Nitrogen-doped hard carbon material, preparation method thereof and potassium ion battery taking nitrogen-doped hard carbon material as cathode

A nitrogen doping, potassium ion technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of small pore size of materials, can not meet the requirements of potassium ion battery de/mosaic, etc., to improve surface wettability, good cycle Effects of stability, good mechanical properties

Inactive Publication Date: 2019-02-01
东北大学秦皇岛分校
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The synthesis method of the nitrogen-doped porous carbon material is simple, the operation steps are highly controllable, and it is easy to expand production, but the pore size of the material is small, which cannot meet the removal / insertion requirements of potassium ion batteries

Method used

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  • Nitrogen-doped hard carbon material, preparation method thereof and potassium ion battery taking nitrogen-doped hard carbon material as cathode
  • Nitrogen-doped hard carbon material, preparation method thereof and potassium ion battery taking nitrogen-doped hard carbon material as cathode
  • Nitrogen-doped hard carbon material, preparation method thereof and potassium ion battery taking nitrogen-doped hard carbon material as cathode

Examples

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Embodiment 1

[0072] A kind of preparation method of nitrogen-doped hard carbon material comprises the steps:

[0073] (1) Immerse the walnut split wood in a 1mol / L hydrochloric acid solution for pickling for 24 hours, then soak it in an aqueous urea solution for 12 hours, wherein the mass ratio of urea and walnut split wood in the urea aqueous solution is 1:1, after freeze-drying Prepare pre-products;

[0074] (2) Heat the pre-product at a heating rate of 0.5°C / min to 800°C and heat it for 2 hours to obtain a hard carbon material;

[0075] (3) The hard carbon material was soaked in 1mol / L hydrochloric acid solution for 12 hours, washed with deionized water, filtered and dried at 100°C to obtain a nitrogen-doped hard carbon material with a nitrogen content of 6.56%. The morphology of the nitrogen-doped hard carbon material is as follows figure 1 As shown in the figure, it can be seen that the hard carbon material has a honeycomb structure, the pore size distribution is 2nm-2μm, and the sp...

Embodiment 2

[0077] The difference from Example 1 is that the mass ratio of urea to plant waste in the urea aqueous solution in step (1) is 0.1:1, the nitrogen content of the obtained nitrogen-doped hard carbon material is 1.0%, and the specific surface area is 57.2m 2 / g, the interlayer distance is 0.395nm.

Embodiment 3

[0079] The difference from Example 1 is that the mass ratio of urea to plant waste in the urea aqueous solution in step (1) is 2:1, the nitrogen content of the obtained nitrogen-doped hard carbon material is 6.75%, and the specific surface area is 52.1m 2 / g, the interlayer distance is 0.354nm.

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Abstract

The invention relates to a preparation method of a nitrogen-doped hard carbon material. The preparation method of the nitrogen-doped hard carbon material comprises the following steps: (1) carrying out acid pickling on plant resources, and then dipping the plant resources in a nitrogen-source aqueous solution to obtain a preform; and (2) carrying out heat treatment on the preform under a protective atmosphere to obtain the nitrogen-doped hard carbon material. The nitrogen-doped hard carbon material has a porous structure, nitrogen atoms are distributed in the hard carbon material and on the surface of the hard carbon material, the nitrogen content is 1-10wt%, and the specific surface area is smaller than 100 m<2>/g. The nitrogen doped hard carbon material has the characteristics that the capacity is high, the first-time coulombic efficiency is higher than 50%, the cycle performance is good, the rate capability is excellent and the like, the nitrogen-doped hard carbon material is used for the field of potassium ion battery cathode materials, the preparation process is simple, the performance is controllable, and the nitrogen-doped hard carbon material has universality and enlargingcapability.

Description

technical field [0001] The invention belongs to the technical field of hard carbon materials, and in particular relates to a nitrogen-doped hard carbon material, a preparation method thereof and a potassium ion battery used as a negative electrode. The nitrogen-doped hard carbon material is used in the field of potassium ion batteries. Background technique [0002] At present, lithium-ion batteries have been widely used commercially. However, limited lithium resources have made lithium-ion batteries unable to effectively meet the needs of power and large-scale energy storage. In recent years, many new alternative energy storage batteries have emerged and developed rapidly. , mainly including secondary batteries such as sodium ions, potassium ions, magnesium ions, and calcium ions. [0003] Potassium-ion batteries have many advantages as a new alternative energy storage battery. Potassium sources are abundant in the earth's crust and low in price; potassium-ion batteries are ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/054
CPCH01M4/364H01M4/38H01M4/625H01M10/054Y02E60/10
Inventor 王庆高成林罗绍华王志远张亚辉刘延国郝爱民
Owner 东北大学秦皇岛分校
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