CN111477857A - Hollow core-shell structure FeS2Preparation method and application of @ C nanocomposite - Google Patents
Hollow core-shell structure FeS2Preparation method and application of @ C nanocomposite Download PDFInfo
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Abstract
Hollow core-shell structure FeS2A preparation method and application of the @ C nanocomposite. The preparation method uses Fe2O3Is core material and polypyrrole is coating layer, and a one-step hydrothermal method is adopted to form hollow core-shell structure Fe2O3The @ PPy composite microspheres are coated with polypyrrole, so that the dispersibility of the ferric oxide is improved, the agglomeration of materials is avoided, and the hollow core-shell structure can be obtained through a further vulcanization calcination strategyForm FeS2@ C composite microspheres. Furthermore, the method reduces pollution caused by production, improves the utilization rate of materials, reduces the production energy consumption, and mainly adopts a simple, convenient and efficient two-step strategy to obtain the FeS with the hollow core-shell structure2The @ C composite microspheres greatly improve the production efficiency of the material. FeS of this particular structure2The @ C composite microspheres show excellent electrode material performance and have good application prospects.
Description
Technical Field
The invention relates to the field of energy nano material preparation. More particularly, it relates to a hollow core-shell structure FeS2A preparation method and application of the @ C nanocomposite.
Background
Although the current lithium ion battery technology is relatively mature, the problems of poor safety, short service life, poor low-temperature performance, high cost and the like still exist. The metal sodium has the advantages of abundant resources, low price and the like, and more researchers are dedicated to the research of the sodium ion battery. However, the radius of sodium ions (102pm) is large relative to lithium ions (76pm), and the choice of electrode material is a critical issue for sodium ion batteries. Pyrite (FeS)2) Has rich crust resource content, is green and environment-friendly, and has theoretical capacity as high as 894mAhg-1It is an ideal material for secondary batteries. However, this material undergoes volume expansion or pulverization during charging and discharging, which causes problems such as rapid capacity fading, etc., and its conductivity is poor, which in turn causes poor electrochemical performance of the sodium ion battery.
Aiming at the problems of the material, the FeS is adjusted2The morphology and structure of the material is critical to solving this problem. Currently researchers of sodium ion batteries will typically work on FeS2The material is nanocrystallized and compounded with other materials to synthesize FeS2A nanocomposite material. But the currently synthesized FeS2Nanocomposites are generally not sufficiently pureAnd the device performance stability is poor due to insufficient uniformity of size and morphology, and the existing preparation process usually uses expensive surfactant, complex precursor, toxic organic reagent or solvent, and the like, so that the process operation is complex, the yield is low, the cost is high, the large-scale production is not facilitated, and the environmental protection is also not facilitated. Thus developing low cost, good performance, environmentally friendly FeS2The synthesis method of the nano composite material has important significance for the commercialization of the sodium battery.
Disclosure of Invention
In order to solve the technical problems, the invention provides a hollow core-shell structure FeS2A preparation method and application of the @ C nanocomposite.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
hollow core-shell structure FeS2Preparation method of @ C nanocomposite material, and FeS with hollow core-shell structure2The raw materials for preparing the @ C nanocomposite comprise ferric trichloride, dipotassium hydrogen phosphate and urea, and the FeS with the hollow core-shell structure2The @ C nanocomposite was prepared by the following steps:
step (1): preparing ferric trichloride into ferric trichloride aqueous solution, then adding aqueous solution prepared from dipotassium hydrogen phosphate and urea into the ferric trichloride aqueous solution, then uniformly stirring the ferric trichloride aqueous solution and the aqueous solution prepared from the dipotassium hydrogen phosphate and the urea in a water bath, and finally transferring the mixture into a preheated oven for full reaction to obtain Fe2O3Nano-microspheres;
step (2): taking the Fe prepared in the step (1)2O3Adding a mixed solution of ethanol and water into the nano microspheres for full ultrasonic dispersion, then adding pyrrole, mixing and stirring uniformly at a constant speed, finally adding a hydrochloric acid solution, and after water bath ultrasonic reaction, alternately centrifugally cleaning with deionized water and ethanol to obtain hollow core-shell structure Fe2O3@ PPy composite microspheres.
And (3): taking the Fe prepared in the step (2)2O3Sample of @ PPy was vacuum dried to give Fe2O3@ PPy powder, then Fe2O3Putting the @ PPy powder into a combustion boat, and uniformly covering Fe with sulfur powder2O3The surface of the @ PPy powder was then partially covered with a glass plate on a combustion boat and then annealed, cooled to room temperature to obtain a black solid after the reaction was completed, and then CS was used2Washing the obtained black solid with the solution, then alternately centrifuging and washing with deionized water and ethanol to obtain a product, and finally drying the product in a vacuum drying oven to obtain the FeS with the hollow core-shell structure2The @ C nano composite microsphere is obtained to obtain the FeS with the hollow core-shell structure2@ C nanocomposite.
Further, the mass ratio of the ferric trichloride to the dipotassium hydrogen phosphate is 1: 2-1: 4, and the mass ratio of the ferric trichloride to the urea is 2: 1-7: 1.
Further, the water bath temperature is 25-40 ℃, the oven reaction temperature is 150-175 ℃, and the reaction time is 8-12 h.
Further, the ratio of ethanol to water in the step (3) is 1: 1-1: 8, and Fe2O3The mass of the nano microsphere is 10-100 mg, the dosage of the pyrrole is 10-500 mu L, the constant rotating speed is 300-800 r/min, the concentration of the hydrochloric acid is 6-12 mol/L, the volume ratio of the hydrochloric acid to the pyrrole is 6: 1-300: 1, and the reaction time is 60-120 min.
Further, Fe in the step (3)2O3The mass ratio of the @ PPy sample to the sulfur powder is 1: 5-1: 10, and the sulfur powder is ensured to be uniformly and completely covered on Fe2O3@ PPy powder.
Further, the annealing treatment in the step (3) adopts a calcining atmosphere for annealing, wherein the calcining atmosphere is nitrogen, the annealing temperature is 350-550 ℃, the annealing rate is 2-8 ℃/min, and the annealing time is 120-240 min.
Further, the CS is used for the black solid obtained in the step (3)2And washing the solution for multiple times to remove residual sulfur powder, washing the solution with deionized water and ethanol alternately to obtain a product, and drying the product in a vacuum drying oven at the temperature of 50-80 ℃ for 6-12 hours.
In order to achieve the purpose, the technical scheme adopted by the invention in another aspect is as follows:
the hollow core-shell structure FeS2@ C nanocomposite is prepared by the method, the hollow core-shell structure FeS2@ C nanocomposite takes Fe2O3 as a core material and polypyrrole as a coating layer, the hollow core-shell structure FeS2@ C nanocomposite forms hollow core-shell structure Fe2O3@ PPy composite microspheres by a hydrothermal method, and then high-purity hollow core-shell structure FeS2@ C composite microspheres can be obtained by a further vulcanization and calcination strategy.
In order to achieve the purpose, the technical scheme adopted by the invention in another aspect is as follows:
the application of the hollow core-shell structure FeS2@ C nanocomposite material is that the hollow core-shell structure FeS2@ C nanocomposite material is adopted, and the hollow core-shell structure FeS2The @ C nano composite microsphere powder is prepared into a lithium battery negative pole piece for electrochemical performance testing.
In one embodiment, the hollow core-shell structure FeS2@ C nano composite microspheres are ground into powder to be used as a working material, the powder is mixed and ground with conductive material carbon black and binder PVDF according to the mass ratio of 8:1:1, then dispersant N-methyl pyrrolidone (NMP) is added for pulping, the pulp is coated on copper foil, and then the pulp is dried in vacuum to obtain a sodium battery negative electrode piece, wherein a sodium piece is used as a positive electrode, the solute of electrolyte is 1M NaClO4, the solvent of the electrolyte is a mixed solution of Ethylene Carbonate (EC) and dimethyl carbonate (DMC), the volume ratio of the mixed solution is 1:1, and the sodium battery performance is evaluated.
Compared with the prior art, the invention has at least the following beneficial effects:
(1) the invention provides a two-step green synthesis strategy to obtain high-quality hollow core-shell structure FeS2The @ C nano composite microspheres are easy to obtain raw materials, simple and efficient to operate, greatly improve the production efficiency of materials, reduce the production energy consumption and facilitate large-scale production;
(2) the high-purity hollow core-shell structure FeS prepared by the invention2The @ C nano composite microsphere has the nano size effect and special structure, so that it can be used for charging and dischargingIn the process, FeS is avoided2The material expands in volume during charging and discharging, so that the cycle characteristic of the material is improved, and the electric conductivity of the whole composite material is improved by coating the polypyrrole material, so that the electrochemical performance of the polypyrrole material as a sodium ion battery is improved.
Drawings
FIG. 1 shows a FeS with a hollow core-shell structure obtained by the invention2Scanning electron microscope picture of @ C nanocomposite microsphere.
FIG. 2 shows a FeS with a hollow core-shell structure obtained by the present invention2Transmission electron microscopy images of @ C nanocomposite microspheres.
FIG. 3 shows a FeS with a hollow core-shell structure obtained by the present invention2X-ray diffraction pattern of @ C nanocomposite microspheres.
FIG. 4 shows a FeS with a hollow core-shell structure obtained by the present invention2Scanning electron microscope picture of @ C nanocomposite microsphere.
FIG. 5 shows a hollow core-shell structure FeS obtained by the present invention2Scanning electron microscope picture of @ C nanocomposite microsphere.
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the present invention, but are not intended to limit the present findings in any way. It should be noted that variations and modifications can be made by persons skilled in the art without departing from the spirit of the invention. All falling within the scope of the present invention.
Example one
Hollow core-shell structure FeS2Preparation method of @ C nanocomposite material, and FeS with hollow core-shell structure2The raw materials for preparing the @ C nanocomposite comprise ferric trichloride, dipotassium hydrogen phosphate and urea, and the FeS with the hollow core-shell structure2The @ C nanocomposite was prepared by the following steps:
step (1): 1.0g of ferric trichloride is added with 40ml of water to prepare ferric trichloride aqueous solution, then 2.4g of dipotassium hydrogen phosphate and 0.7g of urea are added, and then the ferric trichloride aqueous solution, 2.4g of dipotassium hydrogen phosphate and 0.7g of urea are stirred uniformly in a water bath at 25 DEG CHomogenizing, transferring to oven preheated to 170 deg.C, and reacting for 10 hr to obtain Fe2O3And (4) nano microspheres.
Step (2): taking prepared Fe2O3Adding 10mg of nano-microspheres into a mixed solution of 5ml of ethanol and 35ml of water, fully and ultrasonically dispersing for 30min, then adding 300 mu l of pyrrole, mixing and stirring uniformly at a constant speed of 600r/min, then adding 3ml of hydrochloric acid with the concentration of 10 mol/L, carrying out ultrasonic reaction for 90min in a water bath at 25 ℃, alternately centrifuging and cleaning for 3 times by using deionized water and ethanol, and thus obtaining the hollow core-shell structure Fe2O3@ PPy composite microspheres.
And (3): taking the prepared Fe2O3The sample of @ PPy was vacuum dried, then 1g of Fe was taken2O3The @ PPy powder is laid flat and put into a combustion boat, and 5g of sulfur powder is taken to be evenly and completely covered on Fe2O3The surface of the @ PPy powder was then partially covered with a glass plate on a combustion boat, and then annealed in a nitrogen atmosphere at a temperature rise rate of 5 ℃/min and an annealing temperature of 350 ℃ for 120min, cooled to room temperature after the reaction to obtain a black solid, and then CS was used2Washing the obtained black solid with the solution, alternately centrifuging and washing with deionized water and ethanol for 3 times, drying the product in a vacuum drying oven at 60 deg.C for 12h to obtain FeS with hollow core-shell structure shown in scanning electron microscope of FIG. 42@ C nanocomposite microsphere, Fe2O3The proportion of the nanospheres dispersed in the ethanol and water mixed solution and the amount of pyrrole used will affect the appearance and thickness of the product shell layer.
Example two
Hollow core-shell structure FeS2Preparation method of @ C nanocomposite material, and FeS with hollow core-shell structure2The raw materials for preparing the @ C nanocomposite comprise ferric trichloride, dipotassium hydrogen phosphate and urea, and the FeS with the hollow core-shell structure2The @ C nanocomposite was prepared by the following steps:
step (1): 1.0g of ferric trichloride is added with 40ml of water to prepare ferric trichloride aqueous solution, and then 2.4g of dipotassium hydrogen phosphate is addedAnd 0.7g of urea, then fully stirring the ferric trichloride aqueous solution, 2.4g of dipotassium hydrogen phosphate and 0.7g of urea in a water bath at 25 ℃ to be uniform, and finally transferring the mixture to a preheated oven at 170 ℃ to fully react for 10 hours to obtain Fe2O3And (4) nano microspheres.
Step (2): taking prepared Fe2O3Adding 10mg of nano-microspheres into a mixed solution of 20ml of ethanol and 20ml of water, fully and ultrasonically dispersing for 30min, then adding 300 mu l of pyrrole, mixing and stirring uniformly at a constant speed of 600r/min, then adding 6ml of hydrochloric acid with the concentration of 12 mol/L, carrying out ultrasonic reaction for 90min in a water bath at 25 ℃, and then alternately centrifuging and cleaning for 3 times by using deionized water and ethanol to obtain the hollow core-shell structure Fe2O3@ PPy composite microspheres.
And (3): taking the prepared Fe2O3The sample of @ PPy was vacuum dried, then 1g of Fe was taken2O3The @ PPy powder is laid flat and put into a combustion boat, and 5g of sulfur powder is taken to be evenly and completely covered on Fe2O3The surface of the @ PPy powder was then partially covered with a glass plate on a combustion boat, and then annealed in a nitrogen atmosphere at a temperature rise rate of 5 ℃/min and an annealing temperature of 550 ℃ for 120min, cooled to room temperature after the reaction to obtain a black solid, and then CS was used2Washing the obtained black solid with the solution, alternately centrifuging and washing with deionized water and ethanol for 3 times, drying the product in a vacuum drying oven at 60 deg.C for 12h to obtain FeS with hollow core-shell structure shown in scanning electron microscope of FIG. 52@ C nanocomposite microspheres, which exhibit partial damage to the carbon layer, which in turn can affect the performance of sodium batteries.
EXAMPLE III
Hollow core-shell structure FeS2The preparation method of the @ C nanocomposite is characterized by comprising the following steps: the hollow core-shell structure FeS2The raw materials for preparing the @ C nanocomposite comprise ferric trichloride, dipotassium hydrogen phosphate and urea, and the FeS with the hollow core-shell structure2The @ C nanocomposite was prepared by the following steps:
step (1): 1.0g of ferric chloride is taken and added into 40ml of water is prepared into ferric trichloride aqueous solution, then 2.4g of dipotassium hydrogen phosphate and 0.7g of urea are added, then the ferric trichloride aqueous solution, 2.4g of dipotassium hydrogen phosphate and 0.7g of urea are fully and uniformly stirred in a water bath at 25 ℃, and finally the mixture is transferred into an oven preheated to 150 ℃ to fully react for 12 hours, thus obtaining Fe2O3And (4) nano microspheres.
Step (2): taking prepared Fe2O3Adding 100mg of nano-microspheres into a mixed solution of 20ml of ethanol and 20ml of water, fully and ultrasonically dispersing for 30min, then adding 50 mu l of pyrrole, mixing and stirring uniformly at a constant speed of 600r/min, then adding 3ml of hydrochloric acid with the concentration of 10 mol/L, carrying out ultrasonic reaction for 90min in a water bath at 25 ℃, and then alternately centrifuging and cleaning for 3 times by using deionized water and ethanol to obtain the hollow core-shell structure Fe2O3@ PPy composite microspheres.
And (3): taking the prepared Fe2O3The sample of @ PPy was vacuum dried, then 1g of Fe was taken2O3The @ PPy powder is laid flat and put into a combustion boat, and then 10g of sulfur powder is taken to be evenly and completely covered on Fe2O3The surface of the @ PPy powder was then partially covered with a glass plate on a combustion boat, and then annealed in a nitrogen atmosphere at a temperature rise rate of 5 ℃/min and an annealing temperature of 350 ℃ for 120min, cooled to room temperature after the reaction to obtain a black solid, and then CS was used2Washing the obtained black solid with the solution, alternately centrifuging and washing for 3 times by using deionized water and ethanol, and drying the product in a vacuum drying oven at 60 ℃ for 12h to obtain the FeS with the hollow core-shell structure2@ C nanocomposite microspheres.
Example four
The hollow core-shell structure FeS2@ C nanocomposite is characterized in that Fe2O3 is used as a core material, polypyrrole is used as a coating layer, a hollow core-shell structure Fe2O3@ PPy composite microsphere is formed by a one-step hydrothermal method, and then a high-purity hollow core-shell structure FeS2@ C composite microsphere is obtained by a further vulcanization and calcination strategy.
EXAMPLE five
Hollow core shellStructure FeS2Preparation method and application of @ C nanocomposite material, and FeS with hollow core-shell structure2The raw materials for preparing the @ C nanocomposite comprise ferric trichloride, dipotassium hydrogen phosphate and urea, and the FeS with the hollow core-shell structure2The @ C nanocomposite was prepared by the following steps:
step (1): adding 1.0g of ferric trichloride into 40ml of water to prepare an iron trichloride aqueous solution, then adding 2.4g of dipotassium hydrogen phosphate and 0.7g of urea, then uniformly stirring the iron trichloride aqueous solution, 2.4g of dipotassium hydrogen phosphate and 0.7g of urea in a water bath at 25 ℃, finally transferring the mixture into an oven preheated to 170 ℃ for full reaction for 10 hours to obtain Fe2O3And (4) nano microspheres.
Step (2): taking prepared Fe2O3Adding 10mg of nano-microspheres into a mixed solution of 20ml of ethanol and 20ml of water, fully and ultrasonically dispersing for 30min, then adding 50 mu l of pyrrole, mixing and stirring uniformly at a constant speed of 600r/min, then adding 3ml of hydrochloric acid with the concentration of 10 mol/L, carrying out ultrasonic reaction for 90min in a water bath at 25 ℃, alternately centrifuging and cleaning for 3 times by using deionized water and ethanol, and thus obtaining the hollow core-shell structure Fe2O3@ PPy composite microspheres.
And (3): taking the prepared Fe2O3The sample of @ PPy was vacuum dried, then 1g of Fe was taken2O3The @ PPy powder is laid flat and put into a combustion boat, and 5g of sulfur powder is taken to be evenly and completely covered on Fe2O3The surface of the @ PPy powder was then partially covered with a glass plate on a combustion boat, and then annealed in a nitrogen atmosphere at a heating rate of 5 ℃/min and an annealing temperature of 350 ℃ for 120min, cooled to room temperature after the reaction was completed to obtain a black solid, and then CS was used2Washing the obtained black solid with the solution, alternately centrifuging and washing with deionized water and ethanol for 3 times, drying the product in a vacuum drying oven at 60 deg.C for 12h to obtain hollow core-shell structure FeS shown in figure 1 by scanning electron microscope2The corresponding transmission electron microscope of the @ C nano composite microsphere is shown in figure 2, an obvious hollow core-shell structure can be seen in the figure, the XRD representation is carried out on the @ C nano composite microsphere,the FeS obtained, as shown in FIG. 32The @ C nano composite microsphere has high purity and no impurities.
And (4): taking the hollow core-shell structure FeS prepared by the above method250mg of @ C nano composite microsphere powder as a working material, a conductive material carbon black and a binder PVDF in a mass ratio of 8:1:1 for mixing and grinding, then adding a dispersant N-methyl pyrrolidone (NMP) for pulping, coating the pulp on a copper foil, drying in vacuum to obtain a sodium battery negative electrode piece, taking a sodium piece as a positive electrode, and taking 1M NaClO as an electrolyte solute4The electrolyte solvent was a mixed solution of Ethylene Carbonate (EC) and dimethyl carbonate (DMC) at a volume ratio of 1:1, and the sodium battery performance was evaluated. I.e. a hollow core-shell structure FeS2The @ C nano composite microsphere as the battery cathode material has high first charge-discharge specific capacities of 539.7mAhg < -1 > and 510.2mAhg < -1 >, and the first charge-discharge specific capacity is 100mA g-1After 300 cycles under the current density, the capacity retention rate can reach 87 percent, and under the coating of a carbon layer, the design of a hollow core-shell structure ensures that FeS has high performance2The @ C nanocomposite exhibited better than simple FeS2Better cycle performance.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention in any way, and any person skilled in the art can make any simple modification, equivalent replacement, and improvement on the above embodiment without departing from the technical spirit of the present invention, and still fall within the protection scope of the technical solution of the present invention.
Claims (10)
1. Hollow core-shell structure FeS2The preparation method of the @ C nanocomposite is characterized by comprising the following steps: the hollow core-shell structure FeS2The raw materials for preparing the @ C nanocomposite comprise ferric trichloride, dipotassium hydrogen phosphate and urea, and the FeS with the hollow core-shell structure2The @ C nanocomposite was prepared by the following steps:
step (1): preparing ferric trichloride into ferric trichloride aqueous solution, then adding aqueous solution prepared from dipotassium hydrogen phosphate and urea into the ferric trichloride aqueous solution, and then mixing the ferric trichloride aqueous solution with the dipotassium hydrogen phosphate and the ureaThe water solution prepared by urea is evenly stirred in water bath and finally transferred to a preheated oven for full reaction, thus obtaining Fe2O3Nano-microspheres;
step (2): taking the Fe prepared in the step (1)2O3Adding a mixed solution of ethanol and water into the nano microspheres for full ultrasonic dispersion, then adding pyrrole, mixing and stirring uniformly at a constant speed, finally adding a hydrochloric acid solution, and after water bath ultrasonic reaction, alternately centrifugally cleaning with deionized water and ethanol to obtain hollow core-shell structure Fe2O3@ PPy composite microspheres;
and (3): taking the Fe prepared in the step (2)2O3Sample of @ PPy was vacuum dried to give Fe2O3@ PPy powder, then Fe2O3Putting the @ PPy powder into a combustion boat, and uniformly covering Fe with sulfur powder2O3The surface of the @ PPy powder was then partially covered with a glass plate on a combustion boat and then annealed, cooled to room temperature to obtain a black solid after the reaction was completed, and then CS was used2Washing the obtained black solid with the solution, then alternately centrifuging and washing with deionized water and ethanol to obtain a product, and finally drying the product in a vacuum drying oven to obtain the FeS with the hollow core-shell structure2The @ C nano composite microsphere is obtained to obtain the FeS with the hollow core-shell structure2@ C nanocomposite.
2. The FeS with hollow core-shell structure according to claim 12The preparation method of the @ C nanocomposite is characterized in that the mass ratio of ferric trichloride to dipotassium hydrogen phosphate is 1: 2-1: 4, and the mass ratio of ferric trichloride to urea is 2: 1-7: 1, wherein the water solution of ferric trichloride is 0.02-0.1 mol/L.
3. The preparation method of the hollow core-shell structure FeS2@ C nanocomposite material according to claim 1, characterized in that: the water bath temperature is 25-40 ℃, the oven reaction temperature is 150-175 ℃, and the reaction time is 8-12 h.
4. The FeS with hollow core-shell structure according to claim 12The preparation method of the @ C nanocomposite is characterized by comprising the following steps: the proportion of ethanol and water in the step (3) is 1: 1-1: 8, and Fe2O3The mass of the nano microsphere is 10-100 mg, the dosage of the pyrrole is 10-500 mu L, the constant rotating speed is 300-800 r/min, the concentration of the hydrochloric acid is 6-12 mol/L, the volume ratio of the hydrochloric acid to the pyrrole is 6: 1-300: 1, and the reaction time is 60-120 min.
5. The FeS with hollow core-shell structure according to claim 12The preparation method of the @ C nanocomposite is characterized by comprising the following steps: fe in the step (3)2O3The mass ratio of the @ PPy sample to the sulfur powder is 1: 5-1: 10, and the sulfur powder is ensured to be uniformly and completely covered on Fe2O3@ PPy powder.
6. The FeS with hollow core-shell structure according to claim 12The preparation method of the @ C nanocomposite is characterized by comprising the following steps: and (3) annealing in a calcining atmosphere, wherein the calcining atmosphere is nitrogen, the annealing temperature is 350-550 ℃, the annealing rate is 2-8 ℃/min, and the annealing time is 120-240 min.
7. The FeS with hollow core-shell structure according to claim 12The preparation method of the @ C nanocomposite is characterized by comprising the following steps: CS for the black solid obtained in the step (3)2And washing the solution for multiple times to remove residual sulfur powder, washing the solution with deionized water and ethanol alternately to obtain a product, and drying the product in a vacuum drying oven at the temperature of 50-80 ℃ for 6-12 hours.
8. A hollow core-shell structure FeS2@ C nanocomposite, which is prepared by the method for preparing the hollow core-shell structure FeS2@ C nanocomposite according to any one of claims 1 to 7, and is characterized in that: the hollow core-shell structure FeS2@ C nanocomposite takes Fe2O3 as a core material and polypyrrole as a coating layer, a hydrothermal method is further adopted to form the hollow core-shell structure Fe2O3@ PPy composite microsphere, and then a further vulcanization and calcination strategy is adopted to obtain the high-purity hollow core-shell structure FeS2@ C composite microsphere.
9. The application of the hollow core-shell structure FeS2@ C nanocomposite material is characterized in that the hollow core-shell structure FeS2@ C nanocomposite material is adopted in the claim 8, and the application is as follows: the hollow core-shell structure FeS2The @ C nano composite microsphere powder is prepared into a lithium battery negative pole piece for electrochemical performance testing.
10. The application of the FeS2@ C nanocomposite material with the hollow core-shell structure as claimed in claim 9, wherein: grinding the FeS2@ C nano composite microspheres with the hollow core-shell structure into powder as a working material, mixing and grinding the powder with conductive material carbon black and binder PVDF according to the mass ratio of 8:1:1, adding dispersant N-methyl pyrrolidone (NMP) for pulping, coating the pulp on copper foil, and then drying in vacuum to obtain a sodium battery negative electrode plate, wherein a sodium plate is used as a positive electrode, the electrolyte solute is 1MNaClO4, the electrolyte solvent is a mixed solution of Ethylene Carbonate (EC) and dimethyl carbonate (DMC), the volume ratio is 1:1, and the sodium battery performance is evaluated.
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