A heat-conduction enhanced rare earth-based solar cell heat dissipation backboard material and a preparation method thereof

Abstract

The application provides a heat-conduction enhanced rare earth-based solar cell heat-dissipation backboard material and a preparation method thereof, and belongs to the field of batteries. The battery heat-dissipation backboard material comprises the following raw materials in parts by weight: 47-55 parts of PET resin, 40-50 parts of LCA-PET masterbatch, 0.3-1 part of antioxidant and 0.2-2 parts of light stabilizer. The LCA-PET masterbatch comprises the following raw materials in parts by weight: 50-58 parts of PET resin, 32-37 parts of cationic sheet-like lanthanum cerium oxide, 6-10 parts of anionic aluminum nitride and 5-8 parts of dispersant. The heat-conduction enhanced rare earth-based solar cell heat-dissipation backboard material adopts micron-level sheet-like lanthanum cerium oxide and nano-aluminum nitride particles as raw materials, the sheet-like morphology of the lanthanum cerium oxide plays a role in improving reflection, and the nano-aluminum nitride particles play a role in connecting the sheet-like lanthanum cerium oxide, so that the material has the properties of high heat conduction, high reflection and high emission.

Description

Technical Field

[0001] This invention belongs to the field of batteries, and in particular relates to a thermally enhanced rare earth-based solar cell heat dissipation backsheet material and its preparation method. Background Technology

[0002] Solar cells are highly sensitive to temperature changes; high temperatures significantly reduce their photoelectric conversion efficiency and lifespan. Existing indirect cooling technologies suffer from problems such as large pressure drops, uneven heat transfer, and high energy consumption, while direct contact heat exchange technologies require high stability of the cooling medium. Currently, passive heat dissipation relies heavily on the high emissivity of materials but neglects their thermal conductivity, making it difficult for the material itself to quickly transfer heat from the heat source to the heat dissipation surface, thus affecting the heat dissipation rate. Summary of the Invention

[0003] In view of this, the present invention aims to overcome the defects in the prior art and proposes a thermally enhanced rare earth-based solar cell heat dissipation backsheet material and its preparation method.

[0004] To achieve the above objectives, the technical solution of the present invention is implemented as follows:

[0005] A thermally enhanced rare-earth-based solar cell heat dissipation backsheet material, comprising the following raw materials in parts by weight:

[0006] 47-55 parts PET resin, 40-50 parts LCA-PET masterbatch, 0.3-1 part antioxidant, and 0.2-2 parts light stabilizer;

[0007] The LCA-PET masterbatch comprises the following raw materials in parts by weight:

[0008] 50-58 parts PET resin, 32-37 parts cationic flake lanthanum cerium oxide, 6-10 parts anionic aluminum nitride, and 5-8 parts dispersant.

[0009] Furthermore, the cationic plate-like lanthanum cerium oxide is prepared by a method comprising the following steps:

[0010] Step 1 involves dispersing flake-shaped lanthanum and cerium oxide in deionized water and then ultrasonically dispersing it to obtain a lanthanum and cerium oxide dispersion.

[0011] Step 2 involves adding an aminosilane coupling agent to anhydrous ethanol, mixing thoroughly, and then obtaining the modified diluent.

[0012] Step 3 involves magnetically stirring the lanthanum oxide dispersion, adjusting the pH value, and adding the modified diluent dropwise under heating conditions. After the addition is complete, the reaction continues. After the reaction is complete, the mixture is cooled to room temperature, then centrifuged, washed, and vacuum dried to obtain amino-lanthanum oxide.

[0013] Step 4 involves adding the amino-containing lanthanum cerium oxide, α-diketone compounds, and aldehyde compounds to glacial acetic acid, subjecting the reaction to an ice-water bath, and then centrifuging, washing, and vacuum drying to obtain the cationic plate-like lanthanum cerium oxide.

[0014] Furthermore, in step 1, the solid-liquid ratio of the flaky lanthanum oxide to deionized water is 5g:100-300mL; in step 2, the solid-liquid ratio of the aminosilane coupling agent to anhydrous ethanol is 5g:50-100mL; in step 3, the volume ratio of the lanthanum oxide dispersion to the modified diluent is 1:0.25-0.5; the flaky lanthanum oxide is micron-sized, with a radial diameter of 20-50μm and a thickness of 200-500nm, wherein the molar ratio of La / Ce is 0.02-0.08.

[0015] Furthermore, the pH value in step 3 is adjusted to 4-6; the temperature in step 3 is 50-100℃; the temperature in step 3 is vacuum drying to 60-100℃; and deionized water is used in step 3.

[0016] Furthermore, in step 4, the molar ratio of lanthanum cerium oxide amino group, α-diketone compound, and aldehyde compound is 0.1-0.2:1:1; the α-diketone compound is at least one of butanedione, 2,3-pentanedione, or 2,3-hexanedione; and the aldehyde compound is at least one of propionaldehyde, n-butyraldehyde, or isobutyraldehyde.

[0017] Furthermore, the reaction time in step 4 is 10-15 hours; the temperature of the vacuum drying step in step 4 is 60-100℃; and ethanol is used in the washing step in step 4.

[0018] Furthermore, the anionic aluminum nitride is prepared by a method comprising the following steps:

[0019] Aluminum nitride and isopropylidene were added to a solvent and heated under reflux. After the reaction was completed, the mixture was separated, washed, and dried at low temperature to obtain the anionic aluminum nitride. The solvent was one of ethyl acetate, butyl acetate, toluene, and xylene.

[0020] Furthermore, the solid-liquid ratio of aluminum nitride, isopropylidene, and solvent is 1g:8-12g:40-100mL; the aluminum nitride is nanoscale with a particle size of 20-80nm; the solvent is at least one of ethyl acetate, butyl acetate, or xylene; the temperature of the heating reflux step is 75-100℃, and the time is 8-12 hours.

[0021] Flaky lanthanum cerium oxide itself possesses high reflectivity and high emissivity. When it is arranged in a flat state within resin, its reflectivity is further enhanced. However, its thermal conductivity is lower than some specialized high-conductivity materials. Therefore, aluminum nitride is introduced, while its small particle size is controlled to prevent the flat structure of the flaky material from having an impact. Aluminum nitride also participates in the construction of thermal conductive pathways, further improving the material's thermal conductivity. To enhance the interaction between the two fillers, cationic groups are introduced onto the surface of the flaky lanthanum cerium oxide, and anionic groups are introduced onto the surface of the aluminum nitride, creating electrostatic attraction between them and resulting in a tighter bond.

[0022] Furthermore, the aminosilane coupling agent is at least one of KH550, KH540, KH902 or KH554;

[0023] The antioxidant is at least one of PIANOX-1010, Irgafos 1010, AT-626 or PW-9225B;

[0024] The light stabilizer is at least one of RIASORB UV-292, Tinuvin 326, Neosynthetic 3638, or CYASORB UV2908;

[0025] The dispersant is at least one of AC540A, Licocare RBW 102 Vita, Licolub WE 40, or UNIQSPERSE610S.

[0026] The preparation method of the thermally enhanced rare-earth-based solar cell heat dissipation backsheet material includes the following steps:

[0027] Step 1 involves blending PET resin, cationic flake lanthanum cerium oxide, anionic aluminum nitride, and a dispersant to form a blend. The blend is then added to the mixture for melt extrusion and granulation to obtain LCA-PET masterbatch.

[0028] Step 2 involves melt-blending, extruding, and cooling PET resin, LCA-PET masterbatch, antioxidant, and light stabilizer to obtain a PET composite material.

[0029] Step 3 involves pasting PVDF films onto the front and back of the PET composite material to obtain the thermally enhanced rare-earth-based solar cell heat dissipation backsheet material.

[0030] The zone temperatures of the twin-screw extruder in the melt extrusion step of step 1 are as follows: conveying section 230-240℃, melting section 245-255℃, mixing section 245-255℃, venting section 260-270℃, homogenization section 260-270℃, die temperature 260-270℃, and feeding rate 230-270g / min.

[0031] The thickness of the PET composite material is 250-450 μm.

[0032] Compared with the prior art, the present invention has the following advantages:

[0033] The thermally enhanced rare-earth-based solar cell heat dissipation backsheet material of the present invention uses micron-sized sheet-like lanthanum oxide and nano-aluminum nitride particles as raw materials. The sheet-like morphology of lanthanum oxide and lanthanum oxide enhances reflection, while the material itself also has high emission performance. The nano-aluminum nitride particles connect the sheet-like lanthanum oxide and form a thermally conductive path, so that the material has high thermal conductivity, high reflection and high emission performance. Attached Figure Description

[0034] Figure 1 This is the temperature rise curve of the solar cell heat dissipation backplate described in an embodiment of the present invention. Detailed Implementation

[0035] Unless otherwise defined, the technical terms used in the following embodiments have the same meanings as commonly understood by those skilled in the art. Unless otherwise specified, the experimental reagents used in the following embodiments are conventional biochemical reagents; and the experimental methods described are conventional methods.

[0036] The present invention will be described in detail below with reference to embodiments.

[0037] Example 1

[0038] A method for preparing a thermally enhanced rare-earth-based solar cell heat dissipation backsheet material includes the following steps:

[0039] (1) Preparation of cationic plate-shaped lanthanum cerium oxide:

[0040] Weigh out 5g of flaky lanthanum cerium oxide (particle size D) 50=50μm, La / Ce molar ratio=0.06) was dispersed in 200mL of deionized water and ultrasonically dispersed for 30min to obtain a dispersion. 5gKH550 was added to 50mL of anhydrous ethanol to form a modified diluent. The dispersion was poured into a flask, magnetically stirred, and hydrochloric acid was added to adjust the pH to 5. The reaction temperature was 60℃. After the temperature stabilized, the modified diluent was slowly added dropwise to the system. After the addition was completed, the reaction continued for 12h. After the reaction was completed, the system was cooled to room temperature and then centrifuged. It was washed 5 times or more with deionized water. After washing, it was vacuum dried overnight at 60℃ to obtain amino lanthanum cerium oxide. 21.5g amino lanthanum cerium oxide, 86g butanedione, and 58g propionaldehyde were added to 100mL of glacial acetic acid and placed in an ice-water bath for 15h. After the reaction, the system was centrifuged at high speed and washed multiple times with ethanol. It was vacuum dried overnight at 60℃ to obtain cationic plate-like lanthanum cerium oxide.

[0041] (2) Preparation of anionic aluminum nitride:

[0042] Weigh 5g of aluminum nitride (particle size 50nm) and mix with 60g of isopropylidene ester. Add 450mL of ethyl acetate and reflux at 80℃ for 12h. After the reaction is completed, separate, wash and dry at low temperature to obtain anionic aluminum nitride.

[0043] (3) Preparation of LCA-PET masterbatch:

[0044] 52 parts of PET resin, 34 parts of cationic flake lanthanum cerium oxide, 7 parts of anionic aluminum nitride, and 7 parts of dispersant AC540A were mixed in a high-speed mixer to form a blend. The blend was then added to a twin-screw extruder for melt extrusion and granulation to obtain LCA-PET masterbatch. The temperatures of each section of the twin-screw extruder were 230, 250, 250, 265, and 265°C, the die temperature was 265°C, and the feeding rate was 240 g / min.

[0045] (4) 50 parts of PET resin, 48 parts of LCA-PET masterbatch, 0.8 parts of antioxidant PIANOX-1010 and 1.2 parts of light stabilizer RIASORB UV-292 were melt-blended and fed into an extruder and cast onto a cooling drum for rapid cooling to form a 300 μm thick PET composite film.

[0046] (5) Coat both sides of the PET composite material with glue to a thickness of 10μm, and then directly laminate the PVDF film (commercially available) onto both sides of the PET.

[0047] Example 2

[0048] A method for preparing a thermally enhanced rare-earth-based solar cell heat dissipation backsheet material includes the following steps:

[0049] (1) Preparation of cationic plate-shaped lanthanum cerium oxide:

[0050] Weigh out 5g of flaky lanthanum cerium oxide (particle size D) 50 =50μm, La / Ce molar ratio=0.03) was dispersed in 250mL of deionized water and ultrasonically dispersed for 30min to obtain a dispersion. 5g of aminosilane coupling agent KH540 was added to 75mL of anhydrous ethanol. The dispersion was poured into a flask, magnetically stirred, and hydrochloric acid was added to adjust the pH to 6. The reaction temperature was 80℃. After the temperature stabilized, the modified diluent was slowly added dropwise to the system. After the addition was completed, the reaction continued for 8h. After the reaction was completed, the system was cooled to room temperature and then centrifuged. It was washed 5 times or more with deionized water. After washing, it was vacuum dried overnight at 80℃ to obtain amino lanthanum cerium oxide. 26g of amino lanthanum cerium oxide, 100g of 2,3-pentanedione, and 72g of n-butyraldehyde were added to 100mL of glacial acetic acid and placed in an ice-water bath for 10h. After the reaction, the system was centrifuged at high speed and washed multiple times with ethanol. It was vacuum dried overnight at 100℃ to obtain cationic plate-like lanthanum cerium oxide.

[0051] (2) Preparation of anionic aluminum nitride:

[0052] Weigh 5g of aluminum nitride (particle size 80nm) and mix with 40g of isopropylidene, add 300mL of xylene, reflux at 95℃ for 9h, and after the reaction is completed, separate, wash and dry at low temperature to obtain anionic aluminum nitride.

[0053] (3) Preparation of LCA-PET masterbatch:

[0054] 56 parts of PET resin, 32 parts of cationic flake lanthanum cerium oxide, 6 parts of anionic aluminum nitride, and 6 parts of dispersant LicocareRBW 102 Vita were mixed in a high-speed mixer to form a blend. The blend was then added to a twin-screw extruder for melt extrusion and granulation to obtain LCA-PET masterbatch. The temperatures of each section of the twin-screw extruder were 240, 255, 255, 270, and 270°C, the die temperature was 270°C, and the feed rate was 260 g / min.

[0055] (4) 54 parts of PET resin, 43.5 parts of LCA-PET masterbatch, 1 part of antioxidant AT-626 and 1.5 parts of light stabilizer Tinuvin326 were melt-blended, fed into an extruder and cast onto a cooling drum for rapid cooling to form a 300μm thick PET composite film.

[0056] (5) Coat both sides of the PET composite material with glue to a thickness of 10μm, and then directly laminate the PVDF film (commercially available) onto both sides of the PET.

[0057] Comparative Example 1

[0058] A method for preparing a heat dissipation backsheet material for solar cells includes the following steps:

[0059] (1) Preparation of anionic aluminum nitride:

[0060] Weigh 5g of aluminum nitride (particle size 80nm) and mix with 40g of isopropylidene, add 300mL of xylene, reflux at 95℃ for 9h, and after the reaction is completed, separate, wash and dry at low temperature to obtain anionic aluminum nitride.

[0061] (2) Preparation of LCA-PET masterbatch:

[0062] 56 parts of PET resin, 6 parts of anionic aluminum nitride, and 6 parts of dispersant Licocare RBW 102 Vita were mixed in a high-speed mixer to form a blend. The blend was then added to a twin-screw extruder for melt extrusion and granulation to obtain LCA-PET masterbatch. The temperatures of each section of the twin-screw extruder were 240, 255, 255, 270, and 270°C, the die temperature was 270°C, and the feed rate was 260 g / min.

[0063] (3) 54 parts of PET resin, 43.5 parts of LCA-PET masterbatch, 1 part of antioxidant AT-626 and 1.5 parts of light stabilizer Tinuvin326 were melt-blended, fed into an extruder and cast onto a cooling drum for rapid cooling to form a 300μm thick PET composite film.

[0064] (4) Coat both sides of the PET composite material with glue to a thickness of 10μm, and then directly laminate the PVDF film (commercially available) onto both sides of the PET.

[0065] Comparative Example 2

[0066] A method for preparing a rare-earth-based solar cell heat dissipation backsheet material includes the following steps:

[0067] (1) Preparation of cationic lanthanum cerium oxide:

[0068] Weigh out 5g of lanthanum cerium oxide with no special morphology (particle size D). 50=50μm, La / Ce molar ratio=0.03) was dispersed in 250mL of deionized water and ultrasonically dispersed for 30 min to obtain a dispersion. 5g of the dispersion was then added to 75mL of anhydrous ethanol. Aminosilane coupling agent KH540 was used to form a modified diluent. The dispersion was poured into a flask, magnetically stirred, and hydrochloric acid was added to adjust the pH to 6. The reaction temperature was 80℃. After the temperature stabilized, the modified diluent was slowly added dropwise to the system. After the addition was complete, the reaction continued for 8 hours. After the reaction was complete, the system was cooled to room temperature and then centrifuged. The system was washed with deionized water 5 times or more. After washing, it was vacuum dried overnight at 80℃ to obtain amino lanthanum cerium oxide. 26g of amino lanthanum cerium oxide, 100g of 2,3-pentanedione, and 72g of n-butyraldehyde were added to 100mL of glacial acetic acid and placed in an ice-water bath for 10 hours. After the reaction, the system was centrifuged at high speed and washed multiple times with ethanol. It was then vacuum dried overnight at 100℃ to obtain cationic plate-like lanthanum cerium oxide.

[0069] (2) Preparation of anionic aluminum nitride:

[0070] Weigh 5g of aluminum nitride (particle size 80nm) and mix with 40g of isopropylidene, add 300mL of xylene, reflux at 95℃ for 9h, and after the reaction is completed, separate, wash and dry at low temperature to obtain anionic aluminum nitride.

[0071] (3) Preparation of LCA-PET masterbatch:

[0072] 56 parts of PET resin, 32 parts of cationic flake lanthanum cerium oxide, 6 parts of anionic aluminum nitride, and 6 parts of dispersant LicocareRBW 102 Vita were mixed in a high-speed mixer to form a blend. The blend was then added to a twin-screw extruder for melt extrusion and granulation to obtain LCA-PET masterbatch. The temperatures of each section of the twin-screw extruder were 240, 255, 255, 270, and 270°C, the die temperature was 270°C, and the feed rate was 260 g / min.

[0073] (4) 54 parts of PET resin, 43.5 parts of LCA-PET masterbatch, 1 part of antioxidant AT-626 and 1.5 parts of light stabilizer Tinuvin326 were melt-blended, fed into an extruder and cast onto a cooling drum for rapid cooling to form a 300μm thick PET composite film.

[0074] (5) Coat both sides of the PET composite material with glue to a thickness of 10μm, and then directly laminate the PVDF film (commercially available) onto both sides of the PET.

[0075] Comparative Example 3

[0076] A method for preparing a rare-earth-based solar cell heat dissipation backsheet material includes the following steps:

[0077] (1) Preparation of cationic plate-shaped lanthanum cerium oxide:

[0078] Weigh out 5g of flaky lanthanum cerium oxide (particle size D) 50 =50μm, La / Ce molar ratio=0.03) was dispersed in 250mL of deionized water and ultrasonically dispersed for 30min to obtain a dispersion. 5g KH540 was added to 75mL of anhydrous ethanol to form a modified diluent. The dispersion was poured into a flask, magnetically stirred, and hydrochloric acid was added to adjust the pH to 6. The reaction temperature was 80℃. After the temperature stabilized, the modified diluent was slowly added dropwise to the system. After the addition was completed, the reaction continued for 8h. After the reaction was completed, the system was cooled to room temperature and then centrifuged. It was washed 5 times or more with deionized water. After washing, it was vacuum dried overnight at 80℃ to obtain amino lanthanum cerium oxide. 26g amino lanthanum cerium oxide, 100g 2,3-pentanedione, and 72g n-butyraldehyde were added to 100mL of glacial acetic acid and placed in an ice-water bath for 10h. After the reaction, the system was centrifuged at high speed and washed multiple times with ethanol. It was vacuum dried overnight at 100℃ to obtain cationic plate-like lanthanum cerium oxide.

[0079] (2) Preparation of LCA-PET masterbatch:

[0080] 56 parts of PET resin, 32 parts of cationic flake lanthanum cerium oxide, and 6 parts of dispersant Licocare RBW102Vita were mixed in a high-speed mixer to form a blend. The blend was then added to a twin-screw extruder for melt extrusion and granulation to obtain LCA-PET masterbatch. The temperatures of each section of the twin-screw extruder were 240, 255, 255, 270, and 270°C, the die temperature was 270°C, and the feed rate was 260 g / min.

[0081] (3) 54 parts of PET resin, 43.5 parts of LCA-PET masterbatch, 1 part of antioxidant AT-626 and 1.5 parts of light stabilizer Tinuvin326 were melt-blended, fed into an extruder and cast onto a cooling drum for rapid cooling to form a 300μm thick PET composite film.

[0082] (4) Coat both sides of the PET composite material with glue to a thickness of 10μm, and then directly laminate the PVDF film (commercially available) onto both sides of the PET.

[0083] Comparative Example 4

[0084] A method for preparing a rare-earth-based solar cell heat dissipation backsheet material includes the following steps:

[0085] (1) Preparation of LCA-PET masterbatch:

[0086] 56 parts of PET resin, 32 parts of flake lanthanum cerium oxide (La / Ce molar ratio = 0.03), 6 parts of aluminum nitride, and 6 parts of dispersant Licocare RBW 102 Vita were mixed in a high-speed mixer to form a blend. The blend was then fed into a twin-screw extruder for melt extrusion and granulation to obtain LCA-PET masterbatch. The temperatures of each section of the twin-screw extruder were 240, 255, 255, 270, and 270°C, the die temperature was 270°C, and the feed rate was 260 g / min.

[0087] (2) 54 parts of PET resin, 43.5 parts of LCA-PET masterbatch, 1 part of antioxidant AT-626 and 1.5 parts of light stabilizer Tinuvin326 were melt-blended and fed into an extruder and cast onto a cooling drum for rapid cooling to form a 300μm thick PET composite film.

[0088] (3) Coat both sides of the PET composite material with glue to a thickness of 10μm, and then directly laminate the PVDF film (commercially available) onto both sides of the PET.

[0089] Thermal conductivity and emissivity were measured for Examples 1-2 and Comparative Examples 1-4 provided by the present invention, and the results are shown in Table 1.

[0090] Table 1 Emissivity Data

[0091]

[0092] As shown in Table 1, the thermal conductivity of the heat dissipation backplates of the thermally enhanced rare-earth-based solar cells provided in Examples 1-2 of the present invention is around 1.6 W / mK, the reflectivity is above 93%, and the emissivity is above 95%.

[0093] Compared to Example 2, Comparative Example 1, by removing the filler lanthanum cerium oxide, showed a significant decrease in thermal conductivity, reflectivity, and emissivity, indicating that lanthanum cerium oxide plays a crucial role in these three aspects of performance in the backplate material. Compared to Example 2, Comparative Example 2, by replacing the sheet-like lanthanum cerium oxide with lanthanum cerium oxide without a specific morphology, showed a 12% decrease in reflectivity and a 0.55 W / mK decrease in thermal conductivity, indicating that the sheet-like morphology of lanthanum cerium oxide not only improves the material's reflectivity but also contributes to the construction of thermal conductivity pathways. Compared to Example 2, Comparative Example 3, by removing the filler nano-aluminum nitride particles, showed a significant decrease in thermal conductivity, indicating that aluminum nitride particles enhance the material's thermal conductivity. Compared to Example 1, Comparative Example 4, with no cations or anions on the surface of both the filler lanthanum cerium oxide and aluminum nitride, showed a 0.27 W / mK decrease in thermal conductivity, indicating that cation and anion modification also contributes to the construction of thermal conductivity pathways, mainly by making the two materials more tightly bonded.

[0094] The heat dissipation performance evaluation of the solar cell heat dissipation backsheet described in this invention was conducted outdoors under sunlight. The backsheet was placed on the bottom of a small solar cell, and the temperature change of the solar cell was recorded in real time. The heating process of the backsheet in the embodiments or comparative examples is as follows: Figure 1 As shown, Examples 1-2 all exhibit lower surface temperatures under outdoor conditions, reducing the surface temperature by approximately 10°C compared to Comparative Example 1. Comparative Examples 2-4 also reduce the temperature by 3-5°C, but the cooling effect is far less than that of Examples 1-2, indicating that the thermally enhanced rare-earth-based solar cell heat dissipation backplate described in this invention has excellent heat dissipation performance.

[0095] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A thermally enhanced rare-earth-based solar cell heat dissipation backsheet material, characterized in that: The battery heat dissipation backplate material comprises the following raw materials in parts by weight: 47-55 parts PET resin, 40-50 parts LCA-PET masterbatch, 0.3-1 part antioxidant, and 0.2-2 parts light stabilizer; The LCA-PET masterbatch comprises the following raw materials in parts by weight: 50-58 parts of PET resin, 32-37 parts of cationic flake lanthanum cerium oxide, 6-10 parts of anionic aluminum nitride, and 5-8 parts of dispersant; The aforementioned cationic plate-shaped lanthanum cerium oxide is prepared by a method comprising the following steps: Step 1 involves dispersing flake-shaped lanthanum and cerium oxide in deionized water and then ultrasonically dispersing it to obtain a lanthanum and cerium oxide dispersion. Step 2 involves adding an aminosilane coupling agent to anhydrous ethanol, mixing thoroughly, and then obtaining the modified diluent. Step 3 involves magnetically stirring the lanthanum oxide dispersion, adjusting the pH value, and adding the modified diluent dropwise under heating conditions. After the addition is complete, the reaction continues. After the reaction is complete, the mixture is cooled to room temperature, then centrifuged, washed, and vacuum dried to obtain amino-lanthanum oxide. Step 4 involves adding the amino-containing lanthanum cerium oxide, α-diketone compounds, and aldehyde compounds to glacial acetic acid, subjecting the reaction to an ice-water bath, and then centrifuging, washing, and vacuum drying to obtain the cationic sheet-like lanthanum cerium oxide. The aforementioned anionic aluminum nitride is prepared by a method comprising the following steps: Aluminum nitride and isopropylidene ester were added to a solvent and heated under reflux. After the reaction was completed, the mixture was separated, washed, and dried at low temperature to obtain the anionic aluminum nitride. The solvent was one of ethyl acetate, butyl acetate, toluene, and xylene.

2. The thermally enhanced rare-earth-based solar cell heat dissipation backsheet material according to claim 1, characterized in that: In step 1, the solid-liquid ratio of lanthanum cerium oxide flakes to deionized water is 5g:100-300mL; in step 2, the solid-liquid ratio of aminosilane coupling agent to anhydrous ethanol is 5g:50-100mL; in step 3, the volume ratio of lanthanum cerium oxide dispersion to modified diluent is 1:0.25-0.5; the lanthanum cerium oxide flakes are micron-sized, with a radial diameter of 20-50 μm and a thickness of 200-500 nm, wherein the molar ratio of La to Ce is 0.02-0.

08.

3. The thermally enhanced rare-earth-based solar cell heat dissipation backsheet material according to claim 1, characterized in that: The pH value in step 3 is adjusted to 4-6; the temperature in step 3 is 50-100℃; the temperature in step 3 is vacuum drying to 60-100℃; and deionized water is used in step 3.

4. The thermally enhanced rare-earth-based solar cell heat dissipation backsheet material according to claim 1, characterized in that: In step 4, the molar ratio of amino-lanthanum cerium oxide, α-diketone compound, and aldehyde compound is 0.1-0.2:1:1; the α-diketone compound is at least one of butanedione, 2,3-pentanedione, or 2,3-hexanedione; and the aldehyde compound is at least one of propionaldehyde, n-butyraldehyde, or isobutyraldehyde.

5. The thermally enhanced rare-earth-based solar cell heat dissipation backsheet material according to claim 1, characterized in that: The reaction time in step 4 is 10-15 hours; the temperature of the vacuum drying step in step 4 is 60-100℃; and ethanol is used in the washing step in step 4.

6. The thermally enhanced rare-earth-based solar cell heat dissipation backsheet material according to claim 1, characterized in that: The solid-liquid ratio of aluminum nitride, isopropylidene, and solvent is 1g:8-12g:40-100mL; the aluminum nitride is nanoscale with a particle size of 20-80 nm; the solvent is at least one of ethyl acetate, butyl acetate, or xylene; the temperature of the heating reflux step is 75-100℃, and the time is 8-12 hours.

7. The thermally enhanced rare-earth-based solar cell heat dissipation backsheet material according to claim 1, characterized in that: The aminosilane coupling agent is at least one of KH550, KH540, KH902 or KH554; The antioxidant is at least one of PIANOX-1010, Irgafos 1010, AT-626 or PW-9225B; The light stabilizer is at least one of RIASORB UV-292, Tinuvin 326, Neosynthetic 3638, or CYASORB UV2908; The dispersant is at least one of AC540A, Licocare RBW 102 Vita, Licolub WE 40, or UNIQSPERSE 610S.

8. The method for preparing the thermally enhanced rare-earth-based solar cell heat dissipation backsheet material according to any one of claims 1-7, characterized in that: Includes the following steps: Step 1 involves blending PET resin, cationic flake lanthanum cerium oxide, anionic aluminum nitride, and a dispersant to form a blend. The blend is then added to the mixture for melt extrusion and granulation to obtain LCA-PET masterbatch. Step 2 involves melt-blending, extruding, and cooling PET resin, LCA-PET masterbatch, antioxidant, and light stabilizer to obtain a PET composite material. Step 3 involves pasting PVDF films onto the front and back of the PET composite material to obtain the thermally enhanced rare-earth-based solar cell heat dissipation backsheet material. The zone temperatures of the twin-screw extruder in the melt extrusion step of step 1 are as follows: conveying section 230-240℃, melting section 245-255℃, mixing section 245-255℃, venting section 260-270℃, homogenization section 260-270℃, die temperature 260-270℃, and feeding rate 230-270 g / min. The thickness of the PET composite material is 250-450 μm.

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