Low-disorder extended π-conjugated organic materials, their preparation methods, and potassium ion batteries

Abstract

The present invention discloses a low-disorder extended π-conjugated organic material, a preparation method thereof, and a potassium ion battery. In the present invention, commercial tetraaminobenzoquinone is used as a synthesis monomer, which is ultrasonically dispersed in a hydrochloric acid solution, and then sodium acetate is added to obtain a turbid liquid II. Then, it is placed in flowing oxygen, heated and stirred, washed, and dried. The obtained powder is put into dimethyl sulfoxide to obtain a turbid liquid III, which is then dried under high temperature and ventilation, washed with ethanol, filtered, and dried in vacuo to obtain the low-disorder extended π-conjugated organic material. The organic material of the present invention can expose more active sites and has a more open framework structure, reducing the potassium ion diffusion path, greatly improving the capacity and rate performance of TAPT, solving the problem that it is difficult to simultaneously improve the capacity, cycle stability, and ionic conductivity when organic electrode materials are applied to potassium ion batteries. Moreover, the preparation method of the present invention has high cost-effectiveness, simple and environmentally friendly preparation process, wide application range, and excellent electrochemical performance.

Description

Technical Field

[0001] The present invention relates to the field of electrochemistry technology, and particularly to a low-disorder extended π-conjugated organic material, a preparation method thereof, and a potassium ion battery. Background Art

[0002] With the global energy structure transitioning towards renewable energy, energy storage technology has become an important support for ensuring stable energy supply. Although renewable energy sources such as wind energy 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 crucial for energy dispatching, power grid peak shaving, and distributed energy systems. In addition, the development of electric transportation, smart grids, and large-scale industrial energy storage has also imposed higher requirements on the safety, cost, and performance of energy storage devices. Currently, as the mainstream energy storage technology, lithium-ion batteries have been widely used in consumer electronics, transportation, and power systems. However, the limited reserves and uneven distribution of lithium resources, along with the high extraction cost, affect their long-term sustainable development. Therefore, developing new energy storage technologies based on more abundant resources is an important direction for achieving sustainable energy utilization. Potassium ion batteries, due to their rich resources, low cost, and good cycle stability, have become a powerful alternative to lithium-ion batteries and have shown broad application prospects in the field of large-scale energy storage in recent years.

[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 bond interactions to achieve reversible potassium ion storage, effectively alleviating the volume expansion problem of the material during the potassium ion insertion / extraction process, thereby improving the cycle stability. In addition, most organic electrode materials are composed of light elements (such as C, H, O, N), which can reduce the dependence on rare metal resources, lower costs, and enhance 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, providing new solutions for large-scale energy storage and renewable energy utilization.

[0004] In potassium-ion batteries, high crystallinity, i.e., high order, has a negative impact on the capacity and electrochemical performance of organic electrode materials. First, high order makes the molecular arrangement too tight, resulting in restricted potassium-ion diffusion, affecting its intercalation / deintercalation kinetics, thus reducing the specific capacity and increasing the polarization effect of the battery. In addition, the potassium ion has a relatively large radius, and it is more difficult to intercalate in high-crystallinity materials, further limiting the reversible potassium storage capacity. Second, high-crystallinity materials have strong rigidity and are difficult to adapt to volume changes during charge and discharge, easily causing electrode cracking or pulverization, and affecting the cycle stability. At the same time, highly regular packing may reduce the formation of the conductive network, limit the electron transport efficiency, and increase the interfacial resistance. Therefore, appropriately reducing the order and improving the structural flexibility and ion diffusion ability of the material are important strategies for optimizing the performance of organic electrode materials. Summary of the Invention

[0005] The object of the present invention is to overcome the negative impact of the capacity and electrochemical performance caused by the highly ordered structure of organic electrode materials, and provides a unique low-disorder extended π-conjugated organic material, its preparation method, and a potassium-ion battery. The method of the present invention uses commercially available tetraaminobenzoquinone (TABQ) as a synthesis monomer and sodium acetate as a catalyst to synthesize a precursor with high crystallinity in an acidic environment, and then obtains a low-disorder extended π-conjugated organic material, namely a disordered tetraaminopyrazinetetrone (L-TAPT) organic electrode material through subsequent disordering strategies. By achieving low disorder of the structure, this organic electrode material can expose more active sites, and at the same time has a more open framework structure, reducing the potassium-ion diffusion path, greatly improving the capacity and rate performance of TAPT. In addition, the low disorder of the structure also endows TAPT with more complex intermolecular weak interactions, reducing its solubility and further enhancing the cycle stability of the TAPT electrode, solving the challenges of low utilization rate of active sites, poor ionic conductivity, and poor cycle stability when highly ordered organic crystals are applied to potassium-ion batteries; in addition, the optimization strategy of the low-disorder extended π-conjugated organic material of the present invention has a simple process and high practicability, can significantly improve the electrochemical performance of TAPT while realizing the large-scale production of the low-disorder extended π-conjugated organic material, thus promoting the practical process of high-performance potassium-ion batteries; when this organic electrode material is applied to new and efficient energy storage devices, it has significant scientific value and practical application prospects.

[0006] The technical solution of the present invention is realized as follows:

[0007] A preparation method of a low-disorder extended π-conjugated organic material, comprising the following steps:

[0008] (1) Add tetraaminobenzoquinone to a hydrochloric acid solution and disperse it by ultrasound to obtain a turbid liquid I;

[0009] (2) Transfer the obtained turbid liquid I to a reaction vessel, add sodium acetate and react to obtain turbid liquid II;

[0010] (3) Transfer the obtained turbid liquid II to an oil bath, introduce flowing oxygen into the reaction vessel, and then heat and stir turbid liquid II to obtain a precipitate;

[0011] (4) Wash and filter the obtained precipitate with deionized water, and vacuum dry it to obtain a powder;

[0012] (5) Add the obtained powder to dimethyl sulfoxide to obtain turbid liquid III;

[0013] (6) Transfer the obtained turbid liquid III to a forced-air high-temperature oven, heat and let it stand, then wash, filter with ethanol, and vacuum dry to obtain a low-disorder extended π-conjugated organic material.

[0014] Further, the turbid liquid I is a reddish-brown turbid liquid; the turbid liquid II is a blackish-red turbid liquid; the turbid liquid III is a dark green turbid liquid; the precipitate is a dark green precipitate; the powder is a dark green powder.

[0015] Further, the reaction vessel is a two-necked flask.

[0016] Further, 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 tetraaminobenzoquinone is 780 - 880 mg; the volume of the hydrochloric acid solution used is 40 - 60 mL.

[0017] Further, in step (2), the mass of sodium acetate is 3.2 - 3.4 g.

[0018] Further, in step (3), the flow rate of the flowing oxygen introduced is 10 mL / min; the temperature of the heating and stirring treatment is 80 - 90 °C, and the heating time is 4 - 6 hours.

[0019] Further, in step (4), the temperature of the vacuum drying is 70 - 90 °C.

[0020] Further, in step (5), the amount of dimethyl sulfoxide used is 80 - 120 mL.

[0021] Further, in step (6), the heating and standing is to heat to 90 - 120 °C and then stand for 10 - 14 hours; the temperature of the vacuum drying is 70 - 90 °C.

[0022] The low-disorder extended π-conjugated organic material prepared by the preparation method of the present invention.

[0023] A potassium-ion battery, which includes a low-disorder extended π-conjugated organic material prepared by the preparation method of the present invention.

[0024] Furthermore, the low-disorder extended π-conjugated organic material serves as the negative electrode active material of the potassium-ion battery.

[0025] Furthermore, the low-disorder extended π-conjugated organic material of the present invention is the disordered tetraaminopyrazine tetrone organic electrode material, denoted as L-TAPT.

[0026] Furthermore, the purity of dimethyl sulfoxide in the present invention is ≥99.9%.

[0027] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0028] 1. The present invention uses commercial tetraaminobenzoquinone (TABQ) as a synthetic monomer, and through self-polymerization, highly crystalline tetraaminopyrazine tetrone (TAPT) is obtained. Then, through disordering treatment, a low-disorder extended π-conjugated organic material, that is, the disordered tetraaminopyrazine tetrone (L-TAPT) organic electrode material, is finally obtained. Due to the more open molecular structure of the obtained disordered tetraaminopyrazine tetrone (L-TAPT) organic electrode material, a large number of active sites are exposed and participate in redox reactions, and it also makes the migration of potassium ions between molecules smoother. The disordered structure makes the intermolecular forces between the matrices more complex, which can further enhance the chemical stability of the material, solving the problem that it is difficult to simultaneously improve the capacity, cycle stability, and ionic conductivity of organic electrode materials.

[0029] 2. The preparation method involved in the present invention has the characteristics of low raw material cost, simple process, high yield, and remarkable improvement effect, and is suitable for large-scale production and application. This method provides a practical optimization strategy for organic materials, and has significant scientific value and practical application prospects in improving the energy density and cycle life of highly crystalline organic electrode materials. Against the background of demanding excellent performance and high reliability for new high-performance energy storage devices, this organic electrode material that combines high energy, high ionic conductivity, and durability shows attractive application potential. Description of the Drawings

[0030] Figure 1 It is a comparison diagram of X-ray diffraction patterns of the disordered tetraaminopyrazine tetrone (L-TAPT) organic electrode material and the highly ordered tetraaminopyrazine tetrone (TAPT) organic electrode material prepared in Example 1. The 2θ in the figure refers to the diffraction angle.

[0031] Figure 2 It is a comparison diagram of infrared spectra of the disordered tetraaminopyrazine tetrone (L-TAPT) organic electrode material and the highly ordered tetraaminopyrazine tetrone (TAPT) organic electrode material prepared in Example 1.

[0032] Figure 3 It is a comparative Raman spectrum diagram of the disordered tetraaminopyrazinetetrone (L-TAPT) organic electrode material and the highly ordered tetraaminopyrazinetetrone (TAPT) organic electrode material prepared in Example 1.

[0033] Figure 4 It is a comparative thermogravimetric diagram of the disordered tetraaminopyrazinetetrone (L-TAPT) organic electrode material and the highly ordered tetraaminopyrazinetetrone (TAPT) organic electrode material prepared in Example 1.

[0034] Figure 5 It is a comparative electron paramagnetic energy spectrum diagram of the disordered tetraaminopyrazinetetrone (L-TAPT) organic electrode material and the highly ordered tetraaminopyrazinetetrone (TAPT) organic electrode material prepared in Example 1.

[0035] Figure 6 It is a molecular structure diagram of the disordered tetraaminopyrazinetetrone (L-TAPT) organic electrode material prepared in Example 1.

[0036] Figure 7 It is a comparative charge-discharge curve diagram of two coin-type potassium ion batteries assembled from the disordered tetraaminopyrazinetetrone (L-TAPT) organic electrode material and the highly ordered tetraaminopyrazinetetrone (TAPT) material in Example 2 at 100 mA / g.

[0037] Figure 8 It is a comparative charge-discharge curve diagram of two coin-type potassium ion batteries assembled from the disordered tetraaminopyrazinetetrone (L-TAPT) organic electrode material and the highly ordered tetraaminopyrazinetetrone (TAPT) material in Example 2 at 2000 mA / g.

[0038] Figure 9 It is a comparative long cycle diagram of two coin-type potassium ion batteries assembled from the disordered tetraaminopyrazinetetrone (L-TAPT) organic electrode material and the highly ordered tetraaminopyrazinetetrone (TAPT) material in Example 2 at 2000 mA / g. Detailed implementation manners

[0039] To better understand the technical content of the present invention, specific examples are provided below to further illustrate the present invention.

[0040] Unless otherwise specified, the experimental methods used in the embodiments of the present invention are all conventional methods.

[0041] Unless otherwise specified, the materials, reagents, etc. used in the embodiments of the present invention can all be obtained from commercial channels.

[0042] Example 1

[0043] A preparation method of a low-disorder extended π-conjugated organic material, comprising the following steps:

[0044] (1) Add 840 mg of tetraaminobenzoquinone to 50 mL of a hydrochloric acid solution with a concentration of 0.4 mol / L, and ultrasonically disperse for 15 minutes to obtain a reddish-brown turbid liquid;

[0045] (2) Transfer the obtained reddish-brown turbid liquid to a two-necked flask, and then add 3.28 g of sodium acetate to the reddish-brown turbid liquid to obtain a blackish-red turbid liquid;

[0046] (3) Transfer the obtained blackish-red turbid liquid to an oil bath, introduce flowing oxygen with a flow rate of 10 mL / min into the two-necked flask, and then heat and stir the blackish-red turbid liquid at 85 °C. After 5 hours, obtain a dark green precipitate;

[0047] (4) Wash and filter the obtained dark green precipitate with deionized water, and dry it in a vacuum environment at 80 °C to obtain a dark green powder;

[0048] (5) Add the obtained dark green powder to 100 mL of dimethyl sulfoxide to obtain a dark green turbid liquid;

[0049] (6) Transfer the obtained dark green turbid liquid to a forced-air high-temperature oven at 100 °C, heat and let it stand for 12 hours, then wash and filter with ethanol, and dry it in a vacuum environment at 80 °C to obtain a low-disorder extended π-conjugated organic material of a dark green powder, which is a disordered tetraaminopyrazinetetrone (L-TAPT) organic electrode material.

[0050] The dark green powder prepared according to the above steps (1) to (4) is a highly ordered tetraaminopyrazinetetrone (TAPT) organic electrode material.

[0051] Perform performance analysis on the prepared disordered tetraaminopyrazinetetrone (L-TAPT) organic electrode material and the highly ordered tetraaminopyrazinetetrone (TAPT) organic electrode material, and the results are as follows:

[0052] As Figure 1 shown, by comparing the X-ray diffraction patterns of the synthesized disordered tetraaminopyrazinetetrone (L-TAPT) organic electrode material and the highly ordered tetraaminopyrazinetetrone (TAPT) organic electrode material of the present invention, except for the strong π peak near 28.1°, the peaks at other positions are significantly weaker than those of TAPT, indicating that L-TAPT has a low degree of disordered structure.

[0053] As Figure 2As shown in the figure, by comparing the infrared spectra of the disordered tetraaminopyrazine tetrone (L-TAPT) organic electrode material synthesized in the present invention with the highly ordered tetraaminopyrazine tetrone (TAPT) organic electrode material, it can be seen that the peak positions of the two do not change significantly, indicating that L-TAPT retains the functional group characteristics of highly crystalline TAPT. However, at around 3400 cm -1 near the position representing the N-H group, L-TAPT has a broader peak, indicating that there are more complex hydrogen bond interactions between its molecules.

[0054] As Figure 3 shown in the figure, by comparing the Raman spectra of the disordered tetraaminopyrazine tetrone (L-TAPT) organic electrode material synthesized in the present invention with the highly ordered tetraaminopyrazine tetrone (TAPT) organic electrode material, it can be seen that the Raman spectra of the two are basically the same, both showing a high ID / IG value, indicating that both have a two-dimensional structure.

[0055] As Figure 4 shown in the figure, by comparing the thermogravimetry of the disordered tetraaminopyrazine tetrone (L-TAPT) organic electrode material synthesized in the present invention with the highly ordered tetraaminopyrazine tetrone (TAPT) organic electrode material, due to the low degree of disordered structure, the molecular arrangement regularity of L-TAPT is low, so it is more likely to decompose compared to TAPT in high-temperature tests.

[0056] As Figure 5 shown in the figure, by comparing the electron paramagnetic energy spectra of the disordered tetraaminopyrazine tetrone (L-TAPT) organic electrode material synthesized in the present invention with the highly ordered tetraaminopyrazine tetrone (TAPT) organic electrode material, it can be seen that the Gaussian signal of L-TAPT in the electron paramagnetic energy spectrum is weak, indicating that the radical content is low, which can bring higher electrochemical stability, fewer side reactions, better reversibility, and more uniform electron transport, thus improving the overall performance of the material in the battery.

[0057] As Figure 6 shown in the figure, the molecular structure diagram of the disordered tetraaminopyrazine tetrone (L-TAPT) synthesized in the present invention is given, which has a high density of active sites.

[0058] Example 2

[0059] The disordered tetraaminopyrazine tetrone (L-TAPT) organic electrode material obtained in Example 1 above was assembled with a potassium metal electrode sheet into a button-type potassium ion battery as follows:

[0060] The disordered tetraaminopyrazinetetrone (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, conductive agent, and 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 uniformly coated on the copper foil. The electrode sheet is made by stamping the copper foil into a round sheet with a diameter of 10 mm, and the mass loading of the stamped electrode sheet is 1-2 mg / cm². The CR2016 coin-type battery is assembled in an argon glove box. The potassium metal sheet and glass fiber filter paper (GF / F) are used as the counter electrode and separator 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.

[0061] Similarly, the highly ordered tetraaminopyrazinetetrone (TAPT) organic electrode material is assembled with the potassium metal electrode sheet into a coin-type potassium ion battery according to the above method, and then the performances of the two prepared coin-type potassium ion batteries are measured respectively. The results are as follows:

[0062] The charge-discharge curves of the two coin-type potassium ion batteries at a small current density of 100 mA / g are compared as Figure 7 shown: Compared with the highly ordered tetraaminopyrazinetetrone (TAPT), the disordered tetraaminopyrazinetetrone (L-TAPT) organic electrode material shows a higher discharge specific capacity, about 574 mAh / g, while TAPT is only 437 mAh / g, and the former also shows a more obvious charge-discharge plateau, indicating that the utilization rate of the active sites of L-TAPT is significantly higher than that of TAPT.

[0063] The charge-discharge curves of the two coin-type potassium ion batteries at a large current density of 2000 mA / g are compared as Figure 8 shown: Compared with the highly ordered tetraaminopyrazinetetrone (TAPT), the disordered tetraaminopyrazinetetrone (L-TAPT) organic electrode material shows lower polarization. Even under the condition of large current testing, it can still maintain the shape of the charge-discharge curve, indicating that it has better ionic conductivity.

[0064] The long-term cycling of the two coin-type potassium ion batteries at a large current density of 2000 mA / g is compared as Figure 9 shown: Compared with the highly ordered tetraaminopyrazinetetrone (TAPT), after 200 charge-discharge cycles, the reversible specific capacity of L-TAPT is 302.2 mAh / g, while TAPT is only 175.4 mAh / g. After disordering treatment, the capacity of TAPT is increased by 72%.

[0065] The above results show that due to its disordered molecular structure, the disordered tetraaminopyrazinetetrone (L-TAPT) organic electrode material prepared by the present invention exposes more active sites. The more open framework model shortens the diffusion distance of potassium ions. In addition, it endows more complex intermolecular forces, solving the difficulty that it is difficult to simultaneously improve the capacity, ionic conductivity and cycle stability of highly crystalline and highly ordered organic electrode materials; the preparation method of this low-disorder extended π-conjugated organic material has low cost, simple process, high yield and remarkable 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 due to its high energy density, high ionic conductivity and excellent durability.

[0066] Example 3

[0067] A preparation method of a low-disorder extended π-conjugated organic material, comprising the following steps:

[0068] (1) Add 800 mg of tetraaminobenzoquinone to 45 ml of a hydrochloric acid solution with a concentration of 0.5 mol / L, and ultrasonicate for 15 minutes to fully disperse to obtain a reddish-brown turbid liquid;

[0069] (2) Transfer the obtained reddish-brown turbid liquid to a two-necked flask, and then add 3.4 g of sodium acetate to the reddish-brown turbid liquid to obtain a blackish-red turbid liquid;

[0070] (3) Transfer the obtained blackish-red turbid liquid to an oil bath, introduce flowing oxygen with a flow rate of 10 ml / min into the two-necked flask, and then heat and stir the blackish-red turbid liquid at 85 °C. After 5 hours, obtain a dark green precipitate;

[0071] (4) Wash and filter the obtained dark green precipitate with deionized water, and dry it in a vacuum environment at 80 °C to obtain a dark green powder;

[0072] (5) Add the obtained dark green powder to 80 ml of dimethyl sulfoxide to obtain a dark green turbid liquid;

[0073] (6) Transfer the obtained dark green turbid liquid to a blast high-temperature oven at 100 °C, heat and let it stand for 12 hours, then wash and filter with ethanol, and dry it in a vacuum environment at 80 °C to obtain a low-disorder extended π-conjugated organic material of dark green powder, which is a disordered tetraaminopyrazinetetrone (L-TAPT) organic electrode material.

[0074] Example 4

[0075] A preparation method of a low-disorder extended π-conjugated organic material, comprising the following steps:

[0076] (1) Add 880 mg of tetraaminobenzoquinone to 50 mL of hydrochloric acid solution with a concentration of 0.4 mol / L, and ultrasonicate for 15 minutes to fully disperse, obtaining a reddish-brown turbid liquid;

[0077] (2) Transfer the obtained reddish-brown turbid liquid to a two-necked flask, and then add 3.5 g of sodium acetate to the reddish-brown turbid liquid, obtaining a blackish-red turbid liquid;

[0078] (3) Transfer the obtained blackish-red turbid liquid to an oil bath, introduce flowing oxygen with a flow rate of 15 mL / min into the two-necked flask, and then heat and stir the blackish-red turbid liquid at 85 °C. After 5 hours, obtain a dark green precipitate;

[0079] (4) Wash and filter the obtained dark green precipitate with deionized water, and dry it in a vacuum environment at 80 °C to obtain a dark green powder;

[0080] (5) Add the obtained dark green powder to 100 mL of dimethyl sulfoxide to obtain a dark green turbid liquid;

[0081] (6) Transfer the obtained dark green turbid liquid to a forced-air high-temperature oven at 100 °C, heat and let it stand for 12 hours, then wash and filter with ethanol, and dry it in a vacuum environment at 80 °C to obtain a low-disorder extended π-conjugated organic material of dark green powder, which is a disordered tetraaminopyrazinetetrone (L-TAPT) organic electrode material.

[0082] The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A preparation method of a low-disorder extended π-conjugated organic material, characterized in that It includes the following steps: (1) Add tetraaminobenzoquinone into a hydrochloric acid solution, and perform ultrasonic dispersion to obtain turbid liquid I; (2) Transfer the obtained turbid liquid I to a reaction vessel, add sodium acetate for reaction to obtain turbid liquid II; (3) Transfer the obtained turbid liquid II to an oil bath, introduce flowing oxygen into the reaction vessel, and then perform heating and stirring treatment on the turbid liquid II to obtain a precipitate; (4) Wash and filter the obtained precipitate with deionized water, and perform vacuum drying to obtain a powder; (5) Add the obtained powder into dimethyl sulfoxide to obtain turbid liquid III; (6) Transfer the obtained turbid liquid III to a forced-air high-temperature oven, heat and let it stand, then wash and filter with ethanol, and perform vacuum drying to obtain the low-disorder extended π-conjugated organic material.

2. The preparation method of the low-disorder 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 tetraaminobenzoquinone is 780 - 880 mg; the volume dosage of the hydrochloric acid solution is 40 - 60 mL.

3. The preparation method of the low-disorder extended π-conjugated organic material according to claim 1, characterized in that In step (2), the mass of sodium acetate is 3.2 - 3.4 g.

4. The preparation method of the low-disorder extended π-conjugated organic material according to claim 1, characterized in that, In step (3), the flow rate of the flowing oxygen introduced 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 preparation method of the low-disorder extended π-conjugated organic material according to claim 1, wherein In step (4), the temperature of the vacuum drying is 70 - 90 °C.

6. The preparation method of the low-disorder extended π-conjugated organic material according to claim 1, wherein In step (5), the dosage of dimethyl sulfoxide is 80 - 120 mL.

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

8. A potassium ion battery, characterized in that, The potassium ion battery includes the low-disorder extended π-conjugated organic material prepared by the preparation method according to any one of claims 1 - 7.

9. The potassium ion battery according to claim 8, wherein The low-disorder extended π-conjugated organic material is used as the negative electrode active material of the potassium ion battery.

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