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Basic cobalt vanadate microsheet material and preparation method thereof

A technology of cobalt vanadate and micro flakes is applied in nanotechnology, nanotechnology, nanotechnology and other directions for material and surface science to achieve the effects of mild reaction conditions, suitable for mass production and simple process

Active Publication Date: 2020-07-14
SHIJIAZHUANG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In recent years, with the rapid development of nano / micro technology, materials with regular two-dimensional structure sheet and layer structure have been widely used in military, heavy industry and light industry due to their unique optical, mechanical, electromagnetic and gas-sensing properties. , petrochemical and other fields have shown a wide range of application prospects, and gradually attracted extensive attention from researchers, making it an important frontier research field in the world. co 3 (OH) 2 V 2 o 7 2H 2 O material

Method used

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  • Basic cobalt vanadate microsheet material and preparation method thereof
  • Basic cobalt vanadate microsheet material and preparation method thereof
  • Basic cobalt vanadate microsheet material and preparation method thereof

Examples

Experimental program
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Embodiment 1

[0027] At room temperature, respectively dissolve 2 mmol of ammonium metavanadate into 8 mL of distilled water, and dissolve 1 mmol of cobalt acetate into 8 mL of distilled water, and add the ammonium metavanadate solution dropwise to the cobalt acetate solution under magnetic stirring After the dropwise addition, continue to stir for 10 min, then transfer it to a 25 mL hydrothermal reaction kettle, seal it, place it in a constant temperature box, and conduct a hydrothermal reaction at 180 °C for 6 hours, cool to room temperature after the reaction, and use a deionized Water and absolute ethanol were centrifuged and washed 5 times, and the obtained precipitate was dried in an oven at 80°C for 8 hours to obtain the product.

[0028] The above product was subjected to X-ray diffraction (XRD) analysis, figure 1 is the XRD spectrum. The diffraction peaks of the product do not match the substances containing Co, V, O, and H in the existing JCPDS-ICDD database, but the intensity an...

Embodiment 2

[0030]At room temperature, dissolve 1.8 mmol of ammonium metavanadate in 14 mL of distilled water, dissolve 1 mmol of cobalt acetate in 2 mL of distilled water, and add the ammonium metavanadate solution dropwise to the cobalt acetate solution under magnetic stirring. Stir for 10 min, then transfer to a 20 mL hydrothermal reaction kettle, seal it and place it in a thermostat for 12 hours at 180 °C for hydrothermal reaction, cool to room temperature after the reaction, and centrifuge with deionized water and absolute ethanol, respectively After washing 5 times, place in an oven and dry at 80°C for 12 hours to obtain basic cobalt vanadate microsheet material. The above product was subjected to X-ray diffraction (XRD) analysis, Figure 5 Be XRD spectrum figure, its XRD spectrum is identical with embodiment 1, based on the same analysis of embodiment 1, its product is Co 3 (OH) 2 V 2 o 7 2H 2 O. Figure 6 It is a scanning electron microscope analysis picture, which shows tha...

Embodiment 3

[0032] At room temperature, dissolve 1 mmol of ammonium metavanadate in 14 mL of distilled water, dissolve 0.5 mmol of cobalt acetate in 2 mL of distilled water, and add the ammonium metavanadate solution dropwise to the cobalt acetate solution under magnetic stirring , continue to stir for 10 min after the dropwise addition, then transfer it into a 20 mL hydrothermal reaction kettle, seal it and place it in a constant temperature box for a hydrothermal reaction at 160 °C for 6 hours, cool to room temperature after the reaction, and use deionized water and Absolute ethanol was centrifuged and washed 5 times, and the obtained precipitate was dried in an oven at 80°C for 8 hours to obtain basic cobalt vanadate microsheet materials. The above product was subjected to X-ray diffraction (XRD) analysis, Figure 7 Be XRD spectrum figure, its XRD spectrum is identical with embodiment 1, based on the same analysis of embodiment 1, its product is Co 3 (OH) 2 V 2 o 7 2H 2 O.

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Abstract

The invention discloses a basic cobalt vanadate micron sheet material and a preparation method thereof, belonging to the field of new energy materials, and its chemical composition is Co 3 (OH) 2 V 2 o 7 2H 2 O, the cobalt basic vanadate microflakes have a regular hexagonal structure with a diameter of 0.5-2 μm. Its preparation method includes: 1. Cobalt acetate and metavanadic acid are prepared into a mixed solution according to the Co:V molar ratio of 1:1~2; 2. After stirring evenly, react at 150~180°C for 2~24h to obtain a crude product solution ; ③ cooling the solution of the crude product obtained in step ② to room temperature, washing and drying the obtained precipitate to obtain basic cobalt vanadate micron sheet material. It is synthesized by one-step hydrothermal method and wet method. No surfactant and template are used in the preparation process. The reaction conditions are mild, the process is simple, and it is suitable for mass production. It is found that the basic vanadic acid is tested by assembling it into an experimental battery to test its electrochemical performance. As the negative electrode active material of lithium-ion secondary batteries, cobalt microsheets have stable discharge capacity.

Description

technical field [0001] The invention belongs to the field of inorganic materials and preparation methods thereof, and in particular relates to a basic cobalt vanadate microsheet material with a hexagonal sheet shape and a preparation method thereof. Background technique [0002] Cobalt vanadate is an inorganic compound with excellent chemical stability, heat resistance and good crystallization properties. The application prospect has aroused people's extensive research interest. According to the different proportions of Co, V, and O in the material, a variety of cobalt vanadate materials with different compositions and structures can be obtained. At present, the research on cobalt vanadate materials mainly includes Co 2 V 2 o 7 、CoV 2 o 6 、Co 3 V 2 o 8 Wait. Among them, there are few research reports on cobalt basic vanadate nano / micro materials. [0003] In recent years, with the rapid development of nano / micro technology, materials with regular two-dimensional s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/58H01M10/0525B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/5825H01M10/0525Y02E60/10
Inventor 张绍岩郧海丽高岩磊侯梦华候玲玲
Owner SHIJIAZHUANG UNIVERSITY
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