Method for preparing molybdenum disulfide/molybdenum dioxide composite material used for sodium ion negative electrode material

A technology of molybdenum disulfide and molybdenum dioxide, which is applied in nanotechnology for materials and surface science, battery electrodes, electrical components, etc., can solve problems such as difficulty in fully utilizing heterojunctions and uneven distribution, and achieve improved cycle The effect of stability

Inactive Publication Date: 2019-07-23
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in this method, the molybdenum dioxide is first synthesized and then the molybdenum disulfide is synthesized. There is an uneven distribution of the two, and it is difficult to give full play to the role of the heterojunction.

Method used

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  • Method for preparing molybdenum disulfide/molybdenum dioxide composite material used for sodium ion negative electrode material
  • Method for preparing molybdenum disulfide/molybdenum dioxide composite material used for sodium ion negative electrode material
  • Method for preparing molybdenum disulfide/molybdenum dioxide composite material used for sodium ion negative electrode material

Examples

Experimental program
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Effect test

Embodiment 1

[0023] 1). Dissolve sodium molybdate dihydrate in deionized water, stir at 200r / min for 0.5h to prepare an aqueous solution of sodium molybdate with a concentration of 0.02mol / L;

[0024] 2). Add thiourea to the solution configured in step 1), the concentration of the thiourea aqueous solution is 0.02mol / L, continue to stir at 200r / min for 0.5h, add the surfactant cetyltrimethyl bromide Concentration of ammonium chloride, cetyltrimethylammonium bromide is 0.01mol / L, continue to stir at 200r / min for 0.5h;

[0025] 3). After the solution obtained in step 2) is transferred to the inner lining of a polytetrafluoroethylene hydrothermal reactor and sealed with a stainless steel reactor, the hydrothermal conditions: heating to 180° C. and holding for 18 hours. After the reaction is completed, cool to room temperature with the furnace, take out the reactant, centrifuge and wash 6 times with absolute ethanol and deionized water, and dry in vacuum at 60°C for 10 hours to obtain a molybdenum ...

Embodiment 2

[0029] 1). Dissolve sodium molybdate dihydrate in deionized water, stir at 300r / min for 1.0h to prepare an aqueous solution of sodium molybdate with a concentration of 0.060mol / L;

[0030] 2). Add thiourea to the solution configured in step 1), the concentration of thiourea aqueous solution is 0.06mol / L, continue to stir at 300r / min for 1.0h, then add the surfactant cetyltrimethyl bromide Concentration of ammonium chloride, cetyltrimethylammonium bromide is 0.025mol / L, continue stirring at 300r / min for 1.0h;

[0031] 3). After the solution obtained in step 2) is transferred to the inner lining of a polytetrafluoroethylene hydrothermal reactor and sealed with a stainless steel reactor, the hydrothermal conditions: heating to 200° C. and holding for 24 hours. After the reaction is completed, cool to room temperature with the furnace, take out the reactant, centrifuge and wash 7 times with absolute ethanol and deionized water, and vacuum dry at 70°C for 11 hours to obtain a molybdenum...

Embodiment 3

[0035] 1). Dissolve sodium molybdate dihydrate in deionized water and stir for 1.5h at 400r / min to prepare an aqueous solution of sodium molybdate with a concentration of 0.10mol / L;

[0036] 2). Add thiourea to the solution configured in step 1), the concentration of the thiourea aqueous solution is 0.1mol / L, continue to stir at 400r / min for 1.5h, add the surfactant cetyltrimethyl bromide The concentration of ammonium chloride, cetyltrimethylammonium bromide is 0.05mol / L, continue to stir at 400r / min for 1.5h;

[0037] 3). After the solution obtained in step 2) is transferred to the inner lining of a polytetrafluoroethylene hydrothermal reactor and sealed with a stainless steel reactor, the hydrothermal conditions: heating to 220° C. and holding for 36 hours. After the reaction, the reaction was cooled to room temperature with the furnace, the reactants were taken out, washed with absolute ethanol and deionized water for 8 times, and dried under vacuum at 80°C for 12 hours to obtai...

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Abstract

The invention provides a method for preparing a molybdenum disulfide / molybdenum dioxide composite material used for a sodium ion negative electrode material; the method comprises the steps of adding sodium molybdate dihydrate into deionized water, and performing stirring to obtain a sodium molybdate solution; sequentially adding thiourea and CTAB into the sodium molybdate solution, sufficiently stirring, and transferring into a hydrothermal reaction kettle; and separating the precipitate, washing and drying to obtain a nano-sheet assembled molybdenum disulfide / molybdenum dioxide heterogeneousmaterial. The material is made of molybdenum disulfide / molybdenum dioxide heterostructure nano-sheets, wherein the thickness of the nano-sheets ranges from 10nm to 20nm, and the length of the nano-sheets is 0.8-1.0[mu]m. The nano-sheets of the heterostructure have the advantages that the stability of the structure is greatly improved, the nano-sheets of the heterogeneous structure do not have agglomeration, and the nano-sheets are lap jointed into flower shape, so that the specific surface area is greatly enlarged, and the cycling stability of the molybdenum disulfide / molybdenum dioxide sodiumion battery negative electrode material is improved.

Description

Technical field [0001] The invention belongs to the field of inorganic nano material synthesis. It involves a hydrothermal method to prepare heterogeneously bonded molybdenum disulfide and molybdenum dioxide composite materials. Specifically, it relates to a method for preparing a molybdenum disulfide and molybdenum dioxide composite material for sodium ion anode material. Background technique [0002] In today's society, a large number of portable devices have entered people's lives, such as mobile phones, laptops, sports bracelets, watches, etc., which have brought great convenience to people's lives. People all hope that these electronic devices can quickly replenish power and then use them for a long time, so higher requirements are put forward for energy storage devices. At present, lithium-ion batteries are mainly assembled in these portable devices. A large number of lithium-ion batteries are manufactured and used, which has caused a shortage of lithium resources. Accord...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/58B82Y30/00
CPCB82Y30/00H01M4/364H01M4/485H01M4/5815Y02E60/10
Inventor 孙晓红郭金泽郑春明
Owner TIANJIN UNIV
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