Nitrogen-doped carbon-coated molybdenum selenide/graphene core-shell array sandwich structure composite material, preparation method and application thereof

A nitrogen-doped carbon, sandwich structure technology, used in structural parts, electrical components, battery electrodes, etc., to achieve high rate performance, excellent rate performance, and high cycle stability.

Active Publication Date: 2016-08-31
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the above methods can improve MoSe to a certain extent 2 As the electrochemical performance of sodium ion negative electrode, but its electrochemical performance such as reversible capacity and rate performance is still far from industrial application, and needs to be improved

Method used

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  • Nitrogen-doped carbon-coated molybdenum selenide/graphene core-shell array sandwich structure composite material, preparation method and application thereof
  • Nitrogen-doped carbon-coated molybdenum selenide/graphene core-shell array sandwich structure composite material, preparation method and application thereof
  • Nitrogen-doped carbon-coated molybdenum selenide/graphene core-shell array sandwich structure composite material, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] (1) Disperse and dissolve 4mmol of selenium powder in 10mL of hydrazine hydrate, and stir for 30min at room temperature 25℃ to form a wine-red solution A. The concentration of selenium in solution A is 0.4mmolmL -1 ;

[0038] (2) Dissolve 2mmol of sodium molybdate dihydrate in 60mL of deionized water to form solution B. The concentration of sodium molybdate in solution B is 0.33mmolmL -1 ;

[0039] (3) Take 10mL of solution A and 60mL of solution B, mix and stir evenly, transfer to the reactor, and then place 5×5cm vertical graphene (VG) collector material grown on carbon cloth in it, 200℃ water Thermal reaction for 24 hours, washing and drying to obtain VG-MoSe 2 Core-shell array structure;

[0040] (4) Weigh 0.2g of dopamine hydrochloride and dissolve it in 30mL deionized water to form a solution, and then add VG-MoSe 2 The core-shell array structure is immersed in it, polymerized in a water bath at 80°C for 24 hours, washed and dried to obtain a core-shell array composite m...

Embodiment 2

[0048] (1) Disperse and dissolve 3mmol of selenium powder in 10mL of hydrazine hydrate, and stir for 30min at room temperature 25℃ to form a wine-red solution A. The concentration of selenium in solution A is 0.3mmolmL -1 ;

[0049] (2) Dissolve 1.5mmol of sodium molybdate dihydrate in 50mL of deionized water to form solution B. The concentration of sodium molybdate in solution B is 0.03mmolmL -1 ;

[0050] (3) Take 10mL of solution A and 50mL of solution B, mix and stir evenly, transfer to the reactor, and then place 3×3cm vertical graphene (VG) collector material grown on carbon cloth in it, 200℃ water Heat reaction for 16 hours, wash and dry to obtain VG-MoSe 2 Core-shell array structure;

[0051] (4) Weigh 0.15g of dopamine hydrochloride and dissolve it in 30mL deionized water to form a solution, and then add VG-MoSe 2 The core-shell array structure is immersed in it, polymerized in a water bath at 80°C for 18 hours, washed and dried to obtain a core-shell array composite materia...

Embodiment 3

[0057] (1) Disperse and dissolve 6mmol of selenium powder in 10mL of hydrazine hydrate, and stir for 30min at room temperature to form a wine-red solution A. The concentration of selenium in solution A is 0.6mmolmL -1 ;

[0058] (2) Dissolve 3mmol of sodium molybdate dihydrate in 60mL of deionized water to form solution B. The concentration of sodium molybdate in solution B is 0.05mmolmL -1 ;

[0059] (3) Take 10mL of solution A and 60mL of solution B, mix and stir them evenly, transfer them to the reactor, and then place the 6×6cm vertical graphene (VG) collector material grown on carbon cloth in it, 200℃ water Thermal reaction for 12 hours, washing and drying to obtain VG-MoSe 2 Core-shell array structure;

[0060] (4) Weigh 0.3g of dopamine hydrochloride and dissolve it in 30mL deionized water to form a solution, and then add VG-MoSe 2 The core-shell array structure is immersed in it, polymerized in a water bath at 80°C for 12 hours, washed and dried to obtain a core-shell array c...

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Abstract

The invention discloses a nitrogen-doped carbon-coated molybdenum selenide/graphene core-shell array sandwich structure composite material, a preparation method and application thereof. The method includes: dissolving selenium powder in hydrazine hydrate to form a solution A; dissolving a sodium molybdate dehydrate solution in water to form a solution B; mixing the solutions to form a reaction solution, placing a vertical grapheme collector electrode material growing on a carbon cloth in the reaction solution to carry out hydrothermal reaction, and then conducting washing and drying to obtain a VG-MoSe2 core-shell array structure; dissolving dopamine hydrochloride in water, then soaking the VG-MoSe2 core-shell array structure in the dopamine hydrochloride aqueous solution, carrying out water bath polymerization, and performing washing drying; and carbonizing the dopamine polymerized core-shell array structure under high temperature condition in protective atmosphere, thus obtaining the nitrogen-doped carbon-coated molybdenum selenide/graphene core-shell array sandwich structure composite material. When used as a sodium ion negative electrode material, the constructed composite material has high reversible charge-discharge capacity, long cycle life and excellent rate performance.

Description

Technical field [0001] The invention relates to the technical field of sodium ion battery negative electrode materials, in particular to a composite material with a sandwich structure of nitrogen-doped carbon coated molybdenum selenide / graphene core-shell array, a preparation method thereof, and application as a sodium ion battery negative electrode material. Background technique [0002] Energy crisis and environmental problems are the two major challenges facing human society. The development of clean and renewable new energy sources has become an urgent need in today's society. Among the current various new energy technologies, lithium-ion secondary batteries have quickly occupied the portable electronics market due to their advantages of high energy density, high working voltage, and environmental friendliness, and have become the primary choice for electric vehicles and large-scale energy storage systems. However, due to the limited and uneven distribution of lithium resourc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62
CPCH01M4/62H01M4/625Y02E60/10
Inventor 夏新辉谢东王秀丽涂江平
Owner ZHEJIANG UNIV
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