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Preparation method of high-performance carbon material

A carbon material and high-performance technology, which is applied in the field of preparation of high-performance carbon materials, can solve the problems of low energy density of zinc ion capacitors, hinder the development of zinc ion capacitors, and limit the storage capacity of zinc ions, so as to improve electrochemical performance and conduct electricity. Enhanced performance and increased specific surface area

Inactive Publication Date: 2020-11-27
WUYI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, zinc ion capacitor is a new concept proposed in recent years, so its development is still in its infancy, and there are many bottlenecks to be overcome, such as the dendrite problem of the zinc electrode, the side reaction problem of the electrolyte, etc.
In particular, due to the inherent physical adsorption / desorption mechanism, the limited storage capacity for Zn ions on carbon cathodes cannot match the high theoretical capacity of Zn anodes, resulting in significantly lower energy densities of reported Zn-ion capacitors than expected, hindering the development of Zn ions Further development of capacitors

Method used

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  • Preparation method of high-performance carbon material
  • Preparation method of high-performance carbon material
  • Preparation method of high-performance carbon material

Examples

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Embodiment 1

[0026] The method for preparing a high-performance carbon material in this embodiment specifically includes the following steps:

[0027] S1). Under a certain atmosphere, mix 0.5 g of pitch, 7 g of sodium chloride and 0.5 g of sodium nitrate and ball mill for 90 minutes to obtain precursor powder;

[0028] S2) Put the precursor powder in a tube furnace under a nitrogen atmosphere and set the temperature to 850°C and the annealing time to 90min. The collected powder after annealing is cleaned, centrifuged and dried to obtain high performance Carbon material (CR). Under the same annealing conditions, it is most contrasted to directly prepare carbon material (C-blank) with 0.5g pitch without molten salt.

[0029] In this embodiment, the obtained C-blank and C-R are respectively coated on carbon paper to prepare corresponding electrodes. The carbon material is the cathode material, the zinc sheet is the anode material, and 2 mol L -1 Zinc sulfate is the electrolyte, and the electrochemi...

Embodiment 2－11

[0035] The foregoing embodiment provides a method for preparing a high-performance carbon material. The foregoing embodiment is based on the solution of Example 1. By using molten salt as a template, Examples 2-11 regulate the quality of molten salt and the milling time and annealing temperature and Time affects the performance of the prepared carbon material, and the relationship is shown in Table 1.

[0036] Table 1 Example 2-11 Preparation and adjustment, and comparison of results of prepared materials

[0037]

[0038] Among them, Examples 1, 2 and 3 show that the quality of sodium chloride has a certain influence on the properties of carbon materials, and Examples 1, 4 and 5 show that the quality of sodium nitrate has a great influence on the properties of carbon materials.

[0039] Examples 1, 6, and 7 show that the milling time will also affect the performance of carbon materials to a certain extent.

[0040] Examples 1, 8 and 9 show that the annealing temperature has a great i...

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Abstract

The invention provides a preparation method of a high-performance carbon material, which comprises the following steps of: mixing 0.5g of asphalt and 6-10g of molten salt, and carrying out ball milling for a certain time to prepare precursor powder; and in a nitrogen atmosphere, annealing the precursor powder by using a tubular furnace to obtain black powder, and cleaning, centrifuging and dryingthe black powder to obtain the high-performance carbon material. According to the invention, in the atmosphere of nitrogen, the molten salt is used as a template, the type and quality of the molten salt and the annealing temperature and time are regulated and controlled, the specific surface area of a sample is changed, and meanwhile, the conductivity and active sites of the sample are increased,so that the electrochemical performance of the prepared carbon material is improved; the used carbon source (asphalt) is wide in source and low in cost, is waste, is high in yield and can be used forlarge-scale production; a sample is more fluffy, a carbon material prepared from asphalt has not been applied to a zinc ion capacitor at present, and the carbon material has a very wide application prospect in the aspect of energy storage.

Description

Technical field [0001] The invention relates to the technical field of energy storage materials, in particular to a method for preparing high-performance carbon materials. Background technique [0002] The development of high-performance energy storage devices is crucial to break the intermittent and uneven geographical distribution of renewable energy and clean energy (such as solar, wind, tidal, geothermal, etc.) production. At present, many kinds of energy storage devices have been developed to realize energy storage and transportation, such as lithium ion batteries, zinc ion batteries, traditional capacitors and super capacitors. [0003] However, it is difficult for them to meet high energy density and power density at the same time. Generally speaking, battery-type energy storage devices have good energy density, but low power density and poor cycle stability. In contrast, capacitive energy storage devices have better power density, but their energy density needs to be furt...

Claims

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Application Information

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IPC IPC(8): C01B32/312C01B32/05H01G11/24H01G11/44
CPCC01B32/05C01B32/312H01G11/24H01G11/44
Inventor 卢锡洪曾思琪宋寅裴晓康郑得洲王付鑫徐维
Owner WUYI UNIV
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