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Preparation method of phosphorus-doped two-dimensional carbon material and application thereof in sodium-ion battery

A two-dimensional carbon material, sodium-ion battery technology, applied in battery electrodes, non-aqueous electrolyte batteries, circuits, etc., can solve the problems of poor sodium storage activity, difficult to effectively insert, etc., achieves low cost, controllable conditions, and is conducive to The effect of industrial production

Active Publication Date: 2016-05-25
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Electrode material is one of the key factors that determine the specific capacity and cycle life of batteries. Since the radius of sodium ions is larger than that of lithium ions, it is difficult for sodium ions to be effectively inserted into the commercial graphite negative electrode of lithium-ion batteries, and the sodium storage activity is poor. Suitable anode materials for sodium storage are extremely challenging
The extraordinary and unique properties of two-dimensional carbon materials in electronics, photoelectricity, and catalysis have attracted the attention of a large number of researchers, and are considered to be very promising electrode materials for sodium-ion batteries. However, the biggest challenge currently facing is how to commercialize them. Production of high-quality two-dimensional carbon materials
Heteroatom doping can effectively adjust the properties of carbon materials, which can make it more prominent in many applications, but in situ preparation of heteroatom-doped 2D carbon materials is more challenging

Method used

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  • Preparation method of phosphorus-doped two-dimensional carbon material and application thereof in sodium-ion battery
  • Preparation method of phosphorus-doped two-dimensional carbon material and application thereof in sodium-ion battery
  • Preparation method of phosphorus-doped two-dimensional carbon material and application thereof in sodium-ion battery

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Experimental program
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Effect test

Embodiment 1

[0031] Mix 0.4g of carbon quantum dots and 4.0g of sodium dihydrogen phosphate evenly, and then calcinate them at 900°C for 2h under the protection of an inert gas, with a heating rate of 10°C / min, and cool down naturally. Grind the calcined product into powder, add an appropriate amount of concentrated hydrochloric acid, adjust its pH to neutral, centrifuge at 8000r / min for 10min, wash with deionized water for 5 times, and vacuum dry at 100°C for 12h to obtain a black powder . Its scanning electron microscope picture is figure 1 , it can be seen that the product is a large area of ​​nano flakes. figure 2 Its transmission electron microscope picture is consistent with the scanning electron microscope result. image 3 Is its X-ray diffraction spectrum, the product obtained is amorphous carbon. X-ray photoelectron spectroscopy results ( Figure 4 ) shows that the phosphorus content in the obtained two-dimensional carbon material is 1.39At%. Adsorption and desorption test r...

Embodiment 2

[0033] Mix 0.4g of carbon quantum dots and 4.0g of sodium dihydrogen phosphate evenly, and then calcinate them at 800°C for 2h under the protection of an inert gas, with a heating rate of 10°C / min, and cool down naturally. Grind the calcined product into powder, add an appropriate amount of concentrated hydrochloric acid, adjust its pH to neutral, centrifuge at 8000r / min for 10min, wash with deionized water for 5 times, and vacuum dry at 100°C for 12h to obtain a black powder . Figure 6 It is its transmission electron microscope picture, and two-dimensional nano-sheets can be clearly observed. X-ray photoelectron spectroscopy results ( Figure 7 ) shows that the phosphorus content in the obtained two-dimensional carbon material is 0.75At%.

Embodiment 3

[0035] 0.4g of carbon quantum dots and 3.2g of sodium dihydrogen phosphate were mixed evenly, and then calcined at 900°C for 2h under the protection of an inert gas, with a heating rate of 10°C / min, and the temperature was naturally lowered. Grind the calcined product into powder, add an appropriate amount of concentrated hydrochloric acid, adjust its pH to neutral, centrifuge at 8000r / min for 10min, wash with deionized water for 5 times, and vacuum dry at 100°C for 12h to obtain a black powder . Figure 8 It is its transmission electron microscope picture, and two-dimensional nano-sheets can be clearly observed. X-ray photoelectron spectroscopy results ( Figure 9 ) shows that the phosphorus content in the obtained two-dimensional carbon material is 1.30At%.

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Abstract

The invention discloses a preparation method of a phosphorus-doped two-dimensional carbon material and application thereof in a sodium-ion battery. The method comprises the step of putting the mixture of carbon quantum dots and phosphate in an inert atmosphere for high-temperature calcination to obtain the phosphorus-doped two-dimensional carbon material. The method is simple and convenient in operation, short in period and high in yield, and is beneficial for industrial production; and the obtained phosphorus-doped two-dimensional carbon material as an electrode material can be used for preparing the sodium-ion battery with excellent electrical performance.

Description

technical field [0001] The invention relates to a preparation method of a phosphorus-doped two-dimensional carbon material and its application in a sodium ion battery, belonging to the technical field of carbon material preparation. Background technique [0002] Lithium-ion batteries have been widely used in various electronic devices and power tools due to their unique advantages. However, the reserves of lithium resources on the earth are not abundant, and the distribution is very uneven. With the gradual consumption of lithium resources, its price will become higher and higher. This will limit the application of lithium-ion batteries in the field of large-scale energy storage. Sodium has similar physical and chemical properties to lithium, and sodium resources are abundant and evenly distributed. Sodium-ion batteries are likely to replicate the success of lithium-ion batteries and are very promising secondary-ion batteries. [0003] From zero-dimensional to three-dimensi...

Claims

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Application Information

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IPC IPC(8): H01M4/583H01M10/05
CPCH01M4/583H01M10/05Y02E60/10
Inventor 纪效波侯红帅贾鑫男陈珺黄兆东张艳邹国强曹晓雨
Owner CENT SOUTH UNIV
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