Preparation method of hollow carbon spheres with through mesopores and composite sodium metal negative electrode of hollow carbon spheres

A sodium metal, hollow technology, applied in the preparation/purification of carbon, negative electrodes, battery electrodes, etc., can solve the problems of unstable interface film between sodium metal electrodes and electrolytes, limiting the commercialization of sodium metal batteries, and destroying battery structures. To achieve the effect of being conducive to efficient transport, reducing nucleation overpotential, and reducing side reactions

Pending Publication Date: 2022-04-19
江苏众钠能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when pure Na metal is used as the anode material, there are three main problems: (1) The uneven deposition can lead to the malignant growth of Na dendrites, which can pierce the battery separator during charge and discharge, causing short circuits. , causing fire, explosion and other safety issues; (2) sodium metal will cause a large volume expansion during the deposition / stripping process, which will destroy the battery structure and cause battery failure; (3) the instability of the sodium metal electrode and electrolyte interface film , will lead to a large number of side reactions, and the dendrites may break during the recycling process to form "dead sodium", which will lead to rapid loss of active materials and cause serious attenuation of battery capacity.
These are the key issues limiting the commercialization of Na metal batteries and urgently need to be resolved

Method used

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  • Preparation method of hollow carbon spheres with through mesopores and composite sodium metal negative electrode of hollow carbon spheres
  • Preparation method of hollow carbon spheres with through mesopores and composite sodium metal negative electrode of hollow carbon spheres
  • Preparation method of hollow carbon spheres with through mesopores and composite sodium metal negative electrode of hollow carbon spheres

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Experimental program
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Effect test

Embodiment 1

[0038] This example is used to illustrate the preparation method of the hollow carbon spheres provided by the present invention with a through-hole mesoporous structure, specifically as follows:

[0039] S1. Add 7 mL of tetrapropyl orthosilicate (TPOS) to a mixed solution of 70 mL of ethanol, 10 mL of deionized water and 3 mL of ammonia water (25% by mass), and then react with magnetic stirring in a water bath at 30°C for 30 minutes;

[0040] S2. Add 0.4g resorcinol and 0.56mL formaldehyde in turn, magnetically stir for 24 hours, centrifuge the sample, and then wash the obtained solid by deionized water / deionized water / ethanol for three times. After collecting the sample, put it in a 60°C oven Drying in medium temperature for 12h, the silica ball SiO2 coated with phenolic resin was obtained. 2 @RF.

[0041] S3, put the above-mentioned sample into the quartz boat after being ground, place the middle part of the hearth of the tube furnace, and use N 2 As an inert gas source, h...

Embodiment 2

[0048] This example is used to illustrate the preparation method of the hollow carbon spheres provided by the present invention with a through-hole mesoporous structure, specifically as follows:

[0049] S1. Add 3 mL of tetrapropyl orthosilicate (TPOS) to a mixed solution of 70 mL of ethanol, 10 mL of deionized water and 3 mL of ammonia water (25% by mass), and then react with magnetic stirring in a water bath at 30°C for 5 minutes;

[0050] S2. Continue to add 0.4g resorcinol and 0.56mL formaldehyde in sequence, magnetically stir the reaction for 24h, centrifuge, and then wash the obtained solid by deionized water / deionized water / ethanol for three times, collect samples, and put them in an oven at 60°C Drying in medium temperature for 12h, the silica ball SiO2 coated with phenolic resin was obtained. 2 @RF.

[0051] S3, put the above-mentioned sample into the quartz boat after being ground, place the middle part of the hearth of the tube furnace, and use N 2 As an inert gas...

Embodiment 3

[0054] This example is used to illustrate the preparation method of the hollow carbon spheres provided by the present invention with a through-hole mesoporous structure, specifically as follows:

[0055] S1. Add 7 mL of tetrapropyl orthosilicate (TPOS) to a mixed solution of 70 mL of ethanol, 10 mL of deionized water and 3 mL of ammonia water (25% by mass), and then react with magnetic stirring in a water bath at 30°C for 30 minutes;

[0056] S2. Continue to add 0.4g resorcinol and 0.56mL formaldehyde in sequence, magnetically stir the reaction for 24h, centrifuge, and then wash the obtained solid by deionized water / deionized water / ethanol for three times, collect samples, and put them in an oven at 60°C Drying in medium temperature for 12h, the silica ball SiO2 coated with phenolic resin was obtained. 2 @RF.

[0057] S3, put the above-mentioned sample into the quartz boat after being ground, place the middle part of the hearth of the tube furnace, and use N 2 As an inert ga...

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Abstract

The invention relates to a preparation method of hollow carbon spheres with through mesopores and a composite sodium metal negative electrode thereof, tetrapropyl orthosilicate, ammonia water, ethanol, deionized water, formaldehyde and resorcinol are used as raw materials, the steps of silicon source decomposition, phenolic resin polymerization, carbonization, etching and the like are performed, the obtained hollow carbon spheres have larger cavities, and the carbon shells have obvious through mesoporous structures. When the hollow carbon sphere with the through mesoporous structure provided by the invention is used for a sodium metal battery negative electrode material, nano packaging of sodium metal can be efficiently realized, so that generation of sodium dendrites is inhibited, volume change in a sodium metal deposition/stripping process is limited, an interfacial film is stabilized, and the hollow carbon sphere can be used as an ideal carbon-based current collector material of a sodium metal negative electrode; further, the method is used for constructing a safe sodium metal battery with high coulombic efficiency and long service life.

Description

technical field [0001] The invention relates to the technical field of electrode materials for sodium metal batteries, in particular to a method for preparing hollow carbon spheres with through mesopores and a composite sodium metal negative electrode thereof. Background technique [0002] In order to combat climate change and reduce carbon emissions, rechargeable batteries, as a key technology for energy storage, play a key role. After more than 30 years of development, lithium batteries have become a necessity in our society. However, in nature, the reserves of lithium resources are seriously insufficient (only 0.0017wt% in the earth's crust), and the distribution of storage areas is obviously uneven, which severely limits the further development of lithium batteries, making them less able to meet the rapidly increasing energy demand of society. Therefore, it is imperative to develop a new battery system. Among many new battery systems, because sodium is very rich in sto...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/05H01M4/583H01M10/054
CPCC01B32/05H01M4/583H01M10/054H01M2004/027Y02E60/10
Inventor 王鸣生叶伟彬刘伟成
Owner 江苏众钠能源科技有限公司
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