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A nitrogen-oxygen co-doped biomass hard carbon material and its preparation method and application

A biomass material and co-doping technology, applied in the field of electrochemical energy storage, can solve the problems of slow charge transport kinetics and stability, conductivity and potassium storage stability constraints, unfavorable large-scale application, etc., to achieve improved energy storage Potassium cycle performance and rate performance, the effect of improving electrochemical performance, increasing electrochemical active sites and widening the interlayer spacing

Active Publication Date: 2022-01-18
GUILIN UNIV OF ELECTRONIC TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, hard carbon materials have slow charge transport kinetics and poor stability of the internal structure, which seriously restricts their conductivity and potassium storage stability. The introduction of heteroatoms can increase the energy storage of hard carbon materials. Active sites to improve their charge transport capabilities. In order to obtain hard carbon materials that meet application requirements, most of the existing technologies use external nitrogen sources and complex synthesis processes, which are costly, time-consuming and labor-intensive, and are not conducive to large-scale applications.

Method used

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  • A nitrogen-oxygen co-doped biomass hard carbon material and its preparation method and application
  • A nitrogen-oxygen co-doped biomass hard carbon material and its preparation method and application
  • A nitrogen-oxygen co-doped biomass hard carbon material and its preparation method and application

Examples

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Effect test

Embodiment 1

[0029] A preparation method of nitrogen and oxygen co-doped biomass hard carbon material, comprising the following steps:

[0030] (1) Clean the mango core shell, place it in a vacuum drying oven for 12 hours at 80° C., and obtain the dried mango core shell;

[0031] (2) Utilize the pulverizer to pulverize the dried mango core-shell, and place it on a vibrating sieve to pass through a 300-mesh screen to obtain uniform mango core-shell powder, which is collected for use;

[0032] (3) Weigh 50g of powder and place it in a tube furnace, raise the temperature to 900°C at a rate of 3°C / min under an inert atmosphere and keep it warm for carbonization for 2 hours, and take it out when the temperature drops to 25°C to obtain nitrogen and oxygen co-doping Biomass hard carbon materials.

[0033] The nitrogen-oxygen co-doped biomass hard carbon material obtained in Example 1 was tested by X-ray photoelectron spectroscopy, the content of carbon element was 93.31wt%, the content of nitrog...

Embodiment 2

[0036] A preparation method of nitrogen and oxygen co-doped biomass hard carbon material, comprising the following steps:

[0037] (1) cleaning the mango core shell, placing it in a vacuum drying oven for 24 hours at 80° C. to obtain the dried mango core shell;

[0038] (2) Utilize the pulverizer to pulverize the dried mango core-shell, and place it on a vibrating sieve to pass through a 500-mesh screen to obtain uniform mango core-shell powder, which is collected for use;

[0039] (3) Weigh 50g of powder and place it in a tube furnace, raise the temperature to 1100°C at a heating rate of 5°C / min under an inert atmosphere and keep it warm for carbonization for 2 hours, take it out when the temperature drops to room temperature, and obtain the nitrogen-oxygen co-doped product. Material hard carbon material.

[0040] The nitrogen and oxygen co-doped biomass hard carbon material obtained in Example 2 was tested by X-ray photoelectron spectroscopy, the content of carbon element w...

Embodiment 3

[0043] (1) Clean the mango core shell, place it in a vacuum drying oven and dry it at 80°C for 10 hours to obtain the dried mango core shell;

[0044] (2) Utilize the pulverizer to pulverize the dried mango core-shell, and place it on a vibrating sieve to pass through a 1000-mesh screen to obtain uniform mango core-shell powder, which is collected for use;

[0045] (3) Weigh 50g of the powder and place it in a tube furnace, raise the temperature to 1300°C at a rate of 3°C / min under an inert atmosphere, keep it warm for carbonization for 2.5h, and take it out when the temperature drops to room temperature to obtain the final product.

[0046] The nitrogen-oxygen co-doped biomass hard carbon material obtained in Example 3 was tested by X-ray photoelectron spectroscopy, and the content of carbon element was 93.64wt%, the content of nitrogen element was 0.98wt%, and the content of oxygen element was 4.90wt% %, the content of calcium element is 0.48wt%.

[0047] The nitrogen and o...

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Abstract

The invention provides a nitrogen and oxygen co-doped biomass hard carbon material, including carbon, nitrogen, oxygen, and calcium. The total amount of the above four elements is 100wt%, and carbon accounts for 92-95%. Nitrogen accounts for 0.75‑2.10%, oxygen accounts for 4.0‑6.1%, and calcium accounts for 0.25‑0.80%. The preparation method includes: washing and drying the biomass material, pulverizing with a pulverizer, and sieving through a vibrating sieve to obtain biomass material powder, placing it in a tube furnace, performing sintering and carbonization under an inert atmosphere, and then cooling with the furnace to obtain the final product. The present invention rationally utilizes biomass waste, and the preparation method is simple and low in cost. The material is beneficial to the reversible deintercalation of potassium ions, thereby obtaining excellent electrochemical performance. The nitrogen and oxygen co-doped biomass hard carbon material prepared by the present invention is applied to In the prepared potassium ion battery and potassium ion hybrid capacitor, it has the advantages of high specific capacity, good rate performance and stable cycle performance.

Description

technical field [0001] The invention belongs to the technical field of electrochemical energy storage, and relates to a nitrogen-oxygen co-doped biomass hard carbon material and a preparation method and application thereof. Background technique [0002] Lithium-ion batteries have the advantages of high energy density, high voltage, and long service life. The trend has led to a surge in the price of lithium resources with limited reserves and uneven distribution, which greatly limits the further development of lithium-ion batteries. Therefore, people are committed to developing potassium-ion batteries with abundant reserves, low prices, and similar physical and chemical properties to lithium. Hybrid ionic capacitors (HICs), as the cross product of batteries and capacitors, combine the advantages of both, with the characteristics of high energy, high power, high density and long life, and are expected to show their talents in large-scale energy storage applications. [0003] ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G11/32H01G11/38H01G11/04H01G11/86C01B32/05
CPCH01G11/32H01G11/38H01G11/04H01G11/86C01B32/05Y02E60/13
Inventor 邓健秋黄凤彬王凤刘鹏姚青荣周怀营
Owner GUILIN UNIV OF ELECTRONIC TECH
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