Low-disordered expanded pi conjugated organic material, preparation method thereof and potassium ion battery

Abstract

The invention discloses a low-disordered expanded pi conjugated organic material, a preparation method thereof and a potassium ion battery. The preparation method comprises the following steps: by taking commercial tetraaminobenzoquinone as a synthetic monomer, adding a hydrochloric acid solution for ultrasonic dispersion, then adding sodium acetate to obtain a turbid solution II, then placing the turbid solution II in flowing oxygen, heating and stirring, then washing and drying, putting the obtained powder into dimethyl sulfoxide to obtain a turbid solution III, then ventilating and drying at high temperature, then washing with ethanol, and filtering to obtain a target product. And drying in vacuum to obtain the low-disordered expanded pi conjugated organic material. The organic material can expose more active sites and has a more open skeleton structure, potassium ion diffusion paths are reduced, the capacity and rate capability of TAPT can be greatly improved, the problem that the capacity, cycling stability and ionic conductivity are difficult to improve at the same time when the organic electrode material is applied to a potassium ion battery is solved, and the application prospect is wide. The preparation method is high in cost benefit, simple, convenient and environment-friendly in preparation process, wide in application range and excellent in electrochemical performance.

Description

Technical Field

[0001] The invention relates to the field of electrochemical technology, and in particular to a low-disordered extended π-conjugated organic material and a preparation method thereof, and a potassium ion battery. Background Art

[0002] As the global energy structure transforms to renewable energy, energy storage technology has become an important support for ensuring a stable energy supply. Although renewable energy sources such as wind and solar energy are clean and environmentally friendly, they are intermittent and volatile, making it difficult to achieve stable power supply. Therefore, efficient energy storage technology is essential for energy scheduling, grid peak regulation, and distributed energy systems. In addition, the development of electric transportation, smart grids, and large-scale industrial energy storage has also put forward higher requirements for the safety, cost, and performance of energy storage equipment. At present, lithium-ion batteries, as the mainstream energy storage technology, have been widely used in consumer electronics, transportation, and power systems. However, the reserves of lithium resources are limited and unevenly distributed, and the mining cost is high, which affects its long-term sustainable development. Therefore, the development of new energy storage technologies based on more abundant resources is an important direction for achieving sustainable energy utilization. Potassium-ion batteries have become a powerful alternative to lithium-ion batteries due to their abundant resources, low cost, and good cycle stability. In recent years, they have shown broad application prospects in the field of large-scale energy storage.

[0003] Organic electrode materials have shown important advantages in potassium ion batteries due to their diverse structures, wide sources and environmental friendliness. The electrochemical properties of organic electrode materials can be regulated through molecular design, making them more adjustable. At the same time, they rely on covalent bonds to achieve reversible potassium ion storage, which can effectively alleviate the volume expansion problem of materials during potassium ion insertion / extraction, thereby improving cycle stability. In addition, organic electrode materials are mostly composed of light elements (such as C, H, O, N), which can reduce dependence on rare metal resources, reduce costs and improve sustainability. Therefore, the application of organic electrode materials in potassium ion batteries is expected to promote the development of low-cost and sustainable energy storage technologies, and provide new solutions for large-scale energy storage and renewable energy utilization.

[0004] In potassium-ion batteries, high crystallinity, that is, high order, can have a negative impact on the capacity and electrochemical properties of organic electrode materials. First, high order makes the molecules arranged too closely, resulting in limited diffusion of potassium ions, affecting their insertion / extraction kinetics, thereby reducing the specific capacity and increasing the polarization effect of the battery. In addition, potassium ions have a larger radius, making it more difficult to embed in highly crystalline materials, further limiting the reversible potassium storage capacity. Secondly, highly crystalline materials have strong rigidity and are difficult to adapt to volume changes during charging and discharging, which can easily cause electrode cracking or pulverization, affecting cycle stability. At the same time, highly regular stacking may reduce the formation of a conductive network, limit electron transfer efficiency, and increase interface resistance. Therefore, appropriately reducing order and improving the structural flexibility and ion diffusion capacity of materials are important strategies for optimizing the performance of organic electrode materials. Summary of the invention

[0005] The purpose of the present invention is to overcome the negative impact of capacity and electrochemical performance of organic electrode materials due to their highly ordered structures, and to provide a unique low-disordered extended π-conjugated organic material and its preparation method and potassium ion battery. The method of the present invention uses commercial tetraaminobenzoquinone (TABQ) as a synthetic monomer and sodium acetate as a catalyst to synthesize a precursor with high crystallinity in an acidic environment, and then obtains a low-disordered extended π-conjugated organic material through a subsequent disordering strategy, namely, a disordered tetraaminopyrazinetetraketone (L-TAPT) organic electrode material. The organic electrode material can expose more active sites by achieving low structural disorder, and at the same time has a more open skeleton structure, which reduces the diffusion path of potassium ions and greatly improves the capacity and rate performance of TAPT. In addition, the low structural disorder also gives TAPT more complex intermolecular weak forces, reduces its solubility, further enhances the cycle stability of the TAPT electrode, and solves the challenges of low active site utilization, poor ionic conductivity and cycle stability when highly ordered organic crystals are used in potassium ion batteries; in addition, the optimization strategy of the low-disordered extended π-conjugated organic material of the present invention has a simple process and high practicality, and can achieve large-scale production of low-disordered extended π-conjugated organic materials while significantly improving the electrochemical performance of TAPT, thereby promoting the practical application of high-performance potassium ion batteries; the organic electrode material has significant scientific value and practical application prospects in the application of new high-efficiency energy storage devices.

[0006] The technical solution of the present invention is achieved in this way: A method for preparing a low-disordered extended π-conjugated organic material comprises the following steps: (1) Add tetraaminobenzoquinone to hydrochloric acid solution and disperse by ultrasonic to obtain turbid solution I; (2) transferring the obtained turbid liquid I to a reaction container, adding sodium acetate to react, and obtaining turbid liquid II; (3) The obtained turbid liquid II is transferred to an oil bath, flowing oxygen is introduced into the reaction vessel, and the turbid liquid II is heated and stirred to obtain a precipitate; (4) washing the obtained precipitate with deionized water, filtering it, and vacuum drying it to obtain a powder; (5) adding the obtained powder into dimethyl sulfoxide to obtain a turbid solution III; (6) The obtained turbid liquid III is transferred to a high-temperature box with a blast fan, heated and allowed to stand, and then washed with ethanol, filtered, and vacuum dried to obtain a low-disordered extended π-conjugated organic material.

[0007] Furthermore, the turbid liquid I is a reddish brown turbid liquid; the turbid liquid II is a black red turbid liquid; the turbid liquid III is a dark green turbid liquid; the precipitate is a dark green precipitate; and the powder is a dark green powder.

[0008] Furthermore, the reaction container is a double-necked flask.

[0009] Furthermore, in step (1), the ultrasonic dispersion time is 14-20 minutes; the concentration of the hydrochloric acid solution is 0.3-0.6 mol / L; the mass of the tetraaminobenzoquinone is 780-880 mg; and the volume of the hydrochloric acid solution is 40-60 ml.

[0010] Furthermore, in step (2), the mass of the sodium acetate is 3.2-3.4 grams.

[0011] Furthermore, in step (3), the flow rate of the flowing oxygen is 10 ml / min; the temperature of the heating and stirring treatment is 80-90° C., and the heating time is 4-6 hours.

[0012] Furthermore, in step (4), the vacuum drying temperature is 70-90°C.

[0013] Furthermore, in step (5), the amount of dimethyl sulfoxide used is 80-120 ml.

[0014] Furthermore, in step (6), the heating and standing is heating to 90-120°C and then standing for 10-14 hours; the vacuum drying temperature is 70-90°C.

[0015] The low-disordered extended π-conjugated organic material is prepared by the preparation method of the invention.

[0016] A potassium ion battery comprises a low-disordered extended π-conjugated organic material prepared by the preparation method of the invention.

[0017] Furthermore, the low-disordered extended π-conjugated organic material is used as a negative electrode active material for a potassium ion battery.

[0018] Furthermore, the low-disordered extended π-conjugated organic material of the present invention is a disordered tetraaminopyrazinetetraone organic electrode material, denoted as L-TAPT.

[0019] Furthermore, the purity of the dimethyl sulfoxide of the present invention is ≥99.9%.

[0020] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention uses commercial tetraaminobenzoquinone (TABQ) as a synthetic monomer, obtains tetraaminopyrazinetetraketone (TAPT) with high crystallinity through self-polymerization, and then undergoes disordering treatment to finally obtain a low-disordered extended π-conjugated organic material, namely, disordered tetraaminopyrazinetetraketone (L-TAPT) organic electrode material. The obtained disordered tetraaminopyrazinetetraketone (L-TAPT) organic electrode material has a more open molecular structure, a large number of active sites are exposed and participate in redox reactions, and the migration of potassium ions between molecules becomes smoother. The disordered structure makes the molecular forces between the matrix more complex, which can further enhance the chemical stability of the material and solve the problem that the capacity, cycle stability and ionic conductivity of organic electrode materials are difficult to improve at the same time.

[0021] 2. The preparation method involved in the present invention has the characteristics of low raw material cost, simple process, high yield and significant improvement effect, and is suitable for large-scale production and application. The method provides a feasible organic material optimization strategy, which has significant scientific value and practical application prospects in improving the energy density and cycle life of high-crystallinity organic electrode materials. In the context of requiring excellent performance and high reliability for new high-efficiency energy storage devices, this organic electrode material with high energy, high ionic conductivity and long-lasting durability shows attractive application potential. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a comparison diagram of X-ray diffraction patterns of the disordered tetraaminopyrazinetetraketone (L-TAPT) organic electrode material prepared in Example 1 and the highly ordered tetraaminopyrazinetetraketone (TAPT) organic electrode material, where 2θ in the diagram refers to the diffraction angle.

[0023] Figure 2 This is a comparison diagram of infrared spectra of the disordered tetraaminopyrazinetetraone (L-TAPT) organic electrode material prepared in Example 1 and the highly ordered tetraaminopyrazinetetraone (TAPT) organic electrode material.

[0024] Figure 3 This is a comparison diagram of the Raman spectra of the disordered tetraaminopyrazinetetraone (L-TAPT) organic electrode material prepared in Example 1 and the highly ordered tetraaminopyrazinetetraone (TAPT) organic electrode material.

[0025] Figure 4 This is a thermogravimetric comparison diagram of the disordered tetraaminopyrazinetetraketone (L-TAPT) organic electrode material prepared in Example 1 and the highly ordered tetraaminopyrazinetetraketone (TAPT) organic electrode material.

[0026] Figure 5 This is a comparison diagram of the electron paramagnetic energy spectra of the disordered tetraaminopyrazinetetraone (L-TAPT) organic electrode material prepared in Example 1 and the highly ordered tetraaminopyrazinetetraone (TAPT) organic electrode material.

[0027] Figure 6 This is a molecular structure diagram of the disordered tetraaminopyrazinetetraketone (L-TAPT) organic electrode material prepared in Example 1.

[0028] Figure 7 This is a comparison chart of the charge and discharge curves of two button-type potassium ion batteries assembled from the disordered tetraaminopyrazinetetraone (L-TAPT) organic electrode material of Example 2 and the highly ordered tetraaminopyrazinetetraone (TAPT) material at 100 mA / g.

[0029] Figure 8 This is a comparison chart of the charge and discharge curves of two button-type potassium ion batteries assembled from the disordered tetraaminopyrazinetetraone (L-TAPT) organic electrode material of Example 2 and the highly ordered tetraaminopyrazinetetraone (TAPT) material at 2000 mA / g.

[0030] Fig. 9 This is a long cycle comparison chart of two button-type potassium ion batteries assembled from the disordered tetraaminopyrazinetetraone (L-TAPT) organic electrode material of Example 2 and the highly ordered tetraaminopyrazinetetraone (TAPT) material at 2000 mA / g. DETAILED DESCRIPTION

[0031] In order to better understand the technical content of the present invention, specific embodiments are provided below to further illustrate the present invention.

[0032] Unless otherwise specified, the experimental methods used in the embodiments of the present invention are all conventional methods.

[0033] Unless otherwise specified, the materials, reagents, etc. used in the embodiments of the present invention can be obtained from commercial sources.

[0034] Example 1 A method for preparing a low-disordered extended π-conjugated organic material comprises the following steps: (1) Add 840 mg of tetraaminobenzoquinone to 50 ml of 0.4 mol / L hydrochloric acid solution and perform ultrasonic treatment for 15 minutes to fully disperse the solution to obtain a reddish brown turbid solution; (2) The obtained reddish brown turbid liquid was transferred to a two-necked flask, and 3.28 g of sodium acetate was added to the reddish brown turbid liquid to obtain a dark red turbid liquid; (3) The obtained dark red turbid liquid was transferred to an oil bath, and flowing oxygen at a flow rate of 10 ml / min was introduced into the double-necked flask. The dark red turbid liquid was then heated and stirred at 85°C. After 5 hours, a dark green precipitate was obtained; (4) The obtained dark green precipitate was washed with deionized water, filtered, and dried under vacuum at 80°C to obtain a dark green powder; (5) Add the obtained dark green powder into 100 ml of dimethyl sulfoxide to obtain a dark green turbid liquid; (6) The dark green turbid liquid was transferred to a 100°C high temperature oven, heated and allowed to stand for 12 hours, washed with ethanol, filtered, and dried at 80°C in a vacuum environment to obtain a dark green powder of a low-disordered extended π-conjugated organic material, namely, a disordered tetraaminopyrazinetetraone (L-TAPT) organic electrode material.

[0035] The dark green powder prepared according to the above steps (1) to (4) is a highly ordered tetraaminopyrazinetetraketone (TAPT) organic electrode material.

[0036] The prepared disordered tetraaminopyrazinetetraketone (L-TAPT) organic electrode material and highly ordered tetraaminopyrazinetetraketone (TAPT) organic electrode material were subjected to performance analysis, and the results are as follows: like Figure 1 As shown, by comparing the X-ray diffraction patterns of the disordered tetraaminopyrazinetetraone (L-TAPT) organic electrode material synthesized by the present invention with that of the highly ordered tetraaminopyrazinetetraone (TAPT) organic electrode material, it can be seen that, except for the strong π peak near 28.1°, the peaks at other positions are significantly weaker than those of TAPT, which indicates that L-TAPT has a low degree of disordered structure.

[0037] like Figure 2 As shown in FIG. 1 , the infrared spectra of the disordered tetraaminopyrazinetetraketone (L-TAPT) organic electrode material synthesized by the present invention are compared with the highly ordered tetraaminopyrazinetetraketone (TAPT) organic electrode material. It can be seen that the peak positions of the two have not changed significantly, indicating that L-TAPT retains the functional group characteristics of high-crystallinity TAPT, but at 3400 cm -1 Nearby, representing the NH group, L-TAPT has a broader peak, which indicates that there are more complex hydrogen bonds between its molecules.

[0038] like Figure 3As shown, by comparing the Raman spectra of the disordered tetraaminopyrazinetetraone (L-TAPT) organic electrode material synthesized by the present invention with that of the highly ordered tetraaminopyrazinetetraone (TAPT) organic electrode material, it can be seen that the Raman spectra of the two are basically consistent, both showing high ID / IG values, indicating that both have a two-dimensional structure.

[0039] like Figure 4 As shown, from the thermogravimetric comparison of the disordered tetraaminopyrazinetetraketone (L-TAPT) organic electrode material synthesized by the present invention and the highly ordered tetraaminopyrazinetetraketone (TAPT) organic electrode material, it can be seen that due to the low disordered structure, the molecular arrangement regularity of L-TAPT is low, and therefore it is easier to decompose than TAPT in high temperature tests.

[0040] like Figure 5 As shown, by comparing the electron paramagnetic energy spectra of the disordered tetraaminopyrazinetetraketone (L-TAPT) organic electrode material synthesized by the present invention with that of the highly ordered tetraaminopyrazinetetraketone (TAPT) organic electrode material, it can be seen that the Gaussian signal of L-TAPT in the electron paramagnetic energy spectrum is weaker, indicating that the free radical content is lower, which can bring higher electrochemical stability, fewer side reactions, better reversibility and more uniform electron transport, thereby improving the overall performance of the material in the battery.

[0041] like Figure 6 As shown, a molecular structure diagram of disordered tetraaminopyrazinetetraone (L-TAPT) synthesized by the present invention is given, which has a high active site density.

[0042] Example 2 The disordered tetraaminopyrazinetetraketone (L-TAPT) organic electrode material obtained in the above Example 1 and a potassium metal electrode sheet are assembled into a button-type potassium ion battery, as follows: The disordered tetraaminopyrazinetetraketone (L-TAPT) organic electrode material prepared in Example 1 of the present invention is used as the negative electrode active material of the potassium ion battery, conductive carbon black is used as the conductive agent, and carboxymethyl cellulose is used as the binder. The mass ratio of the negative electrode active material, the conductive agent, and the binder of the potassium ion battery is 5:4:1. After mixing them in proportion, deionized water is added to make a slurry, which is evenly coated on the copper foil. The electrode sheet is made by punching the copper foil into a disc with a diameter of 10 mm. The mass loading of the punched electrode sheet is 1-2 mg / cm2, and the CR2016 button battery is assembled in an argon glove box. Potassium metal sheet and glass fiber filter paper (GF / F) are used as the counter electrode and diaphragm, respectively. The potassium ion electrolyte is potassium bis(fluorosulfonyl)imide dissolved in ethylene carbonate (EC) and ethyl methyl carbonate (EMC) (volume ratio 1:1), with a concentration of 5 mol / L.

[0043] Similarly, according to the above method, the highly ordered tetraaminopyrazinetetraketone (TAPT) organic electrode material and the potassium metal electrode sheet were assembled into a button-type potassium ion battery, and then the performance of the two button-type potassium ion batteries prepared were measured respectively. The results are as follows: Comparison of charge and discharge curves of two button-type potassium ion batteries at a low current density of 100 mA / g Figure 7 As shown in the figure: Disordered tetraaminopyrazinetetraketone (L-TAPT) organic electrode material compared with highly ordered tetraaminopyrazinetetraketone (TAPT), L-TAPT shows a higher discharge specific capacity of about 574 mAh / g, while TAPT is only 437 mAh / g, and the former also shows a more obvious charge and discharge platform, which indicates that the active site utilization rate of L-TAPT is significantly higher than that of TAPT.

[0044] Comparison of the charge and discharge curves of two button-type potassium ion batteries at a high current density of 2000 mA / g Figure 8 As shown: Compared with highly ordered tetraaminopyrazinetetraketone (TAPT), disordered tetraaminopyrazinetetraketone (L-TAPT) organic electrode material L-TAPT exhibits lower polarization phenomenon and can still maintain the shape of the charge and discharge curve even under large current testing, indicating that it has better ionic conductivity.

[0045] Comparison of long cycle performance of two button-type potassium ion batteries at a high current density of 2000 mA / g Fig. 9 As shown: Compared with highly ordered tetraaminopyrazinetetraketone (TAPT), the disordered tetraaminopyrazinetetraketone (L-TAPT) organic electrode material has a reversible specific capacity of 302.2 mAh / g after 200 charge and discharge cycles, while that of TAPT is only 175.4 mAh / g. After disorder treatment, the capacity of TAPT is increased by 72%.

[0046] The above results show that the disordered tetraaminopyrazinetetraketone (L-TAPT) organic electrode material prepared by the present invention exposes more active sites due to its disordered molecular structure, and the more open skeleton model shortens the diffusion distance of potassium ions. In addition, it also gives it more complex intermolecular forces, which solves the difficulty of simultaneously improving the capacity, ionic conductivity and cycle stability of high crystallinity, that is, high-ordered organic electrode materials; the preparation method of the low-disordered extended π-conjugated organic material has low cost, simple process, high yield, significant optimization effect, and is suitable for large-scale production. This method provides a feasible strategy for the optimization of organic electrode materials and has important application prospects in improving energy density and cycle life. Under the demand for high-performance energy storage, this material shows broad potential with its high energy density, high ionic conductivity and excellent durability.

[0047] Example 3 A method for preparing a low-disordered extended π-conjugated organic material comprises the following steps: (1) Add 800 mg of tetraaminobenzoquinone to 45 ml of 0.5 mol / L hydrochloric acid solution and perform ultrasonic treatment for 15 minutes to fully disperse the solution to obtain a reddish brown turbid solution; (2) The obtained reddish brown turbid liquid was transferred to a two-necked flask, and 3.4 g of sodium acetate was added to the reddish brown turbid liquid to obtain a dark red turbid liquid; (3) The obtained dark red turbid liquid was transferred to an oil bath, and flowing oxygen at a flow rate of 10 ml / min was introduced into the double-necked flask. The dark red turbid liquid was then heated and stirred at 85°C. After 5 hours, a dark green precipitate was obtained; (4) The obtained dark green precipitate was washed with deionized water, filtered, and dried under vacuum at 80°C to obtain a dark green powder; (5) Add the obtained dark green powder into 80 ml of dimethyl sulfoxide to obtain a dark green turbid liquid; (6) The dark green turbid liquid was transferred to a 100°C high temperature oven, heated and allowed to stand for 12 hours, washed with ethanol, filtered, and dried at 80°C in a vacuum environment to obtain a dark green powder of a low-disordered extended π-conjugated organic material, namely, a disordered tetraaminopyrazinetetraone (L-TAPT) organic electrode material.

[0048] Example 4 A method for preparing a low-disordered extended π-conjugated organic material comprises the following steps: (1) Add 880 mg of tetraaminobenzoquinone to 50 ml of 0.4 mol / L hydrochloric acid solution and perform ultrasonic treatment for 15 minutes to fully disperse the solution to obtain a reddish brown turbid solution; (2) The obtained reddish brown turbid liquid was transferred to a two-necked flask, and 3.5 g of sodium acetate was added to the reddish brown turbid liquid to obtain a dark red turbid liquid; (3) The obtained dark red turbid liquid was transferred to an oil bath, and flowing oxygen at a flow rate of 15 ml / min was introduced into the double-necked flask. The dark red turbid liquid was then heated and stirred at 85°C. After 5 hours, a dark green precipitate was obtained; (4) The obtained dark green precipitate was washed with deionized water, filtered, and dried under vacuum at 80°C to obtain a dark green powder; (5) Add the obtained dark green powder into 100 ml of dimethyl sulfoxide to obtain a dark green turbid liquid; (6) The dark green turbid liquid was transferred to a 100°C high temperature oven, heated and allowed to stand for 12 hours, washed with ethanol, filtered, and dried at 80°C in a vacuum environment to obtain a dark green powder of a low-disordered extended π-conjugated organic material, namely, a disordered tetraaminopyrazinetetraone (L-TAPT) organic electrode material.

[0049] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for preparing a low-disordered extended π-conjugated organic material, characterized in that: The following steps are involved: (1) Add tetraaminobenzoquinone to hydrochloric acid solution and disperse by ultrasonic to obtain turbid solution I; (2) transferring the obtained turbid solution I to a reaction container, adding sodium acetate to react, and obtaining turbid solution II; (3) The obtained turbid liquid II is transferred to an oil bath, flowing oxygen is introduced into the reaction vessel, and the turbid liquid II is heated and stirred to obtain a precipitate; (4) washing the obtained precipitate with deionized water, filtering it, and vacuum drying it to obtain a powder; (5) adding the obtained powder into dimethyl sulfoxide to obtain a turbid solution III; (6) The obtained turbid liquid III is transferred to a high-temperature box with a blast fan, heated and allowed to stand, and then washed with ethanol, filtered, and vacuum dried to obtain a low-disordered extended π-conjugated organic material.

2. The method for preparing a low-disordered extended π-conjugated organic material according to claim 1, characterized in that: In step (1), the ultrasonic dispersion time is 14-20 minutes; the concentration of the hydrochloric acid solution is 0.3-0.6 mol / L; the mass of the tetraaminobenzoquinone is 780-880 mg; and the volume of the hydrochloric acid solution is 40-60 ml.

3. The method for preparing a low-disordered extended π-conjugated organic material according to claim 1, characterized in that: In step (2), the mass of the sodium acetate is 3.2-3.4 grams.

4. The method for preparing a low-disordered extended π-conjugated organic material according to claim 1, characterized in that: In step (3), the flow rate of the flowing oxygen is 10 ml / min; the temperature of the heating and stirring treatment is 80-90° C., and the heating time is 4-6 hours.

5. The method for preparing a low-disordered extended π-conjugated organic material according to claim 1, characterized in that: In step (4), the vacuum drying temperature is 70-90°C.

6. The method for preparing a low-disordered extended π-conjugated organic material according to claim 1, characterized in that: In step (5), the amount of dimethyl sulfoxide used is 80-120 ml.

7. The method for preparing a low-disordered extended π-conjugated organic material according to claim 1, characterized in that: In step (6), the heating and standing is heating to 90-120°C and then standing for 10-14 hours; the vacuum drying temperature is 70-90°C.

8. A low-disordered extended π-conjugated organic material prepared by the preparation method according to any one of claims 1 to 7.

9. A potassium ion battery, characterized in that: The potassium ion battery comprises a low-disordered extended π-conjugated organic material prepared by the preparation method according to any one of claims 1 to 7.

10. The potassium ion battery according to claim 9, characterized in that: The low-disordered extended π-conjugated organic material is used as a negative electrode active material for a potassium ion battery.

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