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Preparation method and application of bismuth nanoparticle composite material protected by double carbon layers

A particle composite, bismuth nanotechnology, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems of complex preparation method, large cycle loss, uneven size of bismuth nanoparticle, etc. Achieve the effect of alleviating volume changes, maintaining integrity, and ensuring cycle stability

Active Publication Date: 2022-03-01
JINAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The material has a large number of pores, but the preparation method is complicated, and the size of bismuth nanoparticles is not uniform, and the circulation loss is large

Method used

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  • Preparation method and application of bismuth nanoparticle composite material protected by double carbon layers
  • Preparation method and application of bismuth nanoparticle composite material protected by double carbon layers
  • Preparation method and application of bismuth nanoparticle composite material protected by double carbon layers

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Step 1: Disperse 150 mg of bismuth nitrate pentahydrate and 750 mg of organic ligand trimesic acid in 60 mL of a mixed solvent of methanol and DMF (volume ratio of methanol to DMF: 1:4), and stir for 30 minutes to form a transparent and uniform solution.

[0047] Step 2: Place the transparent and uniform solution in step 1 in a 100mL hydrothermal reaction kettle, conduct hydrothermal reaction at 180°C for 12h, and filter and dry to obtain the Bi MOF precursor.

[0048] Step 3: Take 400 mg of the dried Bi MOF precursor in step 2 and ultrasonically disperse it in 200 mL of Tris buffer solution (10 mM, pH = 8-9) for 0.5 h. Under vigorous stirring, 200 mg of dopamine hydrochloride solution was added to the solution, and the stirring was continued for 12 h to obtain Bi MOF@PDA.

[0049] Step 4: The 50mg BiMOF@PDA product obtained in Step 3 is filtered, washed and dried, and placed in two quartz boats with 500mg of dicyandiamide, and then placed in a tube furnace for heat tre...

Embodiment 2

[0056] With embodiment 1, difference is:

[0057] Step 4: The 300mg BiMOF@PDA product obtained in Step 3 was filtered, washed and dried, and placed in two quartz boats with 300mg of dicyandiamide, and then placed in a tube furnace for heat treatment, equipped with dicyandiamide The amine quartz boat was placed above the air flow, and the temperature was raised from room temperature to 800°C at a rate of 2°C / min in an argon atmosphere, and kept for 3 hours for full calcination to obtain the calcined product Bi / C.

[0058] Embodiment 2 has selected different precursor dosage ratios, and its transmission electron microscope photograph of gained Bi / C composite material is as follows Figure 6 shown.

Embodiment 3

[0060] With embodiment 1, difference is:

[0061] Step 4: The 50mg BiMOF@PDA product obtained in Step 3 is filtered, washed and dried, and placed in two quartz boats with 500mg of dicyandiamide, and then placed in a tube furnace for heat treatment, equipped with dicyandiamide The amine quartz boat was placed above the gas flow, and the temperature was raised from room temperature to 1000°C at a rate of 2°C / min in an argon atmosphere, and kept for 3 hours for full calcination to obtain the calcined product Bi / C.

[0062] Embodiment 3 selects the calcining temperature different from embodiment 1, under higher carbonization temperature, Ostwald phenomenon has occurred, and its transmission electron micrograph is as follows Figure 7 shown.

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Abstract

The invention discloses a preparation method and application of a double-carbon-layer-protected bismuth nanoparticle composite material, and the preparation method comprises the following steps: S1, dispersing a bismuth source and an organic ligand in an organic solvent to obtain a uniform solution; s2, taking the uniform solution, and carrying out hydrothermal reaction to generate a Bi MOF precursor; s3, dispersing the Bi MOF precursor obtained in the step S3 into a Tris buffer solution, adding dopamine hydrochloride under violent stirring, and continuously stirring to obtain Bi MOF (at) PDA; and S4, respectively putting the Bi MOF (at) PDA obtained in the step S4 and a nitrogen-containing pore-forming agent into two quartz boats, and carrying out carbon thermal reduction treatment, so as to obtain the double-carbon-layer protected bismuth nanoparticle composite material. The overall synthesis method is simple, the utilization rate of active substances is high, the electrode material structure is stable, the number of active sites is large, and the rate and cycling stability of the potassium ion battery are better improved.

Description

technical field [0001] The invention relates to the field of potassium ion batteries, in particular to a preparation method and application of a bismuth nanoparticle composite material protected by double carbon layers. Background technique [0002] The demand for new green and environmentally friendly energy continues to rise along with the rapid development of the economy and society. As the carrier of new energy, the development of large-scale energy storage equipment is of great significance. Lithium-ion batteries have been commercially used in energy devices, but the lack of lithium resources and lack of excellent battery performance are the bottlenecks that limit the development of lithium-ion batteries. Potassium-ion batteries, as a strong candidate, can be embedded in commercial graphite anode materials to achieve a theoretical potassium storage capacity close to that of graphite due to their abundant potassium resources and standard redox potential close to that of...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/38H01M10/054B82Y30/00B82Y40/00
CPCH01M4/38H01M4/628H01M4/625H01M10/054B82Y30/00B82Y40/00H01M2004/027H01M2004/021Y02E60/10
Inventor 李宏岩刘喜孙影娟
Owner JINAN UNIVERSITY
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