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Preparation method of yolk-shell structure molybdenum disulfide@ carbon electrode material

A molybdenum disulfide and carbon electrode technology, applied in battery electrodes, secondary batteries, structural parts, etc., can solve the problems of difficult to control the size of voids, loss of electrode volume energy density/power density, and particle density reduction, etc. Uniform size, outstanding rate performance, and small particle size

Inactive Publication Date: 2018-05-15
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the past studies, the hollow structure materials are difficult to control due to their void size, resulting in the ineffective void space to reduce the particle density, which eventually leads to the loss of the volumetric energy density / power density of the electrode.

Method used

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  • Preparation method of yolk-shell structure molybdenum disulfide@ carbon electrode material
  • Preparation method of yolk-shell structure molybdenum disulfide@ carbon electrode material
  • Preparation method of yolk-shell structure molybdenum disulfide@ carbon electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] 1) Add 12 mmol of elemental sulfur and 5 mmol of molybdenum trioxide to 300 ml of ethylene glycol solution, and sonicate in a water bath for 10 minutes to form a homogeneous solution. Then transfer the above solution to a 500 ml polytetrafluoroethylene autoclave and put it in an oven at a temperature of 200°C for 12 hours to obtain molybdenum disulfide nanospheres.

[0021] 2) Disperse 800 mg of the above-mentioned molybdenum disulfide nanospheres in 200 ml of Tris buffer (10 mM, pH = 8.5), add 200 mg of dopamine and stir slowly for 12 h to obtain molybdenum disulfide@polydopamine. Put molybdenum disulfide@polydopamine into a tube furnace at a heating rate of 5 ℃ / min and a protective gas of N 2 、Carbonized at 800℃ for 2 h to obtain core-shell structure molybdenum disulfide@carbon (named MoS 2 @C-0%,).

[0022] 3) Prepare a hydrogen peroxide solution with a concentration of 0.2 vol %, and then add 200 mg of the core-shell structure molybdenum disulfide@carbon, and stir vigoro...

Embodiment 2

[0025] 1) Add 12 mmol of elemental sulfur and 5 mmol of molybdenum trioxide to 300 ml of ethylene glycol solution, and sonicate in a water bath for 10 minutes to form a homogeneous solution. Then transfer the above solution to a 500 ml polytetrafluoroethylene autoclave and put it in an oven at a temperature of 200°C for 12 hours to obtain molybdenum disulfide nanospheres.

[0026] 2) Disperse 800 mg of the above-mentioned molybdenum disulfide nanospheres in 200 ml of Tris buffer (10 mM, pH = 8.5), add 200 mg of dopamine and stir slowly for 12 h to obtain molybdenum disulfide@polydopamine. Put molybdenum disulfide@polydopamine into a tube furnace at a heating rate of 5 ℃ / min and a protective gas of N 2 、Carbonized at 800℃ for 2 h to obtain core-shell structure molybdenum disulfide@carbon (named MoS 2 @C-0%,).

[0027] 3) Prepare a hydrogen peroxide solution with a concentration of 0.4 vol %, and then add 200 mg of the above core-shell structure molybdenum disulfide@carbon and stir v...

Embodiment 3

[0030] 1) Add 12 mmol of elemental sulfur and 5 mmol of molybdenum trioxide to 300 ml of ethylene glycol solution, and sonicate in a water bath for 10 minutes to form a homogeneous solution. Then transfer the above solution to a 500 ml polytetrafluoroethylene autoclave and put it in an oven at a temperature of 200 ℃ for 12 h to obtain molybdenum disulfide nanospheres.

[0031] 2) Disperse 800 mg of the above-mentioned molybdenum disulfide nanospheres in 200 ml of Tris buffer (10 mM, pH = 8.5), add 200 mg of dopamine and stir slowly for 12 h to obtain molybdenum disulfide@polydopamine. Put molybdenum disulfide@polydopamine into a tube furnace at a heating rate of 5 ℃ / min and a protective gas of N 2 、Carbonized at 800℃ for 2 h to obtain core-shell structure molybdenum disulfide@carbon (named MoS 2 @C-0%,).

[0032] 3) Prepare a hydrogen peroxide solution with a concentration of 0.6 vol %, then add 200 mg of the above core-shell structure molybdenum disulfide@carbon, and stir vigorous...

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Abstract

The invention relates to a preparation method of a yolk-shell structure molybdenum disulfide@ carbon electrode material. The preparation method includes: utilizing molybdenum disulfide precursor solvothermal ethylene glycol to obtain monodisperse molybdenum disulfide nanospheres; allowing dopamine to self-polymerize on the interfaces of molybdenum disulfide particles to obtain a molybdenum disulfide@ polydopamine core-shell structure, and performing high-temperature carbonization on molybdenum disulfide@ polydopamine to obtain core-shell structure molybdenum disulfide@ carbon nanoparticles; dispersing molybdenum disulfide@ carbon in a hydrogen peroxide solution for hydrogen peroxide etching to obtain the yolk-shell structure molybdenum disulfide@ carbon material. A gap between molybdenum disulfide and a carbon shell can be well regulated by adjusting concentration of hydrogen peroxide. When the concentration of hydrogen peroxide is 0.4vol%, discharging specific capacity of a prepared yolk-shell structure molybdenum disulfide@ carbon lithium ion battery cathode in the second circle is up to 1167mAh g-1, discharging specific capacity after being circulated for 200 circles is 880mAh g-1, capacity retaining rate is 75.4%, and rate performance is outstanding.

Description

Technical field [0001] The invention relates to a simple method for preparing a yolk-shell structured molybdenum disulfide@carbon lithium ion battery negative electrode material with a controllable gap, in particular to a method for etching a core-shell structure molybdenum disulfide@carbon by adding an etchant hydrogen peroxide The preparation method belongs to the field of nanocomposite materials. Background technique [0002] In recent decades, conventional energy reserves have been declining, triggering a series of global crises and social problems. To this end, renewable energy sources including solar, wind, hydro, and hydrogen have been developed and utilized. The use of these energy sources requires efficient equipment to store and convert them in the form of electrical energy. In the field of energy conversion, the research of energy storage devices including batteries and supercapacitors, especially electrode materials, is the top priority. With the MoS 2 The discover...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525B82Y40/00
CPCB82Y40/00H01M4/366H01M4/5815H01M4/625H01M4/628H01M10/0525Y02E60/10
Inventor 卢红斌潘运梅张佳佳
Owner FUDAN UNIV
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