Flame-retardant fire extinguishing material MILQIJ-1230 and preparation method, fire extinguishing flame-retardant patch and application

Abstract

This invention belongs to the field of new energy technology for the preparation of fire extinguishing materials for lithium-ion batteries, specifically involving the flame-retardant fire extinguishing material MILQIJ-1230 and its preparation method, as well as fire-retardant extinguishing patches and their applications. The raw materials for the flame-retardant fire extinguishing material MILQIJ-1230 include a porous metal-organic framework material MILQIJ, an organosilicon crosslinking agent, a curing agent, and perfluorohexanone. The chemical formula of the porous metal-organic framework material MILQIJ is [Al(OH)(trans-CDC)]·1.5H2O. The flame-retardant fire extinguishing material MILQIJ-1230 prepared by this invention is pressed into sheets to obtain the desired fire-retardant extinguishing patches, which can achieve rapid extinguishing of battery fires without damaging other normal batteries.

Description

Technical Field

[0001] This invention relates to the field of new energy technology for the preparation of fire extinguishing materials for lithium-ion batteries, specifically to the flame-retardant fire extinguishing material MILQIJ-1230 and its preparation method, as well as fire extinguishing flame-retardant patches and their applications. Background Technology

[0002] Lithium-ion battery energy storage, as an important means of large-scale energy regulation, can achieve functions such as smooth integration of new energy sources, peak shaving and valley filling, frequency and voltage regulation, and capacity reserve, playing a vital role in all aspects of the power system. Electricity-consuming enterprises can ensure stable power supply and also benefit from peak and valley electricity pricing by building lithium-ion battery storage stations. However, with the continuous increase in the capacity of energy storage batteries, higher energy release and more severe safety risks have resulted. In recent years, battery fires and explosions have occurred frequently, posing a more severe challenge to energy storage safety and fire safety. Safety is a crucial aspect of the development of the energy storage industry.

[0003] Currently, the fire extinguishing devices used for fires in user-side energy storage tanks are mainly suspended fire extinguishing devices. These have limited protection range, severely delayed response, and use heptafluoropropane gas as the extinguishing agent, employing a total flooding method. However, heptafluoropropane is unsuitable for lithium battery fires. Lithium battery fires are internal to external fires involving energetic materials, and heptafluoropropane has low cooling efficiency and cannot provide sustained cooling, failing to address the issue of easy reignition in lithium battery fires. Furthermore, user-side energy storage devices have limited space, and suspended fire extinguishing devices are too large, often posing installation location challenges and requiring smaller extinguishing tanks. This further limits the effectiveness of fire extinguishing devices in suppressing fires in user-side energy storage tanks.

[0004] Compared to heptafluoropropane, perfluorohexanone is a novel, clean, and highly efficient fire extinguishing agent with properties such as high dielectric constant, high electrical insulation, low surface tension, high thermal stability, and chemical inertness. In recent years, it has become increasingly widely used in extinguishing lithium battery fires. However, the use of perfluorohexanone still requires fire-fighting equipment. Developing a new fire extinguishing material based on the highly efficient fire-fighting properties of perfluorohexanone that can be used in energy storage systems without the need for fire-fighting equipment presents a challenging technological development challenge. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of existing technologies in handling lithium battery fires, such as the low cooling efficiency and inability to sustain cooling of heptafluoropropane gaseous extinguishing agents, which fail to solve the problem of easy reignition in lithium battery fires, and the limited effectiveness of fire extinguishing devices in extinguishing fires in user-side energy storage boxes. Therefore, this invention proposes the flame-retardant fire extinguishing material MILQIJ-1230, its preparation method, flame-retardant fire extinguishing patches, and their applications. First, the porous metal-organic framework material MILQIJ is coated and modified using an organosilicon crosslinking agent, thereby improving MILQIJ's adsorption capacity for perfluorohexanone. Finally, the modified MILQIJ is used to adsorb perfluorohexanone. The resulting flame-retardant fire extinguishing material MILQIJ-1230 not only possesses highly efficient fire extinguishing properties but also can be used in energy storage systems without the need for fire-fighting equipment.

[0006] The first aspect of this invention proposes a flame-retardant fire extinguishing material, MILQIJ-1230, whose raw materials include a porous metal-organic framework material, MILQIJ, an organosilicon crosslinking agent, a curing agent, and perfluorohexanone. The porous metal-organic framework material, MILQIJ, has the chemical formula [Al(OH)(trans-CDC)]·1.5H2O. The ratio of the porous metal-organic framework material, the organosilicon crosslinking agent, the curing agent, and the perfluorohexanone is 1g:0.1-0.2g:0.01-0.02g:80-120mL.

[0007] A second aspect of this invention provides a method for preparing the flame-retardant fire extinguishing material MILQIJ-1230, the method comprising the following steps:

[0008] (1) Mix the organosilicon crosslinking agent, curing agent and organic solvent to obtain an organosilicon solution, then mix the organosilicon solution with the porous metal-organic framework material MILQIJ, then perform ultrasonic treatment on the mixture, and then dry the ultrasonically treated product to obtain the coated and modified MILQIJ.

[0009] (2) The coated and modified MILQIJ is mixed with perfluorohexanone, and the mixture is subjected to ultrasonic treatment. The treated product is subjected to solid-liquid separation, and the solid phase obtained is the flame-retardant fire extinguishing material MILQIJ-1230. The chemical formula of the porous metal-organic framework material MILQIJ is [Al(OH)(trans-CDC)]·1.5H2O, and the ratio of the porous metal-organic framework material MILQIJ, the organosilicon crosslinking agent, the curing agent and the perfluorohexanone is 1g:0.1-0.2g:0.01-0.02g:80-120mL.

[0010] The third aspect of the present invention provides a fire extinguishing and flame retardant patch obtained by pressing the above-mentioned flame retardant fire extinguishing material MILQIJ-1230 into a sheet.

[0011] The fourth aspect of this invention proposes an application of the aforementioned fire-extinguishing and flame-retardant patch in user-side lithium battery energy storage.

[0012] The flame-retardant fire extinguishing material MILQIJ-1230, its preparation method, the flame-retardant fire extinguishing patch, and its application, as described in this invention, have the following beneficial effects:

[0013] (1) In this invention, an organosilicon crosslinking agent is used as a modifier, and a porous metal framework material MILQIJ is used as a substrate. The porous metal-organic framework material MILQIJ is coated and modified by solvent evaporation method to improve the adsorption capacity of MILQIJ for perfluorohexanone. Finally, the adsorption of perfluorohexanone by MILQIJ is achieved by immersion adsorption method to obtain a new type of flame-retardant fire extinguishing material MILQIJ-1230 suitable for user-side lithium battery energy storage.

[0014] (2) In this invention, the prepared flame-retardant fire extinguishing material MILQIJ-1230 is pressed into sheets to obtain the required fire extinguishing flame-retardant patch, which can achieve the effect of rapid extinguishing of battery fires and will not damage other normal batteries. Attached Figure Description

[0015] Figure 1 This is a SEM image of the porous metal-organic framework material MILQIJ in Example 1 of this invention;

[0016] Figure 2 This is the XRD pattern of the porous metal-organic framework material MILQIJ in Example 1 of this invention;

[0017] Figure 3 This is the N2 adsorption-desorption curve of the porous metal-organic framework material MILQIJ in Example 1 of the present invention;

[0018] Figure 4 This is a SEM image of the flame-retardant fire extinguishing material MILQIJ-1230 obtained in Example 1 of the present invention. Detailed Implementation

[0019] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0020] Metal-organic frameworks (MOFs) possess large specific surface areas, rich porous structures, and are easily functionalized, making them promising multifunctional carrier materials. In this patent, a porous MOF material, MILQIJ, was first prepared using AlCl3·6H2O and terephthalic acid as raw materials. Then, an organosilicon crosslinking agent was used as a modifying agent, and MILQIJ was coated and modified via solvent evaporation to enhance its adsorption capacity for perfluorohexanone. Finally, perfluorohexanone adsorption was achieved through an immersion adsorption method, resulting in a novel fire-extinguishing and flame-retardant material (MILQIJ-1230) suitable for user-side lithium battery energy storage. This material is then pressed into sheets to obtain the desired fire-extinguishing and flame-retardant patch, which can achieve rapid extinguishing of battery fires without damaging other normal batteries.

[0021] The first aspect of this invention proposes a flame-retardant fire extinguishing material, MILQIJ-1230, whose raw materials include a porous metal-organic framework material, MILQIJ, an organosilicon crosslinking agent, a curing agent, and perfluorohexanone. The porous metal-organic framework material, MILQIJ, has the chemical formula [Al(OH)(trans-CDC)]·1.5H2O. The ratio of MILQIJ, the organosilicon crosslinking agent, the curing agent, and the perfluorohexanone is 1g:0.1-0.2g:0.01-0.02g:80-120mL, for example, 1g:0.1g:0.01g:100mL, 1g:0.1g:0.02g:80mL, or 1g:0.2g:0.02g:120mL.

[0022] In the flame-retardant fire extinguishing material MILQIJ-1230 of this invention, in a specific embodiment, the porous metal-organic framework material MILQIJ is a porous material with a specific surface area of ​​300-500 m². 2 / g.

[0023] In the specific embodiment of the flame-retardant fire extinguishing material MILQIJ-1230 of the present invention, the preparation method of the porous metal-organic framework material MILQIJ includes: First, adding the metal salt AlCl3·6H2O (aluminum chloride hexahydrate) to a mixed aqueous solution composed of N,N-dimethylformamide (DMF) and deionized water, stirring to completely dissolve the aluminum chloride hexahydrate. During this process, the metal salt solid dissolves into metal ions, providing conditions for subsequent reactions. Then, adding the ligand terephthalic acid (H2CDC, solid) under stirring. Finally, transferring the mixed solution to a reaction vessel for heating, the metal ions and the terephthalic acid organic ligand undergo a coordination self-assembly reaction to produce the required porous MILQIJ material. The reaction product is collected by centrifugation, and the resulting white solid powder is the porous metal-organic framework material MILQIJ.

[0024] In the preparation of the porous metal-organic framework material MILQIJ, there are no special requirements for the amount of the mixed aqueous solution composed of N,N-dimethylformamide (DMF) and deionized water, as long as it can dissolve the metal salt AlCl3·6H2O.

[0025] In order to ensure high yield and uniform particle size of the prepared porous metal-organic framework material MILQIJ, in a specific embodiment, the molar ratio of terephthalic acid to AlCl3·6H2O is 1:1-2, for example, it can be 1:1, 1:1.5 or 1:2.

[0026] To accelerate the reaction rate, the heating conditions include a temperature of 100-150°C and a time of 8-16 hours.

[0027] In the above-mentioned technical solution for preparing porous metal-organic framework material MILQIJ, some solvent will remain in the pores of the final white solid powder. In order to completely evaporate the solvent remaining in the pores, the white solid powder is vacuum dried at 100-150℃ for 18-30h, and then stored in a dry environment for further use.

[0028] Using an organosilicon crosslinking agent as a modifier, and with porous metal-organic framework material MILQIJ as the substrate, the porous metal-organic framework material MILQIJ was coated and modified by solvent evaporation method to improve the adsorption capacity of MILQIJ for perfluorohexanone.

[0029] In the flame-retardant fire extinguishing material MILQIJ-1230 of the present invention, in a specific embodiment, in order to better coat and modify the porous metal skeleton material MILQIJ, the organosilicon crosslinking agent is polydimethylsiloxane.

[0030] In the process of coating and modifying the porous metal-organic framework material MILQIJ, a curing agent needs to be added in order to coat the crosslinking agent polydimethylsiloxane on the surface of MILQIJ. In a specific embodiment, the curing agent is one or more of epoxy resin, polyurethane and polysiloxane.

[0031] Perfluorohexanone possesses properties such as high dielectric constant, high electrical insulation, low surface tension, high thermal stability, and chemical inertness. In this invention, perfluorohexanone is adsorbed onto the modified porous metal-organic framework material MILQIJ using an immersion adsorption method, resulting in a novel fire extinguishing and flame retardant material, MILQIJ-1230, suitable for user-side lithium battery energy storage.

[0032] In the preferred embodiment of the flame-retardant fire extinguishing material MILQIJ-1230 of the present invention, in order to improve the fire extinguishing performance of the flame-retardant fire extinguishing material MILQIJ-1230 and better adapt it to user-side lithium battery energy storage, the ratio of the porous metal-organic framework material MILQIJ, the organosilicon crosslinking agent, the curing agent and the perfluorohexanone is 1g:0.1-0.2g:0.01-0.02g:80-120mL.

[0033] A second aspect of this invention provides a method for preparing the flame-retardant fire extinguishing material MILQIJ-1230, the method comprising the following steps:

[0034] (1) Mix the organosilicon crosslinking agent, curing agent and organic solvent to obtain an organosilicon solution, then mix the organosilicon solution with the porous metal-organic framework material MILQIJ, then perform ultrasonic treatment on the mixture, and then dry the ultrasonically treated product to obtain the coated and modified MILQIJ.

[0035] (2) The coated and modified MILQIJ is mixed with perfluorohexanone, and the mixture is subjected to ultrasonic treatment. The treated product is subjected to solid-liquid separation, and the solid phase obtained is the flame-retardant fire extinguishing material MILQIJ-1230. The chemical formula of the porous metal-organic framework material MILQIJ is [Al(OH)(trans-CDC)]·1.5H2O, and the ratio of the porous metal-organic framework material MILQIJ, the organosilicon crosslinking agent, the curing agent and the perfluorohexanone is 1g:0.1-0.2g:0.01-0.02g:80-120mL.

[0036] In the method described in this invention, the types and functions of the porous metal-organic framework material MILQIJ, the organosilicon crosslinking agent, the curing agent, and perfluorohexanone have been explained above and will not be repeated here.

[0037] In the method described in this invention, in step (1), the organosilicon crosslinking agent and curing agent are first dissolved in an organic solvent to form a solution, which facilitates the subsequent coating modification of the porous metal-organic framework material MILQIJ particles. Specifically, the organic solvent can be tetrahydrofuran and / or chloroform. Then, the dissolved organosilicon solution is mixed with the porous metal-organic framework material MILQIJ, and the coating modification of the porous metal-organic framework material MILQIJ is achieved by solvent evaporation. The mixed product is ultrasonically treated in an ultrasonic cleaner. After ultrasonic treatment, the turbid liquid is placed in a vacuum oven at 80-120°C for vacuum drying to obtain the coated and modified MILQIJ. Specifically, the ultrasonic treatment time is 10-40 min, and the vacuum drying conditions are: temperature 150-200°C, time 18-36 h.

[0038] In the method of the present invention, in step (1), in a specific embodiment, the mass ratio of the amount of the organosilicon crosslinking agent to the curing agent is 9-12:1.

[0039] In the method described in this invention, in step (1), in a specific embodiment, there are no special requirements for the amount of organic solvent used, as long as it can dissolve the organosilicon crosslinking agent and the curing agent.

[0040] In the method described in this invention, in step (1), if the crosslinking dosage is too low, the coating effect will be poor and the fire extinguishing performance will be affected; if the dosage is too high, the coating thickness will be too thick, affecting the release rate of perfluorohexanone inside during the fire extinguishing process, and thus affecting the fire extinguishing performance. In a specific embodiment, the mass ratio of the porous metal-organic framework material MILQIJ to the organosilicon crosslinking agent is 5-10:1.

[0041] In the method described in this invention, in step (2), in a specific embodiment, the adsorption of perfluorohexanone by the coated and modified MILQIJ is achieved by the immersion adsorption method. In order to fully utilize the porous MILQIJ to adsorb the maximum amount of perfluorohexanone, it is necessary to reasonably control the amount of coated and modified MILQIJ and perfluorohexanone. Specifically, the ratio of the amount of coated and modified MILQIJ to perfluorohexanone is 1g:80-120mL.

[0042] In the method described in this invention, in step (2), in a specific embodiment, the conditions for ultrasonic treatment are: temperature not exceeding 40°C to prevent the adsorbed perfluorohexanone from vaporizing and escaping, and time of 15-30 min.

[0043] In the method described in this invention, in step (2), in a specific embodiment, the product after ultrasonic treatment is filtered and the powder material is collected, which is the coated and modified MILQIJ.

[0044] The third aspect of the present invention provides a fire extinguishing and flame retardant patch obtained by pressing the above-mentioned flame retardant fire extinguishing material MILQIJ-1230 into a sheet.

[0045] Specifically, after the coated and modified MILQIJ powder material obtained above is left to stand at room temperature for 12 hours, a certain amount of powder material is weighed and placed into a tableting mold, and then pressed into a tablet using a tableting machine. The pressure of the tableting machine shall not exceed 2 MPa, thus obtaining the required fire extinguishing and flame retardant patch.

[0046] The fourth aspect of this invention proposes an application of the aforementioned fire-extinguishing and flame-retardant patch in user-side lithium battery energy storage.

[0047] In the application described in this invention, during actual operation, the prepared fire-extinguishing and flame-retardant patch is placed on the outer shell or inner shell of the lithium battery module in the user-side prefabricated compartment, or placed at any location within the prefabricated compartment near the lithium battery module. When a fire occurs in the lithium battery of the user-side lithium battery energy storage system, causing the temperature to rise, the perfluorohexanone adsorbed within the fire-extinguishing and flame-retardant patch will vaporize and be released, effectively reducing the surface temperature of the lithium battery and simultaneously inhibiting the oxidation reaction at the terminal combustion point, achieving the purpose of extinguishing or suppressing the lithium battery fire within 5 seconds. The released perfluorohexanone vaporizes during the fire extinguishing process, leaving no residue, and its excellent insulating properties prevent damage to other normal batteries.

[0048] The following examples further illustrate the flame-retardant fire extinguishing material MILQIJ-1230, its preparation method, fire-retardant extinguishing patches, and their applications according to the present invention. These examples are implemented based on the technical solution of the present invention, providing detailed implementation methods and specific operating procedures; however, the scope of protection of the present invention is not limited to the following examples.

[0049] Polydimethylsiloxane (purity > 99%, density 0.971 g / cm³) 3 )

[0050] Epoxy resin (purity greater than 99%, molecular weight 3500).

[0051] Example 1

[0052] Preparation of porous metal-organic framework material MILQIJ:

[0053] First, 1.448 g of the metal salt AlCl3·6H2O (aluminum chloride hexahydrate) was added to an N,N-dimethylformamide aqueous solution consisting of 32 mL of LDMF (N,N-dimethylformamide) and 8 mL of deionized water. The solution was stirred until completely dissolved to obtain a mixed solution. While stirring, 1.002 g of the ligand H2CDC (terephthalic acid, solid) was added and mixed. The mixture was then transferred to a reaction vessel and heated to 403 K in an oven for 12 h. After the reaction was complete, the white solid powder collected by centrifugation was identified as the porous metal-organic framework material MILQIJ. MILQIJ was dried in a vacuum oven at 403 K for 24 h to remove organic solvents. After drying, it was stored in a dry environment for further use. The scanning electron microscope (SEM) image, infrared spectrum, and N2 adsorption / desorption of the porous metal-organic framework material MILQIJ were obtained as shown in [reference needed]. Figure 1-3 The porous metal-organic framework material MILQIJ has a specific surface area of ​​400 m². 2 / g.

[0054] Preparation of flame-retardant fire extinguishing material MILQIJ-1230:

[0055] (1) Weigh 0.1g of polydimethylsiloxane (PDMS) and 0.01g of epoxy resin (curing agent) at a mass ratio of 10:1, dissolve them in 50mL of tetrahydrofuran to obtain an organosilicon solution, then weigh 1g of the porous metal-organic framework material MILQIJ solid powder prepared in Example 1 and add it to 50mL of the organosilicon solution, then place it in an ultrasonic cleaner and ultrasonically treat it for 15min, and then vacuum dry the turbid liquid at 180℃ for 24h to obtain the coated modified MILQIJ;

[0056] (2) Weigh 1g of coated modified MILQIJ and add it to 100mL of perfluorohexanone. After ultrasonic treatment for 20min (controlling the temperature not to exceed 398K), filter and collect the powder material. Let it stand at room temperature for 12h to obtain the flame retardant fire extinguishing material MILQIJ-1230.

[0057] Preparation of fire extinguishing and flame retardant patches: Weigh a certain amount of the flame retardant fire extinguishing material MILQIJ-1230 powder prepared in Example 1 and put it into a tableting mold. Use a tableting machine to press it into a tablet. The pressure of the tableting machine shall not exceed 2 MPa, and the desired fire extinguishing and flame retardant patch is obtained.

[0058] Application Example 1

[0059] The fire extinguishing and flame retardant patch prepared in Example 1 was placed on the outer shell and inner shell of the lithium battery module in the user-side prefabricated compartment. When a fire occurred in the lithium battery of the user-side lithium battery energy storage system, the temperature rose. The perfluorohexanone adsorbed in the fire extinguishing and flame retardant patch was vaporized and released, extinguishing the fire in 4 seconds. Normal battery components were not damaged.

[0060] Comparative Example 1

[0061] The process was carried out in accordance with Example 1, except that when preparing the flame-retardant fire extinguishing material MILQIJ-1230, the coating modification in step (1) was not performed. Instead, the porous metal-organic framework material MILQIJ was directly subjected to the operation in step (2) to obtain the flame-retardant fire extinguishing material A. The flame-retardant fire extinguishing material A was then made into a fire extinguishing and flame-retardant patch A.

[0062] Application Comparative Example 1

[0063] The fire extinguishing and flame retardant patch A prepared in Comparative Example 1 was placed on the outer shell and inner shell of the lithium battery module in the prefabricated cabin on the user side. A fire occurred in the lithium battery energy storage system on the user side, causing the temperature to rise. The fire was extinguished in 30 seconds, while other normal battery components were severely damaged.

[0064] Test case

[0065] The porous metal-organic framework material MILQIJ prepared in Example 1 was analyzed using scanning electron microscopy, infrared spectroscopy, and N2 adsorption / desorption assays. The results are as follows: Figure 1-3 .

[0066] Scanning electron microscopy (SEM) images of the flame-retardant fire extinguishing material MILQIJ-1230 prepared in Example 1 were obtained. The results are as follows: Figure 4 .

[0067] from Figure 1 It can be seen from this that the prepared MILQIJ particles have uniform size; from Figure 2 As can be seen, MILQIJ does not exhibit large peaks; its peak structure is fine and possesses rich spectral characteristics, indicating it is a crystalline material. Figure 3 It can be seen from this that the specific surface area of ​​MILQIJ is 400m². 2 / g, which indicates that MILQIJ is a porous material;

[0068] from Figure 4 It can be seen that the prepared flame-retardant fire extinguishing material MILQIJ-1230 particles agglomerate together, forming a good dense layer, which helps prevent the adsorbed perfluorohexanone from escaping.

[0069] The preferred embodiments of the present invention have been described in detail above; however, the present invention is not limited thereto. Within the scope of the inventive concept, various simple modifications can be made to the technical solutions of the present invention, including combining the various technical features in any other suitable manner. These simple modifications and combinations should also be considered as the content disclosed in the present invention and are all within the protection scope of the present invention.

Claims

1. A flame-retardant fire extinguishing material, MILQIJ-1230, characterized in that, Its raw materials include porous metal-organic framework material MILQIJ, organosilicon crosslinking agent, curing agent, and perfluorohexanone. The porous metal-organic framework material MILQIJ has the chemical formula [Al(OH)(trans-CDC)]·1.5H2O. The ratio of the porous metal-organic framework material MILQIJ, the organosilicon crosslinking agent, the curing agent, and the perfluorohexanone is 1g:0.1-0.2g:0.01-0.02g:80-120mL. The organosilicon crosslinking agent is polydimethylsiloxane. A method for preparing the flame-retardant fire extinguishing material MILQIJ-1230, characterized in that the method includes the following steps: (1) Mix the organosilicon crosslinking agent, curing agent and organic solvent to obtain an organosilicon solution, then mix the organosilicon solution with the porous metal-organic framework material MILQIJ, then perform ultrasonic treatment on the mixture, and then dry the ultrasonically treated product to obtain the coated and modified MILQIJ. (2) The coated and modified MILQIJ is mixed with perfluorohexanone, and the mixture is subjected to ultrasonic treatment. The treated product is subjected to solid-liquid separation, and the solid phase obtained is the flame-retardant fire extinguishing material MILQIJ-1230.

2. The flame-retardant fire extinguishing material MILQIJ-1230 according to claim 1, characterized in that, The curing agent is one or more of epoxy resin, polyurethane and polysiloxane.

3. The flame-retardant fire extinguishing material MILQIJ-1230 according to claim 1, characterized in that, The preparation method of the porous metal-organic framework material MILQIJ includes: mixing AlCl3·6H2O with an aqueous solution of N,N-dimethylformamide to obtain a mixed solution, mixing the mixed solution with terephthalic acid, heating the mixed product, and performing solid-liquid separation on the heated product to obtain the solid phase as the porous metal-organic framework material MILQIJ.

4. The flame-retardant fire extinguishing material MILQIJ-1230 according to claim 3, characterized in that, The molar ratio of the terephthalic acid to the AlCl3·6H2O is 1:1-2; and / or The heating conditions include: a temperature of 100-150℃ and a time of 8-16 hours.

5. The flame-retardant fire extinguishing material MILQIJ-1230 according to claim 1, characterized in that, The organic solvent is tetrahydrofuran and / or chloroform.

6. The flame-retardant fire extinguishing material MILQIJ-1230 according to claim 5, characterized in that, The preparation method of the porous metal-organic framework material MILQIJ includes: mixing AlCl3·6H2O with an aqueous solution of N,N-dimethylformamide to obtain a mixed solution, mixing the mixed solution with terephthalic acid, heating the mixed product, and performing solid-liquid separation on the heated product to obtain the solid phase as the porous metal-organic framework material MILQIJ.

7. The flame-retardant fire extinguishing material MILQIJ-1230 according to claim 6, characterized in that, The molar ratio of the terephthalic acid to the AlCl3·6H2O is 1:1-2; and / or The heating conditions include: a temperature of 100-150℃ and a time of 8-16 hours.

8. A fire extinguishing and flame retardant patch obtained by pressing the flame retardant fire extinguishing material MILQIJ-1230 according to any one of claims 1-7 into a sheet.

9. The application of the fire extinguishing and flame retardant patch as described in claim 8 in user-side lithium battery energy storage.

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