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Nitrogen-doped carbon nanosphere as well as preparation method and application thereof

A nitrogen-doped carbon, nanosphere technology, applied in nanocarbon, nanotechnology, nanotechnology and other directions, can solve the problem of not effectively improving the shuttle effect of polyselenide, volume expansion selenium utilization, and the impact of sodium selenium battery electrochemical performance, etc. problems, achieving excellent comprehensive electrochemical performance, easy industrial scale-up, and alleviating volume changes.

Active Publication Date: 2022-02-22
FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, researchers have explored many selenium-carbon composite materials, such as carbon hollow spheres, carbon nanofibers, graphene, etc., but they still cannot effectively improve the shuttle effect, volume expansion, and selenium utilization of polyselenides, resulting in sodium selenium batteries. The electrochemical performance of the

Method used

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  • Nitrogen-doped carbon nanosphere as well as preparation method and application thereof
  • Nitrogen-doped carbon nanosphere as well as preparation method and application thereof
  • Nitrogen-doped carbon nanosphere as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0101] 1. Preparation of precursor solution;

[0102] At 30°C, add a certain amount of 3ml of ammonia water to a mixed solution of 10ml of deionized water and 75ml of ethanol, then add 6ml of tetraethyl orthosilicate, stir for 5 hours, then centrifuge and dry, and finally continue to dissolve the dried powder by ultrasonic Put it into water to form a colloidal silica solution with a concentration of 20mg / ml.

[0103] 2. Hydrothermal reaction;

[0104] Add 200μl acetic acid dropwise in 20ml water, then add 200mg chitosan powder to dissolve to obtain chitosan solution, then add 50mg hexadecyltrimethylammonium bromide and 10ml silica colloidal solution, stir for 30min evenly and put into high pressure The reactor was subjected to hydrothermal reaction at 180°C for 24h.

[0105] 3. Calcination process;

[0106] The product after the hydrothermal reaction was centrifuged and dried to obtain carbon nanospheres with a hierarchical multi-cavity hollow structure. After mixing it wit...

Embodiment 2

[0110] 1. Preparation of precursor solution;

[0111]At 30°C, add a certain amount of 3ml of ammonia water to a mixed solution of 10ml of deionized water and 75ml of ethanol, then add 6ml of tetraethyl orthosilicate, stir for 5 hours, then centrifuge and dry, and finally continue to dissolve the dried powder by ultrasonic Add it to water to form a colloidal silica solution with a concentration of 30mg / ml.

[0112] 2. Hydrothermal reaction;

[0113] Add 200μl acetic acid dropwise to 20ml water, then add 100mg chitosan powder to dissolve to obtain chitosan solution, then add 30mg hexadecyltrimethylammonium bromide and 10ml silica colloidal solution, stir for 30min evenly and put into high pressure The reactor was subjected to hydrothermal reaction at 160°C for 48h.

[0114] 3. Calcination process;

[0115] The product after the hydrothermal reaction was centrifuged and dried to obtain carbon nanospheres with a hierarchical multi-cavity hollow structure. After mixing them with...

Embodiment 3

[0119] 1. Preparation of precursor solution;

[0120] At 30°C, add a certain amount of 3ml of ammonia water to a mixed solution of 10ml of deionized water and 75ml of ethanol, then add 6ml of tetraethyl orthosilicate, stir for 5 hours, then centrifuge and dry, and finally continue to dissolve the dried powder by ultrasonic Add it to water to form a colloidal silica solution with a concentration of 10mg / ml.

[0121] 2. Hydrothermal reaction;

[0122] Add 200μl acetic acid dropwise to 20ml water, then add 100mg chitosan powder to dissolve to obtain chitosan solution, then add 20mg hexadecyltrimethylammonium bromide and 10ml silica colloidal solution, stir for 30min evenly and put into high pressure The reactor was subjected to hydrothermal reaction at 200°C for 36h.

[0123] 3. Calcination process;

[0124] The product after the hydrothermal reaction was centrifuged and dried to obtain carbon nanospheres with a hierarchical multi-cavity hollow structure. After mixing them wit...

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Abstract

The invention discloses a nitrogen-doped carbon nanosphere and a preparation method and application thereof. The nitrogen-doped carbon nanosphere has a hierarchical multi-cavity hollow structure. The hierarchical multi-cavity hollow structure contains macropores, mesopores and micropores. The preparation method comprises the following steps: acquiring a carbon nanosphere with a hierarchical multi-cavity hollow structure by combining high-temperature hydrothermal etching of silicon dioxide with a soft template method, and then carrying out carbonization and nitrogen doping on the obtained carbon nanosphere through high-temperature heat treatment so as to obtain the nitrogen-doped carbon nanosphere. As the nitrogen-doped carbon nanosphere has a relatively high specific surface area and a macroporous / mesoporous / microporous coexisting pore channel structure, when the nitrogen-doped carbon nanosphere is used for preparing a positive electrode material of a sodium-selenium battery, a high-content loaded selenium-carbon composite positive electrode material can be realized; and in addition, the rich nitrogen heteroatoms endow the electrode material with good conductivity, meanwhile, more active sites are provided for an electrochemical reaction, so the shuttle effect of polyselenide can be effectively inhibited, the transformation kinetics of the polyselenide is accelerated, and therefore, the sodium-selenium battery with excellent comprehensive performance is obtained.

Description

technical field [0001] The application relates to a nitrogen-doped carbon nanosphere and its preparation method and application, belonging to the field of energy storage materials. Background technique [0002] With the rapid development of electric vehicles and large-scale energy storage grid industries, the problem of insufficient lithium resources has become increasingly prominent; sodium-ion batteries have better advantages in the field of large-scale energy storage due to their rich sodium resources, low cost, and similar physical and chemical properties to lithium. Application prospect. However, traditional sodium-ion batteries use cathode materials with an embedded reaction mechanism, resulting in a very limited output specific energy density. Therefore, the development of new sodium-based secondary battery systems with low cost and high specific energy density has become a major issue in the development of large-scale energy storage in today's society. research focu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/15C01B19/02H01M4/62H01M10/054B82Y30/00B82Y40/00
CPCC01B32/15C01B19/02H01M4/628H01M4/625H01M10/054B82Y30/00B82Y40/00H01M2004/021H01M2004/028Y02E60/10
Inventor 胡翔温珍海
Owner FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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