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Polypyrrole coated MoS2/C composite material and preparation method thereof

A technology of composite materials and polypyrrole, which is applied in the direction of nanotechnology for materials and surface science, active material electrodes, nanotechnology, etc., can solve problems such as complex process and insufficient environmental protection

Active Publication Date: 2021-05-11
GUANGXI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this document first prepared solid molybdenum disulfide nanospheres by hydrothermal method, and then used weak alkaline etching method to convert solid nanospheres into hollow structures, and then went through a hydrothermal process to obtain carbon-coated egg yolk shells. -like MoS 2 / C, after two hydrothermal methods, the process is more complicated and not environmentally friendly
[0004] Polypyrrole-coated MoS with a hollow spherical structure has not been seen so far 2 Related reports on / C composite materials and their preparation methods

Method used

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  • Polypyrrole coated MoS2/C composite material and preparation method thereof
  • Polypyrrole coated MoS2/C composite material and preparation method thereof
  • Polypyrrole coated MoS2/C composite material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0035] 1) Prepared from MoS 2 / C assembled hollow nanospheres: Weigh 0.24g sodium molybdate dihydrate and 0.18g thiourea and dissolve them in 40mL ethanol, add 0.1g polyvinylpyrrolidone (average molecular weight is 8000), stir for 12h (the system is a milky white suspension ) and then transferred to a 100 ml polytetrafluoroethylene liner, sealed the liner and placed it in an autoclave, heated to 230° C. to keep the reaction for 42 hours. After the autoclave was cooled, the hollow nanospheres were collected, washed alternately with ethanol and deionized water for 5 times, then dried in a vacuum oven at 70 °C for 12 h, and annealed at 800 °C for 2 hours in argon to obtain MoS 2 / C assembled hollow nanospheres. The resulting MoS was characterized by scanning electron microscopy 2 / C assembled hollow nanosphere surface morphology, such as figure 1 shown. Among them, such as figure 1 As shown in (a) and 1(b), the prepared MoS 2 The / C hollow nanosphere has a uniform size, the...

Embodiment 2

[0054] Repeat Example 1, the difference is:

[0055] In step 1), the amount of ethanol was changed to 50mL, the amount of polyvinylpyrrolidone was changed to 0.024g, and the reaction was changed to 200°C for 30h of heat preservation;

[0056] In step 2), FeCl 3 The dosage is changed by MoS 2 / C 5% of the mass of the assembled hollow nanospheres.

[0057] The resulting composite material was characterized by scanning electron microscopy and transmission electron microscopy, and it was determined to be polypyrrole-coated MoS with a hollow spherical structure. 2 / C Composite.

Embodiment 3

[0059] Repeat Example 1, the difference is:

[0060] In step 1), polyvinylpyrrolidone with an average molecular weight of 10,000 is used instead of polyvinylpyrrolidone with an average molecular weight of 8,000, and the reaction is changed to 150°C for 50 hours of heat preservation;

[0061] In step 2), FeCl 3 The dosage is changed by MoS 2 15% of the mass of the assembled hollow nanospheres at / C, the reaction was changed to 60° C. for 5 h.

[0062] The resulting composite material was characterized by scanning electron microscopy and transmission electron microscopy, and it was determined to be polypyrrole-coated MoS with a hollow spherical structure. 2 / C Composite.

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Abstract

The invention discloses a polypyrrole coated MoS2 / C composite material and a preparation method thereof. The preparation method of the composite material comprises the following steps: 1), dissolving sodium molybdate dehydrate and thiourea in ethanol, then adding polyvinylpyrrolidone, uniformly performing stirring, then putting the mixture into a high-pressure kettle, and carrying out heat preservation reaction at the temperature of greater than or equal to 150 DEG C to obtain hollow nanospheres assembled by MoS2 / C; and 2), uniformly mixing the hollow nanospheres assembled by MoS2 / C with an oxidizing agent, taking the obtained mixture as a raw material, taking pyrrole as a coating source, taking a high-pressure kettle as a reaction chamber, and carrying out heat preservation reaction under a heating or non-heating condition under the condition that the mixture and pyrrole are not in contact with each other, thereby obtaining a polypyrrole coated MoS2 / C composite material. The composite material is in a hollow spherical shape and has excellent Li<+> storage performance and reversible capacity, and the preparation method is simpler and more environmentally friendly.

Description

technical field [0001] The invention relates to anode materials for lithium ion batteries, in particular to a polypyrrole-coated MoS 2 / C composite material and its preparation method. Background technique [0002] In recent years, layered molybdenum disulfide (MoS 2 ) have attracted a lot of interest and attention due to their unique chemical and physical properties. MoS 2 As an electrode material, it has a high specific capacity, so it is considered to be a very promising anode material for lithium batteries. MoS 2 The layer spacing is relatively large, 0.62nm, which is comparable to that of traditional graphite (372mAh g -1 ) compared to MoS 2 Although it can accommodate more lithium ions, it has a higher lithium storage capacity (669mAh g -1 ), but it still has disadvantages such as poor electrical conductivity, severe volume expansion, rapid degradation of cycle performance, and poor electrochemical performance, which hinder the development of MoS 2 Further deve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/583H01M4/60H01M10/0525B82Y30/00
CPCH01M4/366H01M4/5815H01M4/583H01M4/602H01M10/0525B82Y30/00H01M2004/027Y02E60/10
Inventor 黄清高忠贵孔文婕刘富池
Owner GUANGXI NORMAL UNIV
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