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Phosphorus-doped vanadium pentoxide/vanadium heptaoxide porous nanofiber as well as preparation method and application thereof

A technology of vanadium pentoxide and vanadium heptaoxide, applied in the field of electrochemical energy storage, can solve the problems of poor rate performance, unfavorable commercial development, small specific capacity, etc., achieve good rate performance, improve cycle stability, increase The effect of conductivity

Active Publication Date: 2021-08-24
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to solve the present compound V 2 o 5 When the material is used as an electrode material for a zinc ion battery, the specific capacity at a small current density is small, the rate performance is poor, and it is not conducive to the shortcomings of commercial development, and a phosphorus-doped vanadium pentoxide / heptoxide Three vanadium porous nanofibers and its preparation method and application

Method used

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  • Phosphorus-doped vanadium pentoxide/vanadium heptaoxide porous nanofiber as well as preparation method and application thereof
  • Phosphorus-doped vanadium pentoxide/vanadium heptaoxide porous nanofiber as well as preparation method and application thereof
  • Phosphorus-doped vanadium pentoxide/vanadium heptaoxide porous nanofiber as well as preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0034] A method for preparing high-performance phosphorus-doped vanadium pentoxide / vanadium heptoxide porous nanofibers, comprising the following steps:

[0035] 1) Weigh 1 g of vanadyl acetylacetonate and 2 g of polyvinyl pyrrolidone and dissolve them in 9.49 g of N-N dimethylformamide solvent, and stir at room temperature for 12 hours.

[0036] 2) Weigh 0.0259 g of phosphoric acid and dissolve it in step 1) and continue to stir the solution for 12 hours until the mixture is evenly mixed to obtain the electrospinning precursor solution.

[0037]3) The electrospinning precursor solution was added into the syringe needle, and the electrospinning was performed at a voltage of 13kV, a distance between the needle and the roller of 13cm, and a bolus injection speed of 0.8mL / h to obtain a spinning product.

[0038] 4) Calcining the electrospun product obtained in step 3) at 200°C for 2 hours in an air atmosphere to obtain phosphorus-doped V 2 o 5 / V 3 o 7 Porous nanofibers, name...

Embodiment 2

[0047] A method for preparing high-performance phosphorus-doped vanadium pentoxide / vanadium heptoxide porous nanofibers, comprising the following steps:

[0048] 1) Weigh 1 g of vanadyl acetylacetonate and 3 g of polyvinyl pyrrolidone and dissolve them in 18.98 g of N-N dimethylformamide solvent, and stir at room temperature for 10 h.

[0049] 2) Weigh 0.0518 g of phosphoric acid and dissolve it in step 1) and continue to stir the solution for 10 h until the mixture is uniform to obtain the electrospinning precursor solution.

[0050] 3) Add the electrospinning precursor solution into the syringe needle, and perform electrospinning at a voltage of 14kV, a distance between the needle and the roller of 14cm, and a bolus injection speed of 0.9mL / h.

[0051] 4) Calcining the electrospun product obtained in step 3) at 300°C for 3 hours in an air atmosphere to obtain phosphorus-doped V 2 o 5 / V 3 o 7 Porous nanofibers, namely PVO porous nanofibers.

[0052] In order to verify t...

Embodiment 3

[0055] A method for preparing high-performance phosphorus-doped vanadium pentoxide / vanadium heptoxide porous nanofibers, comprising the following steps:

[0056] 1) Dissolve 1 g of vanadyl acetylacetonate and 3 g of polyvinylpyrrolidone in 28.47 mL of N-N dimethylformamide solvent, respectively, and stir at room temperature for 8 h.

[0057] 2) Weigh 0.0777g of phosphoric acid and dissolve it in step 1), and continue to stir the solution for 8 hours until the mixture is uniform, so as to obtain the electrospinning precursor solution.

[0058] 3) Add the electrospinning precursor solution into the syringe needle, and perform electrospinning at a voltage of 15kV, a distance between the needle and the roller of 15cm, and a bolus injection speed of 1mL / h to obtain a spinning product.

[0059] 4) Calcining the electrospun product obtained in step 3) at 400°C for 4 hours in an air atmosphere to obtain phosphorus-doped V 2 o 5 / V 3 o 7 Porous nanofibers, namely PVO porous nanofib...

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Abstract

The invention discloses a phosphorus-doped vanadium pentoxide / vanadium heptaoxide porous nanofiber as well as a preparation method and application thereof. The porous nanofiber is synthesized in one step through a simple electrostatic spinning method, a battery is assembled after calcination, and the electrochemical performance of the phosphorus-doped vanadium pentoxide / vanadium heptaoxide porous nanofiber serving as a positive electrode material of a zinc ion battery is tested. Phosphorus doping can change electron distribution around vanadium-oxygen bonds, so that the conductivity is improved. The vanadium pentoxide / vanadium heptaoxide composite material can enhance the stability of the structure and the porous nanofibers can increase the contact specific surface area of the electrode material and electrolyte. By controlling the proportion of phosphoric acid to vanadyl acetylacetonate, the phosphorus-doped vanadium pentoxide / vanadium heptaoxide porous nanofiber materials with different electrochemical properties can be obtained. Compared with a disclosed zinc ion battery electrode material, phosphoric acid is used as a phosphorus source for the first time and is doped with a vanadium pentoxide / vanadium heptaoxide composite material for modification, a porous fiber structure is constructed, and reference is provided for preparation of other zinc ion battery electrode materials.

Description

technical field [0001] The invention belongs to the technical field of electrochemical energy storage, and specifically relates to phosphorus-doped vanadium pentoxide / vanadium heptoxide porous nanofibers and a preparation method and application thereof. Background technique [0002] In recent years, great progress has been made in the development of new energy technologies, especially rechargeable batteries. At present, lithium-ion batteries are widely used in commercial energy storage devices due to their high energy transmission efficiency, high voltage, and long cycle life. However, many problems such as high cost and safety seriously hinder large-scale applications. Aqueous zinc-ion batteries have broad application prospects due to their high electrical conductivity, abundant zinc metal resources, high chemical and physical stability, environmental friendliness, and high safety. [0003] At present, the electrode materials of aqueous zinc-ion batteries mainly include ma...

Claims

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Application Information

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IPC IPC(8): H01M4/48H01M10/36B82Y30/00D01D5/00
CPCH01M4/48H01M10/36B82Y30/00D01D5/003H01M2004/028H01M2004/021Y02E60/10
Inventor 王维佳樊慧庆冯成薛雨佳
Owner NORTHWESTERN POLYTECHNICAL UNIV
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