Use of a spreadable high conductance flexible composite

Abstract

The application discloses application of a smearable high-conductivity flexible composite material and relates to the field of flexible composite materials, and comprises the following steps: preparing a composite conductive powder: SrCO3 powder and TiN powder are uniformly mixed and ground, pressed into a block, wrapped with graphite paper, buried and burned to prepare a titanium nitride and strontium titanate conductive composite block. The traditional perovskite material-based hard ceramic is prepared into a smearable conductive material similar to a chalk for the first time, and the material has a good smearable writing function. The titanium nitride and strontium titanate conductive composite block is ground to obtain the composite conductive powder. Preparing a high-conductivity flexible composite material: the titanium nitride and strontium titanate composite block is directly smeared on a flexible substrate or the composite conductive powder is attached on the flexible substrate to form the high-conductivity flexible composite material. The application of the smearable high-conductivity flexible composite material expands the application of the perovskite material in the field of flexible materials and promotes the development of inorganic oxide flexible conductive ceramics.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of flexible composite materials, and particularly to an application of a smearable high-conductivity flexible composite material. BACKGROUND

[0002] Currently, flexible thermoelectric materials are widely used in wearable and portable electronic devices due to their excellent plastic deformation capability, lightweight characteristics, and concealment. However, in the research of many flexible thermoelectric materials, the traditional preparation process is complex and has low yield, and it is often difficult to break through the inherent limitations. It is worth mentioning that we innovatively use a muffle furnace to quickly prepare a smearable strontium titanate block, successfully transforming the traditional SrO(SrTiO3) n (n = 1, 2, …, ∞) hard ceramic material into a pencil-like smearable conductive material. This unique method makes the material have good smearable writing function, even if it is smeared on the dust-free paper, it can still maintain high conductivity, which is a very rare achievement in previous research.

[0003] Conductive polymers have been considered as ideal flexible thermoelectric materials due to their easy synthesis and good ductility. Compared with traditional inorganic thermoelectric materials, organic materials are flexible, but the carrier mobility and power output are low. Except for Bi2Te3 alloy, most alloy materials are inherently inflexible, rarely used in flexible thermoelectric materials, and large-scale energy conversion applications are limited by low reserves and high cost. Although new thermoelectric materials such as Half-Hassler, cage, and skutterudite, as well as traditional oxide thermoelectric materials such as SrTiO3, NaCoO2, and BiCuSeO, have significantly improved performance, research on these materials in flexible applications is still lacking.

[0004] It is worth noting that oxide materials have the advantages of high stability, high abundance of rare earth, low cost, and environmental friendliness compared to intermetallic compounds. However, due to the natural brittleness and lack of ductility of inorganic semiconductors and ceramic materials, how to apply oxide thermoelectric materials to the flexible field has always been a technical problem. Oxide perovskite materials are widely studied due to their low cost, multiple functions, environmental friendliness, and resource abundance. Our research successfully prepared a soft and smearable high-conductivity inorganic perovskite thermoelectric material through a simple and efficient method by optimizing the preparation process, providing a new solution for the preparation of flexible thermoelectric materials.

[0005] Compared with traditional materials, the new type of flexible inorganic oxide thermoelectric material not only breaks through the complexity and limitation of material preparation, but also has good thermoelectric performance and infrared radiation performance. In the industrial field of high-temperature furnace and the like, the temperature can be utilized twice by combining the high infrared emissivity characteristic with the Seebeck effect in the thermoelectric performance, so as to further improve the utilization rate of energy. Therefore, the flexible material prepared by using the same has extremely high application potential and value, and needs to be further developed and researched to fill the deficiency of the prior art in the field and expand the application range and efficiency of the thermoelectric material. SUMMARY

[0006] The application aims to provide an application of a spreadable high-conductivity flexible composite material, which is simple to operate and easy to control in the operation process, and can quickly and efficiently synthesize TiN / SrO (SrTiO3) n (n=1, 2, …, ∞) composite powder and make a flexible composite material with excellent electrical performance through a simple spreading process. SrTiO3 n (n=1, 2, …, ∞) of TiN / SrO (SrTiO3) is a basic structural unit, and n represents the number of repetitions or the number of the basic unit.

[0007] To achieve the above-mentioned purpose, the application provides an application of a spreadable high-conductivity flexible composite material, the spreadable high-conductivity flexible composite material TiN / SrO (SrTiO3) n (n=1, 2, …, ∞) includes a spreadable titanium nitride and strontium titanate composite conductive material and a flexible substrate.

[0008] Preferably, the following steps are included:

[0009] Preparation of the composite conductive material: uniformly mix and grind SrCO3 powder and TiN powder, press into a block, wrap with graphite paper, sinter to obtain a spreadable high-conductivity titanium nitride and strontium titanate composite block, grind the high-conductivity titanium nitride and strontium titanate composite block to obtain a composite conductive powder; the molar ratio of SrCO3 to TiN is X:Y, wherein X=1 and 0.7Y<2;

[0010] Preparation of the high-conductivity flexible composite material: attach the composite conductive material to the flexible substrate to form a high-conductivity flexible composite material; the composite conductive material includes the high-conductivity titanium nitride and strontium titanate composite block or the composite conductive powder.

[0011] The following steps are also included:

[0012] Preparation of composite conductive powder: SrCO3 powder and TiN powder were uniformly mixed and ground, pressed into blocks, wrapped with graphite paper, and subjected to a first calcination to obtain a spreadable, highly conductive titanium nitride and strontium titanate first composite block. The highly conductive titanium nitride and strontium titanate first composite block was then ground to obtain the first composite conductive powder TiN / SrO (SrTiO3). n (n = 1, 2,…, ∞); The first composite conductive powder is pressed into a block again and placed in a muffle furnace for a second burial or vacuum hot pressing sintering to prepare a denser, spreadable titanium nitride and strontium titanate second composite block. The titanium nitride and strontium titanate second composite block is ground to obtain the second composite conductive powder.

[0013] Preparation of high conductivity flexible composite material: The first composite block or the first composite conductive powder, the second composite block or the second composite conductive powder are coated on the flexible matrix to form a high conductivity flexible composite material.

[0014] The temperature during the first burning is 1200-1300℃, and the heat preservation time is 3-6 hours.

[0015] During the second burning, the temperature is 1400-1600℃ and the heat preservation time is 5-10 hours.

[0016] During vacuum hot pressing sintering, the temperature is 1200-1500℃ and the holding time is 1-3 h.

[0017] Preferably, the composite conductive powder undergoes at least one grinding, pressing, and sintering process during preparation.

[0018] Preferably, the flexible substrate includes insulating flexible materials and metal foils, wherein the insulating flexible materials include cellulose, fabrics, and paper.

[0019] Preferably, it includes the following steps:

[0020] Preparation of composite conductive materials: Alkaline earth metal carbonate powder and TiN powder are uniformly mixed and ground, pressed into blocks, wrapped with graphite paper, and sintered to obtain a spreadable, highly conductive titanium nitride and alkaline earth metal titanate composite block. The highly conductive titanium nitride and alkaline earth metal titanate composite block is then ground to obtain composite conductive powder. The molar ratio of alkaline earth metal carbonate to TiN in the composite block is X:Y, where X=1 and 0.7. <Y<2;

[0021] Preparation of high-conductivity flexible composite materials: A composite conductive material is attached to a flexible matrix to form a high-conductivity flexible composite material; the composite conductive material includes a high-conductivity titanium nitride and alkaline earth metal titanate composite block or composite conductive powder. Preferably, the alkaline earth metal carbonate powder includes calcium carbonate powder and barium carbonate powder.

[0022] Preferably, the way of attaching the composite conductive material to the flexible substrate includes

[0023] By solution processing method, a suspension is formed by dispersing the powder in a solvent, then deposited on the substrate by coating or dipping, etc., and a flexible thin film is formed after evaporation of the solvent, forming a high conductivity flexible composite material.

[0024] Or using melt extrusion method, by heating and melting, then extrusion forming, and cooling to form a high conductivity flexible composite material.

[0025] Or using 3D printing technology, by layer-by-layer printing of the mixture of powder and binder, to realize the preparation of flexible material with complex structure, forming a high conductivity flexible composite material.

[0026] Or mixed with a solvent to prepare a paste, which is then applied to the flexible substrate to form a high conductivity flexible composite material.

[0027] Or using a composite block to apply to the flexible substrate, and after drying, a flexible composite material with high conductivity is formed.

[0028] Preferably, the applicable titanium nitride and strontium titanate composite block is a high-conductivity N-type applicable semiconductor.

[0029] Preferably, the sintering temperature is 1200-1600℃, the holding time is 1-10h, and the heating rate is 3-10℃ / min.

[0030] Preferably, the pressure during pre-pressing is 1MPa-50MPa.

[0031] The application of the applicable high-conductivity flexible composite material and the high-conductivity titanium nitride and strontium titanate composite powder in thermoelectric materials and infrared radiation materials.

[0032] Therefore, the application of the above-mentioned applicable high-conductivity flexible composite material has the following technical effects:

[0033] (1) The preparation method is simple and fast, the operation process is easy to control, and it is suitable for large-scale production.

[0034] (2) The composite powder synthesized by the solid phase reaction method has good dispersibility and uniformity.

[0035] (3) The composite material has extremely low resistance and can be easily coated on various substrates such as dust-free paper, and still has good conductivity.

[0036] (4) The composite material has high infrared emissivity, and coating in a vacuum high-temperature furnace can make secondary use of heat and improve energy utilization.

[0037] (5) The material has wide application range, can play an important role in the fields of electronic equipment, sensor, energy storage and the like, and promotes the development of inorganic oxide flexible conductive ceramic.

[0038] (6) The material is prepared by the solid phase reaction method and the coating process, realizes the flexibility and high conductivity of the material, is simple in preparation, has wide application potential, and is expected to replace the traditional material in the fields of thermoelectricity, infrared radiation and the like.

[0039] The technical solutions of the present application are further described in detail below by means of the drawings and examples. BRIEF DESCRIPTION OF DRAWINGS

[0040] Figure 1 X-ray diffraction (XRD) patterns of the samples obtained in Examples 1, 2, 3 and 4;

[0041] Figure 2 A schematic diagram of coating the flexible composite material prepared by Example 1 onto the dust-free paper; Figure 2 (a) is the resistance test diagram of the flexible material prepared by directly coating the second composite conductive block obtained in Example 1 onto the dust-free paper; Figure 2 (b) is the Seebeck coefficient test diagram of the flexible material prepared by directly coating the second composite conductive block obtained in Example 1 onto the dust-free paper; Figure 2 (c) is the resistance test diagram of the second composite conductive powder obtained in Example 1; Figure 2 (d) is the Seebeck coefficient test diagram of the second composite conductive powder obtained in Example 1; Figure 2 (e) is the resistance test diagram of the second composite conductive block obtained in Example 1; Figure 2 (f) is the Seebeck coefficient test diagram of the second composite conductive block obtained in Example 1;

[0042] Figure 3 The infrared emissivity curve of the sample obtained in Example 1;

[0043] Figure 4 X-ray diffraction (XRD) patterns of the samples obtained in Examples 9 and 10. DETAILED DESCRIPTION

[0044] The technical solutions of the present application are further described in detail below by means of the drawings and examples.

[0045] Unless otherwise defined, the technical terms or scientific terms used in the present application shall have the usual meanings understood by those skilled in the art to which the present application belongs.

[0046] Example 1

[0047] SrCO3 powder and TiN powder were mixed in a molar ratio of 0.7:1, and a proper amount of anhydrous ethanol was added as a solvent for grinding for 3 h.

[0048] The ground mixture was dried at 80°C for 2 h.

[0049] The dried powder was pressed using a powder tablet press at 3 MPa for 3 min,

[0050] After being pressed into a block, the block was wrapped with graphite paper and buried in graphite powder in a muffle furnace at 1200°C for 3-5 h to obtain a smearable high-conductivity TiN / SrO (SrTiO3). n (n = 1, 2, …, ∞) a first composite block, and a first composite conductive powder of titanium nitride and strontium titanate can be obtained after grinding.

[0051] The first composite conductive powder was pressed into a block at 1 MPa for 3 min and placed in a muffle furnace at 1500°C for graphite burial for 6 h to prepare a relatively dense smearable TiN / SrO (SrTiO3). n (n = 1, 2, …, ∞) a second composite conductive block, and a second composite conductive powder can be obtained after grinding.

[0052] As shown in Table 1, the resistance of the first composite conductive block is about 11 Ω, and the Seebeck coefficient is about -8 μV / K; the resistance of the flexible material prepared by directly smearing the first composite conductive block on the dust-free paper is about 3.5 KΩ; the resistance of the second composite conductive block is about 27 Ω, and the Seebeck coefficient is about -12 μV / K; the resistance of the second composite conductive powder is about 13.5 KΩ, and the Seebeck coefficient is -11 μV / K; the resistance of the flexible material prepared by directly smearing the second composite conductive block on the dust-free paper is about 26 KΩ, and the Seebeck coefficient is -33 μV / K. In particular, the resistance of the flexible material prepared by smearing on the dust-free paper is related to the amount of coating, and the resistance is about 3520.6 Ω per square centimeter of 0.005 g of the first composite conductive powder material, about 3359.4 Ω per square centimeter of 0.01 g of the first composite conductive powder material, and about 3196.0 Ω per square centimeter of 0.02 g of the first composite conductive powder material.

[0053] Since the conductivity of strontium titanate is highly dependent on the oxygen vacancy concentration, at high temperatures, oxygen atoms diffuse into the lattice to fill the oxygen vacancies due to incomplete oxygen isolation, reducing the carrier concentration. At the same time, high temperature promotes the complete oxidation of TiN, causing Ti 3+ to Ti 4+ transition, reducing the free electron concentration and further reducing the carrier concentration, resulting in an increase in the resistance of the second composite conductive block.

[0054] Table 1. Resistance and Seebeck coefficient test results of the product in Example 1

[0055] ;

[0056] As shown in Figure 2 , the TiN / SrO (SrTiO3)n (n = 1, 2, …, ∞) second composite conductive block obtained in Example 1 is directly coated on the tissue paper, and the resistance and Seebeck coefficient test diagram of the second composite conductive powder and the second composite conductive block sample show the application of the prepared smearable high-conductivity flexible composite material and the high-conductivity titanium nitride and strontium titanate composite powder in flexible thermoelectric materials.

[0057] As shown in Figure 3 , the infrared emissivity curve of the sample obtained in Example 1. The average infrared emissivity of the sample at the 8-14 μm atmospheric window is higher than 0.95; the average infrared emissivity at the 3-5 μm atmospheric window is higher than 0.94. It shows the application prospect of the prepared smearable high-conductivity flexible composite material and the high-conductivity titanium nitride and strontium titanate composite powder in high-infrared-radiation materials.

[0058] Example 2

[0059] The SrCO3 powder and the TiN powder are mixed according to the molar ratio of 0.8:1, and a proper amount of anhydrous ethanol is added as a solvent for grinding, and the time is 3 h.

[0060] The ground mixture is dried at 80°C for 2 h.

[0061] The dried powder is pressed into a block using a powder tablet press at 3 MPa for 3 min, wrapped with graphite paper, and buried in graphite powder in a muffle furnace at 1200°C for 3-5 h to obtain a smearable high-conductivity TiN / SrO (SrTiO3) n (n = 1, 2, …, ∞) first composite block, which has a resistance of about 12.9 Ω, and after grinding, a first composite conductive powder of titanium nitride and strontium titanate can be obtained.

[0062] The first composite conductive powder is again pressed into a block at 1 MPa for 3 min, and placed in a muffle furnace at 1500°C for graphite burial for 6 h to prepare a relatively dense smearable TiN / SrO (SrTiO3) n (n = 1, 2, …, ∞) second composite conductive block, which has a resistance of about 26.6 Ω.

[0063] Example 3

[0064] SrCO3 powder and TiN powder were mixed in a molar ratio of 0.9:1, and a proper amount of anhydrous ethanol was added as a solvent for grinding, for 3 h.

[0065] The ground mixture was dried at 80°C for 2 h.

[0066] The dried powder was pressed into a block using a powder tablet press at 3 MPa for 3 min, and then wrapped with graphite paper and buried in graphite powder in a muffle furnace at 1200°C for 3-5 h to obtain a smearable high-conductivity TiN / SrO (SrTiO3). n The first composite block (n = 1, 2, …, ∞) had a resistance of about 20.4 Ω, and the first composite conductive powder of titanium nitride and strontium titanate could be obtained after grinding.

[0067] The first composite conductive powder was pressed into a block again at 1 MPa for 3 min, and then placed in a muffle furnace at 1500°C for graphite burial for 6 h to prepare a relatively dense smearable TiN / SrO (SrTiO3). n The second composite conductive block (n = 1, 2, …, ∞) had a resistance of about 45.3 Ω.

[0068] Example 4

[0069] SrCO3 powder and TiN powder were mixed in a molar ratio of 1:1, and a proper amount of anhydrous ethanol was added as a solvent for grinding, for 3 h.

[0070] The ground mixture was dried at 80°C for 2 h.

[0071] The dried powder was pressed into a block using a powder tablet press at 3 MPa for 3 min, and then wrapped with graphite paper and buried in graphite powder in a muffle furnace at 1200°C for 3-5 h to obtain a smearable high-conductivity TiN / SrO (SrTiO3). n The first composite block (n = 1, 2, …, ∞) had a resistance of about 25.8 Ω, and the first composite conductive powder of titanium nitride and strontium titanate could be obtained after grinding.

[0072] The first composite conductive powder was pressed into a block again at 1 MPa for 3 min, and then placed in a muffle furnace at 1500°C for graphite burial for 6 h to prepare a relatively dense smearable TiN / SrO (SrTiO3). n The second composite conductive block (n = 1, 2, …, ∞) had a resistance of about 50.1 Ω.

[0073] As Figure 1As shown, it is shown that the less the SrCO3 content of the raw material SrCO3 powder and TiN powder, the easier the synthesis of TiN / SrTiO3, that is, n = ∞, TiN / SrO (SrTiO3)n (n = 1, 2, …, ∞).

[0074] Example 5

[0075] The SrCO3 powder and the TiN powder were mixed in a molar ratio of 1:0.8, and a proper amount of anhydrous ethanol was added as a solvent for grinding for 3 h.

[0076] The ground mixture was dried at 80°C for 2 h.

[0077] The dried powder was pressed into a block using a powder tablet press at 3 MPa for 3 min, wrapped with graphite paper, and buried in graphite powder in a muffle furnace at 1200°C for 3-5 h to obtain a high-conductivity TiN / SrO (SrTiO3) n (n = 1, 2, …, ∞) first composite block, and a first composite conductive powder of titanium nitride and strontium titanate can be obtained after grinding.

[0078] The first composite conductive powder was pressed into a block at 1 MPa for 3 min and placed in a muffle furnace at 1500°C for graphite burial for 6 h to prepare a relatively dense TiN / SrO (SrTiO3) n (n = 1, 2, …, ∞) second composite conductive block.

[0079] Example 6

[0080] The SrCO3 powder and the TiN powder were mixed in a molar ratio of 0.8:1, and a proper amount of anhydrous ethanol was added as a solvent for grinding for 3 h.

[0081] The ground mixture was dried at 80°C for 2 h.

[0082] The dried powder was pressed into a block using a powder tablet press at 3 MPa for 3 min, wrapped with graphite paper, and buried in graphite powder in a muffle furnace at 1200°C for 3-5 h to obtain a high-conductivity TiN / SrO (SrTiO3) n (n = 1, 2, …, ∞) first composite block, and a first composite conductive powder of titanium nitride and strontium titanate can be obtained after grinding.

[0083] The first composite conductive powder was hot-pressed and sintered at 1200°C and 10 MPa for 2 h to prepare a relatively dense TiN / SrO (SrTiO3) n(n = 1, 2, …, ∞) second composite conductive block, resistance about 110 Ω, smear on dust-free paper about 112.6 MΩ.

[0084] The pressing is only for shaping the sample, and the pressing strength has certain influence on the density thereof, the greater the pressing strength, the greater the density, and the first composite block and the first composite conductive powder have little influence on the resistance.

[0085] In this embodiment, the twice shaping and sintering mode is adopted, and the density of the powder or block prepared by one sintering is increased, thereby increasing the adhesion of the powder on the flexible substrate, and the stability of the high-conductivity flexible composite is increased.

[0086] Example 7

[0087] TiN / SrO (SrTiO3) prepared in Example 1 is mixed with alcohol, and stirred uniformly to prepare a paste. n (n = 1, 2, …, ∞) first composite powder is mixed with alcohol, and stirred uniformly to prepare a paste.

[0088] The paste is smeared on dust-free paper, and dried at 60°C for 5 min.

[0089] The resistance of the prepared flexible composite is tested, and the results show that the resistance is low, and the specific value is related to the smearing amount. Each square centimeter is coated with 0.005 g of the first composite powder, and the resistance is about 3520.6 Ω; each square centimeter is coated with 0.01 g of the first composite powder, and the resistance is about 3359.4 Ω; each square centimeter is coated with 0.02 g of the first composite powder, and the resistance is about 3196.0 Ω.

[0090] Example 8

[0091] TiN / SrO (SrTiO3) prepared in Example 1 is mixed with alcohol, and stirred uniformly to prepare a paste. n (n = 1, 2, …, ∞) second composite conductive powder is mixed with alcohol, and stirred uniformly to prepare a paste.

[0092] The paste is smeared on dust-free paper, and dried at 60°C for 5 min.

[0093] The resistance of the prepared flexible composite is tested, and the results show that the resistance is low, and the specific value is related to the smearing amount. Each square centimeter is coated with 0.005 g of the second composite conductive powder, and the resistance is about 20192.7 Ω; each square centimeter is coated with 0.01 g of the second composite conductive powder, and the resistance is about 23761.2 Ω; each square centimeter is coated with 0.02 g of the second composite conductive powder, and the resistance is about 26568.3 Ω.

[0094] Example 9

[0095] CaCO3 powder and TiN powder were mixed at a molar ratio of 1:1, and an appropriate amount of anhydrous ethanol was added as a solvent for grinding for 3 hours.

[0096] The ground mixture was dried at 80°C for 2 h.

[0097] The dried powder was pressed into a block using a powder press at 3 MPa for 3 min. The block was then wrapped in graphite paper and calcined in a muffle furnace at 1200℃ for 3-5 h to obtain a spreadable, highly conductive TiN / CaTiO3 first composite block. After grinding, a titanium nitride and calcium titanate first composite conductive powder was obtained.

[0098] The first composite conductive powder was pressed into a block at 1 MPa for 3 min and then placed in a muffle furnace for graphite calcination at 1500℃ for 6 h to prepare a relatively dense, spreadable TiN / CaTiO3 second composite conductive block with a resistance of about 41.2 Ω.

[0099] Example 10

[0100] BaCO3 powder and TiN powder were mixed at a molar ratio of 1:1, and an appropriate amount of anhydrous ethanol was added as a solvent for grinding for 3 hours.

[0101] The ground mixture was dried at 80°C for 2 h.

[0102] The dried powder was pressed into a block using a powder press at 3 MPa for 3 min. The block was then wrapped in graphite paper and calcined in a muffle furnace at 1200℃ for 3-5 h to obtain a spreadable, highly conductive TiN / BaTiO3 first composite block. After grinding, a titanium nitride and barium titanate first composite conductive powder was obtained.

[0103] The first composite conductive powder was pressed into a block at 1 MPa for 3 min and then placed in a muffle furnace for graphite calcination at 1500℃ for 6 h to prepare a relatively dense, spreadable TiN / BaTiO3 second composite conductive block with a resistance of about 43.6 Ω.

[0104] like Figure 4 As shown, barium carbonate and calcium carbonate can replace strontium carbonate in the preparation of spreadable, highly conductive, flexible composite materials.

[0105] Therefore, the application of the above-mentioned spreadable high-conductivity flexible composite material in this invention is simple to operate, easy to control, and can rapidly and efficiently synthesize TiN / SrO (SrTiO3). n (n = 1, 2, …, ∞) composite powders are used to create flexible composite materials with excellent electrical properties through a simple coating process.

[0106] It should be pointed out that the above embodiments are only used to illustrate the technical solutions of the present application but not to limit the present application. Although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that they can still make modifications or equivalent replacements to the technical solutions of the present application, and these modifications or equivalent replacements should not make the modified technical solutions deviate from the spirit and scope of the technical solutions of the present application.

Claims

1. A high conductance flexible composite material, characterized in that, A flexible substrate comprising a spreadable titanium nitride and strontium titanate composite conductive material, the spreadable titanium nitride and strontium titanate composite conductive material being TiN / SrO (SrTiO3) n , n = 1, 2, …, ∞; The preparation method of the high-conductivity flexible composite material comprises the following steps: Preparation of the composite conductive material: uniformly mix and grind SrCO3 powder and TiN powder, press into a block, wrap with graphite paper, sinter to obtain a smearable high-conductivity titanium nitride and strontium titanate composite block, grind the high-conductivity titanium nitride and strontium titanate composite block to obtain a composite conductive powder; the molar ratio of SrCO3 to TiN is X:Y, wherein X=1 and 0.7Y<2; Preparation of the high-conductivity flexible composite material: attach the composite conductive material to the flexible substrate to form the high-conductivity flexible composite material; the composite conductive material comprises the high-conductivity titanium nitride and strontium titanate composite block or the composite conductive powder.

2. The high conductance flexible composite of claim 1, wherein, At least one grinding, pressing and sintering is performed during the preparation of the composite conductive powder.

3. The high conductance flexible composite of claim 1, wherein, The flexible substrate comprises an insulating flexible material and a metal foil, wherein the insulating flexible material comprises cellulose, fabric and paper.

4. The high conductance flexible composite of claim 1, wherein, The method for attaching the composite conductive material to the flexible substrate comprises: a solution processing method, in which the powder is dispersed in a solvent to form a suspension, which is then deposited on a substrate by coating or dipping, and a flexible film is formed after evaporation of the solvent to form the high-conductivity flexible composite material; or a melt extrusion method, in which the powder is heated and melted, extruded and formed, and cooled to form the high-conductivity flexible composite material; or a 3D printing technology, in which the powder and a binder are printed layer by layer to prepare a flexible material with a complex structure to form the high-conductivity flexible composite material; or mixed with a solvent to form a paste, which is then applied to the flexible substrate to form the high-conductivity flexible composite material; or the composite block is applied to the flexible substrate, and dried to form the flexible composite material with high conductivity.

5. The high conductance flexible composite of claim 1, wherein, The smearable titanium nitride and strontium titanate composite block is a high-conductivity N-type smearable semiconductor.

6. The high conductance flexible composite of claim 1, wherein, The sintering temperature is 1200-1600℃, the holding time is 1-10h, and the heating rate is 3-10℃ / min.

7. The high conductance flexible composite of claim 1, wherein, The pressure during the pressing is 1MPa-50MPa.

8. Application of the high-conductivity flexible composite material of any one of claims 1-7 in thermoelectric materials and infrared radiation materials.

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