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Vanadate electrode material as well as preparation method and application thereof

An electrode material and vanadate technology, applied in the field of electrochemistry, can solve the problems that the interlayer spacing is difficult to meet the free movement of sodium ions, the material cannot be fully redox reaction, and the sodium storage capacity cannot be fully released, etc., and achieve stable charge-discharge cycles. performance, good electrical conductivity and structural stability, the effect of improving the discharge specific capacity

Active Publication Date: 2021-04-16
GUANGDONG UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] For sodium-ion batteries, vanadium-oxygen polyhedrons of vanadium oxides are connected by weak van der Waals force, and the layer spacing is difficult to satisfy the free movement of sodium ions with larger radii, so it will occur during the deintercalation of sodium ions. The phase change of the internal structure of the material, the capacity decays rapidly
The vanadium-based material itself also has the disadvantage of poor conductivity. During the charging and discharging process, the material cannot fully carry out the oxidation-reduction reaction due to the slow transmission rate of electron ions on the surface and inside of the material, which makes the sodium storage capacity of the material Unable to fully release, low specific capacity

Method used

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  • Vanadate electrode material as well as preparation method and application thereof
  • Vanadate electrode material as well as preparation method and application thereof
  • Vanadate electrode material as well as preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0045] (1) Dissolve 4mmol sodium orthovanadate in 80mL water to obtain a sodium vanadate solution with a vanadate ion concentration of 0.05mol / L, add acetic acid dropwise to adjust the pH of the solution to 2.0, and carry out prepolymerization at 80°C for 60 Minutes to form polyvanadate ion groups;

[0046] (2) Add 4mmol of calcium chloride hydrate and stir to dissolve fully, carry out hydrothermal reaction in a high-temperature reactor at 220°C for 24 hours, after the reaction is completed, after the reaction is completed, after alternating centrifugal ultrasonic washing with water and alcohol, dry at 70°C to obtain nanobelts Calcium vanadate with structure;

[0047] (3) Disperse 0.1g of calcium vanadate obtained in step (2) and 0.1g of melamine monomer in 100mL of deionized water, stir until a uniform suspension is formed, and then add 1mL of formaldehyde solution (37-40 wt% ) and 0.2mL of acetic acid (analytically pure), polymerized at 50°C for 12 hours. After the reaction...

Embodiment 2

[0049] Example 2: The difference from Example 1 is that 6 mmol of sodium citrate is added while adding calcium chloride hydrate in step (2), and the rest of the implementation steps and process conditions are the same, and finally carbon-coated nanosheets are obtained calcium vanadate electrode material.

Embodiment 3

[0051] (1) Dissolve 1.6mmol sodium orthovanadate in 80mL water to obtain a sodium vanadate solution with a vanadate ion concentration of 0.02mol / L, add acetic acid dropwise to adjust the pH of the solution to 3.0, and perform prepolymerization at 60°C 30 minutes to form polyvanadate ion groups;

[0052] (2) Add 3.2mmol of barium chloride hydrate and fully stir to dissolve, carry out hydrothermal reaction in a high-temperature reactor at 250°C for 12 hours. After the reaction, after the reaction is completed, it is washed with water and alcohol alternately, centrifugally and ultrasonically, and dried at 70°C to obtain nano Barium vanadate with ribbon structure;

[0053] (3) Disperse 0.1 g of barium vanadate obtained in step (2) and 0.1 g of resorcinol monomer in 100 mL of deionized water, stir until a uniform suspension is formed, then add 1 mL of formaldehyde solution (37-40 wt%) and 0.2mL of ammonia water (25-28wt%), polymerized at 30°C for 18 hours, after the reaction, afte...

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Abstract

The invention discloses a vanadate electrode material as well as a preparation method and application thereof, the vanadate electrode material has a layered crystal structure taking divalent metal ions as pre-intercalation ions, and the surface of the material is coated with a layer of amorphous carbon, so that the material has relatively large interlayer spacing, very good conductivity and structural stability; the vanadate electrode material can meet the diffusion and migration of sodium ions with larger radius in the material, the rapid transmission of ions and electrons and the full proceeding of oxidation-reduction reaction in the charging and discharging process of the material can be realized, the vanadate electrode material is particularly suitable for being used as a negative electrode material of a sodium ion battery, and has stable cycle performance and higher specific discharge capacity. The preparation method of the vanadate electrode material provided by the invention is simple in process, easily available in raw materials, green and environment-friendly, and accords with the chemical concept of sustainable development.

Description

technical field [0001] The invention relates to the field of electrochemistry, in particular to a vanadate electrode material and a preparation method and application thereof. Background technique [0002] The exploration in the energy field has always been carried out around resources and environmental protection. The rapid development and wide application of lithium-ion batteries in recent years has greatly eased the pressure on resources and the environment compared with fossil energy. But at the same time, new energy problems have also been triggered. The output of lithium-ion batteries as a source of electricity for mobile devices, power vehicles and other industries has increased year by year. The huge demand for electricity in large-scale power grids poses new challenges to limited lithium resources. The sodium-ion battery has a similar energy storage mechanism to the lithium-ion battery, and has advantages over lithium-ion batteries in some aspects: (1) the cost of s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/485H01M4/62H01M10/054C01G31/00C01B32/05B82Y40/00B82Y30/00
CPCY02E60/10
Inventor 唐玉蝶张海燕黄海涛张尚尚
Owner GUANGDONG UNIV OF TECH
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