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Graphitized carbon-coated porous carbon sphere with high specific surface area as well as preparation method and application thereof

A high specific surface area, graphitized carbon technology, applied in electrochemical generators, active material electrodes, electrical components, etc., can solve the problems of low energy density of negative electrode materials, poor cycle performance, limited sodium storage active sites, etc. To achieve good effect, prevent collapse, optimize the effect of sodium storage

Active Publication Date: 2020-12-15
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, ordinary hard carbon materials have limited sodium storage active sites, resulting in low energy density and poor cycle performance of anode materials for sodium-ion batteries.

Method used

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  • Graphitized carbon-coated porous carbon sphere with high specific surface area as well as preparation method and application thereof
  • Graphitized carbon-coated porous carbon sphere with high specific surface area as well as preparation method and application thereof
  • Graphitized carbon-coated porous carbon sphere with high specific surface area as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] 1. Pour ammonia water, absolute ethanol and distilled water into a three-necked flask at a volume ratio of 1:80:200, stir and mix evenly to obtain solution A.

[0035] 2. Add 0.2g of resorcinol into solution A, stir until it is completely dissolved to obtain solution B. Then add 0.28mL of formaldehyde into solution B, stir, and heat in a water bath at 100°C for 24h to obtain a phenolic resin polymer solution. The phenolic resin polymer solution was hydrothermally reacted at 100° C. for 24 hours, centrifuged, filtered, washed and dried to obtain phenolic resin nanospheres.

[0036] 3. The phenolic resin nanospheres were placed in a tube furnace in a nitrogen atmosphere and calcined at 800° C. to prepare carbon nanospheres (CS).

[0037] 4. KOH was used as the activator, and CS was activated to form pores according to the mass ratio of CS:KOH of 1:1. After the reaction, excess KOH was washed away and dried to obtain high specific surface area carbon nanospheres (HSCS). ...

Embodiment 2

[0042] Table 1 for g at 200mA -1 The effect of activated mass ratio (CS:KOH) on the electrochemical performance of electrode materials under constant current charge and discharge. The difference from Example 1 is that the mass ratio of CS to KOH is different. It can be seen from Table 1 that as the mass ratio of CS and KOH increases, the specific capacity of the first charge and discharge increases, but the efficiency value is basically in a stable state.

[0043] Table 1 Effect of (CS:KOH) mass ratio on the electrochemical performance of electrode materials

[0044]

Embodiment 3

[0046] Table 2 for g at 200mA -1 Effect of carbon coating on the electrochemical performance of materials under constant current charge and discharge conditions. The difference from Example 2 is that no nickelocene is used to coat the carbon. It can be seen from Table 2 that the increase in the mass ratio of CS and KOH brings about a larger change in the first discharge specific capacity than the first charge specific capacity, which leads to a decrease in the efficiency value.

[0047] Table 2 Effect of carbon coating on the electrochemical performance of electrode materials

[0048]

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Abstract

The invention belongs to the field of new energy, and discloses graphitized carbon coated porous carbon spheres with a high specific surface area as well as a preparation method and an application ofthe graphitized carbon coated porous carbon spheres. The preparation method of the porous carbon spheres comprises the following steps of calcining phenolic resin-based nanospheres at 600-1600 DEG C in a protective atmosphere, carrying out activated pore-forming on the obtained phenolic resin-based nanospheres by using strong alkali, cleaning and drying to obtain HSCS; uniformly grinding HSCS andnickelocene to obtain a mixture, carbonizing the mixture at 600-1600 DEG C in a nitrogen atmosphere, cleaning the carbonized mixture with acid, and drying the cleaned mixture to obtain the catalyst; the phenolic resin-based nanospheres are prepared by the following steps, adding resorcinol and formaldehyde into a mixed solution of ammonia water, absolute ethyl alcohol and distilled water, stirringuntil resorcinol and formaldehyde are completely dissolved, heating in a water bath at 30-90 DEG C, carrying out hydrothermal reaction at 100-200 DEG C, centrifuging, carrying out suction filtration,washing and drying. The method is advantaged in that the porous carbon sphere has an optimized sodium storage effect, improves first coulombic efficiency of the sodium ion battery, and can be appliedto the sodium ion battery.

Description

technical field [0001] The invention belongs to the technical field of new energy, and more specifically relates to a graphitized carbon-coated porous carbon sphere with a high specific surface area and a preparation method and application thereof. Background technique [0002] At present, lithium-ion batteries have been widely used in portable electronic products and new energy vehicles. However, the global lithium resources are only 47 million tons, and the continuous mining will lead to the shortage of lithium, and the price of lithium will also soar. Therefore, it is a general trend to find a new secondary battery to replace the lithium-ion battery. As an element of the same main group, sodium has similar physical and chemical properties to lithium. At the same time, sodium is abundant in natural reserves and exists in seawater in large quantities in the form of sodium ions. Therefore, Na-ion batteries have broad application prospects. The development of suitable elec...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/587H01M10/054
CPCH01M4/587H01M4/628H01M10/054H01M2004/021H01M2004/027Y02E60/10
Inventor 程德建李争晖钟威豪程奥
Owner GUANGDONG UNIV OF TECH
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