Nano magnesium cobaltate as well as preparation method and application thereof

A technology of nano-cobalt and magnesium cobaltate, applied in nanotechnology, chemical instruments and methods, cobalt compounds, etc., can solve the problem of low capacity of magnesium cobaltate

Pending Publication Date: 2021-12-28
JIANGHAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The present invention provides a kind of nano-magnesium cobaltate and its preparation met

Method used

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  • Nano magnesium cobaltate as well as preparation method and application thereof
  • Nano magnesium cobaltate as well as preparation method and application thereof
  • Nano magnesium cobaltate as well as preparation method and application thereof

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Experimental program
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Embodiment approach

[0043] As an implementation manner of the embodiments of the present invention, the millimolar ratio of the magnesium source, cobalt source, precipitation agent and structure synthesis agent is 1-10:2-10:1-15:1-5.

[0044] According to MgCo 2 o 4 It can be seen from the chemical formula that in the unit cell of the material, the ratio of Mg to Co atoms is 1:2, so the millimolar ratio of adding magnesium to cobalt source is the most suitable of 1:2. Based on this, excessive or too little of a certain source may lead to the generation of other impurities (magnesium hydroxide, cobalt hydroxide), which will affect the synthesis of magnesium cobaltate crystals, and the purity of the material is not high.

[0045] The precipitant is mainly hydrolyzed to produce hydroxide ions, which combine with magnesium and cobalt ions to undergo a precipitation reaction, so that a precursor can be deposited on the foamed nickel, and the precursor can be further oxidized into magnesium cobaltate ...

Embodiment 1

[0070] Embodiment 1 provides a kind of nano-magnesium cobaltate and its preparation method and application, and the method is as follows:

[0071] 1. Weigh 0.2564g magnesium nitrate (1mmol), 0.5820g cobalt nitrate (2mmol), 0.3g urea (5mmol), and 0.074g ammonium fluoride (2mmol) and dissolve them in 50ml of deionized water, stir for 1 hour to obtain a uniform mixture solution.

[0072] 2. Nickel foam (1×4cm 2 ) were ultrasonicated with 3 mol / L dilute hydrochloric acid, acetone, absolute ethanol, and deionized water for 15 minutes, and dried at a temperature of 50° C. for 70 minutes.

[0073] 3. Transfer the mixed solution obtained in step 1 and the nickel foam obtained in step 2 to a 100ml reactor, and conduct hydrothermal treatment at 120°C for 6 hours. After cooling down to room temperature naturally, wash with absolute ethanol and deionized water for 3 times, and then dried at 60°C for 5 hours to obtain a magnesium cobaltate precursor.

[0074] 4. Heat the precursor obtai...

Embodiment 2

[0076] Embodiment 2 provides a kind of nano-magnesium cobaltate and its preparation method and application, the method is as follows:

[0077] 1. Weigh 0.322g magnesium acetate (1.5mmol), 0.53g cobalt acetate (3mmol), 0.54g oxalic acid (6mmol), and 0.056g ammonium fluoride (1.5mmol) and dissolve them in 50ml of deionized water, stir for 1 hour to obtain Mix the solution evenly.

[0078] 2. Nickel foam (2×3cm 2 ) respectively with 3mol / L dilute hydrochloric acid, acetone, absolute ethanol, and deionized water for 20 minutes, and dried at a temperature of 60°C for 65 minutes.

[0079] 3. Transfer the mixed solution obtained in step 1 and the nickel foam obtained in step 2 to a 100ml reactor, and conduct hydrothermal treatment at 125°C for 5 hours. After cooling down to room temperature naturally, wash with absolute ethanol and deionized water for 4 times, and then dried at 60°C for 5 hours to obtain a magnesium cobaltate precursor.

[0080] 4. Heat the precursor obtained in s...

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Abstract

The invention provides nano magnesium cobaltate and a preparation method and application thereof.The XRD spectrum of the magnesium cobaltate has characteristic peaks at the diffraction angle 2theta of 18.96 +/-0.04 degrees, 31.2 +/-0.1 degrees, 36.76 +/-0.1 degrees, 38.46 +/-0.04 degrees, 44.71 +/-0.15 degrees, 55.53 +/-0.1 degrees, 59.22 +/-0.13 degrees, 65.08 +/-0.02 degrees, 68.46 +/-0.11 degrees, 73.94 +/-0.1 degrees, 77.15 +/-0.1 degrees and 78.21 +/-0.5 degrees, the microstructure of the magnesium cobaltate is a nanoneedle, the nanoneedle is composed of a plurality of nanoparticles, the length of the nanoneedle is 1.1 to 1.54 [mu] m, the average diameter of the nanoneedle is 0.08 to 0.10 [mu] m, and pores are formed in the nanoneedle. When the magnesium cobaltate provided by the invention is used as an electrode material and the current density is 25A/g, the rate capability retention rate is 54-63.8%, the capacity retention rate is 70.4-98.5% after 10000 cycles of current density of 25A/g, and the capacity retention rate is high; after 10000 cycles of circulation, the specific discharge capacity is 1005.3-1449.92 F/g, and the capacity is high; therefore, the product can be used for supercapacitors.

Description

technical field [0001] The invention belongs to the technical field of electrode material preparation, and in particular relates to a nanometer magnesium cobaltate and its preparation method and application. Background technique [0002] Magnesium cobaltate is a metal oxide with a high theoretical capacity of 3122F g due to its unique composition and available multiple potential oxidation states -1 , is one of the best electrode materials, and can be used as an electrode material in supercapacitors. A supercapacitor is a new type of electronic device between traditional capacitors and batteries. It not only has high energy density, fast charge / discharge behavior, environmental friendliness, and long cycle life, but also has a higher energy density than traditional capacitors. Higher energy density characteristics, higher power density performance than batteries. At present, supercapacitors have been put into use in people's lives, ranging from small electronic equipment to...

Claims

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Application Information

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IPC IPC(8): C01G51/00B82Y40/00H01G11/30H01G11/24
CPCC01G51/40B82Y40/00H01G11/30H01G11/24C01P2004/16C01P2004/61C01P2004/64C01P2002/72C01P2002/32C01P2006/40Y02E60/13
Inventor 柯尊洁倪航田玉刘万能朱小龙郑广
Owner JIANGHAN UNIVERSITY
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