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A kind of high specific capacity hydrated magnesium vanadate and its preparation method and application

A technology for hydrating magnesium vanadate and magnesium nitrate, which is applied in chemical instruments and methods, vanadium compounds, structural parts, etc., can solve the problems of harsh preparation conditions, low specific capacity, complicated processes, etc., and achieves short time consumption, mild conditions, The effect of simple process flow

Active Publication Date: 2021-06-04
NANJING FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Invention purpose: in order to solve the existing Mg x V 2 o 5 ·nH 2 The preparation conditions of O are harsh, the process is complex and the specific capacity is low. The present invention provides a simple method to prepare Mg with high specific capacity. x V 2 o 5 ·nH 2 O electrode material

Method used

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  • A kind of high specific capacity hydrated magnesium vanadate and its preparation method and application
  • A kind of high specific capacity hydrated magnesium vanadate and its preparation method and application
  • A kind of high specific capacity hydrated magnesium vanadate and its preparation method and application

Examples

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Embodiment 1

[0029] (1) Disperse and dissolve 1 / 3mmoL of vanadium pentoxide and 1mmoL of magnesium nitrate in 20mL of deionized water, stir well, and then conduct a hydrothermal reaction at 160°C for 24 hours;

[0030] (2) Wash the precipitate obtained in step (1) with deionized water and dry it in a blast drying oven at 80°C for 12 hours to obtain Mg x V 2 o 5 ·nH 2 O.

[0031] Assembly and testing of zinc ion battery: get the Mg obtained in this embodiment x V 2 o 5 ·nH 2 O is mixed with Super P conductive carbon black and polyvinylidene fluoride (PVDF) in a mass ratio of 70:20:10, and N-methylpyrrolidone (NMP) is used as a dispersant, and stirred evenly to form a slurry; then the slurry Coat it on titanium foil, scrape it flat, and evaporate NMP in an oven at 80°C; compact it under 10MPa, and then use a slicer to cut the above titanium foil into circular electrode sheets with a diameter of 12mm; use the above electrode sheets, metal Zinc sheet, Whatman glass fiber membrane (GF / A...

Embodiment 2

[0037] (1) Disperse and dissolve 1 / 3mmoL of vanadium pentoxide and 1 / 3mmoL of magnesium nitrate in 20mL of deionized water, stir evenly, and then conduct a hydrothermal reaction at 180°C for 12 hours;

[0038] (2) Wash the precipitate obtained in step (1) with deionized water and dry it in a blast drying oven at 80°C for 12 hours to obtain Mg x V 2 o 5 ·nH 2 O.

[0039] The assembly and testing of the zinc ion battery refer to Example 1.

[0040] The Mg prepared in this embodiment x V 2 o 5 ·nH 2 The XRD pattern of O is as follows Figure 5 As shown, similar to the detection results in CN107170967A and US20180205068A1, it shows a significant (001) diffraction peak, corresponding to a layered structure. According to the Bragg equation, the layer spacing is as high as

[0041] According to the ICP-OES result, it can be known that the Mg prepared in this embodiment x V 2 o 5 ·nH 2 In O, x=0.17; in addition, according to the TGA test result ( Figure 6 ) can be de...

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Abstract

The invention discloses a high specific capacity hydrated magnesium vanadate and its preparation method and application. Vanadium pentoxide and magnesium nitrate are dispersed and dissolved in deionized water, stirred and dispersed evenly, and subjected to a hydrothermal reaction at 160-180°C for 12-20°C. After 24 hours, the precipitate was left to stand, washed with deionized water and dried at 80°C for 12 hours to obtain the product. The obtained hydrated magnesium vanadate structural formula is Mg x V 2 o 5 ·nH 2 O, wherein, x is 0.17-0.2, and n is 1.26-1.38. The prepared hydrated magnesium vanadate, Super P conductive carbon black and polyvinylidene fluoride are mixed to prepare a slurry, and then coated on a titanium foil to make a positive electrode, and a zinc sheet negative electrode, a glass fiber separator and an aqueous system containing zinc ions The electrolyte is composed of a zinc-ion battery, and the highest discharge specific capacity can reach 410.8mAh / g at a current density of 100mA / g.

Description

technical field [0001] The invention relates to the technical field of battery materials, in particular to a Mg x V 2 o 5 ·nH 2 The preparation method and application of O. Background technique [0002] With the increasing environmental pollution and the depletion of fossil resources, it is urgent to develop clean and renewable energy sources such as solar energy, wind energy, and tidal energy. However, these new energy sources are intermittent and require supporting energy storage equipment. Among many energy storage devices, lithium-ion batteries occupy a dominant position and have been widely used in mobile electronic devices and electric vehicles. Unfortunately, lithium-ion batteries are facing three major problems: (1) The reserves of lithium minerals on the earth's surface are low, resulting in expensive lithium raw materials; (2) The organic solvents in the electrolyte of lithium-ion batteries are expensive and flammable. (3) The assembly of lithium-ion batterie...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G31/00H01M4/48H01M10/054
CPCY02E60/10
Inventor 陈继章周维君
Owner NANJING FORESTRY UNIV