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A carbon nanosheet material and its preparation and application in sodium-ion batteries

A carbon nanosheet and nanosheet technology, applied in the field of sodium ion batteries, can solve the problems of poor performance cycle stability, fast capacity decay, limited application, etc. Effect

Active Publication Date: 2020-01-07
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

Traditional carbon-based materials have poor conductivity, poor performance cycle stability, and fast capacity decay, which greatly limits their application in sodium-ion batteries.

Method used

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  • A carbon nanosheet material and its preparation and application in sodium-ion batteries
  • A carbon nanosheet material and its preparation and application in sodium-ion batteries

Examples

Experimental program
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Effect test

Embodiment 1

[0065] Stir 20mL of 1.0mol / L nickel nitrate solution, 0.5mL of polyethylene glycol (molecular weight 600, 0.02mol) and 0.5mL of 1mol / L sodium hydroxide to carry out hydrothermal reaction. The holding temperature is 180°C and the holding time is 24h. Then wash with deionized water for 3 times, then wash with absolute ethanol for 2 times, and then dry in a vacuum oven at 60° C. for 10 h to obtain metal nanosheets. Put 0.08g metal nanosheets (0.001mol) in 200mL of Tris buffer solution with 8.8g dopamine (0.05mol) and 6.63g lysine (0.045mol), adjust the pH value to 8.5, let stand for 12h, after pumping Filter, wash and dry to obtain a carbon nitrogen-metal nanosheet precursor. The precursor was carbonized under nitrogen atmosphere, the carbonization temperature was 1000°C, the carbonization time was 2h, and the heating rate was 2°C / min. Subsequently, the high-temperature carbonized product was repeatedly washed with dilute acid solution and water, then placed at 50° C., and vacuu...

Embodiment 2

[0068] Stir 20mL of 1.0mol / L copper nitrate solution, 0.5mL of polyethylene glycol (molecular weight: 600, 0.02mol) and 0.5mL of 1mol / L sodium hydroxide to carry out hydrothermal reaction at 160°C for 24 hours. Then wash with deionized water for 3 times, then wash with absolute ethanol for 2 times, and then dry in a vacuum oven at 60° C. for 10 h to obtain metal nanosheets. Put 0.8g of metal nanosheets (0.01mol) in 200mL of Tris buffer solution with 8.8g of dopamine (0.05mol) and 5.17g of asparagine (0.04mol), adjust the pH value to 8.5, let it stand for 16h, after pumping Filter, wash and dry to obtain a carbon nitrogen-metal nanosheet precursor. The precursor was carbonized under nitrogen atmosphere, the carbonization temperature was 1000°C, the carbonization time was 2h, and the heating rate was 2°C / min. Subsequently, the high-temperature carbonized product was repeatedly washed with dilute acid solution and water, then placed at 50° C., and vacuum-dried for 8 hours. A ca...

Embodiment 3

[0070] Stir 20mL of 1.0mol / L ferric nitrate solution, 0.5mL of polyethylene glycol (molecular weight 600, 0.02mol) and 0.5mL of 1mol / L sodium hydroxide to carry out hydrothermal reaction. The holding temperature is 160°C and the holding time is 16h. Then wash with deionized water for 3 times, then wash with absolute ethanol for 2 times, and then dry in a vacuum oven at 60° C. for 10 h to obtain metal nanosheets. 0.08g metal nanosheets (0.005mol) were placed in 200mL Tris buffer solution with 8.8g dopamine (0.05mol) and 2.09g aspartic acid (0.02mol), and the pH value was adjusted to 8.5. Suction filtration, washing and drying to obtain a carbon nitrogen-metal nanosheet precursor. The precursor was carbonized under nitrogen atmosphere, the carbonization temperature was 900°C, the carbonization time was 2h, and the heating rate was 2°C / min. Subsequently, the high-temperature carbonized product was repeatedly washed with dilute acid solution and water, then placed at 50° C., and ...

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Abstract

The invention belongs to the field of negative electrode materials for sodium-ion batteries and particularly discloses a preparation method of a carbon nanosheet material. The preparation method comprises the following steps of (1) carrying out hydrothermal reaction on a water solution comprising a transition metal salt, polyethylene glycol and alkali to prepare a metal oxide nanosheet; and (2) putting the metal oxide nanosheet, dopamine and amino acid into a Tris buffer solution, mixing to prepare a precursor, carrying out thermal treatment on the precursor at 900-1200 DEG C and then washingand drying to obtain the carbon nanosheet material. The invention further discloses the carbon nanosheet prepared by adopting the preparation method and an application of the carbon nanosheet. The carbon nanosheet is a two-dimensional nanomaterial, is high in nitrogen doping content, large in interlayer spacing, good in conductivity, simple in preparation process and good in repeatability, has high cycle efficiency, high specific capacity and rate capability when applied to a sodium-ion secondary battery, and has a broad industrial application prospect.

Description

technical field [0001] The invention relates to a preparation method of a carbon nano sheet material and its application in a sodium ion battery, belonging to the field of the sodium ion battery. Background technique [0002] With the gradual reduction of traditional energy sources such as coal, oil, and natural gas, and increasingly severe environmental problems, the demand for small separated mobile power supplies has shown an explosive growth trend, and various rechargeable chemical power supplies represented by lithium batteries have received more and more attention. However, due to the relatively small element content of lithium in the earth's crust, the extraction and recovery of lithium is difficult, so it is necessary to develop new battery systems. [0003] Sodium-ion batteries are high-performance energy storage systems that have developed rapidly in recent years. Sodium is very abundant in nature, accounting for about 2.74% of the earth's crust, and it is widely ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/583H01M4/62H01M10/054C01B32/15
CPCH01M4/583H01M4/625H01M10/054Y02E60/10
Inventor 张治安尹盟陈玉祥赖延清张凯
Owner 湖南宸宇富基新能源科技有限公司
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