Three-dimensional porous carbon material and preparation thereof, and application of three-dimensional porous carbon material in sodium ion battery

A three-dimensional porous, carbon material technology, applied in nanotechnology for materials and surface science, carbon preparation/purification, battery electrodes, etc. Super strong structural stability, high cross-linking degree and excellent sodium storage performance

Active Publication Date: 2018-04-27
湖南宸宇富基新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to solve the technical problems of poor structural stability of carbon nanosheets, easy agglomeration and stacking, etc., the first purpose of the present invention is to provide a three-dimensional porous carbon material, which aims to improve the structure of a stable, porous carbon material

Method used

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  • Three-dimensional porous carbon material and preparation thereof, and application of three-dimensional porous carbon material in sodium ion battery
  • Three-dimensional porous carbon material and preparation thereof, and application of three-dimensional porous carbon material in sodium ion battery

Examples

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Embodiment 1

[0053] Put 10 g of smectite ore in a solution (aqueous solution of alkali) with a pH of 8.5 for ultrasonic dispersion, put 1 g of dopamine in the above solution, control the polymerization temperature to 30 ° C, and control the polymerization time to 40 h, and the obtained precursor is carbonized. Inert gas protection is introduced, carbonization (heat treatment) is performed at a temperature of 400° C. for 1 hour, and the resulting product is washed with hot sodium hydroxide to obtain a carbon nanosheet material. The obtained carbon nanosheet material was added to a solution with a CTAB (cetyltrimethylammonium bromide) concentration of 1 g / L, ultrasonically dispersed, placed in a hydrothermal reaction kettle, and the hydrothermal reaction temperature was controlled to be 200 ° C. The thermal reaction time is 12h. The obtained hydrothermal product is heat-treated, protected by inert gas, and the carbonization temperature is 1000° C. for 2 hours to obtain a three-dimensional po...

Embodiment 2

[0056] Compared with Example 1, the only difference is that the carbonization (heat treatment) temperature after the hydrothermal reaction is 500°C. The thickness of the obtained carbon nanosheets is concentrated at about 60nm, and the specific surface area of ​​the obtained airgel material is 1540m 2 / g.

[0057] The three-dimensional porous carbon material prepared in this example was used as the working electrode, sodium was used as the counter electrode, and a button battery was assembled, and the capacity performance was tested at a current density of 50 mA / g. The test results show that the sodium ion battery negative electrode prepared in this example has good electrochemical properties: at a flow density of 50mA / g, after 100 cycles, the specific capacity of 202mA / g can still be maintained (the capacity retention rate is 98%).

Embodiment 3

[0059] Put 20g of smectite ore in a solution with a pH of 8.5 for ultrasonic dispersion, put 1g of dopamine in the above solution, control the polymerization temperature at 50°C, and control the polymerization time at 20h. The obtained precursor is carbonized and protected by inert gas. , the carbonization treatment temperature is 500° C., and the time is 2 hours. The obtained product is washed with hot sodium hydroxide to obtain a carbon nanosheet material. The obtained carbon nanosheet material was added to a solution with a CTAB concentration of 0.5 g / L, ultrasonically dispersed, placed in a hydrothermal reaction kettle, and the hydrothermal reaction temperature was controlled at 160° C., and the hydrothermal reaction time was 24 hours. The obtained hydrothermal product was heat-treated, protected by inert gas, and the carbonization temperature was 1100° C. for 4 hours to obtain a three-dimensional porous carbon material. The thickness of carbon nanosheets is concentrated a...

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Abstract

The invention specifically discloses a three-dimensional porous carbon material, belonging to the field of sodium ion battery materials. The three-dimensional porous carbon material is composed of carbon nanosheets and has a specific surface area of 100-2000 m<2>/g, and the thickness of the carbon nanosheets is in a range of 10-100 nm. The invention also discloses a preparation method for the three-dimensional porous carbon material. The preparation method comprises the following steps: subjecting dopamine and montmorillonite to a polymerization reaction in a solution to obtain a precursor;subjecting the precursor to heat treatment and washing to obtain a layered carbon nanosheet material; and subjecting the layered carbon nanosheet material to a hydrothermal reaction in a solution witha positive surfactant dissolved therein, and then carbonizing a hydrothermal reaction product so as to obtain the three-dimensional porous carbon material. The method uses easily available raw materials, is simple in preparation process and has good repeatability; and the prepared three-dimensional porous carbon material has the advantages of rich pores, a high degree of cross-linking, stable structure, a large specific surface area, good conductivity and the like, and shows good battery performance when applied to sodium ion batteries.

Description

technical field [0001] The invention relates to a negative electrode material of a sodium ion battery, in particular to a three-dimensional porous carbon material used as the negative electrode material of a sodium ion battery. Background technique [0002] Sodium-ion batteries have become a research hotspot in the new generation of secondary battery systems due to their rich sodium reserves. Compared with lithium-ion batteries, sodium-ion batteries have problems such as high negative electrode voltage and large radius of sodium ions, which pose many difficulties for the development of high-efficiency sodium-ion batteries. Electrode materials determine important parameters such as battery capacity, operating voltage, and cycle life. Although the reaction mechanism in sodium-ion batteries is similar to that in lithium-ion batteries, however, sodium ions are about 55% larger than lithium ions, and the intercalation and diffusion of sodium ions in materials with the same struc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/05H01M4/583H01M10/054B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/583H01M10/054Y02E60/10
Inventor 张治安陈玉祥李劼赖延清尹盟肖志伟
Owner 湖南宸宇富基新能源科技有限公司
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