A highly stable stretchable flexible electrode and its preparation method

Abstract

This invention discloses a highly stable stretchable flexible electrode and its preparation method, relating to the field of electrode material technology. The method includes the following steps: S1: preparing a single-walled carbon nanotube (SWCNT) solution; S2: mixing the SWCNT solution and a PEDOT:PSS solution to obtain a conductive composite solution; S3: diluting the conductive composite solution with water, allowing it to stand, filtering it, retaining the filter membrane, adding semi-cured polydimethylsiloxane (PDMS) dropwise onto the filter membrane, spin-coating, heating, and removing the filter membrane to obtain a SWCNTs@PEDOT / PDMS flexible thin film electrode. This invention uses a highly dispersed composite conductive network as its core, focusing on achieving molecular-level interlocking between the conductive layer and the elastic substrate through a semi-cured PDMS spin-coating process, fundamentally solving the defects of easy detachment and delamination of the conductive layer. Combined with vacuum filtration and other steps, it prepares a flexible stretchable electrode with high conductivity, excellent tensile stability, and long-term cycling reliability.

Description

Technical Field

[0001] This invention relates to the field of electrode materials technology, specifically to a highly stable stretchable flexible electrode and its preparation method. Background Technology

[0002] Flexible and stretchable electronics is a crucial area of ​​cutting-edge interdisciplinary research, and the importance of flexible and stretchable electrodes, as a core component, is self-evident. It aims to meet application needs that traditional rigid electronic devices cannot satisfy. It can adapt to complex biological interfaces: most human tissues and organs are soft, movable, and have irregular surfaces. Flexible and stretchable electrodes can act like "electronic skin," adhering tightly and stably without affecting physiological activities, enabling long-term, stable, and high-fidelity bioelectrical signal acquisition and stimulation. It achieves stable and reliable function: in wearable devices, human-computer interaction, and other fields, daily activities cause devices to undergo complex deformations such as stretching, bending, and twisting. Traditional rigid electrodes are prone to failure or a sharp drop in signal quality, while flexible and stretchable electrodes can maintain stable electrical performance and mechanical integrity during deformation, ensuring continuous and reliable function. It can accurately acquire electrophysiological signals at the cellular level, providing support for cell-level monitoring and intervention.

[0003] With its core advantages such as adaptability to curved surfaces, shape conformability, long-term stability, and good cell compatibility, flexible stretchable electrodes have achieved breakthroughs in multiple fields: in the medical and health field, they can be used for surface physiological monitoring, implantable medical devices, and rehabilitation therapy to achieve cell-level electrical signal acquisition; in the wearable electronics field, they are integrated into smart bracelets and smart clothing to achieve unobtrusive health monitoring; at the same time, they are also widely used in cutting-edge fields such as brain-computer interfaces, soft robots, and flexible displays, becoming a key core technology supporting the development of the flexible electronics industry.

[0004] The development potential of flexible and stretchable electrodes is enormous. Breakthroughs will be made in four core directions: deep integration of bio-electronics, long-term stability, multi-functional integration, self-powering, and intelligence. Further optimization of cell compatibility will enable precise capture and regulation of electrical signals in individual cells. The technology will gradually extend from essential medical needs to areas such as public health management, human-machine symbiotic interaction, and ubiquitous intelligence, becoming an important infrastructure for the next generation of electronic technology and the biomedical industry.

[0005] Currently, there are various methods for fabricating flexible and stretchable electrodes, among which the fabrication process based on polydimethylsiloxane (PDMS) is the most widely used. The following is a summary of the main fabrication methods: 1. Direct Loading of Conductive Materials onto PDMS Substrate: This method involves first preparing a cured PDMS substrate, then directly coating or depositing conductive materials such as silver nanowires, graphene, and carbon nanotubes, or ultrathin metal films such as Au and Ag, onto the PDMS substrate surface. Electrode fabrication can be completed without complex structural design. However, the interfacial bonding between the conductive material and the PDMS substrate is weak, making it prone to detachment and delamination during stretching and bending, resulting in poor electrode stability. The uniformity of the conductive layer is difficult to control, and uneven thickness can easily occur during coating or deposition, leading to large resistance fluctuations. Furthermore, the conductive layer itself lacks elastic adaptability; even slight stretching of the substrate can cause the conductive pathway to break, limiting tensile performance and resulting in a short electrode lifespan.

[0006] 2. Molding method for unmodified PDMS-based conductive composite materials: Conductive fillers such as silver nanoparticles and carbon nanotubes are thoroughly mixed with PDMS precursors, and after adding a curing agent, the mixture is cured by casting, molding, or other methods to directly obtain a conductive elastomer electrode. However, the conductive fillers are prone to agglomeration, making it difficult to ensure uniform mixing and causing discontinuous conductive pathways within the composite material; a high filler content is required to form a conductive network, which significantly reduces the flexibility and tensile strength of the PDMS matrix itself; air bubbles are easily introduced during the mixing process, resulting in pores inside the cured material, affecting the mechanical strength and conductive stability of the electrode.

[0007] 3. PDMS Pre-stretching - Simple Wrinkling Method (No Reinforcement): The PDMS substrate is pre-stretched to 50%-200% and fixed. A metal film is deposited on its surface while it is stretched. Then, the pre-stretching force is released, causing the metal film to shrink with the PDMS substrate to form a wrinkled structure, thus completing the electrode fabrication. However, the wrinkled structure lacks reinforcement support, and after repeated stretching and releasing, the wrinkles are prone to collapse and flattening, losing their stretch adaptability; the bonding force between the metal film and PDMS is insufficient, and localized lifting and peeling may occur during shrinkage; the pre-stretching ratio requires high control, the wrinkle morphology is inconsistent, and the performance of batch electrodes varies greatly; the wrinkled structure is prone to tearing under large deformation, resulting in poor electrode durability.

[0008] In addition to the PDMS-related preparation methods mentioned above, there are two other commonly used non-PDMS substrate preparation methods: One is the hydrogel substrate conductive electrode method, which uses hydrogels such as polyacrylamide and gelatin as substrates, doping them with ions or conductive fillers to prepare flexible and stretchable electrodes. However, hydrogels are prone to water loss and brittleness, and are significantly affected by environmental humidity; their durability is poor, and their conductivity easily decreases with temperature and ion loss. The second is the simple screen printing method, which directly prints conductive materials such as conductive silver paste and carbon paste onto the surface of flexible substrates such as PDMS and thermoplastic polyurethane (TPU) to complete electrode preparation. However, the adhesion between the conductive paste and the substrate is poor, and repeated deformation easily leads to cracking and detachment; the conductive layer is thick and brittle, limiting its adhesion and stretchability.

[0009] Therefore, the above methods all belong to the simple and low-cost routes for preparing flexible stretchable electrodes, but they generally have defects: the conductive material is prone to detachment and delamination from the substrate, resulting in insufficient stability; the stretching-conductivity synergy is poor, deformation easily destroys the conductive path, and resistance fluctuates greatly, leading to poor durability. Overall, although these simple preparation methods can quickly form flexible electrodes, they are difficult to meet the needs of long-term use. The core advantage of flexible stretchable electrodes is their dynamic deformation capability, but this dynamic characteristic also places higher demands on their stability. Current electrodes have significant deficiencies in mechanical stability, conductive stability, and environmental stability. In terms of mechanical stability, the bonding force between the conductive layer and the substrate interface of the electrode is weak. During repeated stretching, bending, and other dynamic deformation processes, the conductive layer is prone to breakage, detachment, and peeling. At the same time, the internal conductive network of the electrode is easily damaged by mechanical action, leading to the breakage of the conductive path. Especially in long-term dynamic use scenarios, repeated stretching-release cycles will exacerbate the mechanical fatigue of the electrode, resulting in permanent deformation, cracks, and other problems, leading to electrode failure. In terms of conductivity stability, most electrodes cannot balance tensile properties and conductivity. The resistance increases sharply during stretching, and the resistance hysteresis effect is obvious after repeated deformation. They cannot stably output cellular electrical signals and physiological signals, making it difficult to meet the requirements for long-term cell monitoring. Summary of the Invention

[0010] The purpose of this invention is to at least solve one of the technical problems existing in the prior art, and to provide a highly stable stretchable flexible electrode and its preparation method.

[0011] The technical solution of the present invention is as follows: A method for fabricating a highly stable stretchable flexible electrode includes the following steps: S1: Prepare a solution of single-walled carbon nanotubes (SWCNTs); S2: Mix the single-walled carbon nanotube solution and the PEDOT:PSS solution to obtain the SWCNTs@PEDOT conductive composite solution; S3: Add water to the SWCNTs@PEDOT conductive composite solution, dilute, let stand, filter, retain the filter membrane, drop semi-cured PDMS onto the filter membrane, spin coat, heat, remove the filter membrane, and obtain the SWCNTs@PEDOT / PDMS flexible thin film electrode.

[0012] Preferably, in step S1, the preparation method of the single-walled carbon nanotube solution is as follows: Weigh SDS into deionized water, dissolve it completely by sonication, add SWCNTs, and continue to disperse by sonication; centrifuge the dispersed solution at 6000-10000 rpm for 10-20 minutes, and take the supernatant to obtain a single-walled carbon nanotube solution.

[0013] Preferably, the power of the ultrasound is 50-150 W.

[0014] Preferably, in step S2, the volume ratio of the single-walled carbon nanotube solution to the PEDOT:PSS solution is 150-200:1.

[0015] Preferably, in step S3, the preparation method of the semi-cured PDMS is as follows: After mixing the vinyl-terminated dimethylsiloxane as the main agent with the curing agent and defoaming, the mixture was placed in an 80°C oven and baked for 10 minutes to obtain semi-cured PDMS.

[0016] Preferably, in step S3, the spin coating speed is 1000-2000 rpm and the spin coating time is 10-20 s.

[0017] Preferably, in step S3, the heating temperature is 70-90℃ and the heating time is 5-15 min.

[0018] The present invention also discloses a highly stable stretchable flexible electrode, which is prepared by any of the preparation methods described above.

[0019] The beneficial effects of this invention are: This invention employs an in-situ composite process of SWCNTs@PEDOT:PSS composite conductive layer and semi-cured PDMS, systematically overcoming the inherent defects of traditional PDMS electrodes, hydrogel electrodes, and screen-printed electrodes in terms of interface bonding, conductive network, tensile stability, and fabrication controllability. 1. Solve the problems of weak interface bonding and easy peeling: Semi-cured PDMS is used to bond and cure the conductive film obtained by vacuum filtration in situ, so as to achieve molecular-level interlocking bonding between the conductive layer and the substrate, which greatly improves the adhesion and avoids the delamination, cracking and peeling that are common in traditional coating, deposition and printing electrodes.

[0020] 2. Constructing a stable and highly resilient conductive network: PEDOT:PSS uniformly encapsulates single-walled carbon nanotubes to form a continuous and flexible conductive pathway, overcoming problems such as filler agglomeration, large resistance fluctuations, and metal film brittleness in traditional methods, and maintaining stable conductivity even under tension.

[0021] 3. Uniform and controllable preparation with high batch consistency: Vacuum filtration ensures a uniform and dense conductive layer, and the spin coating and semi-curing processes are highly controllable, resulting in thin and highly flexible electrodes, which is superior to the problems of large thickness and low precision of screen printing.

[0022] 4. Avoid the environmental instability of hydrogels and ionic conductors: The all-solid-state organic conductive composite system has no water evaporation and no ion leakage, and its environmental stability and durability are significantly better than those of hydrogel-based electrodes. Attached Figure Description

[0023] Figure 1 A schematic diagram of the fabrication of SWCNTs@PEDOT / PDMS flexible stretchable electrode; Figure 2 SEM and electrochemical performance changes of the fully cured PDMS substrate transfer electrode after 1000 stretching cycles; Figure 3 SEM images of SWCNTs@PEDOT / PDMS flexible stretchable electrode prepared for semi-cured PDMS transfer before and after 10,000 stretches. Figure 4 Electrochemical performance characterization of SWCNTs@PEDOT / PDMS flexible stretchable electrode prepared for semi-cured PDMS transfer; Figure 5 This is a comparison of the electrochemical performance of transfer electrodes made of semi-cured PDMS, uncured PDMS, and fully cured PDMS. Detailed Implementation

[0024] This invention addresses the problems of weak interfacial bonding and poor conductivity stability in flexible stretchable electrodes. It utilizes a highly dispersed SWCNTs@PEDOT composite conductive network as its core, and focuses on achieving molecular-level interlocking bonding between the conductive layer and the elastic substrate through a semi-cured PDMS spin-coating process. This fundamentally solves the defects of easy detachment and delamination of the conductive layer. Combined with vacuum filtration and other steps, a flexible stretchable electrode with high conductivity, excellent tensile stability, and long-term cycling reliability is prepared. The preparation method is described in reference [reference]. Figure 1 The steps are as follows: S1: Prepare a solution of single-walled carbon nanotubes (SWCNTs); S2: Mix single-walled carbon nanotube solution and PEDOT (poly(3,4-ethylenedioxythiophene)):PSS (sodium polystyrene sulfonate) solution (Clevios PH1000) to obtain SWCNTs@PEDOT conductive composite solution; S3: Add water to the SWCNTs@PEDOT conductive composite solution, dilute, let stand, filter, retain the filter membrane, drop semi-cured PDMS onto the filter membrane, spin coat, heat, remove the filter membrane, and obtain the SWCNTs@PEDOT / PDMS flexible thin film electrode.

[0025] Preferably, in step S1, the preparation method of the single-walled carbon nanotube solution is as follows: Weigh SDS into deionized water, dissolve it completely by sonication, add SWCNTs, and continue to disperse by sonication; centrifuge the dispersed solution at 6000-10000 rpm for 10-20 minutes, and take the supernatant to obtain a single-walled carbon nanotube solution.

[0026] Preferably, the power of the ultrasound is 50-150 W, specifically within the range of 50, 60, 70, 80, 90, 100, 110, 120, 130, 140, 150 or any two of these values.

[0027] Preferably, in step S2, the volume ratio of the single-walled carbon nanotube solution to the PEDOT:PSS solution is 150-200:1, more preferably 170:1, but is not limited to this.

[0028] Preferably, in step S3, the preparation method of the semi-cured PDMS is as follows: The main agent (vinyl-terminated dimethylsiloxane) and the curing agent (hydrogen-containing polymethylsiloxane and platinum catalyst) are preferably mixed at a mass ratio of 10:1, defoamed, and then placed in an oven at 80°C for 10 min to obtain semi-cured PDMS.

[0029] Preferably, in step S3, the spin coating speed is 1000-2000 rpm and the spin coating time is 10-20 s.

[0030] Preferably, in step S3, the heating temperature is 70-90℃ and the heating time is 5-15 min.

[0031] The embodiments of the present invention are described in detail below. These embodiments are exemplary and are only used to explain the present invention, and should not be construed as limiting the invention. Where specific techniques or conditions are not specified in the embodiments, they are performed according to the techniques or conditions described in the literature in the art or according to the product instructions. Reagents or instruments used, unless otherwise specified, are all commercially available conventional products.

[0032] The curing agent used in the following examples is hydrogen-containing polymethylsiloxane and platinum catalyst, wherein the platinum catalyst accounts for 0.05% of the mass of the curing agent.

[0033] Example 1 (1) Preparation of SWCNTs solution: Weigh 0.3 g SDS into 100 mL of deionized water, dissolve it completely by sonication, add 0.3 g of SWCNTs, place the above solution in an ultrasonic instrument, and sonicate at 100 W power for 10 h to ensure uniform dispersion of SWCNTs. Centrifuge the dispersed solution at 8000 rpm for 15 minutes using an ultracentrifuge, and take 50% of the supernatant as the material for SWCNTs.

[0034] (2) Preparation of SWCNTs@PEDOT conductive composite: The SWCNTs solution prepared above and the commercial PEDOT:PSS solution were mixed at a volume ratio of 170:1 and sonicated for 2 h to ensure that the two were mixed evenly and that PEDOT:PSS completely coated each SWCNT.

[0035] (3) Preparation of SWCNTs@PEDOT / PDMS flexible electrode: Take 1 mL of SWCNTs@PEDOT conductive composite solution, add 60 mL of deionized water to dilute and let stand for 12 h to remove excess SDS. Vacuum filtration was used to retain the composite material on the filter membrane. The main agent (vinyl-terminated dimethylsiloxane) and curing agent (hydrogen-containing polymethylsiloxane and platinum catalyst) at a mass ratio of 10:1 were mixed and defoamed, and then placed in an 80℃ oven for 10 min to obtain semi-cured PDMS. The semi-cured PDMS was quickly dropped onto the obtained filter membrane and spin-coated at 1500 rpm for 15 s. The coating was then transferred to an 80℃ heating stage for 10 min to allow the PDMS to fully cure. The filter membrane was then peeled off to obtain a SWCNTs@PEDOT / PDMS flexible thin film electrode with a thickness of about 0.05 mm.

[0036] Comparative Example 1 Unlike Example 1, in step (3), the PDMS main agent and curing agent are mixed and stirred evenly, and then left to stand to eliminate air bubbles. A glass slide (10 cm × 10 cm) is cleaned with deionized water and placed on a spin coater. An appropriate amount of PDMS is poured onto the center of the glass slide and rotated at 1000 rpm for 10 s. The PDMS forms a uniform film on the surface of the glass slide. The glass slide is removed and placed on an 80°C heating table for heat curing for 30 minutes to obtain a fully cured PDMS film. The film is then cut to the size required for the experiment. The prepared SWCNTs@PEDOT filter membrane is transferred to the surface of the cut PDMS film. After applying uniform pressure and pressing it fully, the substrate filter membrane is carefully peeled off so that the SWCNTs@PEDOT composite material on the filter membrane is completely transferred and attached to the surface of the PDMS film, and there is no material residue on the surface of the filter membrane. A flexible thin film electrode of SWCNTs@PEDOT / PDMS with a thickness of about 0.12 mm is obtained.

[0037] Comparative Example 2 Unlike Example 1, in step (3), after the PDMS main agent and curing agent are mixed and defoamed, they are directly dripped onto the obtained filter membrane in an uncured and fully flowing state. The membrane is then spin-coated at 1500 rpm for 15 s using a spin coater, and then transferred to an 80°C heating stage for 10 min to allow the PDMS to fully cure. The filter membrane is then peeled off to obtain a SWCNTs@PEDOT / PDMS flexible thin film electrode with a thickness of about 0.025 mm.

[0038] Figure 2In Figures a and b, the SEM images of the electrodes on the fully cured PDMS substrate of Comparative Example 1 after 1000 stretching cycles are shown: low-magnification images ( Figure 2 (a) shows a wrinkled network formed on the electrode surface, as shown in the high-magnification image ( Figure 2 (b) Further reveals obvious gaps and localized cracking and peeling at the interface between the electrode conductive layer and the PDMS substrate (indicated by yellow arrows). Figure 2 Electrochemical responses of electrodes c and d before and after stretching in potassium ferricyanide (K3[Fe(CN)6]) and nitric oxide (NO) phosphate buffered saline (PBS): Figure 2 Figure 2c shows that the electrode exhibits clear and symmetrical redox peaks before stretching, indicating a continuous charge transport path and stable electrochemical response. After stretching, the redox peaks almost completely disappear. Figure 2d shows a significant change in current before and after stretching, indicating that the original electrochemical reaction system has been disrupted and cannot be used stably for a long time. Figure 5 compares the electrochemical performance of the transfer electrodes under different PDMS curing states, where a and b are the cyclic voltammetric (CV) response curves of the electrodes in 10 mM K3[Fe(CN)6] solution and PBS solution containing 180 μM NO, respectively. Figure 5 As shown, the electrode curve of the uncured PDMS substrate in Comparative Example 2 showed almost no current response throughout the entire potential window, with no obvious redox peaks, indicating a complete loss of electrochemical activity. In contrast, the electrode of the semi-cured PDMS substrate in Example 1 exhibited clear and reversible redox peaks, significant peak currents, and excellent electron transport capability and electrochemical activity. The electrode current response of the fully cured PDMS substrate in Comparative Example 1 was also extremely weak, showing almost no electrochemical activity. This is because when PDMS is fully cured, its cross-linked structure is fixed, and its fluidity is lost. It can only physically adhere to the conductive layer and cannot penetrate and encapsulate the conductive network, resulting in weak interfacial bonding and easy delamination and detachment of the electrode. When PDMS is completely uncured, its viscosity is too high and its fluidity is too strong, causing it to completely wet and encapsulate the conductive layer, blocking the electron transport pathway and leading to a loss of electrochemical activity.

[0039] Therefore, the semi-cured PDMS in Example 1 (PDMS prepolymer and curing agent in a mass ratio of 10:1, controlled to a semi-cured viscous state by pre-drying in an 80°C oven for 10 min) has both suitable fluidity and viscosity, which can fully penetrate the voids of the conductive layer to form molecular-level interlocking bonds, while avoiding over-wetting. This fundamentally solves the dual defects of complete curing and non-curing, and ensures the interfacial stability and electrochemical performance of the electrode.

[0040] Microscopic morphology stability analysis of the samples in Example 1 before and after tensile testing: Scanning electron microscopy (SEM) characterization results directly verify the excellent structural stability of the electrode of the present invention. Before tensile testing, the surface of the SWCNTs@PEDOT / PDMS composite material exhibits a uniform, continuous, and tightly interwoven fiber network. Figure 3 In Figures a and b), the conductive network formed by PEDOT:PSS tightly wrapping SWCNTs is uniformly distributed on the PDMS substrate. The fiber diameter is clear, the arrangement is regular, and there is no aggregation or breakage. After 10,000 cycles of tensile stress at 20% constant tensile strain, the microstructure of the electrode surface did not show significant damage. Figure 3 In sections c and d), the original interwoven fiber network structure was completely preserved, without any breakage, shedding, large-area aggregation, or delamination of conductive fibers. The continuity and integrity of the overall network structure remained intact. This indicates that the SWCNTs@PEDOT / PDMS composite system constructed in this invention is firmly bonded to the PDMS substrate and can maintain a stable microstructure even under extreme cyclic deformation conditions, providing solid microstructural support for the excellent electrochemical stability and long-term tensile properties of the electrode.

[0041] A three-electrode system was employed, using a flexible and stretchable SWCNTs@PEDOT / PDMS electrode as the working electrode, Ag / AgCl as the reference electrode, and platinum wire as the counter electrode. Flexible electrodes prepared by different methods were also used as working electrodes, with a working area of ​​0.5 cm² for each electrode. 2 Electrochemical characterization was performed on a Chenhua 660E electrochemical workstation. Cyclic voltammetry was used to characterize the responses in 10 mL M K3 [Fe(CN)6] solution and PBS solution containing 180 μM NO, with a scan rate of 0.1 V / s.

[0042] Electrochemical performance of the electrode was characterized using a potassium ferricyanide system. Figure 4 The results in section a) show that under different tensile amplitudes of 0%, 10%, 20%, 30%, and 50%, the electrode exhibits typical and stable redox peak shapes, with no significant distortion in peak potential difference and peak current response, indicating that the electrode maintains good electron transport capability and interface stability under large tensile deformation. In the long-term stability test of 10,000 continuous mechanical stretching cycles at a constant tensile strain of 20%, K3[Fe(CN)6] ( Figure 4 (b) and NO ( Figure 4 c) The characteristic CV curves did not show significant attenuation, and the positions of the redox peaks and the peak currents remained basically unchanged, indicating that the electrode still has excellent structural stability, electrochemical stability and durability under continuous dynamic deformation, which can meet long-term requirements.

[0043] The embodiments described above are merely preferred embodiments of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various other corresponding changes and modifications based on the technical solutions and concepts described above, and all such changes and modifications should fall within the protection scope of the claims of the present invention.

Claims

1. A method for preparing a highly stable stretchable flexible electrode, characterized in that, Includes the following steps: S1: Prepare a single-walled carbon nanotube solution; S2: Mix the single-walled carbon nanotube solution and the PEDOT:PSS solution to obtain the SWCNTs@PEDOT conductive composite solution; S3: Add water to the SWCNTs@PEDOT conductive composite solution, dilute, let stand, filter, retain the filter membrane, drop semi-cured polydimethylsiloxane onto the filter membrane, spin-coat, heat, remove the filter membrane, and obtain the SWCNTs@PEDOT / PDMS flexible thin film electrode.

2. The method for preparing a highly stable stretchable flexible electrode according to claim 1, characterized in that, In step S1, the preparation method of the single-walled carbon nanotube solution is as follows: Sodium dodecyl sulfate was weighed into deionized water and dissolved completely by sonication. Then, SWCNTs were added and the mixture was further dispersed by sonication. The dispersed solution was centrifuged at 6000-10000 rpm for 10-20 minutes, and the supernatant was collected to obtain a single-walled carbon nanotube solution.

3. The method for preparing a highly stable stretchable flexible electrode according to claim 2, characterized in that, The power of the ultrasound is 50-150 W.

4. The method for preparing a highly stable stretchable flexible electrode according to claim 1, characterized in that, In step S2, the volume ratio of the single-walled carbon nanotube solution to the PEDOT:PSS solution is 150-200:

1.

5. The method for preparing a highly stable stretchable flexible electrode according to claim 1, characterized in that, In step S3, the preparation method of the semi-cured PDMS is as follows: Vinyl-terminated dimethylsiloxane and curing agent were mixed and stirred evenly at a mass ratio of 10:

1. After standing at -20℃ for 3 hours to defoam, the mixture was placed in an 80℃ oven for 10 minutes to obtain semi-cured PDMS.

6. The method for preparing a highly stable stretchable flexible electrode according to claim 1, characterized in that, In step S3, the spin coating speed is 1000-2000 rpm and the spin coating time is 10-20 s.

7. The method for preparing a highly stable stretchable flexible electrode according to claim 1, characterized in that, In step S3, the heating temperature is 70-90℃ and the heating time is 5-15 min.

8. A highly stable stretchable flexible electrode, characterized in that, It is prepared by any one of the preparation methods described in claims 1-7.

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