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Hollow carbon sphere/molybdenum disulfide bipolar composite material and preparation method and application thereof

A technology of molybdenum disulfide and hollow carbon spheres, which is applied in the field of materials, can solve the problems of battery capacity reduction and achieve the effect of simple preparation method and good initial charge and discharge capacity

Inactive Publication Date: 2019-08-16
SOUTHWEST UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, TiO 2 Equipolar metal oxides or metal sulfides are used as the carrier of the active substance sulfur. These materials are usually used in room temperature sodium-sulfur batteries to obtain a higher initial capacity, but the battery capacity will increase rapidly with the number of cycles. reduce

Method used

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  • Hollow carbon sphere/molybdenum disulfide bipolar composite material and preparation method and application thereof
  • Hollow carbon sphere/molybdenum disulfide bipolar composite material and preparation method and application thereof
  • Hollow carbon sphere/molybdenum disulfide bipolar composite material and preparation method and application thereof

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Experimental program
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Effect test

Embodiment 1

[0038] Preparation of hollow carbon spheres / molybdenum disulfide (HCS / MoS 2 ) bipolar material, its preparation method is as follows:

[0039](1) First mix 80mL of deionized water and 80mL of DMF, then add 5mL of cetyltrimethylammonium bromide solution (20mg / mL) and 6.4mL of sodium hydroxide solution (6mg / mL) under ultrasonic conditions ), stir well, then add 1.2mL tetraethyl silicate and dissolve in 12mL methanol solution, stir well and then filter with suction, take the solid phase, wash and dry to obtain SiO 2 Template ball (field emission scanning electron microscope picture as figure 1 shown).

[0040] (2) At first, the silica sphere template sphere (SiO2) prepared in step (1) 2 ) as a template, 60mg SiO 2 The spheres were evenly dispersed in 400mL Tris buffer solution (10mM, pH=8.5) and ultrasonically dispersed, then 180mg of dopamine hydrochloride was added to the solution, and after stirring evenly, the solid phase was taken to obtain a precursor after washing and ...

Embodiment 2

[0044] Preparation of hollow carbon spheres / molybdenum disulfide (HCS / MoS 2 ) bipolar material, its preparation method is as follows:

[0045] (1) First mix 160mL deionized water and 80mL DMF, then add 5mL cetyltrimethylammonium bromide solution (15mg / mL) and 6.4mL sodium hydroxide solution (8mg / mL) under ultrasonic conditions ), stir well and then add 1.2mL tetraethyl silicate to dissolve in 4mL methanol solution, stir well and then filter with suction, take the solid phase and wash and dry to obtain silica template spheres (SiO 2 template ball).

[0046] (2) 60mg SiO 2 The template spheres were evenly dispersed in 400mL Tris buffer solution (5mM, pH=8.5) and ultrasonically dispersed, then 30mg of dopamine hydrochloride was added to the solution, after stirring evenly, the solid phase was taken and washed and dried to obtain a hollow carbon sphere precursor. It is then subjected to a reducing gas (H 2 :Ar=10:90v:v) with a heating rate of 2°C / min, heat treatment at 700°C f...

Embodiment 3

[0049] Preparation of hollow carbon spheres / molybdenum disulfide (HCS / MoS 2 ) bipolar material, its preparation method is as follows:

[0050] (1) First mix 100mL deionized water and 80mL DMF, then add 5mL cetyltrimethylammonium bromide solution (18mg / mL) and 6.4mL sodium hydroxide solution (7mg / mL) under ultrasonic conditions ), stir well, then add 0.4mL tetraethyl silicate and dissolve in 10mL methanol solution, stir well and then filter with suction, take the solid phase and wash and dry to obtain silica template spheres (SiO 2 template ball).

[0051] (2) 60mg SiO 2 The template spheres were uniformly dispersed in 400mL Tris buffer solution (8mM, pH=8.5) and ultrasonically dispersed, then 100mg of dopamine hydrochloride was added to the solution, after stirring evenly, the solid phase was taken, washed and dried to obtain a hollow carbon sphere precursor, It is then subjected to a reducing gas (H 2 :Ar=10:90v:v) with a heating rate of 2°C / min, heat treatment at 700°C f...

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Abstract

The invention relates to a hollow carbon sphere / molybdenum disulfide bipolar composite material and a preparation method and application thereof, and belongs to the technical field of materials. According to the hollow carbon sphere / molybdenum disulfide bipolar composite material, ammonium tetrathiomolybdate and hollow carbon spheres are used as raw materials, MoS2 nano-sheets are prepared througha hydrothermal method to be uniformly coated on the surface of the hollow carbon spheres, and the hollow structure is favorable for storage of the active substance sulfur and alleviating the volumetric expansion of sulfur during the electrochemical cycle process and also providing a place for reaction. Besides, polysulfides produced in the electrochemical process can also be adsorbed to reduce the loss of active substances. The hollow carbon sphere / molybdenum disulfide bipolar material is uniformly coated on the glass fiber to form a composite membrane; and the composite material is obtainedby injecting the active substance sulfur into the hollow structure of the hollow carbon sphere / molybdenum disulfide bipolar material and can be used as the positive electrode material of a room temperature sodium-sulfur battery to be applied to the room temperature sodium-sulfur battery so as to obtain good rate performance and stable cycle performance.

Description

technical field [0001] The invention belongs to the technical field of materials, and in particular relates to a hollow carbon sphere / molybdenum disulfide bipolar composite material and a preparation method and application thereof. Background technique [0002] Rechargeable batteries are the basic power technology for electric vehicles and grid energy storage. The popularization and application of this technology can not only reduce the environmental pollution caused by the use of fossil fuels, but also avoid the intermittency of wind energy, solar energy and other green energy, and contribute to the development of human society. Provide convenience for life and development. Therefore, there is an urgent need to explore and find an energy storage system that can complement the existing lithium-ion batteries (LIBs) with high energy density and long cycle life. In recent years, room temperature sodium-sulfur batteries have been favored due to their high specific capacity (167...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/583H01M4/62H01M4/58H01M10/36H01M2/16
CPCH01M4/366H01M4/5815H01M4/583H01M4/625H01M10/36H01M50/431Y02E60/10
Inventor 徐茂文杨婷婷
Owner SOUTHWEST UNIVERSITY
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