Organic monocyclic macromolecular compound electrode material, preparation method and application of organic monocyclic macromolecular compound electrode material in lithium ion battery

Abstract

The invention discloses an organic monocyclic macromolecular compound electrode material, a preparation method and application of the organic monocyclic macromolecular compound electrode material in a lithium ion battery. The organic monocyclic macromolecular compound electrode material is a monocyclic polybenzoquinone derivative which is obtained by carrying out dehydration condensation reaction on tetraaminobenzoquinone and disodium rose acid. The organic monocyclic macromolecular compound has a relatively large conjugated system and a relatively large aperture structure, is beneficial to full exposure of active sites and rapid transmission of ions, and remarkably inhibits the dissolution behavior of a material in an organic electrolyte, so that the cycling stability and the rate capability of a battery are remarkably improved. The molecular structure of the material contains a plurality of redox active sites (C = O and C = N), and can be reversibly coordinated with lithium ions to realize efficient lithium storage. The organic monocyclic molecular compound electrode material has high capacity, high stability and excellent rate capability, shows excellent electrochemical performance in a lithium ion battery system, and has high energy density and long service life.

Description

Technical Field

[0001] This invention relates to the field of lithium-ion battery cathode materials technology, and more specifically, to an organic monocyclic macromolecular compound electrode material, its preparation method, and its application in lithium-ion batteries. Background Technology

[0002] Currently, the specific capacity of commonly used inorganic cathode materials in commercially available lithium-ion battery systems is generally 100–200 mAh g. -1 The specific capacity of graphite anodes can reach approximately 400 mAh g. -1 The energy density of these materials is difficult to further improve. Compared to traditional inorganic electrode materials, organic molecules have advantages such as renewable resources, environmental friendliness, and highly designable structures, making them ideal candidate materials for developing low-cost, efficient, and sustainable energy storage systems. Among them, small organic molecules have received widespread attention in recent years due to their abundant active sites and strong structural tunability, which can maximize the utilization of exposed lithium storage sites and redox active centers. However, the high solubility of small organic molecules in organic electrolytes leads to the loss of active materials, thus seriously affecting cycle stability. To address this, researchers have proposed using covalent organic frameworks (COFs) to construct rigid porous frameworks through strong covalent bonds, thereby improving the chemical stability of the materials and inhibiting dissolution. However, the framework of such materials usually contains non-redox active connecting units, resulting in limited theoretical capacity. Although some studies have attempted to improve energy storage performance by introducing high-density redox groups, their active sites are often buried inside the dense framework, limiting ion transport and resulting in low utilization of active sites, making it difficult to achieve the expected actual capacity.

[0003] Therefore, how to strike a balance between inhibiting dissolution and maintaining high utilization of active sites to achieve organic cathode materials with both high capacity and long lifespan remains a key scientific and technological challenge in this field. Summary of the Invention

[0004] The purpose of this invention is to address the problems of high solubility, low utilization of active sites, and limited capacity in existing organic electrode materials by providing an organic monocyclic macromolecular compound electrode material with a stable structure and high specific capacity, and to propose its preparation method and application in lithium-ion batteries. To achieve the above objective, this invention provides an organic monocyclic macromolecular compound electrode material, which is a monocyclic polybenzoquinone derivative (HPBQ). This monocyclic macromolecular structure possesses abundant active lithium storage sites and exhibits a large inner ring diameter of 14.6 Å, which not only facilitates the full exposure of active sites and rapid ion transport but also contributes to achieving high theoretical and actual specific capacities. This compound is prepared by a dehydration condensation reaction of tetraaminobenzoquinone (TABQ) and disodium roserate (Na₂C₆O₆). By introducing a conjugated macrocyclic system and multiple redox active sites (C=O and C=N) into the molecular structure, its extended π-conjugated system enhances structural stability and effectively inhibits dissolution, thus achieving reversible ion storage and stable cycling during charge and discharge, exhibiting excellent electrochemical performance.

[0005] To achieve the above objectives, the present invention provides an organic monocyclic macromolecular compound electrode material, wherein the organic monocyclic macromolecular compound electrode material is a monocyclic polybenzoquinone derivative and has the following structural formula: .

[0006] The present invention also provides a method for preparing the above-mentioned organic monocyclic macromolecular compound electrode material, wherein the organic monocyclic macromolecular compound electrode material is obtained by dehydration condensation reaction of tetraaminobenzoquinone (TABQ) and disodium roserate (Na2C6O6).

[0007] Furthermore, the preparation method includes the following steps: Step 1: Under an inert atmosphere, add tetraaminobenzoquinone and disodium roserate to a mixed solvent of acetic acid and deionized water, heat and stir to react; Step 2: After the reaction is complete, the product is washed, filtered and dried to obtain the organic monocyclic macromolecular compound electrode material.

[0008] Furthermore, in step 1, the molar ratio of tetraaminobenzoquinone to disodium roserate is 1~1.2:1.

[0009] Furthermore, in step 1, the conditions for heating and stirring the reaction are as follows: first stir at room temperature for 30–60 min, then heat to 115–120 °C and reflux for 24–48 h.

[0010] Furthermore, in step 1, the inert atmosphere is nitrogen or argon.

[0011] Furthermore, in step 2, the washing process involves sequentially washing with water, ethanol, methanol, and toluene 3 to 6 times.

[0012] This invention also provides an application of the above-described organic monocyclic macromolecular compound electrode material in lithium-ion battery cathode materials.

[0013] Furthermore, the organic monocyclic macromolecular compound electrode material, conductive carbon material, and binder are mixed and ground into a slurry in an organic solvent, coated onto an aluminum foil current collector, and vacuum dried at 60–80 °C for 12–24 h to obtain a positive electrode sheet; using lithium metal as the negative electrode, employing a Celgard diaphragm, adding electrolyte, and assembling into a coin cell in an argon-filled glove box.

[0014] Furthermore, the conductive carbon material is a conductive paste, the binder is polyvinylidene fluoride, and the electrolyte is a 1-2 M lithium bis(trifluoromethanesulfonyl)imide solution, with the solvent being a mixed solution of ethylene glycol dimethyl ether and 1,3-dioxolane in a volume ratio of 1:1-3.

[0015] The organic monocyclic macromolecular compound provided by this invention possesses the following electrochemical properties: First, high stability: the extended π-conjugated system enhances structural stability and effectively inhibits dissolution, thus improving cycle life. Second, ultra-high theoretical and actual specific capacity: the high-density integration of electroactive groups, the monocyclic structure ensures complete accessibility of active sites, and the appropriate pore size promotes ion diffusion, effectively improving both theoretical and actual specific capacity. The organic monocyclic macromolecular compound HPBQ provided by this invention has advantages such as structural stability, abundant active sites, and strong solubility inertness. When applied to the cathode of lithium-ion batteries, it can significantly improve specific capacity and cycle life. The synthetic route of this invention is simple and the conditions are mild, exhibiting good scalability and industrialization potential.

[0016] Compared with existing technologies, the present invention has the following beneficial effects: 1. This invention designs a monocyclic polybenzoquinone derivative with a monocyclic conjugated backbone. The electroactive groups are integrated in a single macrocyclic molecular system with a high density, forming a rigid and chemically stable conjugated planar structure. This effectively improves its solubility and inertness in organic electrolytes, significantly reduces the dissolution of active components in electrolytes, and ensures that the electrode structure remains intact during long-term charge-discharge cycles, thereby greatly improving cycle stability.

[0017] 2. The organic monocyclic macromolecular compound electrode material designed in this invention possesses densely packed electroactive groups (C=O, C=N), endowing it with a high theoretical specific capacity. Furthermore, the hydroxyl groups in the designed organic monocyclic macromolecular compound electrode material transform into electrochemically active carbon-based structures during the initial cycling process, further increasing the redox active sites and charge storage capacity, thereby achieving 817 mAh g⁻¹. 1 Its extremely high theoretical capacity.

[0018] 3. The organic monocyclic macromolecular compound electrode material designed in this invention possesses a continuous π-conjugated system, which is beneficial for efficient electron conduction within the framework and provides appropriate pores to promote rapid lithium-ion diffusion, achieving stable capacity output even at high rates. Simultaneously, this structure effectively overcomes the defects of traditional covalent organic frameworks (COFs) such as "buried active sites and restricted ion diffusion," achieving a capacity output of 0.05 A g. 1 Achieved 806 mAh g 1 Extremely high actual specific capacity.

[0019] 4. The organic monocyclic macromolecular compound electrode material designed in this invention is prepared through a simple condensation reaction. The preparation method is simple, efficient, and yields high products. The raw materials used are green and inexpensive. When used as a cathode material in lithium-ion batteries, it exhibits extremely high capacity, cycle stability, and rate performance, achieving a balance between structural stability and energy storage performance in organic electrode materials. This provides a new design concept and technical approach for developing high-capacity, long-life organic electrode materials. Lithium-ion batteries made using the organic monocyclic macromolecular compound electrode material obtained in this invention achieve a rate performance of 0.05 A g. 1 806 mAh g was achieved under the current conditions. 1 The high actual theoretical specific capacity and active site utilization rate of up to 99% demonstrate complete accessibility of the active sites. Notably, at 0.1 A g... 1 Under the given current conditions, 756 mAh g was achieved. 1 After 100 cycles, it still retains 80% of its peak capacity, mainly due to its rigid π-conjugated hexagonal macrocyclic framework effectively reducing its solubility and exhibiting good cycling stability; in addition, at 5 A g 1 At a current density of 305 mAh g, the battery capacity is 305 mAh g. 1It exhibits excellent rate performance. The organic monocyclic macromolecular compound electrode material obtained in this invention, as a positive electrode material for lithium-ion batteries, demonstrates extremely high capacity density, stable cycle life, and excellent rate performance.

[0020] In addition to the objectives, features, and advantages described above, the present invention has other objectives, features, and advantages. The invention will now be described in further detail with reference to the figures. Attached Figure Description

[0021] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings: Figure 1 This is a schematic diagram of the synthesis route of the organic monocyclic macromolecular compound electrode material obtained in Embodiment 1 of the present invention; Figure 2 The Fourier transform infrared spectrum of the organic monocyclic macromolecular compound electrode material obtained in Embodiment 1 of this invention; Figure 3 The image shows the Raman spectrum of the organic monocyclic macromolecular compound electrode material obtained in Example 1 of this invention. Figure 4 The solid-state carbon NMR spectrum of the organic monocyclic macromolecular compound electrode material obtained in Example 1 of this invention; Figure 5 This is a liquid chromatography-high resolution mass spectrum of the organic monocyclic macromolecular compound electrode material obtained in Embodiment 1 of the present invention; Figure 6 This is a scanning image of the organic monocyclic macromolecular compound electrode material obtained in Example 1 of this invention; Figure 7 Thermogravimetric analysis diagram of the organic monocyclic macromolecular compound electrode material obtained in Embodiment 1 of this invention; Figure 8 The nitrogen adsorption-desorption test and pore size distribution diagram of the organic monocyclic macromolecular compound electrode material obtained in Embodiment 1 of this invention are shown. Figure 9 To test the lithium-ion battery using the organic monocyclic macromolecular compound electrode material obtained in Example 1 of this invention at 0.05 A g 1 Differential capacity curves (dQ / dV) of lithium-ion batteries at current density; where a, b, and c correspond to the values ​​at 0.1 A g. 1 Differential capacity curves (dQ / dV) of lithium-ion batteries under current density conditions for the first, second, and third cycles. Figure 10To test the lithium-ion battery using the organic monocyclic macromolecular compound electrode material obtained in Example 1 of this invention at 0.05 A g 1 Charge-discharge curves of lithium-ion batteries with current density; Figure 11 To test the lithium-ion battery using the organic monocyclic macromolecular compound electrode material obtained in Example 1 of this invention at 0.1 A g 1 Cycle performance of lithium-ion batteries at current density; Figure 12 The graph shows the rate performance of lithium-ion batteries made using the organic monocyclic macromolecular compound electrode material obtained in Example 1 of this invention at different current densities. Detailed Implementation

[0022] The following is a detailed description of the implementation examples of the present invention. These implementation examples are carried out based on the technical solution of the present invention, and provide detailed implementation methods and specific operation processes. However, the scope of protection of the present invention is not limited to the following implementation examples.

[0023] Unless otherwise specified, the experimental methods used in the following implementation cases are conventional methods. Unless otherwise specified, all reagents and materials used in the following implementation cases are commercially available. The battery performance testing in the following implementation cases utilizes the Blue Battery Testing System and the Ademow Electrochemical Workstation.

[0024] Implementation Case 1 A method for preparing an organic monocyclic macromolecular compound electrode material includes the following steps: Step 1: Under nitrogen protection, tetraaminobenzoquinone (TABQ, 84.08 mg, 0.5 mmol) and disodium roserate (Na₂C₆O₆, 107.02 mg, 0.5 mmol) were added to a mixed solvent of acetic acid (70 mL) and deionized water (30 mL). After the reaction system was subjected to three cycles of vacuum-argon purging, it was first stirred at room temperature for 30–60 min, and then the reaction was continued under reflux at 115–120 °C for 24–48 h.

[0025] Step 2: After the reaction is complete, cool to room temperature, collect the solid product by filtration, and wash thoroughly with deionized water, ethanol, methanol and toluene in sequence. After vacuum drying, obtain the solid product.

[0026] Implementation Case 2 A method for preparing an organic monocyclic macromolecular compound electrode material includes the following steps: Step 1: Under nitrogen protection, tetraaminobenzoquinone (TABQ, 92.49 mg, 0.55 mmol) and disodium roserate (Na₂C₆O₆, 107.02 mg, 0.5 mmol) were added to a mixed solvent of acetic acid (70 mL) and deionized water (30 mL). After the reaction system was subjected to three cycles of vacuum-argon purging, it was first stirred at room temperature for 30–60 min, and then the reaction was continued under reflux at 115–120 °C for 24–48 h.

[0027] Step 2: After the reaction is complete, cool to room temperature, collect the solid product by filtration, and wash thoroughly with deionized water, ethanol, methanol and toluene in sequence. After vacuum drying, obtain the solid product.

[0028] Implementation Case 3 A method for preparing an organic monocyclic macromolecular compound electrode material includes the following steps: Step 1: Under nitrogen protection, tetraaminobenzoquinone (TABQ, 100.90 mg, 0.6 mmol) and disodium roserate (Na₂C₆O₆, 107.02 mg, 0.5 mmol) were added to a mixed solvent of acetic acid (70 mL) and deionized water (30 mL). After the reaction system was subjected to three cycles of vacuum-argon purging, it was first stirred at room temperature for 30–60 min, and then the reaction was continued under reflux at 115–120 °C for 24–48 h.

[0029] Step 2: After the reaction is complete, cool to room temperature, collect the solid product by filtration, and wash thoroughly with deionized water, ethanol, methanol and toluene in sequence. After vacuum drying, obtain the solid product.

[0030] Figure 1 This is a schematic diagram of the synthetic route for the organic monocyclic macromolecular compound electrode material obtained in Embodiment 1 of the present invention. The product is prepared via simple dehydration condensation, resulting in a simple preparation method with high yield and using green and inexpensive raw materials.

[0031] Figure 2 This is the Fourier transform infrared spectrum of the organic monocyclic macromolecular compound electrode material obtained in Embodiment 1 of the present invention. Figure 2 From this, we can know that at 3442 cm 1 1619 cm - ¹、1555 cm 1 1308 cm 1 and 1093 cm 1 Absorption peaks are displayed at these locations, corresponding to OH, C=O, C=N, and C, respectively. N and C The vibrational signal of the O bond indicates the synthesis of this compound.

[0032] Figure 3 This is the Raman spectrum of the organic monocyclic macromolecular compound electrode material obtained in Embodiment 1 of the present invention. Figure 3 From this, we can know that at 3352 cm 1 1570 cm 1 1388 cm 1 And 1628 cm 1 A distinct Raman signal was observed at O, corresponding to O H, C=N, C The vibrations of N and C=O indicate the synthesis of this compound.

[0033] Figure 4 This is the solid-state carbon NMR spectrum of the organic monocyclic macromolecular compound electrode material obtained in Embodiment 1 of the present invention. From... Figure 4 As can be seen from the carbon spectrum, six different chemical environments of carbon were observed: 174, 169, 146, 144, 131, and 129 ppm. The positions of these characteristic peaks are highly consistent with the carbon framework structure of HPBQ.

[0034] Figure 5 This is a liquid chromatography-high resolution mass spectrum of the organic monocyclic macromolecular compound electrode material obtained in Embodiment 1 of the present invention. Figure 5 As can be seen from this, an ion peak ([M–H]) was detected at m / z = 1597.0787. + This value matches exactly with the calculated molecular weight of HPBQ (M = 1596.0529).

[0035] Figure 6 This is a scanning electron microscope image of the organic monocyclic macromolecular compound electrode material obtained in Embodiment 1 of the present invention. From... Figure 6 As can be seen, the organic monocyclic macromolecular compound electrode material is a nanoparticle / rod. This morphology has a rough surface and a relatively large specific surface area, which is beneficial to the utilization of HPBQ electrochemical sites.

[0036] Figure 7This is a thermogravimetric analysis (TGA) chart of the organic monocyclic macromolecular compound electrode material obtained in Embodiment 1 of the present invention. To analyze the thermal stability of the organic monocyclic macromolecular compound electrode material, TGA was performed in an argon atmosphere. The test temperature range was 25–800 °C, and the heating rate was 10 °C / min. The results show that the organic monocyclic macromolecular compound electrode material loses 4.9% of its weight at 91 °C, mainly due to the intramolecular water of crystallization. Furthermore, the material exhibits excellent thermal stability below 359 °C, which is beneficial for the manufacture and operation of lithium-ion batteries under various environments.

[0037] Figure 8 The nitrogen adsorption-desorption test and pore size distribution diagram of the organic monocyclic macromolecular compound electrode material obtained in Embodiment 1 of this invention show that the adsorption isotherm of the organic monocyclic macromolecular compound electrode material rises sharply in the relative pressure region (P / P0 = 0–0.01), exhibiting typical Type I isotherm characteristics, which is a hallmark of microporous materials. Its specific surface area was measured to be 70.56 m². 2 g 1 Pore ​​size distribution analysis showed that its main pore size was 1.24 nm, which is beneficial for the exposure and utilization of active sites and the diffusion of ions.

[0038] Table 1 shows the elemental analysis (EA) results of the organic monocyclic macromolecular compound electrode material obtained in Example 1 of this invention. The EA results confirm that its stoichiometric composition is consistent with the theoretical molecular formula.

[0039] Table 1

[0040] The organic monocyclic macromolecular compound electrode materials prepared in Examples 2 and 3 have similar physicochemical properties to those prepared in Example 1, and will not be described further here.

[0041] Application Implementation Cases The organic monocyclic macromolecular compound electrode material, conductive slurry, and PVDF obtained in Implementation Case 1 were stirred evenly in a shaker at a mass ratio of 6:3:1 to form a well-dispersed slurry. This slurry was then uniformly coated onto an aluminum foil current collector and vacuum dried at 60-80 °C for 12-24 h to form an electrode sheet. This electrode sheet was used as the positive electrode, and a lithium metal sheet as the negative electrode. A PP membrane was used as the separator, and the electrolyte was a 1 M lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) solution (self-prepared) containing ethylene glycol dimethyl ether (DME) and 1,3-dioxolane (DOL) (volume ratio 1:1~1:3). The cells were assembled into a 2032 button cell in an argon-filled glove box, with a test voltage range of 1.0 V-3.9 V vs Li / Li.+ .

[0042] Figure 9 To test the lithium-ion battery using the organic monocyclic macromolecular compound electrode material obtained in Example 1 of this invention at 0.1 A g 1 Differential capacity curve (dQ / dV) of lithium-ion battery at current density. Figure 9 In the equation, a, b, and c correspond to 0.1 Ag. 1 Under the specified current density conditions, the differential capacity curves (dQ / dV) of the lithium-ion battery for the first, second, and third cycles were obtained. The differential capacity curves (dQ / dV) show a significant additional peak at approximately 3.6 V in the first two cycles of the HPBQ battery, which disappears in the third cycle, indicating an irreversible conversion of the ortho-hydroxyl group to an electrochemically active carbonyl structure. Furthermore, through… Figure 9 The results show that HPBQ exhibits four pairs of reversible redox peaks at ~2.6 V / ~3.0 V, ~2.2 V / ~2.7 V, ~2.0 V / ~2.3 V, and ~1.4 V / ~1.6 V, indicating that HPBQ undergoes a multi-stage lithium intercalation process.

[0043] Figure 10 To test the lithium-ion battery using the organic monocyclic macromolecular compound electrode material obtained in Example 1 of this invention at 0.05 A g 1 Charge-discharge curves of lithium-ion batteries at current density. The HPBQ charge-discharge curve results show that at 0.05 Ag... 1 At current density, the HPBQ has an initial discharge specific capacity of 630 mAh g. 1 The capacity contribution primarily comes from the lithiation reaction of the C=O and C=N groups within the HPBQ molecule, involving approximately 36 electron transfers. Its initial charge specific capacity reaches 615 mAh g⁻¹. 1 A new voltage plateau appears around 3.6 V, which should correspond to the irreversible conversion of the ortho-hydroxyl group to form a carbonyl structure. Notably, the second cycle exhibits an enhanced discharge / charge specific capacity of 666 mAh g⁻¹. 1 (Approximately 39 electrons transferred) and 804 mAh g 1 (Approximately 48 electrons transferred), accompanied by a prolonged high-voltage plateau during charging, indicating that the conversion of the hydroxyl group to the carbonyl group is ongoing. By the third cycle, the discharge specific capacity stabilized at 806 mAh g⁻¹. 1 (Approximately 48 electrons transferred). The disappearance of the high-voltage plateau at 3.6 V in the subsequent charging curve confirms that the irreversible transformation process has been completed, and the subsequent cycle stability is determined solely by the reversible 48-electron redox process.

[0044] Figure 11 To test the lithium-ion battery using the organic monocyclic macromolecular compound electrode material obtained in Example 1 of this invention at 0.1 A g 1 Cycle performance of lithium-ion batteries at current density. At 0.1 A g 1 The initial capacity of the organic monocyclic macromolecular compound electrode material obtained in Embodiment 1 of the present invention is 612 mAh g. 1 It reached its peak capacity of 756 mAh g on the third cycle. 1 It is worth noting that after 100 cycles, it still achieved an 80% peak capacity retention rate.

[0045] Figure 12 The diagram shows the rate performance of lithium-ion batteries fabricated using the organic monocyclic macromolecular compound electrode material obtained in Example 1 of this invention at different current densities. 1 It offers 788 mAh g 1 , in 5 A g 1 It offers 305 mAh g 1 Furthermore, when restored to 0.1 Ag 1 At that time, 97% of its initial capacity was recovered, demonstrating the excellent charge transport and structural integrity of HPBQ.

[0046] The electrochemical performance of lithium-ion batteries prepared using the organic monocyclic macromolecular compound electrode materials obtained in Examples 2 and 3 as positive electrode materials is similar to that of lithium-ion batteries prepared using the organic monocyclic macromolecular compound electrode material obtained in Example 1 as positive electrode material, and will not be described again here.

[0047] In summary, this invention discloses an organic monocyclic macromolecular compound electrode material, its preparation method, and its application in lithium-ion batteries. The organic monocyclic macromolecular compound electrode material is a monocyclic polybenzoquinone derivative (HPBQ), obtained by a dehydration condensation reaction of tetraaminobenzoquinone (TABQ) and disodium roserate (Na2C6O6). This organic monocyclic macromolecular compound forms a stable polygonal monocyclic conjugated framework with a large π-conjugated system and a regular pore structure. This not only facilitates the full exposure of active sites and rapid diffusion of lithium ions but also significantly inhibits the dissolution behavior of the material in organic electrolytes, thereby effectively improving cycle stability and rate performance. The molecular structure of this material contains multiple redox active sites (C=O and C=N), which can reversibly coordinate with lithium ions to achieve efficient lithium storage. Furthermore, the hydroxyl groups in the molecule undergo irreversible transformation during the initial electrochemical cycle, generating electrochemically active carbon-based structures that can participate in reactions and possess charge storage capacity, thus exhibiting excellent specific capacity and cycle performance in lithium-ion batteries.

[0048] This invention introduces a monocyclic conjugated macrocyclic structure into the molecular design, ensuring maximum ion accessibility and active site utilization while maintaining molecular stability. This fundamentally overcomes the technical bottlenecks of "severe dissolution" and "limited active sites" in traditional organic cathode materials. The material exhibits high specific capacity, excellent cycle stability, and good rate performance in lithium-ion battery systems, providing a new design approach and technical path for achieving high energy density and long lifespan organic electrode materials.

[0049] Furthermore, the organic monocyclic macromolecular compound electrode material of this invention is prepared by a simple condensation reaction. The product preparation method is simple and efficient with high yield. The raw materials used are green and inexpensive. When applied as a cathode material in lithium-ion batteries, it exhibits extremely high capacity, cycle stability and rate performance. It effectively solves the key scientific and technical problem of inhibiting dissolution and maintaining high utilization of active sites faced by organic cathode materials, and has outstanding electrochemical performance.

[0050] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An organic monocyclic macromolecular compound electrode material, characterized in that, Organic monocyclic macromolecular compound electrode materials are monocyclic polybenzoquinone derivatives, with the following structural formula: 。 2. A method for preparing an organic monocyclic macromolecular compound electrode material as described in claim 1, characterized in that, The organic monocyclic macromolecular compound electrode material is a monocyclic polybenzoquinone derivative, obtained by dehydration condensation reaction of tetraaminobenzoquinone and disodium roserate.

3. The preparation method according to claim 2, characterized in that, Includes the following steps: Step 1: Under an inert atmosphere, add tetraaminobenzoquinone and disodium roserate to a mixed solvent of acetic acid and deionized water, heat and stir to react; Step 2: After the reaction is complete, the product is washed, filtered and dried to obtain the organic monocyclic macromolecular compound electrode material.

4. The preparation method according to claim 3, characterized in that, In step 1, the molar ratio of tetraaminobenzoquinone to disodium roserate is 1~1.2:

1.

5. The preparation method according to claim 3, characterized in that, In step 1, the heating and stirring reaction conditions are as follows: first stir at room temperature for 30–60 min, then heat to 115–120 °C and reflux for 24–48 h.

6. The preparation method according to claim 3, characterized in that, In step 1, the inert atmosphere is nitrogen or argon.

7. The preparation method according to claim 3, characterized in that, The washing steps in step 2 involve washing with water, ethanol, methanol, and toluene 3 to 6 times in sequence.

8. The application of an organic monocyclic macromolecular compound electrode material as described in claim 1 in lithium-ion battery cathode materials.

9. The application according to claim 8, characterized in that, The organic monocyclic macromolecular compound electrode material, conductive carbon material, and binder are mixed and ground into a slurry in an organic solvent, coated onto an aluminum foil current collector, and dried under vacuum at 60–80 °C for 12–24 h to obtain a positive electrode sheet; using lithium metal as the negative electrode, a Celgard diaphragm, and electrolyte, a coin cell is assembled in an argon-filled glove box.

10. The application according to claim 9, characterized in that, The conductive carbon material is a conductive paste, and the binder is polyvinylidene fluoride; the electrolyte is a 1-2 M lithium bis(trifluoromethanesulfonyl)imide solution, and the solvent is a mixed solution of ethylene glycol dimethyl ether and 1,3-dioxolane, with a volume ratio of 1:1-3.

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