High-temperature-resistant aramid fiber-based flexible friction positive electrode film with sandwich structure, preparation method and nano generator

Abstract

The invention relates to the technical field of polymer fiber sensing, in particular to a high-temperature-resistant aramid fiber-based flexible friction positive electrode film with a sandwich structure, a preparation method and a nano-generator, the flexible friction positive electrode film is of a sandwich structure, and aramid paper of an outer side sealing layer of the flexible friction positive electrode film is prepared by adopting aramid fiber aerogel or a paper-making method; the aramid nanofiber phase conversion bonding layer on the inner layer is bonded by adopting an aramid nanofiber in-situ growth phase conversion method; the flexible friction positive electrode thin film is a composite material which takes aramid nanofibers as a main material and micro-nano-scale fibers as an auxiliary material, and has a nano-micron-scale multi-stage porous structure. According to the invention, the aramid nanofiber is used as a main material and is supplemented with micro-nano-scale fibers such as the aramid fiber micro-nano fibril, the para-aramid chopped fiber and the para-aramid pulp fiber for compounding to form a multi-stage porous structure which is uniform in nano-micron scale, and the abundant pore structure of the multi-stage porous structure enables the friction contact area to be increased; and the electron transfer and movement range is expanded.

Description

Technical Field

[0001] The present invention relates to the technical field of polymer fiber sensing, and specifically to a high-temperature-resistant aramid fiber-based flexible friction positive electrode film with a sandwich structure, a preparation method thereof, and a nanogenerator. Background Art

[0002] A triboelectric nanogenerator is a micro energy device that converts mechanical energy into electrical energy based on the triboelectrification effect and the electrostatic induction principle. It can collect various forms of mechanical energy, such as motion, breeze, water flow, etc.; has a simple structure, low cost, and is easy to manufacture; and can work at low frequencies. The triboelectric nanogenerator can self-drive to generate a varying current through an external acting force and has great development prospects in the field of inductive sensing.

[0003] CN117187973A discloses a preparation method for a highly sensitive stretchable fiber sensor. Using a soft-segment fiber and a hard-segment fiber as raw materials, a highly sensitive stretchable fiber sensor is prepared through local microstructure design. It can be woven into a fabric to detect human motion in real time. However, its limitations in terms of complex raw materials and high cost make it have limitations in practical applications. CN117230661A discloses a triboelectric special paper prepared using cellulose nanofibrils as the matrix material. The surface charge density can reach 196 μC·m -2 at high temperatures. However, due to the limitations of the cellulose material itself, the high-temperature resistance performance of this invention was only tested at 200°C, and its application in special extreme high-temperature environments still has certain limitations. Moreover, cellulose has poor environmental adaptability and is prone to aging and cracking in humid or corrosive environments. CN116505791A discloses a preparation method for a flexible triboelectric nanogenerator. This invention uses aramid fiber paper as the positive electrode and silicone rubber film as the negative friction layer, which has the advantages of good flexibility and strong mechanical properties, and gives play to the advantages of aramid fiber's high temperature resistance and chemical corrosion resistance. It is expected to be applied in the fields of micro-nano energy, human-computer interaction, etc. However, silicone rubber is prone to aging and deformation in a complex environment, and a relatively complex design is required to connect it with aramid materials.

[0004] Common friction materials may include polymers such as PDMS and FEP. These materials may have problems in terms of mechanical strength and temperature tolerance. Most organic materials (such as PET and PI) undergo thermal degradation when the temperature exceeds 150 °C and cannot be used in high-temperature scenarios (such as industrial equipment monitoring and aerospace). Moreover, they have weak environmental adaptability, and in humid and corrosive environments, the material aging will be accelerated, resulting in the attenuation of the triboelectric charge density (such as cellulose-based materials). In addition, traditional materials may be prone to aging in complex environments or require complex structural designs, leading to high costs or difficulty in manufacturing. However, the high-temperature resistance of aramid can expand the application scenarios to high-temperature environments, and its high strength and toughness can make the equipment more durable and extend its lifespan, making it suitable for wearable devices or extreme conditions; in addition, the chemical corrosion resistance of aramid is also an advantage, making it suitable for chemical or marine environments.

[0005] Therefore, developing a high-efficiency triboelectric nanogenerator that can be used in extreme environments such as high-temperature environments, humidity, and corrosion can expand the application scope of this triboelectric nanogenerator and can be used in fields such as human body sensing, intelligent machine learning feedback, object change sensing, and charge collection in special environments. Summary of the Invention

[0006] Aiming at the problem that the triboelectric nanogenerator in the prior art cannot be used in extreme environments such as high-temperature environments, humidity, and corrosion, the present invention provides a high-temperature-resistant aramid fiber-based flexible triboelectric positive electrode film with a sandwich structure, a preparation method, and a nanogenerator.

[0007] The present invention is realized through the following technical solutions:

[0008] A high-temperature-resistant aramid fiber-based flexible triboelectric positive electrode film with a sandwich structure. This flexible triboelectric positive electrode film has a sandwich structure. The aramid paper of its outer sealing layer is prepared by using aramid fiber aerogel or the papermaking method, and the inner aramid nanofiber phase inversion adhesive layer is bonded by using the in-situ growth phase inversion method of aramid nanofibers; this flexible triboelectric positive electrode film is a composite material mainly composed of aramid nanofibers and supplemented by micro-nano scale fibers, and has a multi-level porous structure at the nano-micro scale.

[0009] Preferably, the micro-nano scale fibers are aramid fiber micro-nano fibrils, para-aramid short cut fibers, and para-aramid pulp fibers.

[0010] A preparation method of a high-temperature-resistant aramid fiber-based flexible triboelectric positive electrode film with a sandwich structure, comprising the following steps:

[0011] S1, preparing aramid paper by using an aramid fiber / water dispersion;

[0012] Using recycled para-aramid waste as a raw material to carry out a deprotonation reaction in a potassium hydroxide / dimethyl sulfoxide / water system to prepare an aramid nanofiber / dimethyl sulfoxide dispersion;

[0013] S2. Coating an aramid nanofiber / dimethyl sulfoxide dispersion liquid on the aramid paper and immersing it in water for a protonation reduction reaction to obtain a flexible friction positive electrode film.

[0014] Preferably, in step 1, the preparation process of the aramid paper is as follows: taking aramid fibers and dispersing them in water to obtain an aramid fiber / water dispersion liquid, obtaining fiber pulp through beating, and then obtaining aramid paper with a basis weight of 70-90 g through sheet forming of the fiber pulp.

[0015] Preferably, the aramid fibers are any two of aramid fiber micro-nano fibrils, aramid short cut fibers, para-aramid pulp fibers, or aramid nanofibers; the concentration of the aramid fiber / water dispersion liquid is 1%-5%;

[0016] The rotation speed during beating is 10,000-50,000 revolutions, and the concentration of the fiber pulp is 0.5%-1.5%.

[0017] Preferably, in step 1, the recycled para-aramid waste comes from one or more of aramid cloth, aramid waste silk, aramid yarn, and aramid gloves.

[0018] Preferably, in step 1, the concentration of the aramid nanofiber / dimethyl sulfoxide dispersion liquid is 1%-5%.

[0019] Preferably, in step 2, the coating thickness of the aramid nanofiber / dimethyl sulfoxide dispersion liquid on the aramid paper is 1-5 μm.

[0020] Preferably, in step 2, when soaking in water, the aramid paper coated with the aramid nanofiber / dimethyl sulfoxide dispersion liquid is completely immersed in water, the soaking time is 2-8 h, and the water is changed every 1 h.

[0021] A high-temperature resistant aramid fiber-based flexible friction nanogenerator with a sandwich structure, which consists of an upper sealing layer, a friction positive electrode sheet, a friction negative electrode sheet, and a lower sealing layer from top to bottom. Among them, the friction positive electrode sheet is made of the above-mentioned flexible friction positive electrode film, and the friction negative electrode sheet is made of one of polyimide, polyvinyl alcohol, polystyrene, polypropylene, polyvinyl chloride, and rubber; during assembly, first cut the friction positive electrode sheet and the film negative electrode sheet of the same size, then stick copper tapes on the back of the friction positive electrode sheet and the friction negative electrode sheet respectively, and connect the wires to the upper and lower two electrodes to form a friction nanogenerator.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] In a high-temperature resistant aramid fiber-based flexible triboelectric positive electrode film with a sandwich structure of the present invention, aramid nanofibers with a unique nano-scale structure, high strength and modulus, high specific surface area, high aspect ratio, and excellent temperature resistance are used as the main material, supplemented by micro-nano scale fibers such as aramid fiber micro-nanofibrils, para-aramid short cut fibers, and para-aramid pulp fibers for compounding to form a multi-level porous structure existing at both nano and micro scales. Its rich pore structure increases the contact area of friction and expands the range of electron transfer and movement. Its outer seal layer is prepared by using aramid fiber aerogel or the papermaking method, and the inner layer is bonded by the in-situ growth phase inversion method of aramid nanofibers. Moreover, the temperature resistance and flame retardant properties of aramid fibers far exceed those of traditional polymer materials. It can be used in fields such as aerospace, motors, and insulation, effectively maintaining the stability and lifespan of devices at high temperatures, expanding the application scope of aramid fibers and the application of triboelectric nanogenerators in high-temperature fields.

[0024] When preparing high-performance aramid paper with aramid nanofibers and aramid short cut fibers as raw materials in a preparation method of a high-temperature resistant aramid fiber-based flexible triboelectric positive electrode film of the present invention, aramid pulp fibers or aramid precipitated fibers are doped during the co-papermaking process. Due to the large dimensional differences in the components of the aramid paper, the paper structure is fluffy, the interfacial bonding force is strong, and the mechanical strength and compressive strength are high. At the same time, problems such as low retention rate and difficult water filtration caused by directly using aramid nanofibers to prepare the triboelectric positive electrode layer are also avoided. Subsequently, protonated reduced aramid nanofibers are used as adhesives for the high-performance aramid paper, which have a unique nano-scale structure, high strength and modulus, high specific surface area, high aspect ratio, temperature resistance, and wet strength. The molecular chains of aramid are connected by rigid aromatic rings and amide bonds, and this structure makes the molecular chains have high rigidity and linearity, thereby improving the tensile strength of the entire triboelectric positive electrode. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a schematic diagram of the structure of a high-temperature resistant aramid fiber-based flexible triboelectric positive electrode film with a sandwich structure of the present invention;

[0026] Figure 2 is a flowchart of a preparation method of a high-temperature resistant aramid fiber-based flexible triboelectric positive electrode film with a sandwich structure of the present invention;

[0027] Figure 3 is a schematic diagram of the structure of a nanogenerator of the present invention;

[0028] Figure 4 is a super-depth-of-field microscope image of the flexible triboelectric positive electrode film in Example 3;

[0029] Figure 5 is the test result of the contact friction voltage response of the nanogenerator obtained in Example 3;

[0030] Figure 6It is the thermal stability diagram of the flexible friction positive electrode film in Example 3;

[0031] Figure 7 It is the thermogravimetric diagram of the flexible friction positive electrode film in Example 3.

[0032] In the figure, A is aramid paper; B is the aramid nanofiber phase inversion adhesive layer. Detailed implementation manners

[0033] The present invention will be further described in detail below with specific embodiments, which are explanations of the present invention rather than limitations.

[0034] The present invention discloses a high-temperature resistant aramid fiber-based flexible friction positive electrode film with a sandwich structure. Referring to Figure 1 , this flexible friction positive electrode film has a sandwich structure. The aramid paper on the outer sealing layer is prepared by using aramid fiber aerogel or the papermaking method, and the aramid nanofiber phase inversion adhesive layer on the inner layer is bonded by the in-situ growth phase inversion method of aramid nanofibers; this flexible friction positive electrode film is a composite material mainly composed of aramid nanofibers and supplemented by micro-nano scale fibers, and has a multi-level porous structure with nano-micron scale. Among them, the micro-nano scale fibers are aramid fiber micro-nano fibrils, para-aramid short cut fibers, and para-aramid pulp fibers.

[0035] The present invention discloses a preparation method of a high-temperature resistant aramid fiber-based flexible friction positive electrode film with a sandwich structure. Referring to Figure 2 , it includes the following steps:

[0036] S1. Prepare aramid paper by using an aramid fiber / water dispersion liquid; specifically, the preparation process of the aramid paper is as follows: Take aramid fibers and disperse them in water to obtain an aramid fiber / water dispersion liquid with a concentration of 1% - 5%. After defibrillation at a rotational speed of 10,000 - 50,000 revolutions, a fiber slurry with a concentration of 0.5 - 1.5% is obtained. Then, the fiber slurry is sheeted to obtain aramid paper with a basis weight of 70 - 90 g. Among them, the aramid fibers are any two of aramid fiber micro-nano fibrils, aramid short cut fibers, para-aramid pulp fibers, and aramid nanofibers.

[0037] Use recycled para-aramid waste as raw material to carry out a deprotonation reaction in a potassium hydroxide / dimethyl sulfoxide / water (KOH / DMSO / H2O) system to prepare an aramid nanofiber / dimethyl sulfoxide dispersion liquid with a concentration of 1% - 5%; among them, the recycled para-aramid waste comes from one or several of aramid cloth, aramid waste silk, aramid yarn, and aramid gloves.

[0038] S2. Coat the aramid paper with an aramid nanofiber / dimethyl sulfoxide dispersion liquid with a thickness of 1 - 5 μm, and immerse it in water for 2 - 8 h for a protonation reduction reaction, and change the water every 1 h to obtain a flexible friction positive electrode film.

[0039] The present invention discloses a high-temperature resistant aramid fiber-based flexible triboelectric nanogenerator with a sandwich structure. Referring to Figure 3 , the generator from top to bottom is successively an upper sealing layer, a triboelectric positive electrode sheet, a triboelectric negative electrode sheet, and a lower sealing layer. Among them, the triboelectric positive electrode sheet is made of the flexible triboelectric positive electrode film described above, and the triboelectric negative electrode sheet is made of one of polyimide, polyvinyl alcohol, polystyrene, polypropylene, polyvinyl chloride, and rubber; during assembly, when assembling, first cut the triboelectric positive electrode sheet and the film material negative electrode sheet of the same size (such as a square with a size of 5×5 cm 2 ), then paste copper tapes on the back of the triboelectric positive electrode sheet and the triboelectric negative electrode sheet respectively, and connect the wires to the upper and lower electrodes to form a triboelectric nanogenerator.

[0040] Example 1

[0041] Step 1: Prepare aramid fiber / water dispersion. Take a certain mass of aramid nanofibrils and aramid short-cut fibers and disperse them in water at a ratio of 70:30. Stir and disperse them at 10000 r by a standard fiber defibrator to obtain a fiber slurry with a mass concentration of 0.5%. Then use a sheet former to prepare aramid paper with a basis weight of 70 g.

[0042] Prepare aramid nanofiber / dimethyl sulfoxide dispersion. Using recycled para-aramid waste (one or several of aramid cloth, aramid waste silk, aramid yarn, and aramid gloves) as raw materials, a deprotonation reaction occurs in a potassium hydroxide / dimethyl sulfoxide / water (KOH / DMSO / H2O) system to prepare an aramid nanofiber / dimethyl sulfoxide dispersion with a mass concentration of 1%.

[0043] Step 2: Prepare the triboelectric positive electrode sheet of the triboelectric nanogenerator. Coat a layer of aramid nanofiber / dimethyl sulfoxide dispersion on two prepared high-performance aramid papers in Step 1, and quickly immerse them in water for the protonation reduction reaction of aramid fibers.

[0044] Step 3: Assemble the triboelectric nanogenerator, that is, paste copper tapes on the back of the triboelectric positive electrode sheet and the triboelectric negative electrode sheet respectively, and connect the wires to the upper and lower electrodes to form a triboelectric nanogenerator.

[0045] Example 2

[0046] Step 1: Prepare aramid fiber / water dispersion: Take a certain mass of aramid pulp fibers and aramid nanofibers and disperse them in water at a ratio of 80:20. Stir and disperse them at 15000 r by a standard fiber defibrator to obtain a fiber slurry with a mass concentration of 1.5%. Use a sheet former to prepare aramid paper with a basis weight of 90 g.

[0047] Preparation of aramid nanofiber / dimethyl sulfoxide dispersion: Using recycled para-aramid waste (such as aramid cloth, aramid waste silk, aramid yarn, or aramid gloves, one or more of them) as raw materials, a deprotonation reaction occurs in the potassium hydroxide / dimethyl sulfoxide / water (KOH / DMSO / H2O) system to prepare an aramid nanofiber / dimethyl sulfoxide dispersion with a mass concentration of 5%.

[0048] Step 2: Preparation of the friction positive electrode sheet of the triboelectric nanogenerator. Coat a layer of aramid nanofiber / dimethyl sulfoxide dispersion on the two prepared high-performance aramid papers in Step 1, and quickly immerse them in water for the protonation reduction reaction of aramid fibers.

[0049] Step 3: Assemble the triboelectric nanogenerator, that is, paste copper tapes on the back of the friction positive electrode sheet and the friction negative electrode sheet respectively, connect the wires to the upper and lower electrodes, and form the triboelectric nanogenerator.

[0050] Example 3

[0051] Step 1: Preparation of aramid fiber / water dispersion. Take a certain mass of aramid fiber micro-nano fibrils and aramid pulp fibers and disperse them in water at a ratio of 60:40. Stir and disperse at 12000 r using a standard fiber defibrator to obtain a fiber slurry with a mass concentration of 1%. Use a sheet former to prepare high-performance aramid paper with a basis weight of 70 g.

[0052] Preparation of aramid nanofiber / dimethyl sulfoxide dispersion. Using recycled para-aramid waste (such as aramid cloth, aramid waste silk, aramid yarn, or aramid gloves, one or more of them) as raw materials, a deprotonation reaction occurs in the potassium hydroxide / dimethyl sulfoxide / water (KOH / DMSO / H2O) system to prepare an aramid nanofiber / dimethyl sulfoxide dispersion with a mass concentration of 3%.

[0053] Step 2: Preparation of the friction positive electrode of the triboelectric nanogenerator. Coat a layer of aramid nanofiber / dimethyl sulfoxide dispersion on the two prepared high-performance aramid papers in Step 1, and quickly immerse them in water for the protonation reduction reaction of aramid fibers.

[0054] Step 3: Assemble the triboelectric nanogenerator, that is, paste copper tapes on the back of the friction positive electrode sheet and the friction negative electrode sheet respectively, connect the wires to the upper and lower electrodes, form the triboelectric nanogenerator, and conduct contact-separation tests on it.

[0055] Refer to Figure 4 , it can be seen that there are undulations on the material surface, which can expand the specific surface area of the material. Refer to Figure 5 , by testing the contact-separation output voltage of the triboelectric nanogenerator prepared in the example, the results can be obtained: This device has good stability, can output a stable voltage under limited conditions, and can maintain long-term application.

[0056] Refer to Figure 6 , the flexible friction positive electrode film obtained in Example 3 was subjected to a thermal stability test. During the heating process from 50°C to 350°C, the positive electrode film did not undergo dimensional shrinkage, proving that the positive electrode film has good thermal stability. Figure 7 Figure 6 is the thermogravimetric diagram of the flexible friction positive electrode film obtained in Example 3. In an atmosphere of nitrogen, after rising from 5°C to 750°C, the mass retention rate is 40.3%, indicating that the film has good heat resistance.

[0057] Example 4

[0058] Step 1: Prepare aramid fiber / water dispersion: Take a certain mass of aramid nanofibers and aramid pulp fibers and disperse them in water at a ratio of 30:70. Stir and disperse them at 13,000 r by a standard fiber defibrator to obtain a fiber slurry with a mass concentration of 1.3%. Use a sheet former to prepare high-performance aramid paper with a basis weight of 70 g;

[0059] Prepare aramid nanofiber / dimethyl sulfoxide dispersion: Use recycled para-aramid waste (one or several of aramid cloth, aramid waste silk, aramid yarn, aramid gloves) as raw materials to carry out a deprotonation reaction in a potassium hydroxide / dimethyl sulfoxide / water (KOH / DMSO / H2O) system to prepare an aramid nanofiber / dimethyl sulfoxide dispersion with a mass concentration of 3%;

[0060] Step 2: Prepare the friction positive electrode sheet of the triboelectric nanogenerator: Coat a layer of aramid nanofiber / dimethyl sulfoxide dispersion on two pieces of the prepared high-performance aramid paper in Step 1, and quickly immerse it in water for the protonation reduction reaction of aramid fibers.

[0061] Step 3: Assemble the triboelectric nanogenerator, that is, paste copper tapes on the back of the friction positive electrode sheet and the friction negative electrode sheet respectively, and connect the wires to the upper and lower electrodes to form the triboelectric nanogenerator.

[0062] The above are only the preferred embodiments of the present invention and are not used to limit the technical solutions of the present invention. Those skilled in the art should understand that without departing from the spirit and principle of the present invention, the technical solutions can be modified and replaced simply. These modifications and replacements also fall within the protection scope covered by the claims.

Claims

1. A high temperature resistant aramid fiber-based flexible friction positive electrode film with a sandwich structure, characterized in that: The flexible friction positive electrode film has a sandwich structure, the aramid paper of the outer sealing layer is prepared by aramid fiber aerogel or papermaking method, and the inner aramid nanofiber phase transformation adhesive layer is bonded by aramid nanofiber in-situ growth phase transformation method; the flexible friction positive electrode film is a composite material mainly composed of aramid nanofibers and supplemented by micro-nanoscale fibers, and has a multi-level porous structure at the nanometer and micrometer scales.

2. The high temperature resistant aramid fiber-based flexible friction positive electrode film of sandwich structure according to claim 1, characterized in that: The micro-nano scale fibers are aramid fiber micro-nano filaments, para-aramid staple fibers and para-aramid pulp fibers.

3. A method for preparing a high temperature resistant aramid fiber-based flexible friction positive electrode film of a sandwich structure as claimed in any one of claims 1 to 2, characterized in that: The following steps are involved: S1, preparing aramid paper using aramid fiber / water dispersion; Aramid nanofiber / dimethyl sulfoxide dispersion was prepared by deprotonation reaction of recycled para-aramid waste in potassium hydroxide / dimethyl sulfoxide / water system; S2, coating aramid nanofiber / dimethyl sulfoxide dispersion on aramid paper and immersing it in water for protonation reduction reaction to obtain a flexible tribopositive electrode film.

4. The method for preparing a high temperature resistant aramid fiber-based flexible friction positive electrode film of a sandwich structure according to claim 3, characterized in that: In step 1, the preparation process of aramid paper is as follows: aramid fibers are dispersed in water to obtain aramid fiber / water dispersion, fiber slurry is obtained by delamination, and then the fiber slurry is sheeted to obtain aramid paper with a quantitative of 70 to 90 g.

5. The method for preparing a sandwich-structured high-temperature-resistant aramid fiber-based flexible friction positive electrode film according to claim 4, characterized in that: The aramid fiber is any two of aramid fiber micro-nano filaments, aramid short fibers, para-aramid pulp fibers or aramid nanofibers; the concentration of the aramid fiber / water dispersion is 1% to 5%; The number of revolutions during decomposition is 10,000-50,000 revolutions, and the concentration of the fiber slurry is 0.5-1.5%.

6. The method for preparing a sandwich-structured high-temperature-resistant aramid fiber-based flexible friction positive electrode film according to claim 3, characterized in that: In step 1, the recycled para-aramid waste comes from one or more of aramid cloth, aramid waste silk, aramid yarn, and aramid gloves.

7. The method for preparing a sandwich-structured high-temperature-resistant aramid fiber-based flexible friction positive electrode film according to claim 3, characterized in that: In step 1, the concentration of the aramid nanofiber / dimethyl sulfoxide dispersion is 1% to 5%.

8. The method for preparing a sandwich-structured high-temperature-resistant aramid fiber-based flexible friction positive electrode film according to claim 3, characterized in that: In step 2, the coating thickness of the aramid nanofiber / dimethyl sulfoxide dispersion on the aramid paper is 1-5 μm.

9. The method for preparing a sandwich-structured high-temperature-resistant aramid fiber-based flexible friction positive electrode film according to claim 3, characterized in that: In step 2, when immersing in water, the aramid paper coated with the aramid nanofiber / dimethyl sulfoxide dispersion is completely immersed in water for 2 to 8 hours, and the water is changed every 1 hour.

10. A high temperature resistant aramid fiber-based flexible friction nanogenerator with a sandwich structure, characterized in that: The generator comprises an upper sealing layer, a friction positive electrode sheet, a friction negative electrode sheet and a lower sealing layer from top to bottom, wherein the friction positive electrode sheet is made of the flexible friction positive electrode film described in any one of claims 1 to 2, and the friction negative electrode sheet is made of one of polyimide, polyvinyl alcohol, polystyrene, polypropylene, polyvinyl chloride and rubber; when assembling, first cut the friction positive electrode sheet and the film material negative electrode sheet of the same size, and then paste copper tape on the back of the friction positive electrode sheet and the friction negative electrode sheet respectively, and connect the wires to the upper and lower electrodes to form a friction nanogenerator.

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