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Hollow metal nitride/carbon microsphere composite material and preparation method and application thereof

A composite material and nitride technology, which is applied in the field of hollow metal nitride/carbon microsphere composite materials and its preparation, can solve the problems of large pore size of polyolefin diaphragm, sulfur volume expansion of lithium dendrites, and inability to suppress the shuttle effect. Achieve the effects of fast response, easy industrialization, and inhibition of shuttle effect

Pending Publication Date: 2021-08-24
SHANGHAI NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the application of lithium-sulfur batteries in practice is still limited by many problems, mainly including the following problems: the shuttle effect of lithium polysulfide intermediates, the poor conductivity of sulfur, the volume expansion of sulfur during lithiation, and the problem of lithium dendrites.
Commercial polyolefin separators have large pore sizes and cannot inhibit Li 2 S n Shuttle effect in lithium-sulfur batteries

Method used

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  • Hollow metal nitride/carbon microsphere composite material and preparation method and application thereof
  • Hollow metal nitride/carbon microsphere composite material and preparation method and application thereof
  • Hollow metal nitride/carbon microsphere composite material and preparation method and application thereof

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preparation example Construction

[0039] A method for preparing a hollow metal nitride / carbon microsphere composite material, comprising the following steps:

[0040] S1: Precursor preparation:

[0041] S11: mixing organic molecules containing amino groups, metal carbonyl compounds and organic solvents;

[0042] S12: Under the protection of inert gas, ultrasonic reaction;

[0043] S13: washing and drying to obtain the precursor;

[0044] S2: spray drying:

[0045] S21: Stir and melt the obtained precursor and phenol, then add water and formaldehyde solution;

[0046] S22: continue to stir and add NaOH to adjust the pH;

[0047] S23: adding ethanol and silicon dioxide nano-dispersion liquid, stirring evenly, spray drying, and collecting the obtained powder material;

[0048] S3: Calcining the obtained powder material under an inert gas atmosphere, collecting the material after natural cooling, etching the material with an aqueous sodium hydroxide solution, washing and drying to obtain the hollow metal nitr...

Embodiment 1

[0069] Add 5g of melamine, 2g of molybdenum carbonyl and 40mL of n-hexadecane into the flask and stir; then ultrasonically react at 80°C for 4h under argon; wash with n-pentane for 4 to 5 times, and bake at 105°C for 12h to obtain the precursor; Precursor The precursor and 2.5g of phenol were stirred and melted at 40°C. Add 20mL water and 20mL formaldehyde solution, then add 1M sodium hydroxide solution to adjust the pH=9, continue stirring for 1h, then add 35mL ethanol and 15g 20wt% SiO 2 / EtOH silica dispersion liquid with a size of 10nm, stirred for 15min, and spray-dried at 200°C to obtain the material; the obtained material was calcined at high temperature under an argon atmosphere with a heating rate of 10°Cmin -1 , roasted at 500°C for 5 hours, roasted at 900°C for 2 hours, and the material obtained after natural cooling was etched with 5M sodium hydroxide solution for 3 to 4 times, then washed with deionized water for 3 to 4 times, and finally air-dried at 80°C for 12 ...

Embodiment 2

[0071] Add 5g of melamine, 3g of molybdenum carbonyl and 40mL of n-hexadecane into the flask and stir; then ultrasonically react at 80°C for 4h under argon; wash with n-pentane for 4 to 5 times, and dry at 105°C for 12h to obtain the precursor; Precursor The precursor and 2.5g of phenol were stirred and melted at 40°C. Add 20mL water and 20mL formaldehyde solution, then add 1M sodium hydroxide solution to adjust the pH=9, continue stirring for 1h, then add 35mL ethanol and 15g 20wt% SiO 2 / EtOH silica dispersion liquid with a size of 10nm, stirred for 15min, and spray-dried at 200°C to obtain the material; the obtained material was calcined at high temperature under an argon atmosphere with a heating rate of 10°Cmin -1 , roasted at 500°C for 5 hours, roasted at 900°C for 2 hours, and the material obtained after natural cooling was etched with 5M sodium hydroxide solution for 3 to 4 times, then washed with deionized water for 3 to 4 times, and finally air-dried at 80°C for 12 h...

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Abstract

The invention relates to a hollow metal nitride / carbon microsphere composite material and a preparation method and application thereof. The preparation method comprises the following steps: mixing and stirring amino-containing organic molecules, a metal carbonyl compound and an organic solvent; carrying out ultrasonic reaction under the protection of inert gas; washing and drying to obtain a precursor; stirring and melting the mixture and phenol, and then adding water and a formaldehyde solution; continuously stirring and adding NaOH to adjust the pH value; adding ethanol and a silicon dioxide nano dispersion liquid, uniformly stirring, performing spray drying, and collecting an obtained powder material; and roasting in an inert gas atmosphere, naturally cooling, etching with a sodium hydroxide aqueous solution, and then washing and drying to obtain a target product. Compared with the prior art, explosive ammonia gas does not need to be used as a nitrogen source, and the material has the advantages of high production efficiency, high yield, easiness in industrialization and the like; through testing, the lithium-sulfur battery assembled by the material as a sulfur positive electrode carrier and a diaphragm modification layer has relatively high capacity cycling stability and a wide application prospect.

Description

technical field [0001] The invention belongs to the technical field of nanomaterial synthesis and relates to the modification of lithium-sulfur battery diaphragms, in particular to a hollow metal nitride / carbon microsphere composite material and its preparation method and application. Background technique [0002] Lithium-sulfur batteries are expected to become the next generation of energy storage and power secondary batteries due to their high capacity, low cost and environmental friendliness. However, the practical application of lithium-sulfur batteries is still subject to many limitations, mainly including the following problems: the shuttle effect of lithium polysulfide intermediates, the poor conductivity of sulfur, the volume expansion of sulfur during lithiation, and the problem of lithium dendrites. Among them, the shuttle effect of lithium polysulfide is the main problem hindering the development of lithium-sulfur battery cathode. Separators are an important part...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B21/06C01B32/05H01M4/62H01M50/431H01M10/052B82Y30/00B82Y40/00
CPCC01B21/062C01B32/05H01M4/628H01M10/052B82Y30/00B82Y40/00C01P2002/72C01P2004/04C01P2006/40Y02E60/10
Inventor 刘肖燕王雪薇杨梦华吴金凤李和兴
Owner SHANGHAI NORMAL UNIVERSITY
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