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Monatomic molybdenum dispersed molybdenum-nitrogen-carbon nanosheet material as well as preparation and application thereof

A technology of carbon nanosheets and atomic dispersion, applied in structural parts, electrical components, battery electrodes, etc., can solve problems such as poor conductivity, low capacity, poor rate and cycle performance

Inactive Publication Date: 2020-10-27
HUAZHONG UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of the above defects or improvement needs of the prior art, the present invention provides a monoatomic molybdenum-dispersed molybdenum-nitrogen-carbon nanosheet material, its preparation and application, which is obtained by coating the silicon dioxide-coated graphene oxide nanosheet The material is mixed with nitrogen and carbon sources and molybdenum salts. When the initiator triggers the polymerization of the nitrogen and carbon sources, the hydrogen bond and electrostatic attraction between the molybdenum salt and the polymer are used to atomically support the metal molybdenum on the surface of the nanosheet material, and then The polymer is carbonized by heat treatment, and finally the silicon dioxide is removed to obtain the single-atom molybdenum-dispersed molybdenum-nitrogen-carbon porous nanosheet material, which is further used to prepare the cathode material of lithium-sulfur batteries to solve the existing lithium-sulfur batteries. The technical problems of poor conductivity, low capacity, poor rate and cycle performance of positive electrode materials

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  • Monatomic molybdenum dispersed molybdenum-nitrogen-carbon nanosheet material as well as preparation and application thereof
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  • Monatomic molybdenum dispersed molybdenum-nitrogen-carbon nanosheet material as well as preparation and application thereof

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preparation example Construction

[0041] The preparation method of the molybdenum-nitrogen-carbon nano sheet material that a kind of monoatomic molybdenum is dispersed provided by the invention comprises the following steps:

[0042] (1) Under acidic conditions, molybdenum salt and initiator are added to the mixed system of the aqueous dispersion of the carbon material precursor and the nitrogen-carbon source, so that the nitrogen-carbon source undergoes a polymerization reaction under the action of the initiator, and simultaneously reacts with the The molybdenum salt interacts through hydrogen bonding and electrostatic attraction; wherein the carbon material precursor is a graphene oxide material coated with silicon dioxide, and silicon dioxide is coated on the outer surface of the graphene oxide sheet material; The nitrogen and carbon source undergoes a polymerization reaction on the surface of the carbon material precursor, and is further combined with the molybdenum salt through hydrogen bonding and electro...

Embodiment 1

[0073] A two-dimensional molybdenum-nitrogen-carbon nanosheet material dispersed with monoatomic molybdenum is prepared according to the following method:

[0074] (1) Add 6 mL of graphene oxide solution (3 mg / mL) to 44 mL of water and 350 mL of ethanol solution while stirring. Afterwards, 0.6 g of polyvinylpyrrolidone (K27), 14 ml of tetraethyl orthosilicate and 11 ml of concentrated ammonia water were successively introduced, and after stirring for 12 hours, it was centrifuged and washed twice with deionized water to obtain silica-coated Graphene.

[0075] (2) The silica-coated graphene oxide was then dispersed in 300 ml of deionized water. 4 mL of concentrated HCl and 4 mL of aniline were added to the resulting suspension, followed by constant stirring in an ice bath and keeping the temperature below 5°C. The ammonium heptamolybdate solution and 1 g of ammonium persulfate were then dropped into the dispersion. The molar ratio of aniline / molybdenum is 4:1. After continuou...

Embodiment 2

[0086] A two-dimensional molybdenum-nitrogen-carbon nanosheet material dispersed with monoatomic molybdenum is prepared according to the following method:

[0087] (1) Add 6 mL of graphene oxide solution (3 mg / mL) to 44 mL of water and 350 mL of ethanol solution while stirring. Afterwards, 0.6 g of polyvinylpyrrolidone (K27), 14 ml of tetraethyl orthosilicate and 11 ml of concentrated ammonia water were successively introduced, and after stirring for 12 hours, it was centrifuged and washed twice with deionized water to obtain silica-coated Graphene.

[0088] (2) The silica-coated graphene oxide was then dispersed in 300 ml of deionized water. 4 mL of concentrated HCl and 4 mL of aniline were added to the resulting suspension, followed by constant stirring in an ice bath and keeping the temperature below 5°C. The ammonium heptamolybdate solution and 1 g of ammonium persulfate were then dropped into the dispersion. The molar ratio of aniline / molybdenum is 8:1. After continuou...

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Abstract

The invention belongs to the field of energy materials, and more particularly relates to a monatomic molybdenum dispersed molybdenum-nitrogen-carbon nanosheet material as well as preparation and application thereof. The preparation method comprises the steps of adding molybdenum salt and an initiator into a mixed system of an aqueous dispersion of a carbon material precursor and a nitrogen-carbonsource under an acidic condition so as to enable the nitrogen-carbon source to be subjected to polymerization reaction under the initiation action of the initiator and interact with the molybdenum salt through hydrogen bonds and electrostatic attraction at the same time; and then carbonizing the polymer through heat treatment, and finally removing silicon dioxide to obtain the monatomic molybdenumdispersed molybdenum-nitrogen-carbon porous nanosheet material. The monatomic molybdenum dispersed molybdenum-nitrogen-carbon material prepared by the method has relatively high conductivity and specific surface area; the unique Mo-N two-coordinated Mo-N2 / C structure active site and the polysulfide ions have strong adsorption and interaction, so that the migration of polysulfide ions is inhibited, the conversion rate of the polysulfide ions is remarkably improved, and the multiplying power and the circularity of a lithium-sulfur battery can be effectively improved.

Description

technical field [0001] The invention belongs to the field of energy materials, and more specifically relates to a monoatomic molybdenum-dispersed molybdenum-nitrogen-carbon nano sheet material, its preparation and application. Background technique [0002] Lithium-sulfur batteries with high theoretical capacity (1675 mAh / g) and energy density (2600 Wh / kg) are considered to be strong candidates for next-generation energy storage devices. However, several unresolved issues hinder the practical application of lithium-sulfur batteries. These problems are summarized as follows: (1) The low conductivity of sulfur and the discharge product lithium sulfide makes it difficult to transport electrons during battery operation, delaying the S 8 / Li 2 The redox reaction rate between S makes the utilization rate of sulfur in the lithium-sulfur battery lower; (2) the low lithium ion transmission rate further reduces the rate of the battery reaction; (3) the slow polysulfide ion conversion...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M10/052
CPCH01M4/624H01M4/625H01M4/628H01M10/052Y02E60/10
Inventor 李箐马峰王谭源
Owner HUAZHONG UNIV OF SCI & TECH
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