CN114744163B - Organic positive electrode material, preparation method and application thereof in alkali metal ion battery - Google Patents

Abstract

The invention discloses an organic positive electrode material, a preparation method and application thereof in an alkali metal ion battery, wherein the structural formula of the organic positive electrode material is as follows:

the organic electrode material provided by the invention has extremely low cost, is a single organic electrode material with electrochemical activity, which can be used in a lithium/sodium/potassium ion battery, and can further reduce the production cost of an alkali metal ion secondary battery.

Description

A kind of organic cathode material, preparation method and application in alkali metal ion battery

technical field

The invention relates to the technical field of batteries, in particular to an organic positive electrode material, a preparation method and an application in an alkali metal ion battery.

Background technique

At present, due to the limited stock of lithium resources in commercial lithium-ion batteries, the high cost of lithium- and cobalt-containing materials in the positive electrode, and the pollution of the environment, it is difficult to carry out large-scale low-cost energy storage applications. There is an urgent need to develop new electrode materials, as well as other secondary battery systems with low cost and excellent performance.

For sodium-ion batteries and potassium-ion batteries, the reserves of sodium and potassium are extremely rich, and they are a new type of secondary battery system with potential.

At present, there are few reports on inorganic positive and negative electrode materials that can be simultaneously applied to lithium/sodium/potassium ion batteries.

Compared with inorganic electrode materials, organic electrode materials can store lithium/sodium/potassium ions more efficiently and stably than inorganic materials due to their more empty solid lattice. Nevertheless, there are currently few reports on single organic cathode and organic anode materials suitable for Li/Na/K-ion batteries. In addition, the cases of sodium/potassium ion full batteries using a single organic cathode material are even rarer, and the energy density, rate performance and cycle stability of sodium/potassium ion full batteries need to be further improved.

Contents of the invention

Based on the above technical background, the present invention provides an organic positive electrode material, a preparation method and an application in an alkali metal ion battery to solve the above problems. The organic positive electrode material can be used as a single positive electrode material in lithium/sodium/potassium ion batteries at the same time .

The present invention realizes through following technical scheme:

A kind of organic cathode material, structural formula is as follows:

命名为2PTCDA。

Named 2PTCDA.

The cost of the organic electrode material provided by the invention is extremely low, and it is a single, electrochemically active organic electrode material that can be used in lithium/sodium/potassium ion batteries, and can further reduce the production cost of alkali metal ion secondary batteries.

A method for preparing an organic positive electrode material. Under the action of a catalyst, 1,1'-(1,4-phenylene)-bis[perylene-3,4,9,10-tetra(carboxylic hexyl ester)] is used as a raw material through Preparation by heating reaction (optional, preparation by heating ring closure reaction):

Wherein, R represents an alkyl group, preferably -CH ₂ (CH ₂ ) ₄ CH ₃ .

Further preferably, the catalyst is an acid catalyst, preferably the acid catalyst includes toluenesulfonic acid; the reaction solvent includes toluene.

Specifically, 1,1'-(1,4-phenylene)-bis[perylene-3,4,9,10-tetra(carboxylichexyl ester)], p-toluenesulfonic acid and toluene were added to the reactor and mixed; the mixture Heating and reacting to prepare the organic cathode material (2PTCDA), and finally purifying. The heating temperature is such as heating at 100° C. for 30 hours, and then cooling to room temperature.

For purification, the residue was washed several times with methanol and water after the reaction. After this, the dried precipitate was extracted in chloroform (150 mL) using a Soxhlet apparatus to remove soluble anhydride impurities and dried to obtain pure 2PTCDA final product.

Further preferably, the 1,1'-(1,4-phenylene)-bis[perylene-3,4,9,10-tetra(carboxylic hexyl ester)] is prepared by the following method: 6-bromo-perylene-3 ,4,9,10-tetra(carboxylic hexyl ester) and 1,4-phenylene bisboronic acid are prepared by catalytic reaction:

Further preferably, the catalyst used in the catalytic reaction is a palladium catalyst; preferably, the palladium catalyst includes tetrakis(triphenylphosphine)palladium.

Specifically, under an inert gas atmosphere (such as a nitrogen atmosphere), 6-bromo-perylene-3,4,9,10-tetra (carboxylic hexyl ester), 1,4-phenylene bisboronic acid, tetrakis (tri Phenylphosphine) palladium and potassium carbonate are added into the reactor, and then a mixed solvent containing 1,4-dioxane and deionized water is added, and it is prepared by heating and reacting under an inert atmosphere, and it can be further purified. The reaction was heated eg, stirred at 110 °C under _N2 atmosphere for 3 days, cooled to room temperature.

The final purification treatment method such as: extraction with dichloromethane (DCM, 40 mL). The extract was dried over Na ₂ SO ₄ , filtered, and concentrated in vacuo to remove excess solvent (H ₂ O). The crude product was purified by column chromatography (silica gel, petroleum ether/ethyl acetate = 10/1 to 8/1 to 5/1) to give 1,1-(1,4-phenylene)-bis[perylene- 3,4,9,10-tetra(carboxylic hexyl ester)].

Further preferably, the 6-bromo-perylene-3,4,9,10-tetra (carboxylic hexylester) is prepared by the following method: under the action of a catalyst, perylene-3,4,9,10-tetra (carboxylichexyl ester) A bromination reaction occurs to generate 6-bromo-perylene-3,4,9,10-tetra(carboxylic hexylester):

Further preferably, perylene-3,4,9,10-tetra (carboxylic hexyl ester) undergoes bromination reaction with N-bromosuccinimide; the catalyst includes FeCl ₃ .

Specifically, perylene-3,4,9,10-tetra (carboxylic hexyl ester), N-bromosuccinimide and FeCl ₃ were added to the reactor, and then under an inert gas atmosphere (such as N ₂ atmosphere ) was added with acetonitrile and mixed; then the mixture was heated and reacted to obtain it, and further purified. Add reaction conditions such as reacting at 80° C. for 3 days, and cool to room temperature. Purification treatment methods such as: after removing the solvent, purify the mixture by column chromatography (silica gel, petroleum ether/ethyl acetate = 8:1), and then recrystallize from petroleum ether to obtain orange solid 6-bromo-perylene-3,4 ,9,10-tetra (carboxylic hexyl ester).

Further preferably, the perylene-3,4,9,10-tetra (carboxylic hexyl ester) is prepared by the following method: using perylenetetracarboxylic dianhydride as raw material and reacting with 1-bromohexane to obtain:

Specifically, perylenetetracarboxylic dianhydride, 1-hexanol, and 1-bromohexane were charged into the reactor. Then add DMF solution and DBU (an organic base) to the mixture to mix, and then heat the mixture to react to prepare it, and then it can be further purified. The reaction conditions were heated such as stirring the mixture at 80° C. for 3 days and then cooled to room temperature.

The purification treatment method is as follows: pour the reaction solution into a mixed solvent (absolute ethanol: water = 1:20), stir and let stand for 5 hours. After filtration, the solid was redissolved in dichloromethane (DCM) and purified on a silica gel column using petroleum ether (PE) as eluent. After removing the solvent under vacuum, the crude product was recrystallized from ethyl acetate (EA)/petroleum ether to give a pale yellow solid.

An application of an organic positive electrode material, the application of the above organic positive electrode material or the organic positive electrode material prepared by the above method for preparing the organic positive electrode material in an alkali metal ion battery.

Further preferably, the alkali metal ions include lithium ions, sodium ions or potassium ions, that is, the organic positive electrode material provided by the present invention can be used in lithium ion batteries, potassium ion batteries and sodium ion batteries at the same time.

A positive electrode sheet, the positive electrode material includes an organic positive electrode material, and the structural formula of the organic positive electrode material is as follows:

The organic positive electrode material provided by the invention can be used as the single organic positive electrode material of the alkali metal ion battery. Further preferably, the raw material composition of the prepared positive electrode sheet includes 60%-80wt% organic positive electrode material 2PTCDA, 10%-30wt% conductive carbon additive and 10wt% binder.

When preparing the positive electrode sheet, all the raw materials of the positive electrode sheet can be mixed and evenly coated on the aluminum foil, and the load mass of 2PTCDA on the electrode sheet is greater than 2mg cm ^-2 . Pressed into a round aluminum electrode sheet; this electrode sheet is used in alkali metal ion half cells and full cells.

An alkali metal ion battery, the positive electrode material includes the above-mentioned organic positive electrode material, or the organic positive electrode material prepared by the above-mentioned method for preparing the organic positive electrode material; or the electrode sheet includes the above-mentioned positive electrode sheet.

The present invention has following advantage and beneficial effect:

The invention obtains a high-performance and universal organic cathode material (2PTCDA) for lithium/sodium/potassium ion batteries through the design and synthesis of organic molecules. The application of 2PTCDA as a single cathode material in lithium/sodium/potassium ion half-cells and sodium/potassium-ion full batteries has achieved excellent battery performance.

Description of drawings

The drawings described here are used to provide a further understanding of the embodiments of the present invention, constitute a part of the application, and do not limit the embodiments of the present invention. In the attached picture:

Fig. 1 is the hydrogen NMR spectrum ( ¹ H-NMR spectrum) of 2PTCDA.

Figure 2 is an organic synthesis route map of 2PTCDA.

Figure 3 is the electrochemical performance of 2PTCDA in lithium (Li) ion half-cells; where (a) represents the charge and discharge voltage curves of lithium (Li) ion half-cells, (b) represents lithium (Li) ion half-cells in small The cycle test graph under current conditions, (c) shows the rate performance graph of the lithium (Li) ion half-cell, and (d) shows the high-current long-cycle test graph of the lithium (Li) ion half-cell.

Figure 4 is the electrochemical performance of 2PTCDA in sodium (Na) ion half-cells; where (a) represents the charge and discharge voltage curves of sodium (Na) ion half-cells, and (b) represents the cycle of sodium (Na) ion half-cells test chart.

Figure 5 is the electrochemical performance of 2PTCDA in sodium (Na) ion full battery; where (a) represents the charge and discharge voltage curve of sodium (Na) ion full battery, (b) represents the cycle of sodium (Na) ion full battery test chart.

Fig. 6 is a charge-discharge curve diagram of 2PTCDA in six different electrolytes of a potassium (K) ion half-cell.

Figure 7 is the electrochemical performance of 2PTCDA in a potassium (K) ion half-cell; where (a) represents the cycle test diagram of the potassium (K) ion half-cell under low current conditions, and (b) represents the potassium (K) ion half-cell The rate performance diagram of the battery, (c) shows the high current long cycle test diagram of the potassium (K) ion half-cell.

Figure 8 is the electrochemical performance of 2PTCDA in a potassium (K) ion full battery; wherein (a) represents the charge and discharge voltage curve of a potassium (K) ion full battery, and (b) represents a potassium (K) ion full battery at a small The cycle test graph under current conditions, (c) shows the rate performance graph of the potassium (K) ion full battery, and (d) shows the high current long cycle test graph of the potassium (K) ion full battery.

Detailed ways

In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the examples and accompanying drawings. As a limitation of the present invention.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. It will be apparent, however, to one of ordinary skill in the art that these specific details need not be employed to practice the present invention. In other instances, well-known structures, circuits, materials, or methods have not been described in detail in order to avoid obscuring the present invention.

Throughout this specification, reference to "one embodiment," "an embodiment," "an example," or "example" means that a particular feature, structure, or characteristic described in connection with the embodiment or example is included in the present invention. In at least one embodiment. Thus, appearances of the phrases "one embodiment," "an embodiment," "an example," or "example" in various places throughout this specification are not necessarily all referring to the same embodiment or example. Furthermore, particular features, structures or characteristics may be combined in any suitable combination and/or subcombination in one or more embodiments or examples. Furthermore, those of ordinary skill in the art will appreciate that the drawings provided herein are for illustrative purposes and are not necessarily drawn to scale. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Example 1

This embodiment provides an organic positive electrode material named 2PTCDA, and its structural formula is as follows:

The preparation method of organic cathode material 2PTCDA is as follows:

Step 1: Perylenetetracarboxylic dianhydride PTCDA (1.00 g, 2.55 mmol), 1-hexanol (0.61 g, 6 mmol) and 1-bromohexane (1.24 g, 7.5 mmol) were added to a 250 mL Schlenk flask. Then 40 mL of N,N-dimethylformamide (DMF) and 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU; 1.52 g, 10 mmol) were added to the mixture. The mixture was stirred at 80 °C for 3 days, then cooled to room temperature. The reaction solution was poured into a mixed solvent (absolute ethanol: water = 1:20), stirred and left to stand for 5 hours. After filtration, the solid was redissolved in dichloromethane (DCM) and purified on a silica gel column using petroleum ether (PE) as eluent. After removing the solvent under vacuum, the crude product was recrystallized from ethyl acetate (EA)/petroleum ether to give perylene-3,4,9,10-tetra(carboxylic hexyl ester) (named compound 1) (1.55 g, 2.03 mmol, 80%).

Step 2: Compound 1 (1.00g, 1.3mmol), N-bromosuccinimide (NBS; 0.3g, 1.69mmol) and FeCl ( _32.4mg , 0.2mmol) were added to a 250mL Schlenk flask, and then 40 mL of acetonitrile (MeCN) was added under _N2 atmosphere. The mixture was reacted at 80°C for 3 days and then cooled to room temperature. After removal of the solvent, the mixture was purified by column chromatography (silica gel, petroleum ether/ethyl acetate = 8:1), followed by recrystallization from petroleum ether to give 6-bromo-perylene-3,4,9,10- tetra (carboxylic hexyl ester) (named compound 2) (0.87 g, 1.03 mmol, 80%).

Step 3: Under nitrogen atmosphere, compound 2 (1g, 1.18mmol), 1,4-phenylene bisboronic acid (0.096g, 0.58mmol), tetrakis (triphenylphosphine) palladium (Pd (PPh3) 4, 5 mg, 0.004 mmol) and potassium carbonate (K ₂ CO ₃ , 2.764 g, 0.02 mol) were added to a 250 ml schlenk flask, followed by a mixed solvent containing 1,4-dioxane (40 mL) and deionized water (10 mL) , and stirred at 110 °C under _N2 atmosphere for 3 days. The mixture was cooled to room temperature and extracted with dichloromethane (DCM, 40 mL). The extract was dried over Na ₂ SO ₄ , filtered, and concentrated in vacuo to remove excess solvent (H ₂ O). The crude product was purified by column chromatography (silica gel, petroleum ether/ethyl acetate = 10/1 to 8/1 to 5/1) to give 1,1'-(1,4-phenylene)-bis[perylene -3,4,9,10-tetra(carboxylic hexyl ester)] (designated as compound 3) (0.74 g, 0.913 mmol, 78%).

Step 4: Compound 3 (1 g, 0.62 mmol), p-toluenesulfonic acid (p-TsOH, 1.178 g, 6.2 mmol) and 40 mL of toluene (dried over sodium under argon atmosphere) were added to a 250 mL double necked tube. The mixture was heated at 100°C for 30 hours. After cooling to room temperature, the reaction mixture was filtered, and the residue was washed several times with methanol and water. After this, the dried precipitate was extracted in chloroform (150 mL) using a Soxhlet apparatus to remove soluble anhydrides, and dried to obtain pure 2PTCDA final product (0.48 g, 0.56 mmol, 90%). The H NMR spectrum of the prepared organic cathode material 2PTCDA is shown in Fig. 1 .

The synthetic route of the organic cathode material 2PTCDA is shown in Figure 2.

Example 2

This embodiment provides a positive electrode sheet, 2PTCDA electrode sheet, the specific preparation method is as follows:

2PTCDA (65wt%) prepared in Example 1, conductive carbon additive (25wt%), and binder (10wt%) were mixed; then evenly coated on the aluminum foil; the loading mass of 2PTCDA on the electrode sheet was greater than 2mg cm ^-2 . Press into a circular aluminum electrode sheet; apply this electrode sheet to alkali metal ion half-cells and full cells; test its redox potential, actual specific capacity, cycle stability and rate performance. The performance of subsequent alkali metal ion batteries proves that 2PTCDA is a new type of organic small molecule cathode material with high capacity, high rate performance, high voltage and high stability in alkali metal ion batteries.

Example 3

About the performance test of 2PTCDA in lithium ion battery

This embodiment provides a half battery: use the 2PTCDA electrode sheet prepared in Example 2 as the positive electrode, metal lithium as the negative electrode, and 6M LiTFSI+DME/DOL as the electrolyte.

The performance test results are shown in Figure 3. Specifically as shown in Figure 3:

It can be seen from figure (a) that when the working voltage is 1.4-3.6V, the redox voltage of 2PTCDA is 2.35V (vs. Li ⁺ /Li), and the peak specific capacity can reach 142mAh g ^-1 .

It can be seen from Figure (b) that after 200 cycles at a current density of 62.5mA g ^-1 (0.5C), the capacity retention rate is 83% (124～102mAh g ^-1 );

It can be seen from figure (d) that under the high current (1000mA g ^-1 ) cycle, 66% specific capacity (110～73mAh g ^-1 ) can still be maintained after 3000 cycles.

It can be seen from Figure (c) that 2PTCDA also has excellent rate performance in lithium-ion batteries: at current densities of 100/200/500/1000/2000/3000/4000/5000mA g ^-1 , the specific capacities are respectively 132/126/122/115/113/112/110/107mAh g ^-1 .

Example 4

About the performance test of 2PTCDA in sodium-ion battery

(1) This example provides a half-cell: the 2PTCDA electrode sheet prepared in Example 2 is used as the positive electrode, metal sodium is used as the negative electrode, and 4M NaPF ₆ +DME is used as the electrolyte.

The performance test results are shown in Figure 4. Specifically as shown in Figure 4:

It can be seen from figure (a) that the oxidation-reduction potential of 2PTCDA in the sodium-ion half-cell is about 2.3V (vs. Na ⁺ /Na), and the specific capacity is about 130mAhg ^-1 .

It can be seen from Figure (b) that at a small current of 0.5C (62.5mA g ^-1 ), it can cycle stably for 95 cycles and retain 125mAh g ^-1 , the maximum discharge specific capacity can reach 131mAh g ^-1 , and the capacity retention rate is 95. %.

(2) This embodiment provides a full battery: use the 2PTCDA electrode sheet prepared in Example 2 as the positive electrode, use the sodium bismuth alloy Na3Bi electrode sheet as the negative electrode, and use 4M NaPF ₆ in DME as the electrolyte to assemble the full battery. The conductive carbon of the Na ₃ Bi electrode is Super-P, and the preparation process of the rest of the electrode sheets is consistent with the preparation process of the 2PTCDA electrode sheets.

The performance test results are shown in Figure 5. Specifically as shown in Figure 5:

It can be seen from the figure (a) that the platform voltage of the all-electric is about 1.7V, and the specific capacity is about 125mAh g ^-1 .

It can be seen from Figure (b) that at a small current of 100mA g ^-1 , after a long cycle of 100 cycles, the discharge specific capacity can be stabilized at about 120mAh g ^-1 , and the capacity retention rate is about 94%.

Example 5

About the Performance Test of 2PTCDA in Potassium-ion Batteries

(1) This example provides a half-battery: use the 2PTCDA electrode sheet prepared in Example 2 as the positive electrode, metal potassium as the negative electrode, and 6 kinds of electrolytes (1M KFSI in EC/DEC/DMC, 1M KFSI in DME, 1M KTFSI in EC/DEC/DMC, 1M KTFSI in DME, 0.8M KPF ₆ in EC/DEC and 1M KPF ₆ in DME).

Performance test results are shown in Figures 6 and 7. Specifically as shown in Figure 6:

It can be seen from Figure (6) that 2PTCDA has excellent electrochemical activity in all six electrolytes. Its redox voltage is between 2-3V (vs. K+/K), and its specific capacity is 120-140mAhg ^-1 .

When the electrolyte is 1M KFSI in EC/DEC/DMC, and the working voltage is 1.5-3.6V, 2PTCDA also has excellent cycle stability in potassium-ion half-cells, as shown in Figure 7:

It can be seen from Figure (a) that after 200 cycles at a current density of 62.5mA g ^-1 (0.5C), the capacity retention rate is 85% (136～115mAh g ^-1 );

It can be seen from figure (c) that under the high current (1000mA g ^-1 ) cycle, 49% of the specific capacity (136～66mAh g ^-1 ) can still be maintained after 2500 cycles.

It can be seen from Figure (b) that at the same time, potassium ion half-cells also have excellent rate performance: at current densities of 100/200/500/1000/2000/3000/4000/5000mA g ^-1 , they have specific capacities of 136/132/128/125/123/119/113/105mAh g ^-1 .

(2) This embodiment provides a full battery: use the 2PTCDA electrode sheet prepared in Example 2 as the positive electrode, use the K ₄ TP electrode sheet as the negative electrode, and use 1M KPF ₆ in DME as the electrolyte to assemble the full battery. The preparation process of K ₄ TP electrode sheet is consistent with that of 2PTCDA electrode sheet.

The performance test results are shown in Figure 8. Specifically as shown in Figure 8:

It can be seen from Figure (a) that under the working voltage of 0.8-3.0V, the full battery can reach the peak capacity of the positive electrode of 130mAh g ^-1 , and the median voltage is about 1.76V. Therefore, based on the calculation of the positive electrode material, the full battery can achieve an energy density of 229Whkg ^-1 (130mAh g ^-1 ×V _average =1.76V).

It can be seen from the figure (b) that under the low current (100mA g ^-1 ) cycle, 80% of the specific capacity (130～104mAh g ^-1 ) can still be maintained after 100 cycles;

It can be seen from figure (d) that under the high current (1000mA g ^-1 ) cycle, 54% specific capacity (133～72mAh g ^-1 ) can still be maintained after 2500 cycles.

It can be seen from Figure (c) that at the same time, the full battery also has excellent rate performance: for the positive electrode material, at the current density of 100/200/500/1000/2000mA g ^-1 , it has 122/113/112/107 /101mAh g ^-1 specific capacity, even at a high current density of 3A g ^-1 can still reach 99mAh g ^-1 specific capacity.

The specific embodiments described above have further described the purpose, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above descriptions are only specific embodiments of the present invention and are not intended to limit the scope of the present invention. Protection scope, within the spirit and principles of the present invention, any modification, equivalent replacement, improvement, etc., shall be included in the protection scope of the present invention.

Claims (12)

1. An organic positive electrode material is characterized by having the following structural formula:

2. the preparation method of the organic positive electrode material is characterized in that under the action of a catalyst, 1' - (1, 4-phenyl) -bis [ perylene-3,4,9,10-tetra (carboxylic hexyl ester) ] is used as a raw material to prepare the organic positive electrode material through heating reaction:

wherein R represents an alkyl group.

3. The method for producing an organic positive electrode material according to claim 2, wherein the catalyst is an acid catalyst comprising toluene sulfonic acid; the solvent for the reaction includes toluene; r is-CH ₂ (CH ₂ ) ₄ CH ₃ 。

4. The method for preparing an organic positive electrode material according to claim 2, wherein the 1,1' - (1, 4-phenyl) -bis [ perylene-3,4,9,10-tetra (carboxylic hexyl ester) ] is prepared by the following method: the 6-bromo-perbylene-3, 4,9,10-tetra (carboxylic hexyl ester) and 1,4-phenylene bisboric acid are prepared by catalytic reaction:

5. the method for preparing an organic positive electrode material according to claim 4, wherein the catalyst used in the catalytic reaction is a palladium catalyst; the palladium catalyst comprises tetrakis (triphenylphosphine) palladium.

6. The method for preparing an organic positive electrode material according to claim 4, wherein the 6-bromo-permene-3, 4,9,10-tetra (carboxylic hexyl ester) is prepared by: bromination reaction is carried out on the perine-3, 4,9,10-tetra (carboxylic hexyl ester) under the action of a catalyst to generate 6-bromo-perine-3, 4,9,10-tetra (carboxylic hexyl ester):

7. the method for preparing an organic positive electrode material according to claim 6, wherein the bromination reaction of the perylene-3,4,9,10-tetra (carboxylic hexyl ester) with the N-bromosuccinimide is carried out; the catalyst comprises FeCl ₃ 。

8. The method for preparing an organic positive electrode material according to claim 6, wherein the permene-3, 4,9,10-tetra (carboxylic hexyl ester) is prepared by the following method: taking perylene tetracarboxylic dianhydride as a raw material, and reacting with 1-bromohexane to prepare the perylene tetracarboxylic dianhydride:

9. the application of the organic positive electrode material is characterized in that the organic positive electrode material disclosed in claim 1 or the organic positive electrode material prepared by the preparation method of the organic positive electrode material disclosed in any one of claims 2-8 is applied to an alkali metal ion battery.

10. The use of an organic positive electrode material according to claim 9, wherein the alkali metal ions comprise lithium, sodium or potassium ions.

11. The positive plate is characterized in that the positive plate comprises an organic positive material, and the structural formula of the organic positive material is as follows:

12. an alkali metal ion battery, characterized in that the positive electrode material comprises the organic positive electrode material according to claim 1, or the organic positive electrode material prepared by the preparation method of the organic positive electrode material according to any one of claims 2 to 8; or the electrode sheet includes the positive electrode sheet of claim 11.

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