Preparation method and application of ionothermal thermoelectric gel with self-repairing function

Abstract

This invention discloses a method for preparing and applying an ionic thermoelectric gel with self-healing function. The ionic thermoelectric gel is prepared by solvent evaporation. It uses polyvinyl alcohol as the basic polymer network, inositol hexaphosphate as the dynamic hydrogen bonding site and ionizable proton donor, and choline chloride as a strong electrolyte regulator. The choline cations dissociated from choline chloride can induce the formation of a stable complex structure with the inositol hexaphosphate anion. The prepared ionic thermoelectric gel benefits from the doping of choline cations, realizing the synergistic regulation of proton ionization balance based on Le Chatelier's principle, which greatly promotes the further ionization of protons in inositol hexaphosphate, enabling the ionic thermoelectric gel to achieve a giant ionic thermoelectric potential of 53.92 mV / K.

Description

Technical Field

[0001] This invention belongs to the field of ion thermoelectric materials technology, and relates to a preparation method and application of an ion thermoelectric gel with self-healing function. Background Technology

[0002] As quasi-solid-state ion thermoelectric (i-TE) devices transition from ideal laboratory testing platforms to practical wearable applications, the main challenge has shifted from electrochemical conversion efficiency to physical adaptability to real-world application scenarios. Polymer-based quasi-solid-state ion thermoelectric gel elastomers have become highly attractive candidate materials in the wearable i-TE field due to their controllable giant ion thermoelectric potential, customizable mechanical versatility, and recyclability. However, the core thermoelectric parameters and complex mechanical properties of i-TE devices are often mutually constrained. Understanding these inherent constraints is key to designing next-generation i-TE materials that combine high thermoelectric performance with mechanical suitability.

[0003] The development of i-TE materials, which possess both excellent thermoelectric properties and mechanical robustness, faces several inherent contradictions at present. Specifically, in the same thermoelectric system, conductivity often increases linearly with increasing electrolyte concentration, while thermoelectric potential initially increases and then decreases. Furthermore, high thermoelectric potential relies on loose, porous polymer channels rich in partially free solvent to provide rapid thermal diffusion pathways; however, high-toughness materials typically achieve high density and high cross-linking by constructing robust skeletal networks, which not only restricts the thermal diffusion of individual ions but also reduces ionic conductivity. Simultaneously, the construction of high-toughness i-TE materials is mainly achieved through highly crystalline or permanently cross-linked polymer networks, implying the irreversibility of the polymer backbone and restricting chain segment movement. However, the stretchability, self-healing, and even recyclability of i-TE materials usually require the introduction of more dynamic bonds (such as coordination bonds, ionic bonds, and hydrogen bonds) to achieve polymer network reconstruction and regeneration. This directly leads to an inherent conflict between current ionic thermoelectric properties and mechanical properties, and related systematic optimization designs inevitably need to seek synergy within this conflict.

[0004] Based on this, the present invention aims to decouple the constraints between the aforementioned core thermoelectric parameters and complex mechanical properties by constructing a dynamic supramolecular hydrogen bonding system composed of polyvinyl alcohol (PVA), inositol hexaphosphate (IP6), and choline chloride (ChCl), and synergistically regulating the ionization balance of charge carriers (protons) based on Le Chatelier's principle. Furthermore, this system endows i-TE gel elastomers with excellent stretchability, self-healing ability, recyclability, and a large ionic thermoelectric potential, providing an effective solution for promoting the development of i-TE technology from high efficiency to high applicability. Summary of the Invention

[0005] To address the aforementioned technical problems, this invention aims to provide a method for preparing and applying an ionic thermoelectric gel with self-healing function. This ionic thermoelectric gel is prepared using a solvent evaporation method. It uses polyvinyl alcohol as the basic polymer network, inositol hexaphosphate as a dynamic hydrogen bonding site and an ionizable proton donor, and choline chloride as a strong electrolyte regulator. The choline cations dissociated from choline chloride can induce the formation of a stable complex structure with the inositol hexaphosphate anion. Benefiting from the doping of choline cations, the prepared ionic thermoelectric gel achieves synergistic regulation of proton ionization equilibrium based on Le Chatelier's principle, greatly promoting further ionization of protons in inositol hexaphosphate, enabling the ionic thermoelectric gel to achieve a giant ionic thermoelectric potential of 53.92 mV / K.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A method for preparing a self-healing ionic thermogel comprises the following steps in sequence: S1. Polyvinyl alcohol (PVA) and inositol hexaphosphate (IP6) are co-dispersed in deionized water to obtain a mixed aqueous solution; S2. Add choline chloride (ChCl) to the mixed aqueous solution and stir until homogeneous to obtain a ternary mixture solution; S3. Pour the ternary mixture solution into a mold, and place the mold containing the ternary mixture solution in a drying oven to dry, thus obtaining PVA-IP6-ChCl ternary ionic thermoelectric gel, i.e., ionic thermoelectric gel with self-healing function.

[0007] As a limitation of the present invention, in step S1, the molar ratio of polyvinyl alcohol to inositol hexaphosphate is 5:1; the inositol hexaphosphate (IP6) molecule contains 6 hydroxyl groups and 6 phosphate groups, which can provide a high density of dynamic hydrogen bonding sites and can ionize thermally responsive protons (H). + ).

[0008] As another limitation of the present invention, in step S1, the molar ratio of inositol hexaphosphate to choline chloride is (1~3):1; the choline cations (ChCl) ionized from choline chloride (ChCl) are... + It induces the formation of a complex structure with inositol hexaphosphate anion, and based on Le Chatelier's principle, it synergistically regulates the proton ionization balance and promotes further proton ionization.

[0009] As a third limitation of the present invention, in step S2, the stirring speed is 500~1000 rpm and the time is 30~60 min.

[0010] As a fourth limitation of the present invention, in step S3, the drying temperature is 50~80 ℃ and the time is 6~12h.

[0011] As a fifth limitation of the present invention, the ionic thermoelectric gel can achieve an ionic thermoelectric potential of 53.92 mV / K and an ionic conductivity of 10.64 mS / cm at 80% relative humidity.

[0012] The self-healing ion thermoelectric gel prepared by this invention can be assembled into an ion thermoelectric capacitor module for use in a wearable self-powered thermoelectric system for collecting waste heat from the human body / environment, or as a flexible sensor for monitoring human joint movement.

[0013] The PVA-IP6-ChCl ternary ionic thermoelectric gel prepared by this invention exhibits superior mechanical properties. Through various non-covalent interactions, it constructs a multi-hydrogen-bonded amorphous network structure. A large number of dynamically reversible hydrogen bonds within this network can break and recombine under external forces, thus endowing the gel with excellent elasticity and efficient self-healing capabilities. In terms of thermoelectric properties, because the binding energy of PVA-IP6 (-35.28 kcal / mol) is significantly higher than the inter-chain binding energy of PVA (-17.94 kcal / mol), IP6 preferentially binds to PVA, effectively shielding the inherent strong hydrogen bond interactions of PVA and inhibiting the inhibition of hydrogen bonding. + The transported crystalline domains aggregated, achieving H ionization mediated by free hydroxyl groups. + Rapid thermal migration.

[0014] This invention uses choline chloride (ChCl) as a regulator to prepare PVA-IP6-ChCl ternary ionic thermoelectric gel. The strong electrolyte cations (ChCl) dissociated from ChCl are... + It can undergo strong coordination interaction with the IP6 anion to form a stable complex (R-PO4H). - -Ch + On the one hand, the stable hydrogen bonds between IP6 molecules are transformed into dynamic ionic bonds, maintaining the structural integrity and mechanical strength of the polymer. On the other hand, the PVA-IP6-ChCl ternary ionic thermoelectric gel benefits from the construction of the complex. Based on the Le Chatelier principle and the salt effect, the addition of the strong electrolyte ChCl and the formation of the complex disrupt the original equilibrium of the weak electrolyte, prompting further proton ionization of more phosphate groups in IP6. This not only provides more mobile proton sources for the cooperative hopping of the Grotthuss mechanism but also does not disrupt the hydrogen bonds between PVA and IP6, effectively ensuring the integrity of the hydrogen bond pathways used for proton thermal transport, thereby maximizing the ionic thermoelectric potential.

[0015] The above-mentioned technical solution of the present invention is a whole in which each step is closely related and mutually influential, and together they determine the morphological characteristics and performance of the product.

[0016] The above technical solution has the following advantages or beneficial effects: 1. This invention constructs a stable complex structure by introducing choline chloride, breaks and re-establishes the proton ionization equilibrium based on Le Chatelier's principle, and elucidates the regulatory law of strong electrolyte additives promoting proton ionization of weak electrolytes and enhancing ionic thermoelectric properties. 2. This invention elucidates the coupling relationship between dynamic supramolecular hydrogen bond networks, proton transport pathways, and polymer mechanical properties, achieving synergistic optimization of thermoelectric properties and skin-like mechanical multifunctionality; 3. The ternary ionic thermoelectric gel prepared by this invention has an ionic thermoelectric potential of 53.92 mV and an ionic conductivity of 10.64 mS / cm at 80% relative humidity. 4. The ternary ionic thermoelectric gel prepared by this invention has excellent stretchability and Young's modulus matching human skin; in addition, the gel has good self-healing ability, and its thermoelectric properties can remain stable after multiple stretching and self-healing cycles.

[0017] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0018] Figure 1 The graphs show the thermal response voltage and thermoelectric potential curves of the PVA-IP6-ChCl ternary ionic thermoelectric gel prepared in Example 1 of this invention, where: (a) is the thermal response voltage graph and (b) is the thermoelectric potential graph. Figure 2 The above are comparison diagrams of the thermoelectric potentials of the PVA-IP6-ChCl ternary ionic thermoelectric gels prepared in Examples 1-3 and Comparative Example 3 of this invention. Figure 3 The graphs show the thermal response voltage and thermoelectric potential curves of the gel prepared in Comparative Example 1 of this invention, where: (a) is the thermal response voltage graph, and (b) is the thermoelectric potential graph; Figure 4 This is a comparison diagram of the thermoelectric potentials of the PVA-IP6 binary ionic thermoelectric gels prepared in Comparative Example 1 and Comparative Example 4 of this invention. Figure 5 The PVA-IP6-ChCl ternary ion thermoelectric gels prepared in Examples 1-3 of this invention have configurations based on Le Chatelier's principle (ChCl doping promotes the proton ionization equilibrium of IP6) and H... + Schematic diagram of synergistic enhancement of diffusion paths; Figure 6 The XPS characterization spectra of the ion thermogels prepared in Examples 1-3 and Comparative Examples 1 and 3 of the present invention are shown, wherein: (a) is the P 2p peak spectrum and (b) is the N 1s peak spectrum. Figure 7The above are FTIR spectrum comparison diagrams of the ion thermoelectric gels prepared in Examples 1-3 of the present invention and Comparative Examples 1 and 3, respectively. Figure 8 The thermoelectric potential recovery rate curve of the PVA-IP6-ChCl ternary ionic thermoelectric gel prepared in Example 1 of the present invention under tensile strain of 0~200% is shown. Figure 9 This is a schematic diagram showing the change in thermoelectric potential recovery rate of the PVA-IP6-ChCl ternary ionic thermoelectric gel prepared in Example 1 of the present invention after 8 cutting-healing cycles. Figure 10 This is a comparison diagram of the original and the thermoelectric potential of the PVA-IP6-ChCl ternary ionic thermoelectric gel prepared in Example 1 of the present invention after dissolution and regeneration. Figure 11 The thermal response voltage diagram of the PVA-IP6-ChCl ternary ionic thermoelectric gel prepared in Example 1 of the present invention after being assembled into an ionic thermoelectric capacitor (i-TEC) during charge-discharge cycles. Figure 12 The XRD patterns are of the ion thermogels prepared in Comparative Examples 1-2 and Comparative Example 4 of this invention. Detailed Implementation

[0019] The following embodiments are merely some, not all, of the embodiments of the present invention. Therefore, the detailed descriptions of the embodiments provided below are not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0020] In this invention, unless otherwise specified, all equipment and raw materials are commercially available or commonly used in the industry. The methods described in the following embodiments are conventional methods in the art, unless otherwise specified. Example 1

[0021] This embodiment prepares an ion thermoelectric gel with self-healing function. The preparation process and steps are as follows: S1. Polyvinyl alcohol and inositol hexaphosphate are dispersed together in 10 mL of deionized water at a molar ratio of 5:1 to obtain a mixed aqueous solution; S2. Add choline chloride to the mixed aqueous solution, control the molar ratio of inositol hexaphosphate to choline chloride to be 2:1, and stir at 500 rpm for 30 min to obtain a ternary mixture solution. S3. Pour the ternary mixture solution into a mold, and place the mold containing the ternary mixture solution in a drying oven and dry it at 50 ℃ for 12 h to obtain PVA-IP6-ChCl ternary ionic thermoelectric gel, that is, ionic thermoelectric gel with self-healing function.

[0022] The thermoelectric potential of the PVA-IP6-ChCl ternary ionic thermoelectric gel prepared in this embodiment was tested. At 80%RH, its ionic thermoelectric potential reached 53.92 mV / K and its ionic conductivity was 10.64 mS / cm. Example 2

[0023] This embodiment prepares an ion thermoelectric gel with self-healing function. The preparation process and steps are as follows: S1. Polyvinyl alcohol and inositol hexaphosphate are dispersed together in 10 mL of deionized water at a molar ratio of 5:1 to obtain a mixed aqueous solution; S2. Add choline chloride to the mixed aqueous solution, control the molar ratio of inositol hexaphosphate to choline chloride to be 3:1, and stir at 700 rpm for 20 min to obtain a ternary mixture solution. S3. Pour the ternary mixture solution into a mold, and place the mold containing the ternary mixture solution in a drying oven and dry it at 70 ℃ for 10 h to obtain PVA-IP6-ChCl ternary ionic thermoelectric gel, that is, ionic thermoelectric gel with self-healing function.

[0024] The PVA-IP6-ChCl ternary ionic thermoelectric gel prepared in this embodiment has excellent ionic thermoelectric potential and ionic conductivity.

[0025] The thermoelectric potential of the PVA-IP6-ChCl ternary ionic thermoelectric gel prepared in this embodiment was tested. At 80%RH, its ionic thermoelectric potential was 49.13 mV / K and its ionic conductivity was 5.27 mS / cm. Example 3

[0026] This embodiment prepares an ion thermoelectric gel with self-healing function. The preparation process and steps are as follows: S1. Polyvinyl alcohol and inositol hexaphosphate are dispersed together in 10 mL of deionized water at a molar ratio of 5:1 to obtain a mixed aqueous solution; S2. Add choline chloride to the mixed aqueous solution, control the molar ratio of inositol hexaphosphate to choline chloride to be 1:1, and stir at 1000 rpm for 10 min to obtain a ternary mixture solution. S3. Pour the ternary mixture solution into a mold, and place the mold containing the ternary mixture solution in a drying oven and dry it at 80 ℃ for 6 h to obtain PVA-IP6-ChCl ternary ionic thermoelectric gel, that is, ionic thermoelectric gel with self-healing function.

[0027] The thermoelectric potential of the PVA-IP6-ChCl ternary ionic thermoelectric gel prepared in this embodiment was tested. At 80%RH, its ionic thermoelectric potential was 46.90 mV / K and its ionic conductivity was 22.65 mS / cm.

[0028] Comparative Example To investigate the influence of different components on the performance of the product during the preparation process of this invention, the following comparative experiments were conducted. Different ion thermoelectric gels were prepared in the following comparative examples, as detailed below: Comparative Example 1 This comparative example prepares a PVA-IP6 binary ionic thermoelectric gel. The preparation process is similar to that of Example 1, except that step S2 is not performed, i.e., choline chloride is not added.

[0029] The thermoelectric potential of the PVA-IP6 binary ion thermoelectric gel prepared in this comparative example was tested. At 80% RH, its ion thermoelectric potential was only 21.02 mV / K. This indicates that in the absence of ChCl to regulate proton ionization equilibrium, the number of mobile protons provided by the simple PVA-IP6 binary system is limited.

[0030] Comparative Example 2 This comparative example prepares a pure polymer gel. The preparation process is similar to that of Example 1, except that in step S1, inositol hexaphosphate is not added, and step S2 is not performed, that is, inositol hexaphosphate and choline chloride are not added.

[0031] Thermoelectric potential tests were performed on the ionic thermoelectric gel prepared in this comparative example. At 80% RH, its ionic thermoelectric potential was significantly lower than that of the PVA-IP6 binary ionic thermoelectric gel and the PVA-IP6-ChCl ternary ionic thermoelectric gel. XRD analysis revealed that... Figure 12 Tests show that pure PVA film at 19.6 ° It exhibits strong diffraction peaks due to hydroxyl self-association and displays a highly crystalline structure that severely hinders ion transport, making it impossible to achieve giant thermoelectric potential and skin-like flexible mechanical multifunctionality.

[0032] Comparative Example 3 In this comparative example, two PVA-IP6-ChCl ternary ionic thermoelectric gels were prepared. The preparation process was similar to that in Example 1, except that the molar ratio of inositol hexaphosphate to choline chloride was different in step S2, as detailed below: Group A: The molar ratio of inositol hexaphosphate to choline chloride is 7:1; Group B: The molar ratio of inositol hexaphosphate to choline chloride is 5:1; Group C: The molar ratio of inositol hexaphosphate to choline chloride is 1:2.

[0033] Comparative Example 4 In this comparative example, a PVA-IP6 binary ionic thermoelectric gel was prepared using a method similar to that in Example 1, except that choline chloride was not added and the molar ratio of polyvinyl alcohol to inositol hexaphosphate was different. The specific molar ratio of polyvinyl alcohol to inositol hexaphosphate is as follows: Group A: The molar ratio of polyvinyl alcohol to inositol hexaphosphate is 7:1; Group b: The molar ratio of polyvinyl alcohol to inositol hexaphosphate is 6:1; Group C: The molar ratio of polyvinyl alcohol to inositol hexaphosphate is 4:1; Group d: The molar ratio of polyvinyl alcohol to inositol hexaphosphate is 3:1; Group e: The molar ratio of polyvinyl alcohol to inositol hexaphosphate is 2:1.

[0034] Performance Testing like Figure 1 The figure shows the thermal response voltage and thermoelectric potential curves of the PVA-IP6-ChCl ternary ionic thermoelectric gel prepared in Example 1 of this invention. As can be seen from the figure, the ternary ionic thermoelectric gel exhibits stable and repeatable thermal response behavior under different temperature differences, and the thermal response voltage increases with increasing temperature difference. The thermal response voltage shows a linear relationship with the temperature difference, and its ionic thermoelectric potential is relatively high, reaching 53.92 mV / K at 80% RH. This indicates that the introduction of choline chloride effectively promotes proton ionization and thermal diffusion migration, thereby significantly improving the ionic thermoelectric performance of the gel.

[0035] like Figure 2 The figures show a comparison of the thermoelectric potentials of the PVA-IP6-ChCl ternary ionic thermoelectric gels prepared in Examples 1-3 and Comparative Example 3 of this invention. As can be seen from the figures, the ionic thermoelectric potential reaches its maximum value of 53.92 mV / K when the molar ratio of inositol hexaphosphate to choline chloride is 2:1. This indicates that the appropriate introduction of choline chloride can effectively promote the further ionization of protons in inositol hexaphosphate, thereby significantly improving the ionic thermoelectric performance of the gel. However, when the amount of choline chloride added is too high, the aggregation of the complex will adversely affect the thermal diffusion of protons, leading to a decrease in the ionic thermoelectric potential.

[0036] like Figure 3The figure shows the thermal response voltage and thermoelectric potential curves of the PVA-IP6 binary ionic thermoelectric gel prepared in Comparative Example 1 of this invention. As can be seen from the figure, at 80% RH, its ionic thermoelectric potential is only 21.02 mV / K. This indicates that in the absence of ChCl to regulate proton ionization equilibrium, the number of mobile protons provided by the simple PVA-IP6 binary system is limited.

[0037] like Figure 4 The figure shows a comparison of the thermoelectric potentials of the PVA-IP6 binary ionic thermoelectric gels prepared in Comparative Examples 1 and 4 of this invention. As can be seen from the figure, with the increase of inositol hexaphosphate, the ionic thermoelectric potential of the PVA-IP6 binary ionic thermoelectric gel exhibits a trend of first increasing and then decreasing. The maximum ionic thermoelectric potential of 21.02 mV / K is reached when the molar ratio of polyvinyl alcohol to inositol hexaphosphate is 5:1. This indicates that the appropriate introduction of inositol hexaphosphate can increase the concentration of mobile protons in the system and enhance the proton hopping transport channels, thereby improving the ionic thermoelectric performance of the gel. However, when the amount of inositol hexaphosphate added is too high, it will disrupt the continuity of hydrogen bond channels in the PVA-IP6 network, leading to a decrease in ionic thermoelectric potential.

[0038] like Figure 5 The PVA-IP6-ChCl ternary ion thermoelectric gels prepared in Examples 1-3 of this invention have a configuration based on Le Chatelier's principle (ChCl doping promotes the proton ionization equilibrium of IP6) and H... + A schematic diagram of the synergistic enhancement of diffusion pathways shows that the choline cations (Ch) dissociated from choline chloride... + It can form a stable complex structure with inositol hexaphosphate anion, maintaining the integrity of the PVA polymer network and hydrogen bond transport channels while promoting further ionization of more protons in inositol hexaphosphate, thereby increasing the concentration of mobile protons in the system and synergistically enhancing H+. + The diffusion and transmission path.

[0039] like Figure 6 and Figure 7 The figures show XPS and FTIR spectra of the ionothermal gels prepared in Examples 1-3 and Comparative Examples 1 and 3, respectively. XPS spectral (P 2p and N 1s core level shifts) and FTIR spectral analysis confirm that, compared to the PVA-IP6 binary ionothermal gel, the addition of ChCl results in a higher concentration of choline cations (ChCl). + It forms a stable complex (R-PO4H) with the IP6 anion. - -Ch + ).

[0040] like Figure 8The figure shows the thermoelectric potential recovery rate curve of the PVA-IP6-ChCl ternary ionic thermoelectric gel prepared in Example 1 of the present invention under tensile strain of 0~200%. As can be seen from the figure, the ionic thermoelectric potential of the ternary ionic thermoelectric gel changes little within the tensile strain range of 0~200%, and the thermoelectric potential recovery rate is close to the initial level, indicating that the ionic thermoelectric gel prepared in the present invention has good tensile adaptability and thermoelectric output stability.

[0041] like Figure 9 The figure shows the change in thermoelectric potential recovery rate of the PVA-IP6-ChCl ternary ionic thermoelectric gel prepared in Example 1 of the present invention after 8 cutting-healing cycles. As can be seen from the figure, after multiple cutting-healing cycles, the ionic thermoelectric potential of the ternary ionic thermoelectric gel remains basically stable, and the thermoelectric potential recovery rate is always maintained at a high level, indicating that it can still maintain good thermoelectric output performance during repeated damage and self-repair.

[0042] like Figure 10 The figure shows a comparison of the original and regenerated thermoelectric potentials of the PVA-IP6-ChCl ternary ionic thermoelectric gel prepared in Example 1 of this invention. As can be seen from the figure, the ionic thermoelectric potential of the regenerated PVA-IP6-ChCl ternary ionic thermoelectric gel is slightly lower than that of the original sample, but still remains at a high level. This indicates that the ionic thermoelectric gel still has good ionic thermoelectric performance and good recyclability after dissolution and regeneration.

[0043] like Figure 11 The figure shows the thermal response voltage of the PVA-IP6-ChCl ternary ion thermoelectric gel prepared in Example 1 of this invention after being assembled into an ion thermoelectric capacitor (i-TEC) during the charge-discharge cycle. As can be seen from the figure, the i-TEC can quickly establish a thermal response voltage under temperature difference drive and achieve stable discharge after connecting a 10 kΩ external load. When the temperature difference is removed, the device voltage reverses and can complete the reverse discharge process again, indicating that the device has good thermally induced charge-discharge cycle characteristics and stable energy output capability.

[0044] like Figure 12 The figures show the XRD patterns of the ion-thermogels prepared in Comparative Examples 1-2 and Comparative Example 4 of this invention. As can be seen from the figures, the pure PVA gel exhibits a relatively obvious crystallization diffraction peak. However, with the introduction of inositol hexaphosphate, the diffraction peaks gradually weaken and broaden, indicating a decrease in crystallinity and an enhancement of amorphous characteristics. This demonstrates that inositol hexaphosphate can weaken the strong hydrogen bonding between PVA molecular chains and inhibit the formation of crystalline domains, thereby providing more favorable structural conditions for ion transport.

[0045] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A method for preparing an ionic thermogel with self-healing function, characterized in that, Follow these steps in sequence: S1. Polyvinyl alcohol and inositol hexaphosphate are dispersed together in deionized water to obtain a mixed aqueous solution; S2. Add choline chloride to the mixed aqueous solution and stir until homogeneous to obtain a ternary mixture solution; S3. Pour the ternary mixture solution into a mold, and place the mold containing the ternary mixture solution in a drying oven to dry, thereby obtaining an ion thermoelectric gel with self-healing function.

2. The method for preparing a self-healing ionothermal gel according to claim 1, characterized in that, In step S1, the molar ratio of polyvinyl alcohol to inositol hexaphosphate is 5:

1.

3. The method for preparing a self-healing ionothermal gel according to claim 1, characterized in that, In step S1, the molar ratio of inositol hexaphosphate to choline chloride is (1~3):

1.

4. The method for preparing a self-healing ionothermal gel according to claim 1, characterized in that, In step S2, the stirring speed is 500~1000 rpm and the time is 10~30 min.

5. The method for preparing a self-healing ionothermal gel according to claim 1, characterized in that, In step S3, the drying temperature is 50~80 ℃ and the time is 6~12 h.

6. A method for preparing an ionothermal gel with self-healing function according to any one of claims 1 to 5, characterized in that, The ionic thermoelectric gel can achieve an ionic thermoelectric potential of 53.92 mV / K and an ionic conductivity of 10.64 mS / cm at 80% relative humidity.

7. An application of an ionic thermoelectric gel with self-healing function, characterized in that, The self-healing ion thermoelectric gel prepared by the preparation method described in any one of claims 1 to 5 can be assembled into an ion thermoelectric capacitor module for use as a wearable self-powered thermoelectric system for collecting waste heat from the human body / environment, or as a flexible sensor for monitoring human joint movement.

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