A kind of sulfur-doped hard carbon material, its preparation method and its potassium ion battery as negative electrode

A technology of sulfur doping and potassium ions, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of complex preparation methods and inability to industrialize production, and achieve uniform distribution of sulfur elements, low production costs, and excellent electrochemical performance Effect

Active Publication Date: 2021-07-02
东北大学秦皇岛分校
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Problems solved by technology

The porous sulfur-doped graphene airgel as the negative electrode of the sodium / potassium ion battery has excellent cycle performance and rate performance, but the preparation method is complicated and cannot be industrialized

Method used

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  • A kind of sulfur-doped hard carbon material, its preparation method and its potassium ion battery as negative electrode
  • A kind of sulfur-doped hard carbon material, its preparation method and its potassium ion battery as negative electrode
  • A kind of sulfur-doped hard carbon material, its preparation method and its potassium ion battery as negative electrode

Examples

Experimental program
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Effect test

Embodiment 1

[0068] (1) Pickling high-sulfur coal with a sulfur content of 4.27% in 1mol / L hydrochloric acid solution for 24 hours, then soaking in NaOH solution for 24 hours, wherein the mass ratio of NaOH solution solute to high-sulfur coal after pickling is 1:1 , to prepare a pre-product after freeze-drying;

[0069] (2) heat-treat the pre-product at a heating rate of 2°C / min to 800°C, and keep it warm for 2 hours to obtain a hard carbon material;

[0070] (3) Soak the hard carbon material in 2mol / L hydrochloric acid solution for 12h, wash with deionized water, filter and dry at 100°C to obtain a sulfur-doped hard carbon with a sulfur content of 3.75% and a pore size distribution of 0.5nm to 2μm Material, figure 1 It is the SEM image of the hard carbon material, as can be seen from the figure that the carbon is in a honeycomb structure, figure 2 It is the XRD spectrum of the hard carbon material, which shows that the hard carbon material is amorphous hard carbon.

Embodiment 2

[0072] The difference from Example 1 is that the sulfur content of the high-sulfur coal in step (1) is 3%, and a sulfur-doped hard carbon material with a sulfur content of 2.79% is obtained.

Embodiment 3

[0074] The difference from Example 1 is that the sulfur content of the high-sulfur coal in step (1) is 8%, and a sulfur-doped hard carbon material with a sulfur content of 7.49% is obtained.

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Abstract

The invention relates to a sulfur-doped hard carbon material, its preparation method and a potassium ion battery as a negative electrode. The hard carbon material has a porous structure, and the sulfur atoms are at least partially distributed inside the hard carbon material. The preparation method of the hard carbon material comprises: (1) acid-washing high-sulfur coal, and then immersing in an alkaline solution to obtain a pre-product; (2) heat-treating the pre-product under a protective atmosphere to obtain Hard carbon material; (3) soaking, washing, filtering and drying the hard carbon material in acid solution. The invention uses high-sulfur coal as raw material, and the pore size of the prepared hard carbon material can meet the requirements of potassium ion intercalation / extraction. At the same time, the sulfur element is in-situ self-doped on the surface of the material and in the carbon matrix, endowing the material with a new Electrochemical activity and more ideal pore structure. The sulfur element distribution in the carbon material prepared by the invention is more uniform, and the production cost is lower.

Description

technical field [0001] The invention belongs to the technical field of hard carbon materials, and in particular relates to a sulfur-doped hard carbon material, a preparation method thereof and a potassium ion battery used as a negative electrode. The sulfur-doped hard carbon material is used in the field of potassium ion batteries. Background technique [0002] At present, a new generation of secondary batteries has attracted widespread interest from scientific researchers. Lithium-ion batteries have outstanding advantages such as high energy density, long cycle life, and no pollution. They have become the mainstream of the battery market and have begun to be used to drive electric vehicles. However, with the large-scale application of lithium-ion batteries, the price of lithium and the limited nature of resources have become more and more worrying. In recent years, many new alternative energy storage batteries have emerged and developed rapidly, mainly including secondary b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/583H01M10/054
CPCH01M4/583H01M10/054Y02E60/10
Inventor 王庆王昭雄罗绍华王志远张亚辉刘延国郝爱民高成林
Owner 东北大学秦皇岛分校
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