorganic ceramic materials, 3 parts stabilizer, and 4 parts surfactant.

[0106] The preparation steps of this high-temperature insulating and corrosion-resistant lithium battery ceramic fiber paper are as follows:

[0107] Step S1: Prepare the raw materials for preparing ceramic fiber layer 1 and ceramic layer 2;

[0108] Step S2: Add the raw materials for preparing ceramic fiber layer 1 prepared in step S1 to the pulping machine, and fill the pulping machine with 22 parts of deionized water solution. Mix and pulp the pulping machine for 45 minutes to obtain a uniformly dispersed ceramic fiber slurry.

[0109] Step S3: Pour the ceramic fiber slurry obtained in step S2 into the feed trough of the paper sheet forming machine to ensure uniform distribution of the solution. Start the paper sheet forming machine to make the ceramic fiber slurry form a uniform fiber layer on the forming wire. During the forming process, the fiber arrangement and pore formation are affected by controlling the forming speed and pressure. The formed fiber paper is removed from the forming wire and placed in a dryer for drying and curing treatment to obtain the required ceramic fiber layer 1.

[0110] Step S4: Add the raw materials for preparing ceramic layer 2 prepared in step S1 to the mixer, and fill the mixer with 31 parts of deionized aqueous solution. Mix and stir the mixture for 45 minutes to obtain ceramic slurry.

[0111] Step S5: The ceramic slurry prepared in step S4 is used to form a ceramic preform through a slurry casting process. Then, the ceramic preform is placed in a sintering furnace and sintered under the set sintering temperature and time conditions to ensure that the particles inside the ceramic layer 2 are fully bonded and form a dense and stable ceramic layer 2 structure.

[0112] Step S6: Stack the prepared ceramic fiber layer 1 and ceramic layer 2 according to the design requirements, and cure the stacked composition using a curing process.

[0113] Step S7: Process the cured ceramic fiber paper, including cutting, trimming and edge sealing.

[0114] The raw materials for preparing ceramic fiber layer 1 in step S1 include rare earth phosphate materials, ceramic fibers, dispersants, binders and pore-forming agents. The ceramic fibers are zirconium-containing ceramic fibers, the dispersant is sodium hexametaphosphate, the binder is polyethylene glycol, and the pore-forming agent is urea.

[0115] In step S3, the sheet-making speed is 1.2 m / min, the pressure is 1.8 kPa, the drying temperature of the dryer is 73℃, and the drying time is 2.2 h.

[0116] The raw materials for preparing ceramic layer 2 in step S1 include carbon nanotubes, inorganic ceramic materials, stabilizers and surfactants. The inorganic ceramic material is silicon dioxide, the stabilizer is silicon carbide, and the surfactant is a silane coupling agent.

[0117] The slurry casting process in step S5 includes a porous gypsum mold, into which ceramic slurry is injected and the water in the ceramic slurry is absorbed by the capillary force of the porous gypsum mold to form a dense preform structure. After the preform is formed, the porous gypsum mold is disassembled to remove the casting. After removing the excess material, the casting is naturally dried at room temperature to obtain a ceramic preform.

[0118] The sintering process in step S5 is carried out in an inert atmosphere. The sintering temperature is adjusted according to the type of inorganic ceramic material and the amount of carbon nanotubes. The temperature is controlled at 175°C to ensure that the ceramic layer 2 has the required density and microstructure. Nitrogen is used as the inert atmosphere.

[0119] The stacking combination in step S6 is to stack ceramic fiber layer 1 and ceramic layer 2 according to the order and number of layers required by the design.

[0120] The curing process in step S6 uses ultraviolet curing or heat curing, with a curing temperature of 165°C and a curing time of 23 minutes, to ensure that the laminated composition is completely cured and has the required mechanical strength.

[0121] The processing in step S6 also includes edge sealing of the cut and trimmed ceramic fiber paper to prevent edge peeling or cracking during use. The edge sealing method is to apply a sealant.

[0122] Example 5: Please refer to Figure 1 , Figure 2 and Figure 3 The present invention provides an embodiment of a high-temperature insulating and corrosion-resistant lithium battery ceramic fiber paper, which is composed of a ceramic fiber layer 1 and a ceramic layer 2, and the ceramic fiber layer 1 is firmly bonded to both sides of the ceramic layer 2. The ceramic fiber layer 1 is made of ceramic fiber modified with rare earth phosphate material, and the ceramic layer 2 is made of inorganic ceramic material prepared by carbon nanotube composite modification.

[0123] The thickness of the ceramic fiber paper is 500μm, the thickness of ceramic fiber layer 1 is 150μm, the thickness of ceramic layer 2 is 200μm, and the thickness ratio of ceramic fiber layer 1 to ceramic layer 2 is 3:4.

[0124] The ceramic fiber layer 1 comprises the following components by weight: 11 parts rare earth phosphate material, 60 parts ceramic fiber, 4 parts dispersant, 1 part binder, and 7 parts pore-forming agent;

[0125] The ceramic layer 2 comprises the following components by weight: 16 parts carbon nanotubes, 67 parts inorganic ceramic materials, 5 parts stabilizer, and 3 parts surfactant.

[0126] The preparation steps of this high-temperature insulating and corrosion-resistant lithium battery ceramic fiber paper are as follows:

[0127] Step S1: Prepare the raw materials for preparing ceramic fiber layer 1 and ceramic layer 2;

[0128] Step S2: Add the raw materials for preparing ceramic fiber layer 1 prepared in step S1 to a pulping machine, and fill the pulping machine with 26 parts of deionized aqueous solution. Mix and pulp the pulping machine for 45 minutes to obtain a uniformly dispersed ceramic fiber slurry.

[0129] Step S3: Pour the ceramic fiber slurry obtained in step S2 into the feed trough of the paper sheet forming machine to ensure uniform distribution of the solution. Start the paper sheet forming machine to make the ceramic fiber slurry form a uniform fiber layer on the forming wire. During the forming process, the fiber arrangement and pore formation are affected by controlling the forming speed and pressure. The formed fiber paper is removed from the forming wire and placed in a dryer for drying and curing treatment to obtain the required ceramic fiber layer 1.

[0130] Step S4: Add the raw materials for preparing ceramic layer 2 prepared in step S1 to the mixer, and fill the mixer with 34 parts of deionized aqueous solution. Mix and stir the mixture for 45 minutes to obtain ceramic slurry.

[0131] Step S5: The ceramic slurry prepared in step S4 is used to form a ceramic preform through a slurry casting process. Then, the ceramic preform is placed in a sintering furnace and sintered under the set sintering temperature and time conditions to ensure that the particles inside the ceramic layer 2 are fully bonded and form a dense and stable ceramic layer 2 structure.

[0132] Step S6: Stack the prepared ceramic fiber layer 1 and ceramic layer 2 according to the design requirements, and cure the stacked composition using a curing process.

[0133] Step S7: Process the cured ceramic fiber paper, including cutting, trimming and edge sealing.

[0134] The raw materials for preparing ceramic fiber layer 1 in step S1 include rare earth phosphate materials, ceramic fibers, dispersants, binders and pore-forming agents. The ceramic fibers are zirconium-containing ceramic fibers and polycrystalline alumina fibers. The dispersants are sodium hexametaphosphate and sodium tripolyphosphate. The binders are polyethylene glycol and carboxymethyl cellulose. The pore-forming agents are urea and graphite powder.

[0135] In step S3, the sheet-making speed is 1.8 m / min, the pressure is 1.6 kPa, the drying temperature of the dryer is 83℃, and the drying time is 2.2 h.

[0136] The raw materials for preparing ceramic layer 2 in step S1 include carbon nanotubes, inorganic ceramic materials, stabilizers and surfactants. The inorganic ceramic materials are silicon dioxide and zirconium oxide. The stabilizer is tungsten carbide, and the surfactant is an aluminate coupling agent.

[0137] The slurry casting process in step S5 includes a porous gypsum mold, into which ceramic slurry is injected and the water in the ceramic slurry is absorbed by the capillary force of the porous gypsum mold to form a dense preform structure. After the preform is formed, the porous gypsum mold is disassembled to remove the casting. After removing the excess material, the casting is naturally dried at room temperature to obtain a ceramic preform.

[0138] The sintering process in step S5 is carried out in an inert atmosphere. The sintering temperature is adjusted according to the type of inorganic ceramic material and the amount of carbon nanotubes. The temperature is controlled at 185°C to ensure that the ceramic layer 2 has the required density and microstructure. Argon is used as the inert atmosphere.

[0139] The stacking combination in step S6 is to stack ceramic fiber layer 1 and ceramic layer 2 according to the order and number of layers required by the design.

[0140] The curing process in step S6 uses ultraviolet curing or heat curing, with a curing temperature of 176°C and a curing time of 23 minutes, to ensure that the laminated composition is completely cured and has the required mechanical strength.

[0141] The processing in step S6 also includes edge sealing of the cut and trimmed ceramic fiber paper to prevent edge peeling or cracking during use. The edge sealing method is laser welding.

[0142] Comparative Example 1: A high-temperature insulating and corrosion-resistant lithium battery ceramic fiber paper, prepared according to the method of Example 1, differing from Example 1 in that: no rare earth phosphate material is added, while other raw materials, steps and parameters are the same as in Example 1.

[0143] Comparative Example 2: A high-temperature insulating and corrosion-resistant lithium battery ceramic fiber paper, prepared according to the method of Example 1, except that carbon nanotubes are not added, while other raw materials, steps and parameters are the same as in Example 1.

[0144] Comparative Example 3: A high-temperature insulating and corrosion-resistant lithium battery ceramic fiber paper, prepared according to the method of Example 1, the difference from Example 1 is that: no rare earth phosphate material is added, and it is replaced with an equal amount (8 parts) of silicon nitride, and other raw materials, steps and parameters are the same as in Example 1.

[0145] Comparative Example 4: A high-temperature insulating and corrosion-resistant lithium battery ceramic fiber paper, prepared according to the method of Example 1, except that carbon nanotubes are not added and are replaced with an equal amount (12 parts) of activated carbon. Other raw materials, steps and parameters are the same as in Example 1.

[0146] Comparative Example 5: A high-temperature insulating and corrosion-resistant lithium battery ceramic fiber paper, prepared according to the method of Example 1, differing from Example 1 in that: a paper sheet forming machine was not used, and the ceramic fiber slurry was directly dried and cured by a dryer. Other raw materials, steps and parameters were the same as in Example 1.

[0147] Comparative Example 6: A high-temperature insulating and corrosion-resistant lithium battery ceramic fiber paper, prepared according to the method of Example 1, the difference from Example 1 is that: instead of using a porous gypsum mold, a metal mold is used, and other raw materials, steps and parameters are the same as in Example 1.

[0148] Comparative Example 7: A high-temperature insulating and corrosion-resistant lithium battery ceramic fiber paper, prepared according to the method of Example 1, except that the sintering process was not carried out in an inert atmosphere, while the other raw materials, steps and parameters were the same as in Example 1.

[0149] Comparative Example 8: Commercially available lithium battery ceramic fiber paper.

[0150] Performance testing:

[0151] Test 1: Thermal conductivity test: A section of the lithium battery ceramic fiber paper obtained in Examples 1-5 and Comparative Examples 1-8 was cut as a representative sample and placed on the test bench. Under normal temperature conditions, the thermal conductivity of the ceramic fiber paper was measured using a thermal conductivity meter to evaluate its thermal insulation performance.

[0152] Test 2: Corrosion resistance test: A section of the lithium battery ceramic fiber paper obtained in Examples 1-5 and Comparative Examples 1-8 was cut as a representative sample and placed on the test bench. The ceramic fiber paper was exposed to different chemical media for 24 hours at room temperature to evaluate its corrosion rate against acid and alkali chemicals.

[0153] Test 3: Porosity test: The porosity of the lithium battery ceramic fiber paper obtained in Examples 1-5 and Comparative Examples 1-8 was measured in accordance with GB / T21650.1-2008 "Determination of pore size distribution and porosity of solid materials by mercury intrusion porosimetry and gas adsorption method - Part 1: Mercury intrusion porosimetry".

[0154] Test 4: High temperature resistance test: A section of the lithium battery ceramic fiber paper obtained in Examples 1-5 and Comparative Examples 1-8 was cut as a representative sample and placed on the test bench. The sample was heated to 150°C in a high temperature furnace and kept for 1 hour. The appearance of the sample was checked for changes (such as melting, discoloration, cracking).

[0155] Table 1 Performance Tests of High-Temperature Insulation and Corrosion-Resistant Lithium-ion Battery Ceramic Fiber Paper

[0156] Furthermore, the addition of rare earth phosphate materials provides excellent chemical stability, effectively resisting the erosion of acidic and alkaline corrosive media. The doping of rare earth elements can enhance the crystal structure of ceramic fibers, improve their mechanical strength, and make ceramic fiber paper more tough and durable. In addition, the modification of rare earth phosphates can improve the thermal stability of ceramic fibers, enabling them to maintain stable performance in high-temperature environments, meeting the requirements of high-temperature insulation, thereby extending the service life of ceramic fiber paper.

[0157] Furthermore, by incorporating carbon nanotubes, which possess excellent electrical conductivity, their composite inclusion in inorganic ceramic materials can significantly enhance the electrical conductivity of ceramic layer 2. Moreover, the addition of carbon nanotubes can refine the grains of the ceramic material, optimize its microstructure, and thereby improve the mechanical strength, corrosion resistance, and charge transport efficiency of the obtained ceramic fiber paper and lithium battery.

[0158] Furthermore, the paper sheet forming device can evenly distribute the ceramic fiber slurry on the forming wire, ensuring that the ceramic fiber layer 1 has a uniform thickness and microstructure. By precisely controlling the forming speed and pressure, the fiber arrangement and pore formation can be affected. Completing the forming process under the preset forming speed and pressure helps to ensure the stability of the porosity of the ceramic fiber paper.

[0159] Furthermore, the capillary force of the porous gypsum mold helps to absorb moisture from the ceramic slurry, forming a dense body structure, thereby improving the density and mechanical strength of the ceramic layer 2. The process is simple and easy to control, which helps to reduce production costs and improve production efficiency.

[0160] Furthermore, an inert atmosphere can protect ceramic materials from oxidation at high temperatures, thus maintaining their original chemical composition and properties. During the sintering process, it helps the particles inside the ceramic material to fully combine, while also refining the grain size of the ceramic material, optimizing its microstructure, forming a denser structure, and improving the mechanical strength and thermal stability of the material.

[0161] The working principle involves using rare earth phosphate materials, which possess excellent chemical stability and effectively resist corrosion from acidic and alkaline media. The doping of rare earth elements enhances the crystal structure of ceramic fibers, improving their mechanical strength and making the ceramic fiber paper more durable. Furthermore, rare earth phosphate modification improves the thermal stability of ceramic fibers, allowing them to maintain stable performance at high temperatures, meeting the requirements for high-temperature insulation and extending the service life of the ceramic fiber paper. The inclusion of carbon nanotubes, with their excellent electrical conductivity, significantly improves the conductivity of ceramic layer 2 when incorporated into inorganic ceramic materials. The addition of carbon nanotubes also refines the grain size of the ceramic material, optimizing its microstructure, thereby improving the mechanical strength, corrosion resistance, and charge transfer efficiency of the obtained ceramic fiber paper for lithium batteries. A paper sheet forming device then processes the ceramic fibers... The slurry is evenly distributed on the forming mesh, ensuring that the ceramic fiber layer 1 has a uniform thickness and microstructure. By precisely controlling the forming speed and pressure, the fiber arrangement and pore formation can be affected. Forming at the preset forming speed and pressure helps to ensure porosity. The capillary force of the porous gypsum mold helps to absorb water from the ceramic slurry, forming a dense preform structure, thereby improving the density and mechanical strength of the ceramic layer 2. The process is simple and easy to control, which helps to reduce production costs and improve production efficiency. The inert atmosphere protects the ceramic material from oxidation at high temperatures, thus maintaining its original chemical composition and properties. Furthermore, the sintering process helps the particles inside the ceramic material to fully combine, while also refining the ceramic grains, optimizing its microstructure, forming a denser structure, and improving the mechanical strength and thermal stability of the material.

[0162] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A high-temperature insulating and corrosion-resistant lithium battery ceramic fiber paper, characterized in that: The ceramic fiber paper is composed of a ceramic fiber layer (1) and a ceramic layer (2), and the ceramic fiber layer (1) is firmly bonded to both sides of the ceramic layer (2). The ceramic fiber layer (1) is made of ceramic fiber modified with rare earth phosphate material, and the ceramic layer (2) is made of inorganic ceramic material prepared by carbon nanotube composite modification. The thickness of the ceramic fiber paper is 10μm-500μm to adapt to the design requirements of different lithium batteries. The thickness of the ceramic fiber layer (1) is 3μm-150μm, the thickness of the ceramic layer (2) is 4μm-200μm, and the thickness ratio of the ceramic fiber layer (1) to the ceramic layer (2) is 3:

4. The ceramic fiber layer (1) comprises the following components by weight: 8-12 parts rare earth phosphate material, 58-66 parts ceramic fiber, 1-5 parts dispersant, 1-3 parts binder and 2-8 parts pore-forming agent; The ceramic layer (2) comprises the following components by weight: 12-18 parts carbon nanotubes, 65-72 parts inorganic ceramic materials, 2-6 parts stabilizer and 2-5 parts surfactant; The raw materials for preparing the ceramic fiber layer (1) include rare earth phosphate materials, ceramic fibers, dispersants, binders and pore-forming agents. The ceramic fibers are one or more of alumina silicate fibers, zirconium-containing ceramic fibers or polycrystalline alumina fibers. The dispersants are one or more of sodium polyacrylate, sodium hexametaphosphate or sodium tripolyphosphate. The binders are one or more of polyvinyl alcohol, polyethylene glycol or carboxymethyl cellulose. The pore-forming agents are one or more of ammonium bicarbonate, urea or graphite powder. The raw materials for preparing the ceramic layer (2) include carbon nanotubes, inorganic ceramic materials, stabilizers and surfactants. The inorganic ceramic materials are one or more of alumina, silicon dioxide or zirconium oxide. The stabilizers are one or more of silicon carbide or tungsten carbide. The surfactants are one or more of silane coupling agents or aluminate coupling agents.

2. The method for preparing a high-temperature insulating and corrosion-resistant lithium battery ceramic fiber paper according to claim 1, characterized in that: The preparation steps of this high-temperature insulating and corrosion-resistant lithium battery ceramic fiber paper are as follows: Step S1: Prepare the raw materials for preparing the ceramic fiber layer (1) and the ceramic layer (2); Step S2: Add the raw materials for preparing the ceramic fiber layer (1) prepared in step S1 to the pulping machine, and fill the pulping machine with 20-28 parts of deionized water solution. Mix and pulp the pulping machine for 35-55 minutes to obtain a uniformly dispersed ceramic fiber slurry. Step S3: Pour the ceramic fiber slurry obtained in step S2 into the feed trough of the paper sheet forming machine to ensure uniform distribution of the solution. Start the paper sheet forming machine to make the ceramic fiber slurry form a uniform fiber layer on the forming wire. During the forming process, the fiber arrangement and pore formation are affected by controlling the forming speed and pressure. The formed fiber paper is removed from the forming wire and placed in a dryer for drying and curing treatment to obtain the required ceramic fiber layer (1). Step S4: Add the raw materials for preparing the ceramic layer (2) prepared in step S1 to the mixer, and fill the mixer with 30-35 parts of deionized water solution. Mix and stir the mixture for 35-55 minutes to obtain ceramic slurry. Step S5: The ceramic slurry prepared in step S4 is used to form a ceramic preform through a slurry casting process. Then, the ceramic preform is placed in a sintering furnace and sintered under the set sintering temperature and time conditions to ensure that the particles inside the ceramic layer (2) are fully combined to form a dense and stable ceramic layer (2) structure. Step S6: The prepared ceramic fiber layer (1) and ceramic layer (2) are stacked according to the design requirements, and the stacked composition is cured using a curing process. Step S7: Process the cured ceramic fiber paper, including cutting, trimming and edge sealing.

3. The method for preparing a high-temperature insulating and corrosion-resistant lithium battery ceramic fiber paper according to claim 2, characterized in that: In step S3, the sheet-making speed is 1m / min-2m / min, the pressure is 1.5m / min-2.5kPa, the drying temperature of the dryer is 70℃-85℃, and the drying time is 2h-3h.

4. The method for preparing a high-temperature insulating and corrosion-resistant lithium battery ceramic fiber paper according to claim 2, characterized in that: The slurry casting process in step S5 includes a porous gypsum mold. Ceramic slurry is injected into the porous gypsum mold, and under the capillary force of the porous gypsum mold, the water in the ceramic slurry is absorbed to form a dense preform structure. After the preform is formed, the porous gypsum mold is disassembled to remove the casting. After removing the excess material, it is naturally dried at room temperature to obtain a ceramic preform.

5. The method for preparing a high-temperature insulating and corrosion-resistant lithium battery ceramic fiber paper according to claim 2, characterized in that: The sintering process in step S5 is carried out in an inert atmosphere. The sintering temperature is adjusted according to the type of inorganic ceramic material and the amount of carbon nanotubes. The temperature is controlled at 170℃-190℃ to ensure that the ceramic layer (2) has the required density and microstructure. The inert atmosphere is nitrogen or argon.

6. The method for preparing a high-temperature insulating and corrosion-resistant lithium battery ceramic fiber paper according to claim 2, characterized in that: The layering in step S6 involves stacking the ceramic fiber layer (1) and the ceramic layer (2) in the order and number of layers required by the design.

7. The method for preparing a high-temperature insulating and corrosion-resistant lithium battery ceramic fiber paper according to claim 2, characterized in that: The curing process in step S6 uses ultraviolet curing or heat curing, with a curing temperature of 160℃-180℃ and a curing time of 15min-25min, to ensure that the laminated composition is completely cured and has the required mechanical strength.

8. The method for preparing a high-temperature insulating and corrosion-resistant lithium battery ceramic fiber paper according to claim 2, characterized in that: The processing in step S6 also includes edge sealing of the cut and trimmed ceramic fiber paper to prevent edge peeling or cracking during use. The edge sealing method is one of applying a sealant or laser welding.

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