Yolk-shell structure tin dioxide-nitrogen-doped carbon material and preparation method thereof

A technology of tin dioxide and nitrogen-doped carbon, which is applied to structural parts, nanotechnology for materials and surface science, electrical components, etc., can solve problems such as easy agglomeration and poor structural stability, and achieve improved conductivity and operation Convenience, the effect of controlling the size of the gap

Active Publication Date: 2013-10-23
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, from the electron microscope photos, not only the hollow carbon spheres have SnO 2 Nanoparticles, carbon spheres also have SnO on the outer surface 2 nanoparticles, in addition, there are several SnO inside the carbon sphere 2 Nanoparticles are easy to agglomerate during charging and discharging, resulting in poor structural stability

Method used

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  • Yolk-shell structure tin dioxide-nitrogen-doped carbon material and preparation method thereof
  • Yolk-shell structure tin dioxide-nitrogen-doped carbon material and preparation method thereof
  • Yolk-shell structure tin dioxide-nitrogen-doped carbon material and preparation method thereof

Examples

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Effect test

Embodiment 1

[0023] Take 80 mL of a mixed solvent with a volume ratio of ethanol and water of 3:5, and prepare K 2 SnO 3 ·3H 2 The solution with O concentration of 15 mmol / L and urea concentration of 0.45 mol / L was stirred evenly and then transferred to a 100 mL polytetrafluoroethylene-lined autoclave and placed in an oven for 140 o C was heated at a constant temperature for 2 hours, and the autoclave was taken out and cooled to room temperature naturally to obtain a white precipitate, which was washed with absolute ethanol and centrifuged for 3 times to remove the metal ion on the precipitate, at 60 o C dried for 12 hours to obtain porous SnO 2 ball.

[0024] 100 mg of the above porous SnO 2 The balls were dispersed in a mixed solvent of 160 mL of ethanol and 40 mL of water, ultrasonically mixed, and then magnetically stirred. During the stirring process, 3 mL of ammonia water with a mass fraction of 25% was slowly added, followed by 1.2 g of 0.92 g / mL of tetraethyl orthosilicate TE...

Embodiment 2

[0029] Take 50 mL of a mixed solvent with a volume ratio of ethanol and water of 3:5, and prepare K 2 SnO 3 ·3H 2 The solution with O concentration of 16 mmol / L and urea concentration of 0.5 mol / L was stirred evenly and transferred to a 100 mL polytetrafluoroethylene-lined autoclave, and placed in an oven for 145 o C was heated at a constant temperature for 2.5 hours, and the autoclave was taken out and cooled to room temperature naturally to obtain a white precipitate, which was washed with absolute ethanol and centrifuged 4 times to remove the metal ion on the precipitate, at 70 o C dried for 10 hours to obtain porous SnO 2 ball.

[0030] 80 mg of the above porous SnO 2 The spheres were dispersed in a mixed solvent of 160 mL ethanol and 40 mL water, ultrasonically mixed to make them uniform, and then magnetically stirred. During the stirring process, 4 mL of ammonia water with a mass fraction of 26% was slowly added, followed by 2.4 g of 0.93 g / mL of tetraethyl orthosi...

Embodiment 3

[0033] Take 50 mL of a mixed solvent with a volume ratio of ethanol and water of 3:5, and prepare K 2 SnO 3 ·3H 2 The solution with O concentration of 17 mmol / L and urea concentration of 0.55 mol / L was stirred evenly and transferred to a 100 mL polytetrafluoroethylene-lined autoclave, and placed in an oven for 150 o C was heated at a constant temperature for 3 hours, and the autoclave was taken out and cooled to room temperature naturally to obtain a white precipitate, which was washed with absolute ethanol and centrifuged 5 times to remove the metal ion on the precipitate, at 80 o C dried for 8 hours to obtain porous SnO 2 ball.

[0034] 120 mg of the above porous SnO 2The spheres were dispersed in a mixed solvent of 160 mL ethanol and 40 mL water, ultrasonically mixed evenly, and then magnetically stirred. During the stirring process, 2 mL of ammonia water with a mass fraction of 27% was slowly added, followed by 3.6 g of 0.94 g / mL of tetraethyl orthosilicate TEOS, sti...

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Abstract

The invention relates to a yolk-shell structure tin dioxide-nitrogen-doped carbon material and a preparation method thereof, belonging to the technical field of lithium ion battery electrode material. The yolk-shell structure SnO2@void@N-C material takes porous submicron tin dioxide SnO2 as a core and has the diameter of 200-400 nanometers; nitrogen-doped carbon (N-C) is taken as a shell, and the thickness of the shell is 15-20 nanometers; a cavity has the inner diameter of 300-500 nanometers; in the N-C shell, the mass percent of N element is 8-12%. The porous SnO2 core shortens the lithium ion diffusion path; the volume change of SnO2 can be effectively buffered by a gap between the SnO2 core and a carbon layer in the charge-discharge process, and the N-C can effectively improve the electrical conductivity of the material, so that the yolk-shell structure tin dioxide-nitrogen-doped carbon material has excellent electrochemical cycle stability. The thickness of the carbon layer can be regulated and controlled by controlling the concentration of dopamine or the auto-agglutination time, and the size of the gap can be regulated and controlled by controlling the quantity of tetraethoxysilane; the preparation method can well control the structure of the material, and is simple in technology and convenient to operate.

Description

technical field [0001] The invention belongs to the field of lithium-ion battery electrode materials, in particular to a yolk-shell structure tin dioxide-nitrogen-doped carbon material and a preparation method thereof. The material composition can be written as SnO2voidN-C, and the yolk-shell structure SnO2voidN-C The material is suitable as the negative electrode material of the lithium ion battery. Background technique [0002] SnO 2 As a negative electrode material for lithium-ion batteries, it has a high specific capacity (theoretical specific capacity is 790 mAh·g -1 ) and low discharge voltage (<1.5 V) have attracted widespread attention. But SnO 2 During the charge-discharge process, the volume change is large (>200%), and such a large volume expansion will easily lead to the pulverization of the material and detachment from the current collector, thereby reducing its cycle stability. Preparation of nano-SnO with different morphologies 2 and SnO 2 / C compo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/62B82Y30/00
CPCY02E60/12Y02E60/10
Inventor 杨文胜王仙宁
Owner BEIJING UNIV OF CHEM TECH
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