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MoS2-xOx/carbon negative electrode material and preparation method thereof

A carbon negative electrode material, mos2-xox technology, applied in battery electrodes, electrical components, electrochemical generators, etc., to achieve the effects of improving energy and cycle performance, increasing specific capacity, and improving volume change

Active Publication Date: 2017-11-10
CHINA THREE GORGES UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the research level of pure molybdenum sulfide is mature. However, this also puts forward higher requirements for the preparation and application of molybdenum sulfide nanomaterials, making pure molybdenum sulfide unable to meet the current needs. Therefore, new carrier materials are sought Or the material of the modified active component is of great significance. Graphene has the characteristics of large specific surface area, high electrical conductivity and thermal stability, which can significantly improve the electrochemical performance of the material.

Method used

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  • MoS2-xOx/carbon negative electrode material and preparation method thereof
  • MoS2-xOx/carbon negative electrode material and preparation method thereof
  • MoS2-xOx/carbon negative electrode material and preparation method thereof

Examples

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Effect test

Embodiment 1

[0018] Embodiment 1: A kind of MoS 1.9 o 0.1 / Carbon negative electrode material and preparation method thereof

[0019] Wet paper towel in 1 mol L -1 Soak in dilute hydrochloric acid for 12 hours, then transfer the wet paper towel to a mixed solution of absolute ethanol / acetone with a volume ratio of 1:1 and soak for 6 hours, then wash the obtained wet paper towel with absolute ethanol and deionized water for 3-5 times , and then placed in a drying oven at 60° C. for 12 hours to obtain a treated wet tissue. Take concentration 12 mg mL -1 10mL of graphene oxide was evenly coated on the surface of 0.1g wet paper towel, dried, and then placed in a hydrothermal kettle with 0.24g sodium molybdate and 0.76g thiourea for 24 hours at 200°C. Formation of MoS from sodium molybdate and thiourea during hydrothermal process 2 , graphene oxide reduction. The material was calcined in a tube furnace at 800° C. for 4 hours, and the crystallinity and carbonization degree of the material ...

Embodiment 2

[0020] Example 2 is a kind of MoS 1.8 o 0.2 / Carbon negative electrode material and its preparation method Ⅱ

[0021] Wet paper towel in 1 mol L -1 Soak in dilute hydrochloric acid for 12 hours, then transfer the wet paper towel to a mixed solution of absolute ethanol / acetone with a volume ratio of 1:1 and soak for 6 hours, then wash the obtained wet paper towel with absolute ethanol and deionized water for 3-5 times , and then placed in a drying oven at 60° C. for 12 hours to obtain a treated wet tissue. Take concentration 12 mg mL -1 10 mL of graphene oxide was uniformly coated on the surface of 0.1g wet paper towel, dried, and then put it in a hydrothermal kettle with 0.24g sodium molybdate and 0.76g thiourea for 24 hours at 200°C. Formation of MoS from sodium molybdate and thiourea during hydrothermal process 2 , graphene oxide reduction. The material was calcined in a tube furnace at 800°C for 4h. While calcining, the crystallinity and carbonization degree of the m...

Embodiment 3

[0022] Example 3 A kind of MoS 1.7 o 0.3 / Carbon negative electrode material and its preparation method Ⅲ

[0023] Wet paper towel in 1 mol L -1 Soak in dilute hydrochloric acid for 12 hours, then transfer the wet paper towel to a mixed solution of absolute ethanol / acetone with a volume ratio of 1:1 and soak for 6 hours, then wash the obtained wet paper towel with absolute ethanol and deionized water for 3-5 times , and then placed in a drying oven at 60° C. for 12 hours to obtain a treated wet tissue. Take concentration 12 mg ml -1 10ml of graphene oxide was uniformly coated on the surface of 0.1g wet paper towel, dried, and then placed in a hydrothermal kettle with 0.24g sodium molybdate and 0.76g thiourea for 24 hours at 200°C. Formation of MoS from sodium molybdate and thiourea during hydrothermal process 2 , graphene oxide reduction. The material was calcined in a tube furnace at 800°C for 4h. While calcining, the crystallinity and carbonization degree of the material...

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Abstract

The invention discloses a MoS2-xOx / carbon negative electrode material and a preparation method thereof, and belongs to the field of electrochemistry and new energy materials. According to the MoS2-xOx / carbon negative electrode material disclosed by the invention, treated wet paper towels are soaked in a graphene oxide solution, hydrothermal treatment is carried out on the dried paper towels and a mixed solution of sodium molybdate and thiourea, the sodium molybdate and the thiourea form MoS2, and the graphene oxide is reduced. The obtained material is calcined in a high temperature inert atmosphere after the hydrothermal treatment to improve the crystallinity and the carbonization degree of the MoS2 and further reduce the graphene oxide to obtain a MoS2 / carbon composite material. The MoS2 / carbon composite material is subsequently calcined in oxygen at a low temperature to form the MoS2-xOx / carbon negative electrode material, and oxygen atoms partially substitute sulfur atoms, thereby resulting in MoS2 lattice defects, increasing the carrier concentration and improving the conductivity of the material. The carbon forms a three-dimensional conductive network in the material, and the graphene has high conductivity, a large surface area and physical and chemical stability, and meanwhile improves the cycling stability of the material in the process of embedded lithium release. Serving as a lithium ion battery negative electrode material, the MoS2-xOx / carbon negative electrode material obviously improves the reversible specific capacity of the material.

Description

technical field [0001] The invention discloses a MoS 2-x o x A carbon negative electrode material and a preparation method thereof belong to the field of electrochemistry and new energy materials. Background technique [0002] It is well known that pollution-free and low-cost materials are of great value to the future society along with the consumption of fuel and the demand for a large amount of energy. Lithium-ion batteries are widely used in portable electronic devices and electric vehicles due to their large energy density and long cycle life, thus reducing the consumption of chemical dyes to some extent. [0003] Among the transition group compounds, especially molybdenum sulfide has attracted people's attention. Due to its unique chemical and physical properties, it is not only used as a lubricant, but also used in various devices, energy storage devices, electronic sensors, biological Medical tools, lithium-ion batteries and electrochemical catalysts for hydrogen p...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/583H01M10/0525
CPCH01M4/364H01M4/5815H01M4/583H01M10/0525Y02E60/10
Inventor 陶华超张亚琼杜少林杨学林
Owner CHINA THREE GORGES UNIV
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