Sodium vanadium phosphate electrode material of vanadium-site copper-doped composite carbon nano tube and preparation method and application of sodium vanadium phosphate electrode material

A technology of sodium vanadium phosphate and electrode material, applied in the direction of positive electrode, battery electrode, nanotechnology, etc., can solve the problems of weak structural stability, poor NVP ion and electronic conductivity characteristics, etc., to improve the rate performance and improve the electrochemical performance. , the effect of improving ionic conductivity and structural stability

Pending Publication Date: 2021-11-16
ZHONGBEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, a single modification method cannot effectively solve multiple problems such as poor ionic and electronic conductivity and weak structural stability of NVP.

Method used

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  • Sodium vanadium phosphate electrode material of vanadium-site copper-doped composite carbon nano tube and preparation method and application of sodium vanadium phosphate electrode material
  • Sodium vanadium phosphate electrode material of vanadium-site copper-doped composite carbon nano tube and preparation method and application of sodium vanadium phosphate electrode material
  • Sodium vanadium phosphate electrode material of vanadium-site copper-doped composite carbon nano tube and preparation method and application of sodium vanadium phosphate electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Example 1: Na 3.01 V 1.99 Cu 0.01 (PO 4 ) 3 Preparation of / C@CNTs cathode material (Cu0.01-NVP / C@CNTs)

[0034] Take 1.5312 g ammonium metavanadate, 2.3673 g sodium dihydrogen phosphate, 0.00895 g sodium acetate trihydrate, 0.01589 g copper nitrate trihydrate, 4.9750 g oxalic acid, 0.15 g carbon nanotubes, oxalic acid and sodium acetate were dissolved in deionized water in sequence, Ammonium vanadate and sodium dihydrogen phosphate were respectively added to the above solution sequentially, heated to 80°C by a water bath and kept stirred for 12 hours to obtain a dark blue sol.

[0035] Add carbon nanotubes to the black blue sol, use a cell breaker to uniformly disperse them in the sol, and freeze-dry for 48 hours to obtain a powder sample. After the obtained product was ground into powder, the sample was placed in a ceramic boat for initial firing in a tube furnace. The initial firing condition was that the heating rate was 2 °C / min, and the temperature was kept a...

Embodiment 2

[0039] Example 2: Na 3.04 V 1.96 Cu 0.04 (PO 4 ) 3 Preparation of @CNTs cathode material (Cu0.04-NVP / C@CNTs)

[0040] 1.5046 g ammonium vanadate, 2.3619 g sodium dihydrogen phosphate, 0.03572 g sodium acetate trihydrate, 0.0634 g copper nitrate trihydrate, 4.9636 g oxalic acid, and 0.15 g carbon nanotubes were dissolved in deionized water. The specific preparation method is the same as the method described in Example 1.

[0041] The obtained sample is used as the positive electrode material to prepare a button battery and test its electrochemical performance. The process is as follows:

[0042] Using 1.4 mL of N-methylpyrrolidone (NMP) as a solvent, the Na prepared in this example with a mass ratio of 7:2:1 3.01 V 1.99 Cu 0.01 (PO 4 ) 3 @CNTs active material, acetylene black, polyvinylidene fluoride (PVDF) are mixed and added to it. The above mixture was ball milled for four hours to obtain a uniform slurry. Use a coating machine to evenly coat the above mixture on...

Embodiment 3

[0044] Example 3: Na 3.07 V 1.93 Cu 0.07 (PO 4 ) 3 Preparation of @CNTs cathode material (Cu0.07-NVP / C@CNTs)

[0045] 1.4782 g ammonium vanadate, 2.3564 g sodium dihydrogen phosphate, 0.06236 g sodium acetate trihydrate, 0.1107 g copper nitrate trihydrate, 4.9520 g oxalic acid, and 0.15 g carbon nanotubes were dissolved in deionized water. The specific preparation method is the same as the preparation method described in Example 1.

[0046] The obtained sample is used as the positive electrode material to prepare a button battery and test its electrochemical performance. The process is as follows:

[0047] Using 1.4 mL of N-methylpyrrolidone (NMP) as a solvent, the Na prepared in this example with a mass ratio of 7:2:1 3.01 V 1.99 Cu 0.01 (PO 4 ) 3 @CNTs active material, acetylene black, polyvinylidene fluoride (PVDF) are mixed and added to it. The above mixture was ball milled for four hours to obtain a uniform slurry. Use a coating machine to evenly coat the abov...

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Abstract

The invention belongs to the technical field of new energy materials, and provides a sodium vanadium phosphate electrode material of a vanadium-site copper-doped composite carbon nano tube and a preparation method and application of the sodium vanadium phosphate electrode material. The electrode material is Na<3+x>V<2-x>Cux (PO4)3@5%CNTs, wherein x is equal to 0.01, 0.04, 0.07 or 0.1. Positive bivalent copper ions replace positive trivalent vanadium ions, holes are introduced into NVP unit cells, and the electron conductivity in the material is improved. Meanwhile, an ion transmission channel is widened, the unit cell structure is stabilized, and the ionic conductivity and structural stability of the material are remarkably improved. The carbon nanotubes with high electronic conductivity are compounded to form a layer-by-layer embedded conductive frame, so that the electronic conductivity among the active particles is improved. The intrinsic conductivity and crystal structure stability of the NVP electrode material are comprehensively improved from multiple angles, and the obtained material has excellent rate capability, high rate and long cycle stability when being used as a sodium ion battery positive electrode. The preparation method is simple to operate, easy to control and considerable in yield.

Description

technical field [0001] The invention belongs to the technical field of new energy materials, and in particular relates to a vanadium-site copper-doped composite carbon nanotube sodium vanadium phosphate electrode material and a preparation method and application thereof. Background technique [0002] Lithium-ion batteries have been widely used in the field of portable electronic devices due to their significant advantages such as high energy density and long cycle life, and are gradually being promoted to large-scale energy storage systems. However, based on the demand for the promotion of large-scale energy storage systems, an ideal energy storage system must not only have good energy storage characteristics, but also take into account the requirements of sustainable development such as low cost and wide source of raw materials. However, the current wide application of lithium batteries worldwide has intensified the consumption of lithium resources. At the same time, with t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/58H01M10/054B82Y30/00B82Y40/00
CPCH01M4/5825H01M4/626H01M4/628H01M4/625H01M10/054B82Y30/00B82Y40/00H01M2004/028Y02E60/10
Inventor 陈彦俊程军贾婷雅李丹王延忠郭丽
Owner ZHONGBEI UNIV
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