Bismuth phosphorus sulfur/carbon composite nanofiber negative electrode material for sodium-ion battery, preparation method of bismuth phosphorus sulfur/carbon composite nanofiber negative electrode material and sodium-ion battery

A sodium-ion battery and nanofiber technology, applied in battery electrodes, nanotechnology for materials and surface science, negative electrodes, etc., can solve the problem of low specific capacity of negative electrode materials, achieve large specific surface area, increase capacity, and improve Effect of Magnification Performance

Active Publication Date: 2020-06-05
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The invention provides a preparation method of bismuth phosphorus sulfur / carbon composite nanofiber negative electrode material for sodium ion batteries, so as to solve the problem of low specific capacity of negative electrode materials in the prior art

Method used

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  • Bismuth phosphorus sulfur/carbon composite nanofiber negative electrode material for sodium-ion battery, preparation method of bismuth phosphorus sulfur/carbon composite nanofiber negative electrode material and sodium-ion battery
  • Bismuth phosphorus sulfur/carbon composite nanofiber negative electrode material for sodium-ion battery, preparation method of bismuth phosphorus sulfur/carbon composite nanofiber negative electrode material and sodium-ion battery
  • Bismuth phosphorus sulfur/carbon composite nanofiber negative electrode material for sodium-ion battery, preparation method of bismuth phosphorus sulfur/carbon composite nanofiber negative electrode material and sodium-ion battery

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Embodiment 1

[0036] The preparation method of bismuth phosphorus sulfur / carbon composite nanofiber negative electrode material for sodium ion battery of the present embodiment comprises the following steps:

[0037] 1) Add 1.0 g of polyacrylonitrile (PAN) and 0.8 g of bismuth chloride into 10 mL of N,N-dimethylformamide (DMF), then stir overnight at 60 °C to obtain a transparent viscous electrospun silk liquid;

[0038] 2) Add the electrospinning solution obtained in step 1) into the syringe of the electrospinning device, set the distance between the syringe and the aluminum foil receiver to be 18cm, and the voltage of the applied high-voltage electrostatic field is 20kV, and then use 1mL / h The propulsion speed injection, electrospinning;

[0039] 3) Calcining the filaments obtained by electrospinning in step 2) at 280°C for 2 hours in air to obtain fibers, and then raising the temperature to 800°C at a heating rate of 5°C / min for 2 hours under the protection of nitrogen to obtain bismuth...

Embodiment 2

[0043] The preparation method of bismuth phosphorus sulfur / carbon composite nanofiber negative electrode material for sodium ion battery of the present embodiment comprises the following steps:

[0044] 1) Add 1.0g of polyacrylonitrile (PAN) and 0.5g of bismuth chloride to 10mL of N,N-dimethylformamide (DMF), then stir overnight at 60°C to obtain an electrospinning solution;

[0045] 2) Add the electrospinning liquid obtained in step 1) into the syringe of the electrospinning device, set the distance between the syringe and the aluminum foil receiver to be 15cm, and the voltage of the applied high-voltage electrostatic field is 18kV, and then 1.2mL / Inject at a propulsion speed of h for electrospinning;

[0046]3) Calcining the filaments obtained by electrospinning in step 2) at 280°C for 2 hours in air to obtain fibers, and then raising the temperature to 800°C at a heating rate of 5°C / min for 2 hours under the protection of nitrogen to obtain bismuth / carbon Precursor;

[0...

Embodiment 3

[0050] The preparation method of bismuth phosphorus sulfur / carbon composite nanofiber negative electrode material for sodium ion battery of the present embodiment comprises the following steps:

[0051] 1) Add 1.0 g of polyacrylonitrile (PAN) and 1.0 g of bismuth chloride into 10 mL of N,N-dimethylformamide (DMF), then stir overnight at 60 °C to obtain a transparent viscous electrospun silk liquid;

[0052] 2) Add the electrospinning solution obtained in step 1) into the syringe of the electrospinning device, set the distance between the syringe and the aluminum foil receiver to be 18cm, and the voltage of the applied high-voltage electrostatic field is 25kV, and then 0.8mL / Injection at a propulsion speed of h for electrospinning;

[0053] 3) Calcining the filaments obtained by electrospinning in step 2) at 280°C for 2 hours in air to obtain fibers, and then raising the temperature to 800°C at a heating rate of 5°C / min for 2 hours under the protection of nitrogen to obtain b...

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Abstract

The invention relates to a bismuth phosphorus sulfur / carbon composite nanofiber negative electrode material for a sodium-ion battery, a preparation method of the bismuth phosphorus sulfur / carbon composite nanofiber negative electrode material and the sodium-ion battery, and belongs to the technical field of sodium-ion batteries. The preparation method of the bismuth phosphorus sulfur / carbon composite nanofiber negative electrode material for the sodium-ion battery comprises the following steps of mixing polyacrylonitrile, bismuth salt and an organic solvent to prepare a mixed solution, and then performing electrostatic spinning to prepare spinning fibers; preserving the heat of the prepared spinning fibers at 250-300 DEG C for 1-3 hours for pre-oxidation, and then preserving the heat in aninert atmosphere at 700-900 DEG C for 1-3 hours to prepare a precursor; and uniformly mixing the prepared precursor with phosphorus and sulfur, and carrying out calcining at 500-700 DEG C for 4-7 days to obtain the bismuth phosphorus sulfur / carbon composite nanofiber negative electrode material. The material prepared by the preparation method of the bismuth phosphorus sulfur / carbon composite nanofiber negative electrode material for the sodium-ion battery is of a one-dimensional nanowire structure and stable in structure in the charging and discharging process, and has relatively high specific discharge capacity and good cycling stability.

Description

technical field [0001] The invention relates to a bismuth-phosphorus-sulfur / carbon composite nanofiber negative electrode material for a sodium-ion battery, a preparation method thereof, and a sodium-ion battery, belonging to the technical field of sodium-ion batteries. Background technique [0002] Traditional fossil energy (such as coal, oil, etc.) has limited reserves, and due to unrestrained exploitation and use, the existing fossil energy reserves have decreased sharply, which cannot meet the growing needs of human production and life. More seriously, fossil fuels have caused environmental pollution and endangered people's health. Therefore, it has become an irresistible trend to seek green and environmentally friendly new energy sources and promote the development of renewable energy sources. Renewable energy such as solar energy and wind energy has the characteristics of abundant resources, clean and pollution-free, and is an effective way to solve energy problems. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F9/22D01F1/10B82Y30/00H01M4/36H01M4/38H01M4/58H01M4/62H01M10/054
CPCB82Y30/00D01F1/10D01F9/22H01M4/362H01M4/38H01M4/5815H01M4/625H01M10/054H01M2004/021H01M2004/027Y02E60/10
Inventor 彭生杰陈影李林林
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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