Graphitized carbon foam supported carbon material/molybdenum carbide composite material, and preparation method and application thereof

A composite material and graphitized carbon technology, applied in the direction of carbon compounds, chemical instruments and methods, tungsten/molybdenum carbides, etc., can solve problems such as low catalytic conversion capacity, collapse and pulverization of positive electrode material structure, poor adsorption performance, etc. , to achieve high-efficiency adsorption and catalytic conversion, abundant active sites, and stable structure

Active Publication Date: 2020-02-18
SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] In view of the problems existing in the prior art, the present invention provides a graphitized carbon foam supported carbon material / molybdenum carbide composite material and its preparation method and application. The present invention constructs graphite with a three-dimensional hierarchical structure by adopting impregnation combined with high-temperature heat treatment methods. The carbon material / molybdenum carbide composite material supported by carbonized carbon foam is used as the carrier of sulfur, and the graphitized carbon foam skeleton provides enough space for the volume change of sulfur, which solves the problem of collapse and pulverization of the positive electrode material structure caused by the volume change of sulfur; at the same time Utilizing the synergistic effect between the components, the problems of poor adsorption performance and low catalytic conversion ability of the positive electrode for polysulfides in lithium-sulfur secondary batteries are solved, and efficient adsorption and catalytic conversion of polysulfides are realized.

Method used

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  • Graphitized carbon foam supported carbon material/molybdenum carbide composite material, and preparation method and application thereof
  • Graphitized carbon foam supported carbon material/molybdenum carbide composite material, and preparation method and application thereof
  • Graphitized carbon foam supported carbon material/molybdenum carbide composite material, and preparation method and application thereof

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Embodiment 1

[0069] This embodiment provides a preparation method of graphitized carbon foam supported carbon material / molybdenum carbide / sulfur composite positive electrode material, comprising the following steps:

[0070] (1) Ammonium molybdate solution is added in graphene oxide solution, the mass ratio of described ammonium molybdate and graphene oxide is 1:5; Stir, ultrasonic dispersion 120min, obtain the described graphene oxide dispersion that contains molybdenum metal ion Liquid, immerse polyurethane foam in it, keep 2h, the mass ratio of described polyurethane foam and graphene oxide is 1:1.2, and the mass ratio with ammonium molybdate is 1:1.1, after taking out, dry 24h at 80 ℃ of temperature, obtain Precursor materials;

[0071] (2) heat-treat the precursor material obtained in step (1), raise the temperature to 800° C. at a rate of 6° C. / min, and keep it warm for 12 hours to obtain the graphitized carbon foam-supported graphene oxide / molybdenum carbide composite material ;

...

Embodiment 2

[0075] This embodiment provides a preparation method of graphitized carbon foam supported carbon material / molybdenum carbide / sulfur composite positive electrode material, comprising the following steps:

[0076] (1) ammonium molybdate solution is added in graphene oxide solution, the mass ratio of described ammonium molybdate and graphene oxide is 1:1; Stir, ultrasonic dispersion 5min, obtain the described graphene oxide dispersion that contains molybdenum metal ion Liquid, immerse polyurethane foam into it, keep 1h, the mass ratio of described polyurethane foam and graphene oxide is 1:0.5, and the mass ratio with ammonium molybdate is 1:0.3, after taking out, dry at 25 ℃ temperature for 48h, obtain Precursor material;

[0077] (2) heat-treat the precursor material obtained in step (1), raise the temperature to 550° C. at a rate of 1° C. / min, and keep it warm for 24 hours to obtain the graphitized carbon foam-supported graphene oxide / molybdenum carbide composite material ;

...

Embodiment 3

[0081] This embodiment provides a preparation method of graphitized carbon foam supported carbon material / molybdenum carbide / sulfur composite positive electrode material, comprising the following steps:

[0082] (1) Sodium molybdate solution is added in the carbon nanotube solution, the mass ratio of described sodium molybdate and carbon nanotube is 1:10; Stir, ultrasonic dispersion 170min, obtain the described carbon nanotube dispersion that contains molybdenum metal ion Liquid, immerse phenolic foam into it, keep 48h, the mass ratio of described phenolic foam and carbon nanotube is 1:2, and the mass ratio with sodium molybdate is 1:2, after taking out, dry at 150 ℃ temperature for 0.5h, Obtain the precursor material;

[0083] (2) Heat-treat the precursor material obtained in step (1), raise the temperature to 1200° C. at a rate of 10° C. / min, and keep it warm for 1 hour to obtain the graphitized carbon foam-supported carbon nanotube / molybdenum carbide composite material ; ...

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Abstract

The invention relates to a graphitized carbon foam supported carbon material / molybdenum carbide composite material, and a preparation method and an application thereof. The composite material comprises a graphitized carbon foam skeleton and a carbon material / molybdenum carbide nanodot compound attached onto the graphitized carbon foam skeleton, and molybdenum carbide nanodots in the compound growon a carbon material in situ. The composite material is prepared by adopting a method of combining dipping with heat treatment, the molybdenum carbide nanodots are uniformly distributed on the carbonmaterial, rich active sites are provided, and the method is mild in condition, low in cost and good in dispersity. The invention further provides a graphitized carbon foam supported carbon material / molybdenum carbide / sulfur composite positive electrode material, efficient adsorption and catalytic conversion of polysulfide are realized, and the shuttle effect of the polysulfide is effectively eliminated. The graphitized carbon foam supported carbon material / molybdenum carbide composite material provided by the invention has a wide application prospect in the aspect of novel high-capacity lithium-sulfur batteries, and can be further applied to the field of other related electronic devices.

Description

technical field [0001] The invention relates to the fields of carbon-based composite material preparation and energy storage, in particular to a graphitized carbon foam-supported carbon material / molybdenum carbide composite material and its preparation method and application. Background technique [0002] With the rapid development of economy and society, energy and environmental problems have become increasingly serious, so it is particularly urgent to develop new green and recyclable energy storage systems. Lithium-sulfur battery with up to 1675mAh·g -1 Theoretical specific capacity and 2600Wh·Kg -1 The theoretical specific energy of the battery is equivalent to 3-5 times that of the currently commercialized secondary battery, and is considered to be one of the most promising next-generation lithium secondary batteries. However, during the charging and discharging process of lithium-sulfur batteries, the polysulfides in the intermediate valence state generated by sulfur ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B17/02C01B32/205C01B32/949H01M4/587H01M4/62H01M10/052B82Y30/00
CPCC01B32/205C01B32/949C01B17/02H01M4/587H01M4/625H01M10/052B82Y30/00C01P2004/64C01P2004/03C01P2004/80Y02E60/10
Inventor 程春牛树章石润黄润青
Owner SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
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