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Porous CoV2O6 nanosheet electrode material and preparation method and application thereof

An electrode material and nanosheet technology, applied in the field of nanomaterials and electrochemistry, can solve the problems of volume expansion, low electronic conductivity of cobalt oxide, and destroy cycle performance, and achieve easy amplification, excellent cycle stability, and improved The effect of ionic conductivity

Active Publication Date: 2015-12-09
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the electronic conductivity of cobalt oxide is not high, and its volume will expand a lot during the charge and discharge process, resulting in destruction and poor cycle performance, which limits its application.

Method used

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  • Porous CoV2O6 nanosheet electrode material and preparation method and application thereof
  • Porous CoV2O6 nanosheet electrode material and preparation method and application thereof
  • Porous CoV2O6 nanosheet electrode material and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Mesoporous CoV 2 o 6 The preparation method of nano sheet, it comprises the steps:

[0028] 1) First add 0.08g of acetylene black to 20ml of water and stir, then add 0.9963g of cobalt acetate and stir for 2 hours, so that the acetylene black can be completely immersed in water;

[0029] 2) Add 0.9385g of ammonium metavanadate to 20mL of deionized water, dissolve in a water bath at 85°C, add the resulting solution dropwise to the solution obtained in step 1), and stir together for 5 hours at room temperature to obtain a precursor;

[0030] 3) Dry the obtained precursor in a water bath at 85°C, and after grinding, calcinate at 450°C for 10 hours in air to obtain a yellow porous CoV 2 o 6 Nanosheet electrode anode material.

[0031] Porous CoV as the product of this example 2 o 6 Taking nanosheet material as an example, the structure was determined by X-ray diffractometer. attached figure 1 The X-ray diffraction pattern (XRD) shown shows that the porous CoV 2 o 6...

Embodiment 2

[0036] 1) First add 0.15g of acetylene black to 20ml of water and stir, then add 0.9963g of cobalt acetate and stir for 2 hours, so that the acetylene black can be completely immersed in water;

[0037] 2) Add 0.9385g of ammonium metavanadate to 20mL of deionized water, dissolve in a water bath at 85°C, add the resulting solution dropwise to the solution obtained in step 1), and stir together for 5 hours at room temperature to obtain a precursor;

[0038] 3) Dry the obtained precursor in a water bath at 85°C, and after grinding, calcinate at 450°C for 10 hours in air to obtain a yellow porous CoV 2 o 6 Nanosheet electrode anode material.

[0039] The porous CoV obtained in this example 2 o 6 Taking nanosheet material as an example, at a current density of 5A / g, the initial discharge capacity of the material is 690mAh / g, and the discharge capacity after 500 cycles can still reach 399mAh / g, and the capacity retention rate is 57.8%.

Embodiment 3

[0041] 1) First add 0.08g of acetylene black to 20ml of water and stir, then add 2g of cobalt acetate and stir for 2 hours, so that the acetylene black can be completely immersed in water;

[0042] 2) Add 2g of ammonium metavanadate to 20mL of deionized water, dissolve in a water bath at 85°C, add the resulting solution dropwise to the solution obtained in step 1), and stir together for 5 hours at room temperature to obtain a precursor;

[0043] 3) Dry the obtained precursor in a water bath at 85°C, and after grinding, calcinate at 450°C for 10 hours in air to obtain a yellow porous CoV 2 o 6 Nanosheet electrode anode material.

[0044] The porous CoV obtained in this example 2 o 6 Taking nanosheet material as an example, at a current density of 5A / g, the initial discharge capacity of the material is 589mAh / g, and the discharge capacity after 500 cycles can still reach 302mAh / g, and the capacity retention rate is 51.2%.

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Abstract

The invention relates to a porous CoV2O6 nanosheet electrode material and a preparation method thereof, the nanometer has a uniform morphology, the dimension is 4-10 mu m, the surface has an obvious porous structure, the aperture is 10-50 nm, and the nanometer is prepared by the following steps: 1) adding acetylene black into water, stirring the water, adding cobaltous acetate and stirring together, so that the acetylene black can be completely immersed into the water; 2) adding ammonium metavanadate into deionized water, dissolving with water-bath, adding the obtained solution drop by drop into the solution obtained in the step 1), stirring at normal temperature, and obtaining a precursor; 3) drying the obtained precursor in a water-bath condition, grinding and calcining with air, and obtaining the nanosheet. When the nanometer provided by the invention is used as a lithium ion battery cathode active material, high capacity and good cycle stability are shown; the invention has the advantages of simple technology, good feasibility, easy amplification and green chemistry.

Description

technical field [0001] The invention belongs to the technical field of nanomaterials and electrochemistry, in particular to porous CoV 2 o 6 Nano sheet electrode material and its preparation method and application The material can be used as negative electrode active material of lithium ion battery. Background technique [0002] Today, with the rapid development of pure electric vehicles, hybrid vehicles, and large-scale energy storage devices, lithium-ion batteries, as a green energy storage device, have been widely used in mobile phones, computers, electric vehicles and other fields. Therefore, the study of new nanostructures to obtain lithium-ion batteries with higher capacity, good safety performance and low cost has become the frontier and hot spot of current research on lithium-ion batteries. The capacity of traditional carbon-based negative electrode material graphite is low (theoretical capacity is 372mAhg -1 ). Cobalt oxide has the advantage of high capacity (&g...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/52H01M4/1391
CPCH01M4/1391H01M4/52H01M10/0525Y02E60/10
Inventor 麦立强张磊夏睿罗艳珠
Owner WUHAN UNIV OF TECH
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