CN116169260A - β”-Al 2 O 3 And N-doped C composite coated Na 3 V 2 (PO 4 ) 2 F 3 Electrode material - Google Patents

β”-Al 2 O 3 And N-doped C composite coated Na 3 V 2 (PO 4 ) 2 F 3 Electrode material Download PDF

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CN116169260A
CN116169260A CN202211656627.3A CN202211656627A CN116169260A CN 116169260 A CN116169260 A CN 116169260A CN 202211656627 A CN202211656627 A CN 202211656627A CN 116169260 A CN116169260 A CN 116169260A
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张露露
孙畅
裴丰
丁晓凯
杨学林
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Hubei Yihua Chemical Technology R&d Co ltd
China Three Gorges University CTGU
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Abstract

The invention provides a method based onβ''‑Al 2 O 3 And N-doped C composite coated Na 3 V 2 (PO 4 ) 2 F 3 A preparation method of an electrode material. Firstly, sequentially dissolving citric acid, vanadium pentoxide, ammonium dihydrogen phosphate and sodium fluoride in deionized water, stirring at 60 ℃ until gel is formed, drying, and placing the obtained powder in a tube furnace to obtain Na through a two-step heat treatment process 3 V 2 (PO 4 ) 2 F 3 The method comprises the steps of carrying out a first treatment on the surface of the Then Na is added 3 V 2 (PO 4 ) 2 F 3 And dopamine hydrochlorideDispersing in tris (hydroxymethyl) aminomethane hydrochloride aqueous solution, stirring, addingβ''‑Al 2 O 3 Stirring 23 and h, vacuum filtering, drying, and heat treating in a tube furnace to obtainβ''‑Al 2 O 3 And N-doped C composite coated Na 3 V 2 (PO 4 ) 2 F 3 An electrode material. The preparation method of the electrode material is simple, and the sodium ion half battery assembled by using the electrode material as the positive electrode has ideal capacity performance and stable cycle performance, and has potential application value in sodium ion batteries.

Description

β”-Al 2 O 3 And N-doped C composite coated Na 3 V 2 (PO 4 ) 2 F 3 Electrode material
Technical Field
The invention belongs to the field of electrochemistry and new energy materials, and in particular relates to a novel material based on beta' -Al 2 O 3 And N-doped C composite coated Na 3 V 2 (PO 4 ) 2 F 3 A preparation method of an electrode material.
Background
In recent years, lithium ion batteries have been widely used as efficient energy storage devices in various fields such as portable electronic markets, electric vehicles, and energy storage power stations, resulting in a large consumption of lithium resources and an increase in cost. Therefore, sodium ion batteries based on sodium elements, which are abundant in resources and inexpensive, have received attention again. Sodium ion batteries are similar to lithium ion batteries in their operating mechanism, also known as "rocking chair batteries" which are recyclable, in that sodium ions undergo reversible deintercalation in a positive and negative host structure during charge and discharge. The sodium ion battery can use electrolyte solvents and electrolyte salts with lower decomposition potential, so that the selection range of the electrolyte is wider. In addition, sodium and aluminum do not undergo alloying reaction, and the sodium ion battery can use aluminum foil as a current collector of positive and negative electrode materials to replace a more expensive and heavier copper current collector, reduce the cost of the battery and improve the energy density. Therefore, sodium ion batteries are considered as the next generation secondary batteries that are the most promising alternatives to lithium ion batteries.
The positive electrode material influences the performance of the batteryKey factor, na 3 V 2 (PO 4 ) 2 F 3 The high-voltage sodium ion battery positive electrode material is considered to be one of the most promising high-voltage sodium ion battery positive electrode materials by virtue of stable crystal structure, high working voltage (about 3.9V) and high energy density (about 500 Wh/kg). Na (Na) 3 V 2 (PO 4 ) 2 F 3 With a three-dimensional open frame structure, larger channel gaps facilitate rapid migration of sodium ions, allowing for faster diffusion kinetics and higher power densities. However, due to Na 3 V 2 (PO 4 ) 2 F 3 [ V ] in the Structure 2 O 8 F 3 ]Dioctahedral quilt [ PO ] 4 ]Tetrahedral separation results in a lower intrinsic conductivity, severely limiting the electrochemical performance. In addition, na 3 V 2 (PO 4 ) 2 F 3 In the charge and discharge process, higher voltage is needed, so that side reactions are easy to occur between the active substance and the electrolyte, and the cycle performance of the material is reduced. Carbon to Na utilizing high electron conductivity 3 V 2 (PO 4 ) 2 F 3 Coating is carried out to solve Na 3 V 2 (PO 4 ) 2 F 3 A common method for low electron conductivity and side reaction inhibition is to make the carbon coating layer too thin, but if the effect of improving electron conductivity and side reaction inhibition is not obvious, the too thick carbon coating layer can prevent sodium ion transmission due to poor sodium ion conduction capability of the carbon material, so even Na obtained by carbon coating modification 3 V 2 (PO 4 ) 2 F 3 The electrochemical properties of the electrode material are also less satisfactory.
Disclosure of Invention
The invention aims to provide a composite material based on beta' -Al 2 O 3 And N-doped C composite coated Na 3 V 2 (PO 4 ) 2 F 3 A preparation method of an electrode material. The related synthetic raw materials are citric acid (chelating agent), vanadium pentoxide (vanadium source), ammonium dihydrogen phosphate (phosphorus source), sodium fluoride (fluorine source and sodium source), dopamine hydrochloride (carbon source), tris hydrochloride (buffer solution) and beta' -Al 2 O 3 (sodium fast ion conductor).
Al 2 O 3 There are many isomorphous crystals, 10 known, mainly 3 crystal forms, i.e. alpha-Al 2 O 3 、β-Al 2 O 3 、γ-Al 2 O 3 . Al of different crystal forms 2 O 3 Due to the different structures, the properties are also different. In the technical scheme of the invention, the electrolyte material Na-beta-Al of the sodium-sulfur battery is adopted 2 O 3 (commonly referred to as beta "-Al 2 O 3 ) The chemical formula is Na 2 O·5.33Al 2 O 3 The space group is R-3m, and the unit cell parameter is
Figure BDA0004013020410000021
Due to the excellent adhesiveness and film-forming properties of dopamine, dopamine is uniformly attached to Na 3 V 2 (PO 4 ) 2 F 3 The particle surface is polymerized, and then after dopamine is polymerized for a period of time, beta' -Al is adsorbed by means of good adhesion of the dopamine 2 O 3 And finally, calcining the nano particles at high temperature to pyrolyze polymerized dopamine to obtain N-doped C/beta' -Al 2 O 3 N-doped C three-layer uniformly coated Na 3 V 2 (PO 4 ) 2 F 3 An electrode material. Compared with the traditional C coating and C and other crystal forms Al 2 O 3 Composite coating is carried out by beta' -Al 2 O 3 N-doped C/beta' -Al obtained from dopamine with excellent film forming properties 2 O 3 The N-doped C three-layer coating realizes perfect combination of high electron conductivity and high ion conductivity of the coating layer; in addition, the three-layer coating can more effectively inhibit side reaction between the active substance and the electrolyte, stabilize the material structure and improve the circulation stability of the material; in addition, the N-doped C obtained by pyrolysis of polymerized dopamine can also generate edge defects, so that adsorption and storage of sodium ions are improved, and the capacity is further improved; in particular, C and beta' -Al are doped by N 2 O 3 Synergistic modification of the two reduces Na 3 V 2 (PO 4 ) 2 F 3 Polarization under high multiplying power effectively improves Na 3 V 2 (PO 4 ) 2 F 3 Is a ratio of the rate performance of (2). The sodium ion battery anode is used as a sodium ion battery anode, has high capacity, excellent multiplying power performance and cycle performance, and has great potential application value.
The preparation method comprises the following steps:
s1, sequentially dissolving citric acid and vanadium pentoxide in deionized water, stirring for a period of time, adding ammonium dihydrogen phosphate and sodium fluoride, continuously stirring at 60 ℃ until gel is formed, drying, and placing the obtained powder in a tube furnace to obtain Na through a two-step heat treatment process 3 V 2 (PO 4 ) 2 F 3 ；
S2, na prepared by S1 3 V 2 (PO 4 ) 2 F 3 Dispersing dopamine hydrochloride in Tris hydrochloride water solution, regulating pH, stirring for a period of time, and adding beta' -Al 2 O 3 Stirring for a while, suction filtering, drying, and heat treating in tubular furnace to obtain beta' -Al 2 O 3 And N-doped C composite coated Na 3 V 2 (PO 4 ) 2 F 3 An electrode material.
Preferably, in step S1, the molar mass ratio of the citric acid, the vanadium pentoxide, the ammonium dihydrogen phosphate and the sodium fluoride is 0.3-1.5: 1:2:3, a step of; sequentially dissolving citric acid, vanadium pentoxide, ammonium dihydrogen phosphate and sodium fluoride in deionized water; the stirring time is 0.2-0.8 h.
Preferably, in the step S1, the two-step heat treatment process is to sinter for 3-5 hours at 200-400 ℃ in nitrogen or argon, and then sinter for 6-10 hours at 400-800 ℃.
Preferably, in step S2, the dopamine hydrochloride is added in an amount of Na 3 V 2 (PO 4 ) 2 F 3 8-12 wt.% of the mass. The concentration of the Tris hydrochloride aqueous solution is 0.8-1.2 g/L; the pH value of the adjustment is 8-9; beta' -Al 2 O 3 The addition amount of (2) is 0.2-1.0 wt.%.
Preferably, in step S2, the stirring period is 0.5-1.5 h; continuously stirring for 14-23 hours; the secondary heat treatment is sintering for 7-9 h at 500-700 ℃ in nitrogen or argon.
The invention is based on beta' -Al 2 O 3 And N-doped C composite coated Na 3 V 2 (PO 4 ) 2 F 3 The electrode material and the preparation method thereof have the following characteristics:
(1) The experimental process is simple and easy to operate, and only NVPF and beta' -Al are needed 2 O 3 Mixing with dopamine, sintering at a certain temperature to obtain beta' -Al 2 O 3 And N-doped C composite coated Na 3 V 2 (PO 4 ) 2 F 3 An electrode material.
(2) The material has good cycle performance, and the beta' -Al in the obtained product 2 O 3 The structure contains a sodium oxide layer for sodium ion migration and has high sodium content and other crystal forms of Al 2 O 3 The ion conductivity of the non-reachable excellent sodium ion conductivity can reach 0.2 to 0.4S cm at 300 ℃ and room temperature -1 And 2X 10 -3 S cm -1 。β”-Al 2 O 3 And the N-doped C composite coating layer can effectively reduce the contact between the matrix and the electrolyte, thereby inhibiting side reaction between the active substance and the electrolyte and stabilizing the material structure.
(3) The material rate capacity is high (introducing dopamine to promote Na 3 V 2 (PO 4 ) 2 F 3 Is introduced with beta' -Al 2 O 3 The migration rate of sodium ions is improved, and the polarization of the active material under high multiplying power is reduced by the synergistic modification of the sodium ions and the active material, so that Na is effectively improved 3 V 2 (PO 4 ) 2 F 3 Is a rate capability).
Drawings
FIG. 1 shows XRD patterns of samples prepared in comparative example 1, comparative example 2 and example 2.
FIG. 2 is a graph showing (a) charge and discharge performance and (b) cycle performance of the sample prepared in comparative example 1 at 1C; and (C) a charge-discharge performance map and (d) a cycle performance map at 0.5C.
FIG. 3 is a graph showing (a) charge and discharge performance and (b) cycle performance of the sample prepared in comparative example 2 at 1C; and (C) a charge-discharge performance map and (d) a cycle performance map at 0.5C.
FIG. 4 is a graph showing (a) charge-discharge performance and (b) cycle performance of the sample prepared in comparative example 3.
FIG. 5 is a graph showing (a) charge and discharge properties and (b) cycle properties of the sample prepared in example 1.
FIG. 6 is a graph showing (a) charge and discharge performance and (b) cycle performance of the sample prepared in example 2 at 1C; and (C) a charge-discharge performance map and (d) a cycle performance map at 0.5C.
FIG. 7 is a graph showing (a) charge and discharge properties and (b) cycle properties of the sample prepared in example 3.
Detailed Description
The present invention will be further described with reference to the following comparative examples and examples, by which the essential features and advantages of the present invention are highlighted.
Comparative example 1
Sequentially dissolving 12mmol of citric acid and 10mmol of vanadium pentoxide in 100mL of deionized water, stirring for 0.5h, adding 20mmol of ammonium dihydrogen phosphate and 30mmol of sodium fluoride, stirring at 60deg.C until gel is formed, drying, placing the obtained powder in a tube furnace, calcining at 300deg.C for 4h (N) 2 Atmosphere), then calcined at 600℃for 8h (N) 2 Atmosphere) to obtain C-coated Na 3 V 2 (PO 4 ) 2 F 3 Electrode material (designated as C@NVPF). FIG. 1 is an XRD pattern of the prepared C@NVPF, which is seen to be consistent with the NVPF (PDF#04-012-2207) card. This was assembled as a positive electrode material into a sodium-ion half cell at 1C (1c=128 mA g -1 ) The charge and discharge test is carried out under the multiplying power, and the specific capacity of the first discharge is 109.9mAh g -1 (FIG. 2 a) with a capacity retention of 84.8% after 100 cycles (FIG. 2 b); the reversible capacity at 0.5C rate was 120.0mAh g -1 (FIG. 2 c) the capacity retention after 100 cycles was 70.1% (FIG. 2 d).
Comparative example 2
Sequentially dissolving 5mmol of citric acid and 10mmol of vanadium pentoxide in 1In 00mL deionized water, stirring for 0.5h, adding 20mmol ammonium dihydrogen phosphate and 30mmol sodium fluoride, stirring at 60deg.C until gel is formed, drying, placing the obtained powder in a tube furnace, calcining at 300deg.C for 4h (N) 2 Atmosphere), then calcined at 600℃for 8h (N) 2 Atmosphere) to give Na 3 V 2 (PO 4 ) 2 F 3 The method comprises the steps of carrying out a first treatment on the surface of the Na is mixed with 3 V 2 (PO 4 ) 2 F 3 And 10wt.% dopamine hydrochloride in Tris hydrochloride aqueous solution with pH value of 8.5 and concentration of 1g/L, stirring for 24h, suction filtering, drying, placing in a tube furnace again, calcining at 600deg.C for 8h (N) 2 Atmosphere) to obtain N-doped C-coated Na 3 V 2 (PO 4 ) 2 F 3 Electrode material (designated NC@NVPF). FIG. 1 is an XRD pattern of the NC@NVPF prepared, which is seen to be consistent with the NVPF (PDF#04-012-2207) card. This was assembled as a positive electrode material into a sodium-ion half cell at 1C (1c=128 mA g -1 ) The charge and discharge test is carried out under the multiplying power, and the specific capacity of the first discharge is 111.8mAh g -1 (FIG. 3 a) the capacity retention after 100 cycles was 90.8% (FIG. 3 b); reversible capacity at 0.5C rate was 121.6mAh g -1 (FIG. 3 c) the capacity retention after 100 cycles was 89.4% (FIG. 3 d).
Comparative example 3
Sequentially dissolving 5mmol of citric acid and 10mmol of vanadium pentoxide in 100mL of deionized water, stirring for 0.5h, adding 20mmol of ammonium dihydrogen phosphate and 30mmol of sodium fluoride, stirring at 60deg.C until gel is formed, drying, placing the obtained powder in a tube furnace, calcining at 300deg.C for 4h (N) 2 Atmosphere), then calcined at 600℃for 8h (N) 2 Atmosphere) to give Na 3 V 2 (PO 4 ) 2 F 3 The method comprises the steps of carrying out a first treatment on the surface of the Na is mixed with 3 V 2 (PO 4 ) 2 F 3 And 10wt.% dopamine hydrochloride dispersed in Tris hydrochloride aqueous solution with pH value of 8.5 and concentration of 1g/L, and 0.5wt.% Al is added after stirring for 1h 2 O 3 Stirring for 23 hr, suction filtering, drying, calcining at 600deg.C for 8 hr (N) 2 Atmosphere) to obtain Al 2 O 3 And N-doped C composite coated Na 3 V 2 (PO 4 ) 2 F 3 Electrode material (denoted as NC@0.5Al) 2 O 3 @ NVPF). This was assembled as a positive electrode material into a sodium-ion half cell at 1C (1c=128 mA g -1 ) The charge and discharge test is carried out under the multiplying power, and the specific capacity of the first discharge is 104.6mAh g -1 (FIG. 4 a) and a capacity retention of 93.4% after 100 cycles (FIG. 4 b).
Example 1
Sequentially dissolving 5mmol of citric acid and 10mmol of vanadium pentoxide in 100mL of deionized water, stirring for 0.5h, adding 20mmol of ammonium dihydrogen phosphate and 30mmol of sodium fluoride, stirring at 60deg.C until gel is formed, drying, placing the obtained powder in a tube furnace, calcining at 300deg.C for 4h (N) 2 Atmosphere), then calcined at 600℃for 8h (N) 2 Atmosphere) to give Na 3 V 2 (PO 4 ) 2 F 3 The method comprises the steps of carrying out a first treatment on the surface of the Na is mixed with 3 V 2 (PO 4 ) 2 F 3 And 10wt.% dopamine hydrochloride dispersed in Tris hydrochloride aqueous solution with pH value of 8.5 and concentration of 1g/L, and 0.2wt.% beta' -Al is added after stirring for 1h 2 O 3 Stirring for 23 hr, suction filtering, drying, calcining at 600deg.C for 8 hr (N) 2 Atmosphere) to give beta' -Al 2 O 3 And N-doped C composite coated Na 3 V 2 (PO 4 ) 2 F 3 Electrode material (denoted as NC@0.2 beta' -Al) 2 O 3 @ NVPF). This was assembled as a positive electrode material into a sodium-ion half cell at 1C (1c=128 mA g -1 ) The charge and discharge test is carried out under the multiplying power, and the specific capacity of the first discharge is 115.3mAh g -1 (FIG. 5 a) with a capacity retention of 94.2% (FIG. 5 b) after 100 cycles, shows better electrochemical performance.
Example 2
Sequentially dissolving 5mmol of citric acid and 10mmol of vanadium pentoxide in 100mL of deionized water, stirring for 0.5h, adding 20mmol of ammonium dihydrogen phosphate and 30mmol of sodium fluoride, stirring at 60deg.C until gel is formed, drying, placing the obtained powder in a tube furnace, calcining at 300deg.C for 4h (N) 2 Atmosphere), then calcined at 600℃for 8h (N) 2 Atmosphere) to give Na 3 V 2 (PO 4 ) 2 F 3 The method comprises the steps of carrying out a first treatment on the surface of the Na is mixed with 3 V 2 (PO 4 ) 2 F 3 And 10wt.% dopamine hydrochloride dispersed in Tris hydrochloride aqueous solution with pH value of 8.5 and concentration of 1g/L, and 0.5wt.% beta' -Al is added after stirring for 1h 2 O 3 Stirring for 23 hr, suction filtering, drying, calcining at 600deg.C for 8 hr (N) 2 Atmosphere) to give beta' -Al 2 O 3 And N-doped C composite coated Na 3 V 2 (PO 4 ) 2 F 3 Electrode material (denoted as NC@0.5 beta' -Al) 2 O 3 @ NVPF). FIG. 1 shows the prepared NC@0.5 beta "-Al 2 O 3 XRD pattern of @ NVPF, it can be seen that the XRD pattern is consistent with that of NVPF (PDF#04-012-2207) card. This was assembled as a positive electrode material into a sodium-ion half cell at 1C (1c=128 mA g -1 ) The charge and discharge test is carried out under the multiplying power, and the specific capacity of the first discharge is 117.4mAh g -1 (FIG. 6 a) the capacity retention after 100 cycles was 97.8% (FIG. 6 b); the reversible capacity at 0.5C rate was 124.9mAh g -1 (FIG. 6 c) after 100 cycles the capacity retention was 97.3% (FIG. 6 d), showing better electrochemical performance.
Example 3
Sequentially dissolving 5mmol of citric acid and 10mmol of vanadium pentoxide in 100mL of deionized water, stirring for 0.5h, adding 20mmol of ammonium dihydrogen phosphate and 30mmol of sodium fluoride, stirring at 60deg.C until gel is formed, drying, placing the obtained powder in a tube furnace, calcining at 300deg.C for 4h (N) 2 Atmosphere), then calcined at 600℃for 8h (N) 2 Atmosphere) to give Na 3 V 2 (PO 4 ) 2 F 3 The method comprises the steps of carrying out a first treatment on the surface of the Na is mixed with 3 V 2 (PO 4 ) 2 F 3 And 10wt.% dopamine hydrochloride dispersed in Tris hydrochloride aqueous solution with pH value of 8.5 and concentration of 1g/L, and 1.0wt.% beta' -Al is added after stirring for 1h 2 O 3 Stirring for 23 hr, suction filtering, drying, calcining at 600deg.C for 8 hr (N) 2 Atmosphere) to give beta' -Al 2 O 3 And N-doped C composite coated Na 3 V 2 (PO 4 ) 2 F 3 Electrode material (denoted as NC@1.0 beta'-Al 2 O 3 @ NVPF). This was assembled as a positive electrode material into a sodium-ion half cell at 1C (1c=128 mA g -1 ) The charge and discharge test is carried out under multiplying power, and the specific capacity of the first discharge is 113.0mAh g -1 (FIG. 7 a) with a capacity retention of 95.9% (FIG. 7 b) after 100 cycles, showing better electrochemical performance.
The self-polymerization time of dopamine hydrochloride can affect the thickness of the nitrogen-doped carbon coating. To explore the thickness of the nitrogen-doped carbon coating layer, beta' -Al is introduced 2 O 3 To the effect of (a) we add example 4, example 5 and example 6, the procedure is the same as in example 2, and the stirring speed is 300rpm. The difference is that Na 3 V 2 (PO 4 ) 2 F 3 And 10wt.% dopamine hydrochloride dispersed in Tris hydrochloride aqueous solution with pH value of 8.5 and concentration of 1g/L, and then added with 0.5wt.% beta' -Al after stirring for 2 hours, 5 hours and 10 hours respectively 2 O 3 . They were assembled as positive electrode materials to form sodium-ion half-cells at 1C (1c=128 mA g -1 ) Charge and discharge tests were performed at magnification and table 1 summarizes the electrochemical performance of each example as a positive electrode material for sodium ion batteries. The specific capacity for the first discharge in example 4 was 116.0mAh g -1 The capacity retention rate after 100 cycles is 96.6%; the specific capacity for the first discharge of example 5 was 115.9mAh g -1 The capacity retention after 100 cycles was 97.2%; the specific capacity for the first discharge in example 6 was 113.2mAh g -1 The capacity retention rate after 100 cycles is 97.1%, and the electrochemical performance is good.
Table 1 electrochemical performance table for each example as a positive electrode material for sodium ion battery
Table 1 electrochemical performance table for each example as a positive electrode material for sodium ion battery
Figure BDA0004013020410000061
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Claims (10)

1. Based onβ''-Al 2 O 3 And N-doped C composite coated Na 3 V 2 (PO 4 ) 2 F 3 The preparation method of the electrode material is characterized by comprising the following steps:
s1, sequentially dissolving citric acid and vanadium pentoxide in deionized water, stirring for a period of time, adding ammonium dihydrogen phosphate and sodium fluoride, continuously stirring until gel is formed, drying, and placing the obtained powder in a tube furnace for heat treatment to obtain Na 3 V 2 (PO 4 ) 2 F 3 ；
S2 Na prepared by S1 3 V 2 (PO 4 ) 2 F 3 Dispersing dopamine hydrochloride in tris (hydroxymethyl) aminomethane hydrochloride aqueous solution, regulating pH, stirring, mixing, and addingβ''-Al 2 O 3 Stirring for a while, suction filtering, drying, and heat treating in a tube furnace to obtainβ''-Al 2 O 3 And N-doped C composite coated Na 3 V 2 (PO 4 ) 2 F 3 An electrode material.
2. A base according to claim 1β''-Al 2 O 3 And N-doped C composite coated Na 3 V 2 (PO 4 ) 2 F 3 The preparation method of the electrode material is characterized in that in the step S1, the molar mass ratio of the citric acid to the vanadium pentoxide to the ammonium dihydrogen phosphate to the sodium fluoride is 0.3-1.5: 1:2:3, a step of; sequentially dissolving citric acid, vanadium pentoxide, ammonium dihydrogen phosphate and sodium fluoride in deionized water; and stirring for 0.2-0.8 h.
3. A base according to claim 1β''-Al 2 O 3 And N-doped C composite coated Na 3 V 2 (PO 4 ) 2 F 3 The preparation method of the electrode material is characterized in that in the step S1, the two-step heat treatment process is that the electrode material is sintered for 3-5 hours at 200-400 ℃ in nitrogen or argon, and then sintered for 6-10 hours at 400-800 ℃.
4. A base according to claim 1β''-Al 2 O 3 And N-doped C composite coated Na 3 V 2 (PO 4 ) 2 F 3 The preparation method of the electrode material is characterized in that in the step S2, the addition amount of the dopamine hydrochloride is Na 3 V 2 (PO 4 ) 2 F 3 8-12% of mass; the concentration of the tris (hydroxymethyl) aminomethane hydrochloride aqueous solution is 0.8-1.2 g/L.
5. A base according to claim 1β''-Al 2 O 3 And N-doped C composite coated Na 3 V 2 (PO 4 ) 2 F 3 The preparation method of the electrode material is characterized in that the pH value is adjusted to 8-9.
6. A base according to claim 1β''-Al 2 O 3 And N-doped C composite coated Na 3 V 2 (PO 4 ) 2 F 3 The preparation method of the electrode material is characterized in that in the step S2,β''-Al 2 O 3 the addition amount of the catalyst is 0.2-1.0 wt.%.
7. A base according to claim 1β''-Al 2 O 3 And N-doped C composite coated Na 3 V 2 (PO 4 ) 2 F 3 The preparation method of the electrode material is characterized in that in the step S2, the following steps are addedβ''-Al 2 O 3 And stirring for 14-23 h.
8. A base according to claim 1β''-Al 2 O 3 And N-doped C composite coated Na 3 V 2 (PO 4 ) 2 F 3 The preparation method of the electrode material is characterized in that the heat treatment is carried out again in the step (2) and the electrode material is sintered for 7-9 hours at the temperature of 500-700 ℃ in nitrogen or argon.
9. The preparation method according to any one of claims 1 to 5β''-Al 2 O 3 And N-doped C composite coated Na 3 V 2 (PO 4 ) 2 F 3 An electrode material.
10. The method according to claim 9β''-Al 2 O 3 And N-doped C composite coated Na 3 V 2 (PO 4 ) 2 F 3 The application of the electrode material in preparing the positive electrode material of the sodium ion battery.
CN202211656627.3A 2022-12-22 2022-12-22 β”-Al 2 O 3 And N-doped C composite coated Na 3 V 2 (PO 4 ) 2 F 3 Electrode material Pending CN116169260A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116825968A (en) * 2023-07-21 2023-09-29 三峡大学 Preparation method of black phosphorus composite negative plate with three-dimensional electron/ion mass transfer channel
CN116826005A (en) * 2023-07-21 2023-09-29 三峡大学 Black phosphorus composite material for negative electrode of sodium ion battery and preparation method and application thereof

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116825968A (en) * 2023-07-21 2023-09-29 三峡大学 Preparation method of black phosphorus composite negative plate with three-dimensional electron/ion mass transfer channel
CN116826005A (en) * 2023-07-21 2023-09-29 三峡大学 Black phosphorus composite material for negative electrode of sodium ion battery and preparation method and application thereof
CN116825968B (en) * 2023-07-21 2024-03-19 三峡大学 Preparation method of black phosphorus composite negative plate with three-dimensional electron/ion mass transfer channel
CN116826005B (en) * 2023-07-21 2024-03-19 三峡大学 Black phosphorus composite material for negative electrode of sodium ion battery and preparation method and application thereof

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