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Preparation method of molybdenum disulfide material used for sodium lithium battery anodes

A molybdenum disulfide and sodium battery technology, used in molybdenum sulfide, battery electrodes, nanotechnology and other directions, can solve the problems of limited capacity and reduced theoretical specific capacity of composite materials, and achieve the effect of increasing specific surface area and improving cycle stability.

Inactive Publication Date: 2019-07-02
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the proper compounding of carbon materials can improve the stability of the material, the theoretical specific capacity of the composite material will decrease due to the limited capacity contributed by the carbon material itself.

Method used

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  • Preparation method of molybdenum disulfide material used for sodium lithium battery anodes
  • Preparation method of molybdenum disulfide material used for sodium lithium battery anodes
  • Preparation method of molybdenum disulfide material used for sodium lithium battery anodes

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Embodiment 1

[0026] 1). Dissolve sodium molybdate dihydrate in deionized water, stir at 200r / min for 0.5h, and prepare an aqueous sodium molybdate solution with a concentration of 0.02mol / L;

[0027] 2). Add thiourea to the solution configured in step 1), the concentration of the thiourea aqueous solution is 0.3mol / L, continue stirring at a speed of 200r / min for 0.5h, then add the surfactant hexadecyltrimethyl bromide Ammonium chloride, the concentration of cetyltrimethylammonium bromide is 0.01mol / L, continue to stir with 200r / min rotating speed for 0.5h;

[0028] 3). Add dropwise dilute hydrochloric acid with a concentration of 0.1mol / L to the solution obtained in step 2) to adjust pH=7, and continue to stir at a speed of 200r / min for 0.5h;

[0029] 4). Transfer the solution obtained in step 3) to the inner lining of a polytetrafluoroethylene hydrothermal reaction kettle, and seal it with a stainless steel reaction kettle. Hydrothermal conditions: heating to 180° C., and keeping it warm ...

Embodiment 2

[0033] 1). Sodium molybdate dihydrate was dissolved in deionized water, stirred at a speed of 300r / min for 0.8h, and an aqueous solution of sodium molybdate with a concentration of 0.05mol / L was prepared;

[0034]2). Add thiourea to the solution configured in step 1), the concentration of the thiourea aqueous solution is 0.1mol / L, continue stirring at a speed of 300r / min for 0.8h, then add the surfactant hexadecyltrimethyl bromide Ammonium chloride, the concentration of cetyltrimethylammonium bromide is 0.04mol / L, continue to stir with 300r / min rotating speed for 0.8h;

[0035] 3). Add dropwise dilute hydrochloric acid with a concentration of 0.5 mol / L to the solution obtained in step 2) to adjust pH=3, and continue to stir at a speed of 300 r / min for 0.8 h;

[0036] 4). Transfer the solution obtained in step 3) to the lining of a polytetrafluoroethylene hydrothermal reaction kettle, and seal it with a stainless steel reaction kettle. Hydrothermal conditions: heating to 200° C...

Embodiment 3

[0040] 1). Sodium molybdate dihydrate was dissolved in deionized water, and stirred at a speed of 400r / min for 1 hour to prepare an aqueous sodium molybdate solution with a concentration of 0.09mol / L;

[0041] 2). Add thiourea to the solution prepared in step 1), the concentration of thiourea aqueous solution is 0.225mol / L, continue to stir at 400r / min for 1h, then add the surfactant hexadecyl trimethyl bromide Ammonium, the concentration of cetyltrimethylammonium bromide is 0.09mol / L, continue to stir with 400r / min rotating speed for 1h;

[0042] 3). Add 1.0 mol / l dilute hydrochloric acid dropwise to the solution obtained in step 2) to adjust pH=1, and continue to stir at 400 r / min for 1 h;

[0043] 4). Transfer the solution obtained in step 3) to the inner lining of a polytetrafluoroethylene hydrothermal reaction kettle, and seal it with a stainless steel reaction kettle. Hydrothermal conditions: heating to 220° C., and keeping it warm for 12 hours. After the reaction, cool...

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Abstract

The invention provides a preparation method of a molybdenum disulfide material used for sodium lithium battery anodes. The preparation method comprises following steps: dissolving sodium molybdenum dihydrate in deionized water and stirring; adding thiourea to a prepared solution for stirring, adding surfactant cetyltrimethylammonium bromide, stirring to obtain a solution; adding dilute hydrochloric acid in the solution dropwise to adjust the pH value to 1 to 7, and stirring continuously; transferring an obtained mixed solution to the lining of a polytetrafluoroethylene hydrothermal reaction kettle for hydrothermal reaction; cooling an obtained mixture to normal temperature in the reaction kettle, taking an obtained reactant out, washing and vacuum drying so as to obtain a molybdenum disulfide material of a nanometer flower shaped structure; introducing the molybdenum disulfide material into a quartz boat, carbonizing in a tube furnace with Ar gas to obtain a nanometer flower shaped structure molybdenum disulfide material with good crystallinity. The nanosheet thickness is 10 to 20 nm and the length is 100 to 200 nm. The small size molybdenum disulfide nanosheet is capable of improving the cycle stability of molybdenum disulfide as a lithium / sodium battery anode material.

Description

technical field [0001] The invention belongs to the field of synthesis of inorganic nanomaterials, and relates to the preparation of nanosheet-assembled nanoflower-shaped molybdenum disulfide materials by a hydrothermal carbonization method, in particular to the preparation of nanoflower-shaped molybdenum disulfide materials used for lithium-sodium battery negative electrodes method. Background technique [0002] With the development of society, people's demand for energy is increasing, especially new energy. Compared with traditional energy, new energy has the advantages of environmental protection and renewable, so the development, storage and utilization of new energy has become a hot research topic in today's society. Since the end of the last century, lithium-ion batteries have occupied the field of energy storage. Lithium-ion batteries are favored by people because they can be repeatedly charged and discharged, small in size and long in life. People assemble lithium...

Claims

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Application Information

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IPC IPC(8): C01G39/06B82Y40/00H01M4/58H01M10/0525
CPCB82Y40/00C01G39/06C01P2002/72C01P2004/03C01P2004/30C01P2006/40H01M4/5815H01M10/0525Y02E60/10
Inventor 孙晓红郭金泽郑春明
Owner TIANJIN UNIV
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