Organic carbonyl compound electrode material, preparation method and application thereof in lithium ion battery
By using organic carbonyl compound electrode materials with redox activity and nitrogen-containing heterocyclic extended π-conjugated systems, the solubility and conductivity issues of organic electrode materials have been solved, achieving high-capacity, fast-charge-discharge, and long-life battery performance.
Patent Information
- Application Number
- CN202411327643.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-23
- Publication Date
- 2026-02-06
- Estimated Expiration
- 2044-09-23
AI Technical Summary
The energy density of existing lithium-ion batteries is difficult to improve. The high solubility and low conductivity of organic electrode materials in organic electrolytes limit their cycle life and rate performance. Designing organic electrode materials that combine high capacity, fast charge and discharge and long life remains a challenge.
Organic carbonyl compound electrode materials, such as dipyrido[3′,2′:5,6;2″,3″:7,8]quinoxaline[2,3-i]dipyrido[3,2-a:2′,3′-c]phenazine-10,21-diquinone, are prepared by dehydration condensation reaction using a nitrogen-containing heterocyclic extended π-conjugated system with redox activity. This enhances intermolecular interactions, reduces solubility, and improves electron/ion conduction.
It improves the cycle stability and rate performance of lithium-ion batteries, exhibiting high capacity and excellent electrochemical performance, and significantly enhances the capacity and cycle stability of traditional organic small molecule cathode materials.
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Figure CN119324226B_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of lithium ion battery cathode materials, in particular, relates to an organic carbonyl compound electrode material, a preparation method and application thereof in lithium ion batteries. BACKGROUND
[0002] The battery energy density under the current market lithium ion battery system is difficult to further improve, and the specific capacity of the commonly used inorganic electrode material is generally 100-200 mAh g -1 , while the specific capacity of the graphite negative electrode is as high as 400 mAh g -1 . Compared with traditional inorganic electrode materials, organic molecules have the advantages of renewable resources, environmental friendliness, and highly designable structure, and are ideal candidate materials for developing low-cost, efficient and environmentally friendly energy storage batteries. Among them, organic small molecules have the characteristics of rich active sites and high structure control, which can maximize the use of exposed lithium storage sites and activity, and are a hot research direction in recent years. However, the high solubility and low conductivity of organic small molecules in organic electrolyte seriously limit the cycle life and rate performance of organic electrode materials. Studies have found that expanding the π-conjugated structure can enhance the interaction between molecules, promote the ordered arrangement of organic molecules, reduce the solubility, and be conducive to charge transfer, thereby improving the cycle stability and rate performance. Currently, non-redox active structures (such as benzene, naphthalene and other rigid structures) are usually used to expand the π-conjugated system, resulting in a decrease in theoretical capacity.
[0003] Therefore, how to reasonably design an organic electrode material with high capacity, fast charge and discharge, and long service life is still a very challenging problem. SUMMARY
[0004] In order to take into account the solubility and conductivity of organic small molecules, improve the capacity and rate performance, the present application provides an organic carbonyl compound electrode material and a preparation method thereof, and applies it to lithium ion battery cathode materials. The present application uses nitrogen-containing heterocyclic ring with redox activity to expand the π-conjugated system; the nitrogen-containing heterocyclic ring can provide active sites and improve the specific capacity; the expanded π-conjugated system can reduce the solubility of active molecules and improve the electron / ion conduction, thereby improving the cycle stability and rate performance. The organic carbonyl compound electrode material provided by the present application is a novel nitrogen-containing heterocyclic super-conjugated organic electrode material, which expands the N-heterocyclic conjugated organic structure, is conducive to improving the cycle stability and rate performance of the battery, and the C=N double bond as the redox active site can provide additional capacity contribution. The coordination of C=O and C=N with lithium ions realizes reversible ion storage in the charge and discharge process, thereby showing high capacity and excellent electrochemical performance.
[0005] In order to achieve the above object, the present application provides an organic carbonyl compound electrode material, which is a dipyrido[3',2':5,6;2'',3'':7,8]quinoxalino[2,3-i]dipyrido[3,2-a:2',3'-c]phenazine-10,21-dione, and has the following structural formula:
[0006] The pyridine-phenazine-benzoquinone organic electrode material of the present application is obtained by a simple dehydration condensation reaction of 1,2,4,5-tetraamino-p-benzoquinone and 1,10-phenanthroline-5,6-dione, and has the following structural formula:
[0007]
[0008] The present application also provides a preparation method of the above-mentioned organic carbonyl compound electrode material, which is obtained by a dehydration condensation reaction of 1,2,4,5-tetraamino-p-benzoquinone and 1,10-phenanthroline-5,6-dione.
[0009] Further, the preparation method comprises the following synthesis steps:
[0010] Step 1: under an inert atmosphere, 1,10-phenanthroline-5,6-dione and 1,2,4,5-tetraamino-p-benzoquinone are added into acetic acid, and heated and stirred for reaction;
[0011] Step 2: after the reaction is completed, washing, filtering and drying are performed to obtain the organic carbonyl compound electrode material.
[0012] Further, in step 1, the molar ratio of 1,10-phenanthroline-5,6-dione to 1,2,4,5-tetraamino-p-benzoquinone is 2-3:1.
[0013] Further, in step 1, the heating and stirring reaction is performed under the following conditions: first stirring at room temperature for 30-60 minutes, then heating to 100-120℃ and stirring to reflux for 12-24 hours.
[0014] Further, in step 1, the inert atmosphere is nitrogen or argon.
[0015] Further, in step 2, the filtering is performed by washing with hot acetic acid, acetone and ethanol respectively for three times.
[0016] The present application also provides an application of the above-mentioned organic carbonyl compound electrode material in a positive electrode material of a lithium ion battery.
[0017] Further, the organic carbonyl compound electrode material, the conductive carbon and the crosslinking agent are ground into a slurry in an organic solvent, coated on an aluminum foil current collector, dried at 60-80 DEG C in vacuum for 12-24 hours to form a positive electrode sheet; a lithium metal is used as a negative electrode, Celgrad is used as a separator, an electrolyte is added, and a button cell is assembled in an argon-filled glove box.
[0018] Further, the conductive carbon material is a conductive slurry, the crosslinking agent is polyvinylidene fluoride (PVDF), the electrolyte is a 1-2 M lithium bis(trifluoromethylsulfonyl)imide solution (LiTFSI), and the solvent is ethylene glycol dimethyl ether (DME) and 1,3-dioxolane (DOL) in a volume ratio of 1:1-1:3.
[0019] The organic carbonyl compound electrode material is used as a positive electrode material in a lithium ion battery, has a large conjugated system, has good dissolution inertness in an electrolyte and is beneficial to electron transmission, thereby improving the cycle stability and rate performance of the battery.
[0020] Compared with the prior art, the present application has the following beneficial effects:
[0021] 1. The present application provides a nitrogen-containing heterocyclic carbonyl compound organic electrode material, which is a dipyrido[3',2':5,6;2'',3'':7,8]quinoxalino[2,3-i]dipyrido[3,2-a:2',3'-c]phenazine-10,21-dione, referred to as a pyridine-phenazine-dione compound. The organic carbonyl compound electrode material is obtained by dehydration condensation of 1,2,4,5-tetraamino-p-benzoquinone and 1,10-phenanthroline-5,6-dione. The organic electrode material is used as a positive electrode material in a lithium ion battery, has a large conjugated system, has good dissolution inertness in an electrolyte and is beneficial to electron transmission, thereby improving the cycle stability and rate performance of the battery. In addition, the multiple active sites (C=O and C=N) provide more redox active sites for coordination with lithium ions, realize reversible lithium storage, and exhibit a high capacity.
[0022] 2、The pyridine-phenazine-benzoquinone organic molecule has a large pi conjugated system, which provides a stable molecular structure, and the introduction of a nitrogen-containing heterocycle provides more active sites and increases the theoretical specific capacity. In addition, a large number of conjugated systems are beneficial to charge transfer during charging and discharging, improve the lithium ion diffusion coefficient and electron conduction, the extended pi conjugated system can reduce the solubility of the active molecules and improve the electron / ion conduction, improve the cycle stability and rate performance. At the same time, the lone pair electrons of the C=N bond improve the redox activity of the pyridine-phenazine-benzoquinone, so that a higher cycle specific capacity and excellent rate performance are obtained in the lithium ion battery, and the synergistic coordination of C=O and C=N with lithium ions realizes reversible ion storage during charging and discharging, thereby showing higher capacity and excellent electrochemical performance.
[0023] 3、The pyridine-phenazine-benzoquinone organic small molecule positive electrode material is prepared by a simple condensation reaction, and the product has a simple and efficient preparation method, high yield, and green and inexpensive raw materials. As a positive electrode material applied in a lithium ion battery, it shows extremely high capacity, cycle stability and rate performance, significantly improves the capacity of traditional organic small molecule positive electrode materials, and has outstanding electrochemical performance. The lithium ion battery prepared by using the pyridine-phenazine-benzoquinone organic electrode material has a capacity of 295 mAh g -1 after 100 cycles at 0.2 Ag -1 , maintains 57% of the initial capacity (506 mAh g -1 ), and has a coulombic efficiency of 100%, showing extremely high capacity and cycle stability. At a current density of 5 Ag -1 , the capacity of the battery is 205 mAh g -1 , which has extremely high rate performance; when the current density returns to 0.1 Ag -1 , the capacity of the battery can still reach 398 mAh g -1 , which has high lithium storage reversibility. The pyridine-phenazine-benzoquinone organic electrode material obtained by the present application shows extremely high capacity density, stable cycle life and excellent rate performance as a positive electrode material of a lithium ion battery.
[0024] In addition to the purposes, features and advantages described above, the present application has other purposes, features and advantages. The present application will be further described below with reference to the drawings. BRIEF DESCRIPTION OF DRAWINGS
[0025] The accompanying drawings, which form a part of this application, are included to provide a further understanding of the application, illustrate preferred embodiments of the present application, and assist in explaining the present application. In the drawings:
[0026] Figure 1This is a schematic diagram of the synthetic route for the pyridine-phenazine-benzoquinone organic electrode material obtained in this invention;
[0027] Figure 2 The Fourier transform infrared spectrum of the pyridine-phenazine-benzoquinone organic electrode material obtained in Example 1 of this invention is shown below.
[0028] Figure 3 The nuclear magnetic resonance (NMR) spectra of the pyridine-phenazine-benzoquinone organic electrode material obtained in Example 1 of this invention are shown below.
[0029] Figure 4 This is a scanned image of the pyridine-phenazine-benzoquinone organic electrode material obtained in Example 1 of the present invention;
[0030] Figure 5 The powder X-ray diffraction pattern of the pyridine-phenazine-benzoquinone organic electrode material obtained in Example 1 of this invention;
[0031] Figure 6 Thermogravimetric analysis diagram of the pyridine-phenazine-benzoquinone organic electrode material obtained in Example 1 of this invention;
[0032] Figure 7 To test the lithium-ion battery fabricated using the pyridine-phenazine-benzoquinone organic electrode material obtained in Example 1 of this invention at 0.5 mV s -1 Cyclic voltammetry curves of lithium-ion batteries at scan rate;
[0033] Figure 8 To test the lithium-ion battery prepared using the pyridine-phenazine-benzoquinone organic electrode material obtained in Example 1 of this invention, at 0.2 Ag... -1 Charge-discharge curves of lithium-ion batteries with current density;
[0034] Figure 9 The graph shows the rate performance of lithium-ion batteries prepared using the pyridine-phenazine-benzoquinone organic electrode material obtained in Example 1 of this invention at different current densities.
[0035] Figure 10 The cyclic voltammetry curves of lithium-ion batteries prepared using the pyridine-phenazine-benzoquinone organic electrode material obtained in Example 1 of this invention are shown at different scan rates. Detailed Implementation
[0036] The embodiments of the present invention are described in detail below. These embodiments are implemented 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 embodiments.
[0037] The experimental methods used in the following examples are conventional methods unless otherwise specified. The reagents, materials, etc. used in the following examples are commercially available unless otherwise specified. The battery performance test in the following examples uses a blue battery test system and an Admeasure electrochemical workstation.
[0038] Example 1
[0039] A method for preparing an organic carbonyl compound electrode material, comprising the following steps:
[0040] Step 1: Under a nitrogen atmosphere, 210 mg (10 mmol) of 1,10-phenanthroline-5,6 dione (Macclin, purity 97%) and 80.08 mg (5 mmol) of 1,2,4,5-tetraamino-p-benzoquinone (Macclin, purity 97%) are placed in 50 mL of acetic acid, and the reactant ratio is ensured to be in excess of 1,10-phenanthroline-5,6 dione in order to reduce the generation of by-products. Stirring is carried out at room temperature for 30-60 minutes, and then the temperature is raised to 100-120°C for reflux stirring for 12-24 hours.
[0041] Step 2: After the reaction is completed, cooling is carried out to room temperature, the reacted mixture is poured into 200 mL of water, and washing is carried out three times with hot acetic acid, acetone, and ethanol respectively, and the obtained solid product is vacuum dried at 70°C to obtain the target product, i.e. pyridine-phenazine-benzoquinone.
[0042] Example 2
[0043] A method for preparing an organic carbonyl compound electrode material, comprising the following steps:
[0044] Step 1: Under a nitrogen atmosphere, 252 mg (12 mmol) of 1,10-phenanthroline-5,6 dione (Macclin, purity 97%) and 96.1 mg (6 mmol) of 1,2,4,5-tetraamino-p-benzoquinone (Macclin, purity 97%) are placed in 80 mL of acetic acid, and the reactant ratio is ensured to be in excess of 1,10-phenanthroline-5,6 dione in order to reduce the generation of by-products. Stirring is carried out at room temperature for 30-60 minutes, and then the temperature is raised to 100-120°C for reflux stirring for 12-24 hours.
[0045] Step 2: After the reaction is completed, cooling is carried out to room temperature, the reacted mixture is poured into 400 mL of water, and washing is carried out three times with hot acetic acid, acetone, and ethanol respectively, and the obtained solid product is vacuum dried at 80°C to obtain the target product, i.e. pyridine-phenazine-benzoquinone.
[0046] Example 3
[0047] A method for preparing an organic carbonyl compound electrode material, comprising the following steps:
[0048] Step 1: 315 mg (15 mmol) of 1,10-phenanthroline-5,6-dione (Mcclin, purity 97%) and 120.01 mg (7.5 mmol) of 1,2,4,5-tetraamino-p-benzoquinone (Mcclin, purity 97%) were placed in 100 mL of acetic acid under an argon atmosphere, and the ratio of the reactants was ensured to be 1,10-phenanthroline-5,6-dione in excess so as to reduce the generation of by-products. Stirring was carried out at room temperature for 30-60 minutes, and then the temperature was raised to 100-120°C and stirring was carried out under reflux for 12-24 h.
[0049] Step 2: After the reaction was completed and cooled to room temperature, the reaction mixture was poured into 500 mL of water, and washed with hot acetic acid, acetone and ethanol three times respectively, and the obtained solid product was vacuum dried at 60°C to obtain the target product, i.e. pyridine-phenazine-benzoquinone.
[0050] Figure 1 The synthesis route of the pyridine-phenazine-benzoquinone organic electrode material obtained in the present application is shown in the figure. The product is prepared by simple dehydration condensation, the product preparation method is simple, the yield is high, and the raw materials used are green and cheap.
[0051] Figure 2 The Fourier transform infrared spectrum of the pyridine-phenazine-benzoquinone organic electrode material obtained in Example 1 of the present application is shown in the figure. Figure 2 It can be known from the figure that the peaks at 1648 cm -1 and 1535 cm -1 are respectively the stretching vibration peaks of C=O and C=N bonds in the pyridine-phenazine-benzoquinone compound, 1469 cm -1 , 1356 cm -1 and 708 cm -1 represent the stretching vibration peaks of C=C, C-N and C-H bonds, respectively, and there is no -NH2 stretching vibration band at 3313 cm -1 in the tetraamino-p-benzoquinone, indicating the synthesis of the compound.
[0052] Figure 3 The hydrogen spectrum and carbon spectrum of the pyridine-phenazine-benzoquinone organic electrode material obtained in Example 1 of the present application are shown in the figures. Figure 3 It can be known from the figures that the pyridine-phenazine-benzoquinone has 10.58, 9.62, 8.71 ppm three kinds of hydrogen in chemical environment under deuterated trifluoroacetic acid as the solvent. 1 The C NMR has 183.12, 152.45, 147.23, 142.69, 131.65, 130.34 ppm six kinds of carbon in chemical environment under deuterated trifluoroacetic acid as the solvent. 13
[0053] Figure 4 The scanning electron microscope (SEM) image of the pyridine-phenoxazine-benzoquinone organic electrode material obtained in Example 1 is shown in Figure 1. It can be seen from Figure 1 that the pyridine-phenoxazine-benzoquinone is a microrod, the surface of which is rough and has a relatively large specific surface area, which is conducive to the expression of the electrochemical performance of the pyridine-phenoxazine-benzoquinone. Figure 4
[0054] Figure 5 The powder X-ray diffraction (XRD) pattern of the pyridine-phenoxazine-benzoquinone organic electrode material obtained in Example 1 is shown in Figure 2. It can be seen from Figure 2 that the pyridine-phenoxazine-benzoquinone has obvious and sharp diffraction peaks at 10.5°, 12.8°, 16.6°, 22.3°, 23.8°, 25.7°, and 28.2°. The π-π interaction between the pyridine-phenoxazine-benzoquinone molecules is at 28.2°. Figure 5
[0055] Figure 6 The thermogravimetric analysis (TG) of the pyridine-phenoxazine-benzoquinone organic electrode material obtained in Example 1 is shown in Figure 3. In order to analyze the thermal stability of the pyridine-phenoxazine-benzoquinone organic electrode material, the thermogravimetric analysis (TG) was performed in an argon atmosphere, and the temperature range of the test was 25-700℃ at a heating rate of 10℃ / min. The results show that the material has good thermal stability below 550℃, which is conducive to the manufacture and operation of lithium ion batteries in various environments. The pyridine-phenoxazine-benzoquinone organic electrode materials obtained in Examples 2 and 3 have similar physical and chemical properties to the pyridine-phenoxazine-benzoquinone organic electrode material obtained in Example 1, and are not described here.
[0056] Application Example
[0057] The pyridine-phenoxazine-benzoquinone obtained in Example 1, the conductive paste, and the PVDF were stirred uniformly in a shaker at a mass ratio of 6:3:1 to form a slurry with good dispersibility, which was then uniformly coated on an aluminum foil current collector, and then vacuum dried at 60-80℃ for 12-24h to form an electrode sheet. The electrode sheet was used as a positive electrode, a lithium metal sheet was used as a negative electrode, a PP separator was used as a separator, and an electrolyte was a 1M lithium bis(trifluoromethylsulfonyl)imide (LiTFSI) solution (self-prepared) containing ethylene glycol dimethyl ether (DME) and 1,3-dioxolane (DOL) (volume ratio 1:1-1:3). A 2032 button cell was assembled in an argon-filled glove box, and the voltage range was 1.0V-3.5V vs Li / Li + .
[0058] Figure 7 The charge-discharge curves of the lithium ion battery using the pyridine-phenoxazine-benzoquinone organic electrode material obtained in Example 1 at a current density of 0.5mV s -1 -2.5mVs -1 Cyclic voltammograms of lithium ion batteries with different scan rates. The positions and shapes of the redox peaks of pyridine-phenazine-benzoquinone organic positive electrode material do not change when the scan rate is increased, indicating that the redox reaction of pyridine-phenazine-benzoquinone organic positive electrode material is highly reversible, which is conducive to the electrochemical performance of the battery. In addition, the cyclic voltammogram of the battery in the voltage range of 1.0-3.5 V shows three pairs of redox peaks, respectively, 2.97 / 3.15, 2.45 / 2.73 and 2.21 / 2.42 V (relative to Li / Li + ), indicating that pyridine-phenazine-benzoquinone can utilize the synergistic coordination of C=O and C=N groups with Li + to realize reversible storage of lithium ions.
[0059] Figure 8 The lithium ion battery prepared by using the pyridine-phenazine-benzoquinone organic electrode material obtained in Example 1 of the present application has a lithium ion battery charge-discharge curve under a current density of 0.2 Ag -1 . Through the four-cycle charge-discharge curve, it can be known that the curve profiles of the batteries are basically consistent, the specific capacity slowly decays, and the batteries have a high discharge platform. It is further indicated that the pyridine-phenazine-benzoquinone organic electrode material has excellent electrochemical performance.
[0060] Figure 9 The lithium ion battery prepared by using the pyridine-phenazine-benzoquinone organic electrode material obtained in Example 1 of the present application has a lithium ion battery charge-discharge curve under a current density of 0.2 Ag -1 . From the Figure 9 , it can be known that after 100 cycles under a current density of 0.2 Ag -1 , the capacity is 295 mAh g -1 , which maintains 57% of the initial capacity (506 mAh g -1 ), and the coulombic efficiency is as high as 100%. It can be seen that the pyridine-phenazine-benzoquinone organic electrode material has a very high specific capacity and stable cycle life.
[0061] Figure 10 The lithium ion battery prepared by using the pyridine-phenazine-benzoquinone organic electrode material obtained in Example 1 of the present application has a lithium ion battery rate performance graph under different current densities. From the Figure 10 , it can be known that under current densities of 0.1, 0.2, 0.3, 0.5, 1, 2, 3, 5 and 10 Ag -1 , the capacities of the batteries are 445, 385, 328, 307, 287, 260, 234, 205 and 150 mAh g -1 , respectively. When the current density returns to 0.1 Ag -1 , the capacity of the battery can still reach 398 mAh g -1, which indicates that pyridine-phenazine-benzoquinone has high lithium storage reversibility. The electrochemical performance of lithium ion batteries prepared by using the pyridine-phenazine-benzoquinone organic electrode material prepared in Example 2 and Example 3 as the positive electrode material of the lithium ion batteries is similar to the electrochemical performance of lithium ion batteries prepared by using the pyridine-phenazine-benzoquinone organic electrode material prepared in Example 1 as the positive electrode material of the lithium ion batteries, and thus is not described herein.
[0062] Therefore, the nitrogen-containing heterocyclic pyridine-phenazine-benzoquinone organic electrode material prepared in the application has good electrochemical performance when applied as the positive electrode material in lithium ion batteries.
[0063] In summary, the application provides a nitrogen-containing heterocyclic carbonyl compound organic electrode material, which is dipyrido[3',2':5,6;2'',3'':7,8]quinoxalino[2,3-i]dipyrido[3,2-a:2',3'-c]phenazine-10,21-dione, referred to as pyridine-phenazine-diquinone compound. The organic carbonyl compound electrode material is obtained by dehydration condensation reaction of 1,2,4,5-tetraamino-p-benzoquinone and 1,10-phenanthroline-5,6-dione. When the organic electrode material is applied as the positive electrode material in lithium ion batteries, due to the presence of a large conjugated system, the organic electrode material has good dissolution inertness in electrolyte and is beneficial to electron transmission, thereby improving the cycle stability and rate performance of the battery. In addition, the multiple active sites (C=O and C=N) provide more redox active sites for coordination with lithium ions, realizing reversible lithium storage and exhibiting high capacity.
[0064] The large π conjugated system of the pyridine-phenazine-benzoquinone organic molecule in the application provides a stable molecular structure, the introduction of the nitrogen-containing heterocyclic ring provides more active sites, and the theoretical specific capacity is increased. In addition, in the charging and discharging process, a large number of conjugated systems are beneficial to charge transmission, improve the lithium ion diffusion coefficient and electron conduction, the extended π conjugated system can reduce the solubility of the active molecules and improve the electron / ion conduction, improve the cycle stability and rate performance. At the same time, the lone pair electrons of the C=N bond improve the redox activity of the pyridine-phenazine-benzoquinone, thereby obtaining high cycle specific capacity and excellent rate performance in lithium ion batteries. The C=O and C=N coordinate with lithium ions, realizing reversible storage of ions in the charging and discharging process, thereby exhibiting high capacity and excellent electrochemical performance.
[0065] In addition, the pyridine-phenazine-benzoquinone organic small molecule positive electrode material in the application is prepared by simple condensation reaction, the product preparation method is simple and efficient, the yield is high, the raw materials used are green and inexpensive, and the pyridine-phenazine-benzoquinone organic small molecule positive electrode material applied as the positive electrode material in lithium ion batteries shows extremely high capacity, cycle stability and rate performance, significantly improves the capacity of traditional organic small molecule positive electrode materials, and has outstanding electrochemical performance.
[0066] The above description is only the preferred embodiment of the present application, and is not intended to limit the present application. The present application can have various changes and modifications for those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims
1. Use of an organic carbonyl compound electrode material in a positive electrode material for a lithium ion battery, characterized in that, The organic carbonyl compound electrode material is a dipyrido quinoxaline[2,3-i]dipyridophenazine-10,21-diquinone, having the structural formula shown below: quinoxaline[2,3-i]dipyridophenazine-10,21-diquinone, having the structural formula shown below: ； The organic carbonyl compound electrode material, conductive carbon and polyvinylidene fluoride are ground into a slurry in an organic solvent, coated on an aluminum foil current collector, vacuum dried at 60-80 DEG C for 12-24 h to form a positive electrode sheet; a lithium metal is used as a negative electrode, Celgard is used as a separator, an electrolyte is added, and a button cell is assembled in an argon-filled glove box; The electrolyte is a 1-2 M lithium bis-trifluoromethylsulfonylimide solution, and the solvent is ethylene glycol dimethyl ether and 1,3-dioxolane in a volume ratio of 1:1-1:
3.
2. Use according to claim 1, characterized in that, The organic carbonyl compound electrode material is obtained by dehydration condensation of 1,2,4,5-tetraaminoparabenzoquinone and 1,10-phenanthroline-5,6-dione.
3. Use according to claim 2, characterized in that, The method comprises the following steps: Step 1: under an inert atmosphere, 1,10-phenanthroline-5,6-dione and 1,2,4,5-tetraaminoparabenzoquinone are added to acetic acid, and heated and stirred to react; Step 2: after the reaction is completed, washing, filtering and drying are performed to obtain the organic carbonyl compound electrode material.
4. Use according to claim 3, characterized in that, In step 1, the molar ratio of 1,10-phenanthroline-5,6-dione to 1,2,4,5-tetraaminoparabenzoquinone is 2-3:
1.
5. Use according to claim 3, characterized in that, In step 1, the heating and stirring conditions are: first stirring at room temperature for 30-60 min, then heating to 100-120 DEG C and stirring to reflux for 12-24 h.
6. Use according to claim 3, characterized in that, In step 1, the inert atmosphere is nitrogen or argon.
7. Use according to claim 3, characterized in that, In step 2, the filtering is performed by washing with hot acetic acid, acetone and ethanol three times, respectively.
8. The use according to claim 1, characterized in that, The conductive carbon is a conductive slurry.