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CN-116544037-B - V (V)2O3/C@FexMnyOzNegative electrode composite material, preparation method and application thereof

CN116544037BCN 116544037 BCN116544037 BCN 116544037BCN-116544037-B

Abstract

The invention provides a V 2 O 3 /C@Fe x Mn y O z negative electrode composite material, a preparation method and application thereof, and belongs to the technical field of negative electrode material preparation and supercapacitors, wherein the V 2 O 3 /C@Fe x Mn y O z negative electrode composite material is of a block structure wrapped by countless small particle balls, the V 2 O 3 /C@Fe x Mn y O z negative electrode composite material has a more mesoporous structure, the average pore diameter is 5.2-5.7 nm, the x: y: z=8.25:2.76:21.22, and the V 2 O 3 /C@Fe x Mn y O z electrode material has the advantages of good mass specific capacitance, large specific surface area, good cycling stability, small ion diffusion impedance, rich active sites and the like, and has good application in serving as the supercapacitor negative electrode material.

Inventors

  • ZHAO QIAN
  • LIU LEI

Assignees

  • 江苏大学

Dates

Publication Date
20260512
Application Date
20230331

Claims (9)

  1. 1. The V 2 O 3 /C@Fe x Mn y O z negative electrode composite material is characterized in that the V 2 O 3 /C@Fe x Mn y O z negative electrode composite material is of a block structure wrapped by countless small particle balls, the V 2 O 3 /C@Fe x Mn y O z negative electrode composite material is of a mesoporous structure, the average pore diameter is 5.2-5.7 nm, and the x is y: z=8.25:2.76:21.22.
  2. 2. The method for preparing the V 2 O 3 /C@Fe x Mn y O z anode composite material according to claim 1, comprising: (1) Preparation of precursor V 2 O 3 /C: Uniformly stirring ammonium metavanadate and active carbon powder, and calcining at a high temperature to obtain a precursor V 2 O 3 /C; (2) Preparation of V 2 O 3 /C@FeMn-LDH: Dispersing V 2 O 3 /C in water uniformly, recording as solution 1, dissolving ferric nitrate nonahydrate and manganese acetate tetrahydrate in water, stirring thoroughly to dissolve, recording as solution 2, dissolving urea in water, stirring thoroughly to dissolve, recording as solution 3; Adding the solution 1 into the solution 2, stirring until the mixture is uniform, adding the solution 3 into the mixture, stirring the mixture uniformly to obtain a mixed solution, carrying out hydrothermal reaction on the mixed solution, and centrifuging, washing and drying the mixed solution after the reaction is finished to obtain V 2 O 3 /C@FeMn-LDH; (3) Preparation of V 2 O 3 /C@Fe x Mn y O z cathode composite material: And oxidizing the V 2 O 3 /C@FeMn-LDH at a low temperature of 280-320 ℃ for 100-150 min, and then obtaining the V 2 O 3 /C@Fe x Mn y O z anode composite material, wherein x is y and z=8.25:2.76:21.22.
  3. 3. The method for preparing a V 2 O 3 /C@Fe x Mn y O z negative electrode composite material according to claim 2, wherein in the step (1), the mass ratio of the ammonium metavanadate to the activated carbon powder is 4:1-3:1.
  4. 4. The method for preparing a V 2 O 3 /C@Fe x Mn y O z negative electrode composite material according to claim 2, wherein in the step (1), the high-temperature calcination condition is calcination at 750-850 ℃ for 100-150 min.
  5. 5. The method for preparing the V 2 O 3 /C@Fe x Mn y O z negative electrode composite material according to claim 2, wherein in the step (2), the mass ratio of V 2 O 3 /C, ferric nitrate nonahydrate, manganese acetate tetrahydrate and urea is 60-80 mg:400-450 mg:240-260 mg:180-240 mg.
  6. 6. The method for preparing a V 2 O 3 /C@Fe x Mn y O z negative electrode composite material according to claim 2, wherein in the step (2), the hydrothermal reaction condition is that the hydrothermal reaction is carried out for 9-11 hours at 120-140 ℃.
  7. 7. Use of the V 2 O 3 /C@Fe x Mn y O z negative electrode composite material of claim 1 as a supercapacitor negative electrode material.
  8. 8. The use according to claim 7, characterized in that the use is: Soaking the two pieces of foam nickel in hydrochloric acid, washing and drying after the soaking is finished to obtain treated foam nickel; and (3) mixing V 2 O 3 /C@Fe x Mn y O z , acetylene black, PTFE and ethanol to obtain a mixed solution, performing ultrasonic dispersion, then dripping the uniformly dispersed mixed solution onto two pieces of treated foam nickel, performing vacuum drying, and then pressing the foam nickel into a sheet by using a tablet press to obtain the negative electrode V 2 O 3 /C@Fe x Mn y O z .
  9. 9. The use according to claim 8, characterized in that the concentration of the hydrochloric acid is 2-4 mol/L; the mass ratio of V 2 O 3 /C@Fe x Mn y O z , acetylene black and PTFE is 7.5-8.5:0.9-1.1:0.9-1.1.

Description

V 2O3/C@FexMnyOz negative electrode composite material and preparation method and application thereof Technical Field The invention belongs to the technical field of preparation of negative electrode materials and supercapacitors, and particularly relates to a V 2O3/C@FexMnyOz negative electrode composite material, a preparation method and application thereof. Background With the rapid development of technology, the contradiction between energy problems and environmental pollution is gradually revealed due to the aggravation of urbanization and industrialization. In order to gradually reduce the dependence on traditional non-renewable resources, the development of renewable clean energy which promotes environmental protection is an important problem which is urgently needed to be solved in the industry at present. The super capacitor is used as an emerging energy storage device, has the advantages of high energy density, excellent power density, good circulation stability, quick charge and quick discharge and the like, and has good development potential and application value in the aspects of rail transit, communication, smart grids, electrical sensors, medical equipment and the like. Super capacitor is a substitute of traditional battery with great development prospect. Supercapacitors offer advantages over conventional batteries in terms of some electrochemical properties, such as charge-discharge rate, cycle life, power density, etc. Most of the current supercapacitor negative electrode materials are activated carbon, but the electrochemical performance of the activated carbon electrode is not ideal, so that the development of the asymmetric supercapacitor is limited to a certain extent. The iron oxide is a cathode active material with low cost and large theoretical capacitance. As with other metal oxides, its conductivity and dispersibility are also poor, so improving the conductivity and dispersibility of iron oxides is a critical issue to be addressed. Accordingly, it is desirable to provide a supercapacitor anode material capable of improving the conductivity and dispersibility of iron oxides. Disclosure of Invention Aiming at the defects in the prior art, the invention provides a V 2O3/C@FexMnyOz negative electrode composite material, a preparation method and application thereof, wherein the V 2O3/C@FexMnyOz negative electrode composite material is of a block structure wrapped by countless small particle balls, the V 2O3/C@FexMnyOz negative electrode composite material has a more mesoporous structure and an average pore diameter of 5.2-5.7 nm, and the V 2O3/C@FexMnyOz electrode material has the advantages of good mass specific capacitance, large specific surface area, good cycling stability, small ion diffusion impedance, rich active sites and the like, and has good application in serving as a supercapacitor negative electrode material. The invention firstly provides a V 2O3/C@FexMnyOz negative electrode composite material, wherein the V 2O3/C@FexMnyOz negative electrode composite material is of a block structure wrapped by countless small particle balls, the V 2O3/C@FexMnyOz negative electrode composite material is of a mesoporous structure, the average pore diameter is 5.2-5.7 nm, and the x is y:z=8.25:2.76:21.22. The invention also provides a preparation method of the V 2O3/C@FexMnyOz negative electrode composite material, which specifically comprises the following steps: (1) Preparation of precursor V 2O3/C: Uniformly stirring ammonium metavanadate and active carbon powder, and calcining at a high temperature to obtain a precursor V 2O3/C; (2) Preparation of V 2O3/C@FeMn-LDH: Dispersing V 2O3/C in water uniformly, recording as solution 1, dissolving ferric nitrate nonahydrate and manganese acetate tetrahydrate in water, stirring thoroughly to dissolve, recording as solution 2, dissolving urea in water, stirring thoroughly to dissolve, recording as solution 3; Adding the solution 1 into the solution 2, stirring until the mixture is uniform, adding the solution 3 into the mixture, stirring the mixture uniformly to obtain a mixed solution, carrying out hydrothermal reaction on the mixed solution, and centrifuging, washing and drying the mixed solution after the reaction is finished to obtain V 2O3/C@FeMn-LDH; (3) Preparation of V 2O3/C@FexMnyOz cathode composite material: And oxidizing the V 2O3/C@FeMn-LDH at a low temperature of 280-320 ℃ for 100-150 min, and then obtaining the V 2O3/C@FexMnyOz anode composite material, wherein x is y and z=8.25:2.76:21.22. Preferably, in the step (1), the mass ratio of the ammonium metavanadate to the activated carbon powder is 4:1-3:1. Preferably, in the step (1), the high-temperature calcination condition is calcination at 750-850 ℃ for 100-150 min. Preferably, in the step (2), the mass ratio of V 2O3/C, ferric nitrate nonahydrate, manganese acetate tetrahydrate and urea is 60-80 mg:400-450 mg:240-260 mg:180-240 mg. Preferably, in the step (2), the hydrothermal