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Alumina-coated granules, as well as preparation method and application thereof

An alumina, coating type technology, applied in the field of chemistry, can solve the problems of uniformity and universality to be improved, and achieve the effect of high practical application prospect, simple coating method and strong universality.

Inactive Publication Date: 2014-02-26
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the aluminum salt used in this method is an inorganic aluminum salt, the price is cheap, and the process is relatively simple, but the uniformity and universality of its coating still need to be improved.

Method used

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  • Alumina-coated granules, as well as preparation method and application thereof
  • Alumina-coated granules, as well as preparation method and application thereof
  • Alumina-coated granules, as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] 1. Preparation of alumina-coated manganese trioxide

[0055] Mix 0.2g of manganese trioxide nanoparticles (average particle size is 100nm), 0.1g of aluminum salt aluminum nitrate (5.3*10 -3 mol / L), precipitant ammonium bicarbonate 1g (0.25mol / L) mixed in solvent water 50ml, reflux at 90°C under stirring for 2h for hydrolysis reaction, centrifuged, washed and dried to obtain aluminum hydroxide-coated trioxide Dimanganese particles were then calcined at 500° C. for 2 hours to obtain alumina-coated manganese trioxide particles.

[0056] The aluminum oxide-coated manganese trioxide particles have a core-shell structure, and its electron micrograph is shown in figure 1 shown. The material constituting the core is manganese trioxide with a particle size of 100nm, the material constituting the shell is aluminum oxide with a thickness of 8nm; and the aluminum oxide uniformly covers the surface of the manganese trioxide.

[0057] 2. The manganese trioxide particles coated wit...

Embodiment 2

[0068] 1. Preparation of alumina-coated nickel-cobalt lithium manganese oxide

[0069] 0.5 g of nickel-cobalt lithium manganese oxide LiNi with an average particle size of 10 μm 0.5 co 0.2 mn 0.3 o 2 , 0.1g of aluminum nitrate, 2g of precipitating agent ammonium bicarbonate mixed in 100ml of water and refluxed at 90°C under stirring for 2h of hydrolysis reaction, centrifuged, washed, dried, and then calcined at 500°C for 2h to obtain alumina-coated nickel-cobalt-manganese Lithium oxide particles.

[0070] The alumina-coated nickel-cobalt-lithium-manganese oxide particles have a core-shell structure. The material constituting the core is lithium nickel cobalt manganese oxide with an average particle size of 10 μm, such as image 3 Shown; the material constituting the shell is alumina with a thickness of 8nm, such as Figure 4 shown; and aluminum oxide evenly covers the surface of nickel cobalt lithium manganese oxide.

[0071] 2. Preparation of alumina-coated nickel-coba...

Embodiment 3

[0079] 1. Preparation of alumina-coated silver nanoparticles

[0080] Dissolve 0.2g of silver nanoparticles with an average particle size of 55nm (purchased from Beijing Deke Daojin Technology Co., Ltd.), 0.07g of aluminum nitrate, 2g of precipitant ammonium carbonate and 0.1g of PVP (0.018mol / L) in 50ml of water and mix , refluxed at 100°C for 2h under stirring, centrifuged, washed, dried, and calcined at 500°C for 2h to obtain alumina-coated silver nanoparticles.

[0081] The aluminum oxide-coated silver nanoparticles have a core-shell structure, and its transmission electron microscope pictures are as follows: Figure 6 shown. The material constituting the core is silver nanoparticles with an average particle diameter of 55nm, and the material constituting the shell is aluminum oxide with a thickness of 3nm; and the aluminum oxide uniformly covers the surface of the silver nanoparticles.

[0082] 2. Surface enhanced Raman test

[0083] Disperse aluminum oxide-coated silver...

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Abstract

The invention discloses alumina-coated granules, as well as a preparation method and application thereof. The alumina-coated granules consist of cores and shells which coat the cores. The cores are made of at least one of materials of metals, oxides, metal hydroxides, metal inorganic salts, non-metals, carbides, nitrides, lithium salts, semiconductors and organic compounds; the shell is made of Al2O3. By adopting a liquid phase method, the cores to be coated are mixed with aluminum salts, metal aluminum is precipitated by producing an alkaline environment in situ or externally adding alkaline, so that uniform, continuous and controllable coating can be formed on the surfaces of the cores. The coating method provided by the invention is simple, and has mild conditions and high universality; the coating layer has controllable thickness, completeness and uniformity; the alumina-coated granules has high practicability and a great application prospect in the field of catalysis, lithium ion batteries, surface-enhanced Raman, biomedicine and the like.

Description

technical field [0001] The invention belongs to the field of chemistry, and in particular relates to an alumina-coated particle, a preparation method and application thereof. Background technique [0002] Oxide coating refers to a precursor or oxide covering a layer of oxide on the surface of a substance (usually called a substrate), which can adjust some properties of the substrate and also protect the substrate. As a common oxide, alumina is cheap and has excellent properties, which makes alumina coating have broad application prospects in many fields. In terms of lithium-ion batteries, a large number of studies and practices have shown that coating electrode materials, especially positive electrode materials, with a nano-layer of alumina on the surface has a significant effect on reducing the speed of corrosion and related side reactions and prolonging the life of materials; in terms of catalysis , to coat the catalyst and / or carrier, although the activity of the catalys...

Claims

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Application Information

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IPC IPC(8): H01M4/48H01M4/505H01M4/525
CPCY02E60/122H01M4/364H01M4/505H01M4/525Y02E60/10
Inventor 曹安民张伟万立骏
Owner INST OF CHEM CHINESE ACAD OF SCI
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