CN111234424A - Flaky boron nitride/polyvinylidene fluoride composite material and preparation method thereof - Google Patents

Flaky boron nitride/polyvinylidene fluoride composite material and preparation method thereof Download PDF

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CN111234424A
CN111234424A CN202010162523.1A CN202010162523A CN111234424A CN 111234424 A CN111234424 A CN 111234424A CN 202010162523 A CN202010162523 A CN 202010162523A CN 111234424 A CN111234424 A CN 111234424A
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boron nitride
polyvinylidene fluoride
composite material
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CN111234424B (en
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王卓
孔梦蕾
王枭颖
李银博
范家豪
易志辉
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Shaanxi University of Science and Technology
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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K9/00—Use of pretreated ingredients
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/38—Boron-containing compounds
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K7/00—Use of ingredients characterised by shape
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/38—Boron-containing compounds
    • C08K2003/382—Boron-containing compounds and nitrogen
    • C08K2003/385—Binary compounds of nitrogen with boron

Abstract

The invention relates to a sheet boron nitride/polyvinylidene fluoride composite material and a preparation method thereof, wherein the method comprises the following steps of 1, uniformly dispersing polyvinylidene fluoride in an organic solvent to obtain a polyvinylidene fluoride solution; adding flaky boron nitride into an organic solvent, and sequentially carrying out ultrasonic and magnetic stirring to obtain a boron nitride solution, wherein the ratio of the volume of the flaky boron nitride to the total volume of the polyvinylidene fluoride and the flaky boron nitride is 1-4%; step 2, adding the boron nitride solution into the polyvinylidene fluoride solution, and then sequentially carrying out ultrasonic and magnetic stirring at the temperature of 43-46 ℃; and 3, preparing a boron nitride/polyvinylidene fluoride composite by using a tape casting method, drying to obtain a composite A, drying the composite A at 180-220 ℃ for 5-10 min, and quenching to obtain a flaky boron nitride/polyvinylidene fluoride composite material, so that the high loss of space charge is reduced, the breakdown field strength is increased, and the flaky BN and PVDF composite material obtains a large energy storage density.

Description

Flaky boron nitride/polyvinylidene fluoride composite material and preparation method thereof
Technical Field
The invention relates to the technical field of preparation of polymer-based composite materials with high dielectric and high energy storage, in particular to a flaky boron nitride/polyvinylidene fluoride composite material and a preparation method thereof.
Background
The dielectric composite material formed by the high dielectric ceramic-polymer has important significance for the energy storage material, and the composite material with high dielectric constant and high breakdown field strength is prepared by the high dielectric ceramic with high dielectric constant and the polymer with high breakdown field strength, so that the large energy storage density is obtained.
In recent years, research on two-dimensional lamellar fillers is also a hot spot, and the lamellar structure is generally considered to have a space blocking effect, so that the electric tree in a substrate can be effectively prevented from expanding, a conductive path is more bent, and the loss of space charges and partial discharge are hindered, so that the breakdown field strength is increased.
Boron nitride (chemical formula is BN) is a high-dielectric ceramic, belongs to two-dimensional sheet filler, and can form a dielectric composite material with polyvinylidene fluoride (abbreviated as PVDF) so as to obtain a composite material with certain energy storage density, but the energy storage density of the currently reported composite material of boron nitride and polyvinylidene fluoride still needs to be improved.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a flaky boron nitride/polyvinylidene fluoride composite material and a preparation method thereof, the process is simple, the cost is low, the reaction period is short, the repeatability is good, and the prepared flaky boron nitride/polyvinylidene fluoride composite material has high breakdown field strength and high energy storage density.
The invention is realized by the following technical scheme:
a preparation method of a sheet-shaped boron nitride/polyvinylidene fluoride composite material comprises the following steps,
step 1, uniformly dispersing polyvinylidene fluoride in an organic solvent to obtain a polyvinylidene fluoride solution;
adding flaky boron nitride into an organic solvent, and sequentially carrying out ultrasonic and magnetic stirring to obtain a boron nitride solution, wherein the ratio of the volume of the flaky boron nitride to the total volume of the polyvinylidene fluoride and the flaky boron nitride is 1-4%;
step 2, adding the boron nitride solution into the polyvinylidene fluoride solution, and then sequentially carrying out ultrasonic and magnetic stirring at the temperature of 43-46 ℃ to obtain a mixed system;
and 3, preparing a boron nitride/polyvinylidene fluoride compound from the mixed system by using a tape casting method, drying the boron nitride/polyvinylidene fluoride compound to obtain a compound A, drying the compound A at 180-220 ℃ for 5-10 min, and quenching to obtain the flaky boron nitride/polyvinylidene fluoride composite material.
Preferably, in step 1, the organic solvent is DMF.
Preferably, in the step 1, the ratio of the polyvinylidene fluoride to the organic solvent in preparing the polyvinylidene fluoride solution is (0.49-0.52) g: (3.5-4) mL.
Further, in the step 1, adding the flaky boron nitride into an organic solvent, performing ultrasonic treatment for 0.5-1 h, and performing magnetic stirring for 0.5-1 h to obtain a boron nitride solution, wherein the volume ratio of the organic solvent to the organic solvent in the preparation of the polyvinylidene fluoride solution is (1-1.5): (3.5-4).
Further, when preparing the boron nitride solution, ultrasonic and magnetic stirring are alternately carried out, and the repetition time is 3-5 times.
Preferably, when the mixed system is prepared in the step 2, ultrasonic stirring and magnetic stirring are alternately carried out, and the repetition time is 4-6 times.
Furthermore, when the ultrasonic stirring and the magnetic stirring are alternately carried out, the time of each ultrasonic stirring is 0.5-1 h, and the time of each magnetic stirring is 4-6 h.
Preferably, in the step 3, the boron nitride/polyvinylidene fluoride compound is dried for 10-12 hours at the temperature of 100-105 ℃.
Preferably, in the step 3, the compound A is dried and then quenched by ice water with the temperature of 2-10 ℃.
A flaky boron nitride/polyvinylidene fluoride composite material prepared by the preparation method of the flaky boron nitride/polyvinylidene fluoride composite material.
Compared with the prior art, the invention has the following beneficial technical effects:
the invention relates to a preparation method of a flaky boron nitride/polyvinylidene fluoride composite material, which comprises the steps of carrying out ultrasonic and magnetic stirring on flaky boron nitride in an organic solvent, reducing the agglomeration of BN (boron nitride), enabling the BN to be uniformly dispersed, then carrying out ultrasonic and magnetic stirring with polyvinylidene fluoride at a certain temperature in sequence, further reducing the agglomeration of BN, enabling the BN to be more uniformly dispersed in the polyvinylidene fluoride, preparing a boron nitride/polyvinylidene fluoride composite by a tape casting method, then carrying out drying twice, and carrying out quenching to increase the toughness of the obtained film, thereby finally obtaining the textured polymer matrix composite material with high energy storage. The BN nanosheet is introduced and appropriately heated, which is equivalent to the introduction of an effective electron trap, so that the tunneling of electrons through a filler/matrix interface is limited, the path curvature of an electric tree in the breakdown process is increased, the improvement of the energy storage efficiency is facilitated, and the movement of charges to two ends of an electrode can be effectively prevented by the interface generated by the heated BN nanosheet in a PVDF matrix, so that the high loss of space charges is reduced, the breakdown field strength is increased, and the flaky BN and PVDF composite material obtains large energy storage density.
Drawings
FIG. 1 is a graph showing dielectric constant curves of BN/PVDF prepared in examples 1 to 5 of the present invention and comparative example 1.
FIG. 2 is a graph showing dielectric loss curves of BN/PVDF prepared in examples 1 to 5 of the present invention and comparative example 1.
FIG. 3 is a plot of hysteresis loops of BN/PVDF prepared in examples 1 to 5 of the present invention and comparative example 1.
FIG. 4 is a graph showing the energy storage density curve and the energy storage efficiency curve of BN/PVDF prepared in examples 1 to 5 of the present invention and comparative example 1.
Detailed Description
The present invention will now be described in further detail with reference to specific examples, which are intended to be illustrative, but not limiting, of the invention.
The invention relates to a preparation method of a sheet-shaped boron nitride/polyvinylidene fluoride composite material, which comprises the following steps,
step 1, weighing 0.49-0.52 g of PVDF, adding the PVDF into 3.5-4 mL of DMF, stirring for 3-4 h, and uniformly mixing, wherein other organic solvents can be replaced to obtain a PVDF solution;
converting the PVDF into volume, respectively weighing a certain mass of BN nano sheets, enabling the ratio of the volume of the BN nano sheets to the total volume of the BN nano sheets to the PVDF to be 1%, 2%, 3% and 4% in sequence, adding the BN nano sheets into 1-1.5 mL of DMF, carrying out ultrasonic treatment for 0.5-1 h, then carrying out magnetic stirring for 0.5-1 h, repeating for 3-5 times, reducing agglomeration of BN, and enabling the BN to be uniformly dispersed, thereby obtaining a BN solution;
step 2, adding the BN solution into the PVDF solution respectively, and alternately carrying out ultrasonic and magnetic stirring for 4-6 times at the temperature of 43-46 ℃ under the condition of water bath heating, wherein the time of each ultrasonic is 0.5-1 h, and the time of each magnetic stirring is 4-6 h, so that the agglomeration of BN is further reduced, and the dispersion of the BN is more uniform;
step 3, preparing a boron nitride/polyvinylidene fluoride compound by a tape casting method, and drying the compound for 10-12 hours at the temperature of 100-105 ℃ to obtain a dried film;
and 4, putting the dried film into a vacuum drying oven, drying at 180-220 ℃ for 5-10 min, quenching with ice water at 2-10 ℃ to increase the toughness of the film, storing the ice water in a refrigerating chamber of the refrigerator for more than 12h, and finally drying to obtain the high-energy-storage textured polymer matrix composite.
Example 1, BN/PVDF, with a volume fraction of BN of 1%,
the invention relates to a preparation method of a sheet-shaped boron nitride/polyvinylidene fluoride composite material, which comprises the following steps,
step 1, weighing 0.5g of PVDF, adding 4mL of DMF solution, and stirring for 4 h; weighing BN nano-sheets with the volume ratio of 1 percent, adding the BN nano-sheets into 1mL of DMF, carrying out ultrasonic treatment for 0.5h, stirring for 0.5h, and repeating for 5 times;
step 2, respectively adding 1% BN solution into the PVDF solution, and alternately carrying out ultrasonic and magnetic stirring for 4 times at 43 ℃, wherein the ultrasonic time is 0.5h each time, and the magnetic stirring time is 4h each time;
step 3, preparing a boron nitride/polyvinylidene fluoride compound by a tape casting method, and drying for 12 hours at the temperature of 100 ℃ to obtain a dried film;
and 4, putting the dried membrane into a vacuum drying oven, drying for 7 minutes at 200 ℃, quenching with ice water at 2 ℃, and finally drying to obtain the BN/PVDF composite material.
From FIG. 1, it can be seen that the dielectric constant of 1% BN/PVDF is about 14 at 100 Hz. From FIG. 2 it can be seen that the dielectric loss of 1% BN/PVDF is about 0.08 at 100 Hz. From FIG. 3 it can be seen that the breakdown strength of 1% BN/PVDF is 460 kV/mm. From FIG. 4, it can be seen that the energy storage density of pure 1% BN/PVDF is 14.4J/cm3The energy storage efficiency was 69.6%.
Example 2, BN/PVDF, with a volume fraction of BN of 2%,
the invention relates to a preparation method of a sheet-shaped boron nitride/polyvinylidene fluoride composite material, which comprises the following steps,
step 1, weighing 0.51g of PVDF, adding 3.5mL of DMF solution, and stirring for 3 h; weighing BN nano-sheets with the volume ratio of 2%, adding the BN nano-sheets into 1.5mL of DMF, carrying out ultrasonic treatment for 40min, stirring for 40min, and repeating for 4 times;
step 2, respectively adding 2% BN solution into the PVDF solution, and alternately carrying out ultrasonic and magnetic stirring for 5 times at 44 ℃, wherein the ultrasonic time is 60min each time, and the magnetic stirring time is 5h each time;
step 3, preparing a boron nitride/polyvinylidene fluoride compound by a tape casting method, and drying for 10 hours at the temperature of 101 ℃ to obtain a dried film;
and 4, putting the dried membrane into a vacuum drying oven, drying for 10 minutes at 180 ℃, quenching with ice water at 5 ℃, and finally drying to obtain the BN/PVDF composite material.
From FIG. 1, it can be seen that the dielectric constant of 2% BN/PVDF is about 17 at 100 Hz. From FIG. 2 it can be seen that the dielectric loss of 2% BN/PVDF is about 0.08 at 100 Hz. From FIG. 3 it can be seen that the breakdown strength of 2% BN/PVDF is 480 kV/mm. From FIG. 4, it can be seen that the energy storage density of 2% BN/PVDF is 16.7J/cm3The energy storage efficiency was 70.5%.
Example 3, BN/PVDF, with a volume fraction of BN of 3%,
the invention relates to a preparation method of a sheet-shaped boron nitride/polyvinylidene fluoride composite material, which comprises the following steps,
step 1, weighing 0.52g of PVDF, adding 4mL of DMF solution, and stirring for 3.5 h; weighing BN nano-sheets with the volume ratio of 3%, adding the BN nano-sheets into 1.5mL of DMF, carrying out ultrasonic treatment for 45min, stirring for 45min, and repeating for 3 times;
step 2, respectively adding 3% of BN solution into the PVDF solution, and alternately carrying out ultrasonic and magnetic stirring for 6 times at 45 ℃, wherein the ultrasonic time is 45min each time, and the magnetic stirring time is 5h each time;
step 3, preparing a boron nitride/polyvinylidene fluoride compound by a tape casting method, and drying for 11 hours at the temperature of 102 ℃ to obtain a dried film;
and 4, putting the dried membrane into a vacuum drying oven, drying for 8 minutes at 190 ℃, quenching with ice water at 10 ℃, and finally drying to obtain the BN/PVDF composite material.
From FIG. 1, it can be seen that the dielectric constant of 3% BN/PVDF is about 17.5 at 100 Hz. From FIG. 2 it can be seen that the dielectric loss of 3% BN/PVDF is about 0.07 at 100 Hz. From FIG. 3 it can be seen that the breakdown strength of 3% BN/PVDF is 540 kV/mm. From FIG. 4, it can be seen that the energy storage density of 3% BN/PVDF is 18.3J/cm3The energy storage efficiency was 72.3%.
Example 4, BN/PVDF, with a volume fraction of BN of 4%,
the invention relates to a preparation method of a sheet-shaped boron nitride/polyvinylidene fluoride composite material, which comprises the following steps,
step 1, weighing 0.49g of PVDF, adding 3.5mL of DMF solution, and stirring for 4 h; weighing BN nano-sheets with the volume ratio of 4 percent, adding the BN nano-sheets into 1mL of DMF, carrying out ultrasonic treatment for 60min, stirring for 60min, and repeating for 3 times;
step 2, respectively adding 4% of BN solution into the PVDF solution, and alternately carrying out ultrasonic and magnetic stirring for 4 times at 46 ℃, wherein the ultrasonic time is 50min each time, and the magnetic stirring time is 6h each time;
step 3, preparing a boron nitride/polyvinylidene fluoride compound by a tape casting method, and drying for 12 hours at 105 ℃ to obtain a dried film;
and 4, putting the dried membrane into a vacuum drying oven, drying for 5 minutes at 220 ℃, quenching by using ice water at 8 ℃, and finally drying to obtain the BN/PVDF composite material.
From FIG. 1, it can be seen that the dielectric constant of 4% BN/PVDF is about 20 at 100 Hz. From FIG. 2 it can be seen that the dielectric loss of 4% BN/PVDF is about 0.09 at 100 Hz. From FIG. 3 it can be seen that the breakdown strength of 4% BN/PVDF is 360 kV/mm. From FIG. 4, it can be seen that the energy storage density of 4% BN/PVDF is 10J/cm3The energy storage efficiency was 65.8%.
Comparative example 1, PVDF, i.e.BN/PVDF, where the volume fraction of BN is 0%,
the preparation method of the polyvinylidene fluoride material comprises the following steps,
step 1, weighing 0.5g of PVDF, adding 4mL of DMF solution, and stirring for 4 h;
step 2, preparing pure PVDF by adopting a tape casting method, and drying for 12 hours at the temperature of 100 ℃;
and 4, putting the dried membrane into a vacuum drying oven, drying for seven minutes at 200 ℃, quenching with ice water at 5 ℃, and finally drying to obtain the polyvinylidene fluoride material.
From FIG. 1 it can be seen that the dielectric constant of pure PVDF is about 9.9 at 100 Hz. From fig. 2 it can be seen that the dielectric loss of pure PVDF is about 0.1 at 100 Hz. The breakdown strength of pure PVDF from FIG. 3 is 300 kV/mm. From FIG. 4 it can be seen that the energy storage density of pure PVDF is 6.9J/cm3The efficiency was 62.7%.
Comparative example 2, BN/PVDF, with a volume fraction of BN of 5%,
the invention relates to a preparation method of a sheet-shaped boron nitride/polyvinylidene fluoride composite material, which comprises the following steps:
step 1, weighing 0.5g of PVDF, adding 4mL of DMF solution, and stirring for 4 h; weighing BN nano-sheets with the volume ratio of 5 percent, adding the BN nano-sheets into 1mL of DMF, carrying out ultrasonic treatment for 60min, stirring for 60min, and repeating for 3 times;
step 2, respectively adding 5% of BN solution into the PVDF solution, and alternately carrying out ultrasonic and magnetic stirring for 5 times at 45 ℃, wherein the ultrasonic time is 45min each time, and the magnetic stirring time is 6h each time;
step 3, preparing a boron nitride/polyvinylidene fluoride compound by a tape casting method, and drying for 12 hours at the temperature of 100 ℃ to obtain a dried film;
and 4, putting the dried film into a vacuum drying oven, drying for seven minutes at 220 ℃, quenching with ice water at 5 ℃, and finally drying to obtain the composite material.
From FIG. 1, it can be seen that the dielectric constant of 5% BN/PVDF is about 18 at 100 Hz. From FIG. 2, it can be seen that the dielectric loss of 5% BN/PVDF is about 0.095 at 100 Hz. From FIG. 3 it can be seen that the breakdown strength of 5% BN/PVDF is 270 kV/mm. From FIG. 4, it can be seen that the energy storage density of 5% BN/PVDF is 5J/cm3The energy storage efficiency was 68.5%.
By combining the data of the above examples 1 to 4 and comparative examples 1 to 2, the dielectric constant of 0% to 5% is continuously increased, the dielectric loss of 1% to 3% is continuously decreased, and the dielectric loss of 3% to 5% is continuously increased; the breakdown strength and the energy storage density of 1% -3% are continuously improved, the data of 4% is still larger than the data of 5%, and the data of 5% is smaller than 0%.
The dielectric constant of the BN/PVDF composite increases with increasing BN loading, which is caused by the introduction of BN particles that can be inserted between macromolecules to reduce chain separation, and thus dipole orientation occurs more easily. When BN is in the range of 1% to 3%, the movement of charge carriers and the formation of a conductive path can be suppressed, thereby reducing the dielectric loss of the composite material.
The breakdown strength and the energy storage density are increased and then decreased, because the high specific surface area of BN facilitates the distribution of the filler perpendicular to the applied electric field, so that the local electric field gradient is smooth, and the breakdown strength of the dielectric polymer composite material is improved, thereby improving the energy storage density; then, the addition amount of BN is increased, and under higher filler load, BN inevitably accumulates in PVDF due to strong filler-filler interaction or limited mechanical mixing effect, and agglomeration is more serious, which can cause additional gaps near the filler and bring more filler-polymer interfaces. This disadvantage counteracts the high breakdown field strength E of BNbResulting in a breakdown field strength EbIs further added according to the addition amount of BNThe step increases and decreases, and the energy storage density also decreases.

Claims (10)

1. A preparation method of a sheet-shaped boron nitride/polyvinylidene fluoride composite material is characterized by comprising the following steps,
step 1, uniformly dispersing polyvinylidene fluoride in an organic solvent to obtain a polyvinylidene fluoride solution;
adding flaky boron nitride into an organic solvent, and sequentially carrying out ultrasonic and magnetic stirring to obtain a boron nitride solution, wherein the ratio of the volume of the flaky boron nitride to the total volume of the polyvinylidene fluoride and the flaky boron nitride is 1-4%;
step 2, adding the boron nitride solution into the polyvinylidene fluoride solution, and then sequentially carrying out ultrasonic and magnetic stirring at the temperature of 43-46 ℃ to obtain a mixed system;
and 3, preparing a boron nitride/polyvinylidene fluoride compound from the mixed system by using a tape casting method, drying the boron nitride/polyvinylidene fluoride compound to obtain a compound A, drying the compound A at 180-220 ℃ for 5-10 min, and quenching to obtain the flaky boron nitride/polyvinylidene fluoride composite material.
2. The method for preparing a sheet-shaped boron nitride/polyvinylidene fluoride composite material according to claim 1, wherein in the step 1, the organic solvent is DMF.
3. The preparation method of the sheet-shaped boron nitride/polyvinylidene fluoride composite material according to claim 1, wherein the ratio of polyvinylidene fluoride to organic solvent in the preparation of the polyvinylidene fluoride solution in the step 1 is (0.49-0.52) g: (3.5-4) mL.
4. The preparation method of the flaky boron nitride/polyvinylidene fluoride composite material according to claim 3, wherein in the step 1, the flaky boron nitride is added into an organic solvent, ultrasonic processing is carried out for 0.5-1 h, magnetic stirring is carried out for 0.5-1 h, and a boron nitride solution is obtained, wherein the volume ratio of the organic solvent to the organic solvent for preparing the polyvinylidene fluoride solution is (1-1.5): (3.5-4).
5. The preparation method of the sheet-shaped boron nitride/polyvinylidene fluoride composite material according to claim 4, wherein ultrasonic stirring and magnetic stirring are alternately performed for 3-5 times during preparation of the boron nitride solution.
6. The preparation method of the sheet-shaped boron nitride/polyvinylidene fluoride composite material according to claim 1, wherein the ultrasonic stirring and the magnetic stirring are alternately performed in the step 2 during the preparation of the mixed system, and the repetition time is 4-6 times.
7. The preparation method of the sheet-shaped boron nitride/polyvinylidene fluoride composite material according to claim 6, wherein when ultrasonic and magnetic stirring are alternately performed, the time of each ultrasonic is 0.5-1 h, and the time of each magnetic stirring is 4-6 h.
8. The preparation method of the sheet-shaped boron nitride/polyvinylidene fluoride composite material according to claim 1, wherein in the step 3, the boron nitride/polyvinylidene fluoride composite is dried at 100-105 ℃ for 10-12 h.
9. The preparation method of the sheet-shaped boron nitride/polyvinylidene fluoride composite material according to claim 1, wherein in the step 3, the composite A is dried and then quenched with ice water at 2-10 ℃.
10. A flaky boron nitride/polyvinylidene fluoride composite material obtained by the method for producing a flaky boron nitride/polyvinylidene fluoride composite material according to any one of claims 1 to 9.
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CN114196050A (en) * 2021-12-16 2022-03-18 浙江工业大学 Preparation method of functional boron nitride modified PVDF (polyvinylidene fluoride) -based nano composite dielectric film
CN115926231A (en) * 2023-01-16 2023-04-07 北京五脉电气科技有限公司 Layered polyester-based high-energy-storage composite dielectric film and preparation method and application thereof
CN115926231B (en) * 2023-01-16 2024-01-26 北京五脉电气科技有限公司 Layered polyester-based high-energy-storage composite medium film and preparation method and application thereof

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