Preparation method of hollow nickel cobaltate nano polyhedron

A polyhedron, nickel cobalt oxide technology, applied in nanotechnology, chemical instruments and methods, cobalt compounds, etc., can solve the problems of poor product dispersion, large product particle size, long reaction time, etc., and achieve easy preparation, uniform particles, and simple operation. Effect

Inactive Publication Date: 2015-05-27
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the high-temperature solid-phase reaction method is the traditional synthesis method of nickel cobaltate. Although the process is simple, the reaction time is long, the energy consumption is high, and the product particle size is large; during the mechanochemical synthesis process, a large number of strains and defects are introduced, and the resulting product has poor dispersion; In the sol-gel method, the particle size of the product obtained by adding a surfactant is small and evenly distributed, but it is easy to introduce impurities, so it is particularly important to develop a new synthesis method for nickel cobaltate

Method used

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  • Preparation method of hollow nickel cobaltate nano polyhedron
  • Preparation method of hollow nickel cobaltate nano polyhedron
  • Preparation method of hollow nickel cobaltate nano polyhedron

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Dissolve 0.146 grams of cobalt nitrate hexahydrate and 0.328 grams of dimethylimidazole in 25 milliliters of anhydrous methanol respectively, then mix the two solutions fully, let stand for 20 hours, collect the precipitate, centrifuge several times, and wash with absolute ethanol Afterwards, it was dried in a vacuum oven at 60°C for 12 hours to obtain the metal-organic framework complex ZIF-67.

[0044] Add 0.150 grams of nickel nitrate to 25 milliliters of absolute ethanol, mix well, and form a clear solution, then add the metal-organic framework complex ZIF-67 powder and mix thoroughly, place in an oven at 90°C, and keep the temperature for 1 hour . After the reaction is completed, cool to room temperature, collect the precipitate, wash the obtained product with ethanol, centrifuge, discard the solvent, and dry it in vacuum at 60°C to obtain a nickel-cobalt hydroxide precursor (ie, a hollow polyhedron of nickel-cobalt hydroxide).

[0045] The precursor is heated at ...

Embodiment 2

[0047] Dissolve 0.728 grams of cobalt nitrate hexahydrate and 0.547 grams of dimethylimidazole in 25 milliliters of anhydrous methanol respectively, and then mix the two solutions fully and let stand for 30 hours to collect the precipitate. The resulting product is centrifuged several times and washed with anhydrous After washing with ethanol, dry in a vacuum oven at 60°C for 12 hours to obtain the metal organic framework complex ZIF-67.

[0048] Add 0.100 g of nickel nitrate into 25 ml of anhydrous methanol, mix well to form a clear solution, add the above metal organic framework complex ZIF-67 powder and mix well, place in an oven at 80°C, and keep the temperature for 2 hours . After the reaction is completed, cool to room temperature, collect the precipitate, wash the obtained product with acetone, centrifuge, discard the solvent, and dry in vacuum at 60°C to obtain a nickel-cobalt hydroxide precursor (ie, a hollow polyhedron of nickel-cobalt hydroxide).

[0049] The precu...

Embodiment 3

[0051] Dissolve 0.249g of cobalt nitrate hexahydrate and 0.328g of dimethylimidazole in 25mL of anhydrous methanol respectively, and then mix the two solutions fully, and let stand for 24 hours to collect the precipitate. The obtained product is centrifuged several times and washed with absolute ethanol After washing, it was placed in a vacuum drying oven at 60° C. for 12 hours to obtain the metal-organic framework complex ZIF-67.

[0052] Add 0.050 g of nickel nitrate to 25 ml of absolute ethanol, mix well to form a clear solution, add the above metal organic framework complex ZIF-67 powder and mix well, place in an oven at 90°C, and keep the temperature for 1 hour . After the reaction is completed, cool to room temperature, collect the precipitate, wash the obtained product with ethanol, centrifuge, discard the solvent, and dry it in vacuum at 60°C to obtain a nickel-cobalt hydroxide precursor (ie, a hollow polyhedron of nickel-cobalt hydroxide). Such as image 3 The X-ray...

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Abstract

The invention discloses a preparation method of a hollow nickel cobaltate nano polyhedron. The method comprises the following steps: (1) mixing an organic metal framework complex ZIF-67 and an alcoholic solution of nickel nitrate uniformly, and reacting at the temperature condition of 80-100 DEG C; (2) cooling to room temperature after reaction, collecting precipitate, cleaning by ethyl alcohol or other non-polar solvents, centrifuging, removing the solvents, and carrying out vacuum drying so as to obtain a hollow nickel cobalt hydroxide polyhedron; and (3) annealing the hollow nickel cobalt hydroxide polyhedron in air heating so as to obtain the porous nickel cobaltate nano hollow polyhedron. The method is simple to operate, and is environmentally friendly, and the mold plate removing process is omitted; the hollow obtained nickel cobaltate nano polyhedron has the relatively high specific surface area, relatively low mass transfer resistance and relatively excellent structure stability; as an electrode material of the lithium ion battery, the hollow nickel cobaltate nano polyhedron is superior to an existing transition metal oxide electrode material in cost and performance.

Description

technical field [0001] The invention belongs to the field of lithium-ion battery materials, and relates to a method for preparing a nickel cobaltate nano-hollow polyhedron by using a metal-organic framework complex as a self-sacrificing template. Background technique [0002] Lithium-ion battery is a rechargeable secondary battery. When charging and discharging, lithium ions act as charge carriers and migrate back and forth between the positive and negative electrodes. In recent years, rechargeable lithium-ion batteries have been widely used in various electronic devices, such as laptops, tablets, cameras, mobile phones, etc., due to their high energy density and portability. In order to meet the requirements of these electronic devices for battery cycle life, energy density, and high-current charge-discharge capability, the preparation technology of electrode materials is particularly critical. By controlling appropriate reaction conditions, the shape, size, composition, an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/52C01G51/00B82Y40/00
CPCB82Y40/00C01G51/00H01M4/523Y02E60/10
Inventor 董晓臣孙陈诚杨骏黄维
Owner NANJING UNIV OF TECH
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