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Preparation method for coating oxide powder with amorphous phosphate thin layer by soaking in mixed acid liquor

A technology of oxide powder and phosphate, which is applied in the direction of phosphate, chemical instruments and methods, nickel compounds, etc., to achieve the effects of easy operation, large-scale application, and simple process

Pending Publication Date: 2021-12-03
HUNAN NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, there is no report on the controllable growth of amorphous phosphate coating on the surface of oxide materials by direct acid solution immersion.

Method used

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  • Preparation method for coating oxide powder with amorphous phosphate thin layer by soaking in mixed acid liquor
  • Preparation method for coating oxide powder with amorphous phosphate thin layer by soaking in mixed acid liquor
  • Preparation method for coating oxide powder with amorphous phosphate thin layer by soaking in mixed acid liquor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Measure 17.1 μL concentrated phosphoric acid (98%wt), weigh 0.3 g SA, disperse in 50 mL ethanol, and mix with 5 g manganese trioxide (Mn 2 o 3 ) powders were mixed, and stirred continuously for 1.5 h at 25 °C. After the reaction, washed twice with deionized water and once with ethanol, the powder was collected and dried in a vacuum oven at 60 °C for 12 h to obtain about 3- 15 nm thick amorphous phosphate-coated Mn 2 o 3 Powder.

Embodiment 2

[0034] Measure 20.3 μL of concentrated phosphoric acid (98%wt), weigh 1.0 g of modified starch and disperse in 70 mL of ethylene glycol, and then mix with 5 g of ternary material LiNi 0.8 co 0.15 Al 0.05 o2 (NCA) mixed, stirred continuously at 30 °C for 4 h, after the reaction, washed with deionized water and ethanol three times each, and dried in a vacuum oven at 40 °C for 12 h to obtain a 3-15 nm thick Amorphous phosphate-coated NCA powder.

Embodiment 3

[0036] Measure 30.5 μL concentrated phosphoric acid (98%wt), weigh 0.5 g SA and disperse in 100 mL ethanol, and mix with 5 g manganese trioxide (Mn 2 o 3 ) powders were mixed and stirred continuously for 1.5 h at 25 °C. After the reaction was over, the powder was washed twice with deionized water and once with ethanol, and the powder was collected and dried in a vacuum oven at 60 °C for 12 h to obtain about 7- 20 nm thick amorphous phosphate-coated Mn 2 o 3 Powder.

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Abstract

The invention discloses a preparation method for coating oxide powder with an amorphous phosphate thin layer by soaking in mixed acid liquor. The specific operation scheme is as follows: firstly, mixing and stirring strong phosphoric acid, an additive and a dispersing agent are according to the ratio of (1-5000)[mu]L : (0.01-50)g : (10-500)mL to obtain mixed acid liquor; dispersing the oxide powder into the mixed acid solution according to a solid-to-liquid ratio of 1g : (1-100)mL, and stirring for a period of time (0.5-6 h) at a constant temperature (0-80 DEG C) to obtain slurry; and finally, carrying out suction filtration or centrifugation on the slurry to collect powder, washing with water and ethanol for 2-5 times, and drying to obtain phosphate-coated oxide powder. According to the invention, phosphoric acid is used as a phosphorus source, in-situ coating is realized by using one-step surface growth, a nano amorphous phosphate coating layer with controllable thickness is formed, and the phosphate-coated oxide material is prepared. The heat resistance, the oxidation resistance and the structural stability of the oxide material are improved, and the performance of the oxide is further improved.

Description

technical field [0001] The invention relates to a coating modification method of amorphous phosphate with controllable thickness, in particular to a preparation method for coating oxide powder with controllable thickness amorphous phosphate in one step based on mixed acid solution. Background technique [0002] Functional oxide powders are widely used in daily life, such as catalysts used in chemical production, electrode materials, electrocatalytic materials and capacitor materials used in energy storage, anti-radiation materials, special refractory materials, corrosion-resistant materials, and desiccant, adsorbent, etc. Therefore, it has played an important role in the development of human society and economy. However, oxide materials have certain deficiencies in practical applications, such as poor corrosion resistance and high temperature oxidation resistance, which need to be modified. Commonly used modification methods for oxide powders include: coating modification,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/26C01B25/45C01G45/02C01G51/00C01G53/00H01M4/36H01M4/485H01M4/50H01M4/525H01M4/58H01M4/62
CPCC01G45/02C01G53/42C01B25/45C01G51/42C01B25/26H01M4/366H01M4/50H01M4/485H01M4/525H01M4/5825H01M4/62C01P2004/03C01P2004/04C01P2002/82C01P2002/85Y02E60/10
Inventor 杨立山赵双双周君健
Owner HUNAN NORMAL UNIVERSITY
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