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Metal-doped vanadium-based oxide nano material as well as preparation method and application thereof

A nano-material and metal doping technology, applied in vanadium oxide, electrochemical generators, structural parts, etc., can solve the problem of low rate performance battery life, achieve good rate performance, shorten ion diffusion path, and enhance kinetics Effects on performance and cycle stability

Pending Publication Date: 2022-02-15
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, the existing cathode materials have low rate performance and battery life when used

Method used

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  • Metal-doped vanadium-based oxide nano material as well as preparation method and application thereof
  • Metal-doped vanadium-based oxide nano material as well as preparation method and application thereof
  • Metal-doped vanadium-based oxide nano material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Example 1: Mg 0.02 V 5 o 12 Preparation of Cathode Active Material for Aqueous Zinc-ion Batteries

[0052] Will be commercial V 2 o 5 and oxalic acid were dissolved in deionized water at a molar ratio of 1:3 to obtain a precursor solution A with a concentration of 0.33 mol / L. Then magnesium acetate (Mg:V molar ratio of 1:50) was added to precursor solution A to obtain precursor solution B containing magnesium ions. Take 1.2 mL of precursor solution B and add it into a high-pressure digestion tank filled with 20 mL of isopropanol, and react at 200 °C for 2 h. The obtained product was placed in a tube furnace, and annealed at 1 °C / min to 250 °C for 2 h in an air atmosphere to obtain Mg 0.02 V 5 o 12 Porous nanosphere structure, whose FESEM as figure 1 As shown, XRD as figure 2 shown. Its nitrogen adsorption-desorption curve is as follows image 3 As shown, the BET specific surface area is 39.83m 2 / g.

Embodiment 2

[0053] Example 2: Mg 0.01 V 5 o 12 Preparation of Cathode Active Material for Aqueous Zinc-ion Batteries

[0054] Will be commercial V 2 o 5 and oxalic acid were dissolved in deionized water at a molar ratio of 1:3 to obtain a precursor solution A with a concentration of 0.33 mol / L. Then magnesium acetate was added to the precursor solution A (the molar ratio of Mg:V was 1:100) to obtain the precursor solution B containing magnesium ions. Take 2.4 mL of precursor solution B and add it into a high-pressure digestion tank filled with 50 mL of isopropanol solvent, and react at 200 °C for 2 h. The obtained product was placed in a tube furnace, and annealed at 1 °C / min to 250 °C for 2 h in an air atmosphere to obtain Mg 0.01 V 5 o 12 Porous nanosphere structure.

Embodiment 3

[0055] Example 3: Co 0.006 V 5 o 12 Preparation of Cathode Active Material for Aqueous Zinc-ion Batteries

[0056] Will be commercial V 2 o 5 and oxalic acid were dissolved in deionized water at a molar ratio of 1:2 to obtain a precursor solution A with a concentration of 0.5 mol / L. Then cobalt acetate (the molar ratio of Co:V is 1:150) was added to precursor solution A to obtain precursor solution B containing cobalt ions. Take 1.2 mL of precursor solution B and add it into a high-pressure digestion tank filled with 20 mL of isopropanol solvent, and react at 200 °C for 2.5 h. The obtained product was placed in a tube furnace, and annealed at 1 °C / min to 250 °C for 2 h in an air atmosphere to obtain Co 0.006 V 5 o 12 Porous nanosphere structure, whose FESEM as Figure 4 shown.

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Abstract

The invention belongs to the field of electrochemical energy storage electrode materials, and particularly relates to a metal-doped vanadium-based oxide nano material and a preparation method and application thereof. The chemical formula of the nano material is MxV5O12, where M is any one of magnesium, manganese, cobalt and nickel, and x is more than or equal to 0.005 and less than or equal to 0.03. The metal-doped vanadium-based oxide provided by the invention has a porous nanosphere structure and a relatively large specific surface area, and can provide more active sites to promote full contact between an active substance and an electrolyte. And the nanostructure is beneficial to shortening an ion diffusion path, buffering deformation generated in a zinc ion intercalation and deintercalation process, ensuring efficient mass transfer and ion transmission, and enhancing the dynamic performance and cycling stability of the material.

Description

technical field [0001] The invention belongs to the field of electrochemical energy storage electrode materials, and in particular relates to a metal-doped vanadium-based oxide nanomaterial and its preparation method and application. Background technique [0002] People have put forward higher requirements for energy storage technology, and expect energy storage equipment to develop in the direction of high energy density, high power density, low cost, and environmental protection and safety. Due to the shortage of lithium resources and safety issues such as the use of organic electrolytes in commercial lithium-ion batteries, the society urgently needs to develop products that can replace lithium-ion batteries. [0003] Aqueous zinc-ion batteries (ZIBs) are rich in zinc resources, and the batteries are safe and low cost, showing good application prospects. Vanadium-based materials have an open framework V 2 o 5 , which is commonly used as the positive electrode material f...

Claims

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Application Information

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IPC IPC(8): H01M4/48H01M4/131H01M10/054C01G31/02
CPCH01M4/48H01M4/131H01M10/054C01G31/02C01P2004/32C01P2004/62C01P2006/12C01P2006/40Y02E60/10
Inventor 于乐王际东李念武郭晶杰
Owner BEIJING UNIV OF CHEM TECH
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