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Method for preparing molybdenum disulfide/stannic sulfide composite material of hollow structure

A molybdenum disulfide, composite material technology, applied in structural parts, secondary batteries, electrochemical generators, etc., can solve the problems of reduced active sites and specific surface area, unfavorable electrode reaction reversibility, and increased electron transport paths. , to improve the rate and cycle performance, reduce stacking phenomenon, improve the rate and specific capacity

Inactive Publication Date: 2018-11-13
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For its application in energy storage, molybdenum disulfide will expand in volume due to the intercalation and extraction of lithium ions and other similar metal ions during the charge and discharge reaction process, and then pulverize, and the original nanostructure collapses, causing Stacking, resulting in the reduction of its active sites and specific surface area, making it unable to fully contact with the electrolyte, increasing the electron transport path, which is not conducive to the reversibility of the electrode reaction

Method used

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  • Method for preparing molybdenum disulfide/stannic sulfide composite material of hollow structure
  • Method for preparing molybdenum disulfide/stannic sulfide composite material of hollow structure
  • Method for preparing molybdenum disulfide/stannic sulfide composite material of hollow structure

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Experimental program
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Effect test

Embodiment 1

[0028] Add 0.06g sodium molybdate, 0.07g sodium stannate, 0.2g thioacetamide and 0.07g silica template into a 100mL beaker, add water and ethanol 40mL (20:20 / v:v), and disperse evenly. The mixed solution was ultrasonicated for 10 min and stirred for 30 min. The stirred mixture was transferred into a polytetrafluoroethylene reactor, heated to 250°C, and reacted for 18 hours. The obtained product was washed with deionized water at a rotation speed of 6000 rpm / min for 5 minutes, and then dried at a temperature of 50° C. for 1 d. The obtained sample was annealed in a tube furnace at 650°C for 5 hours, and the heating rate was 5°C / min; the obtained powder was etched with hydrofluoric acid to prepare a hollow molybdenum disulfide / tin sulfide composite Material. The samples prepared as figure 1 As shown in A, under the scanning electron microscope, the ultrathin curly flexible nanosheets can be observed to assemble uniformly into spheres. Transmission electron microscope pictures...

Embodiment 2

[0030] Add 0.15g sodium molybdate, 0.02g sodium stannate, 0.2g thioacetamide and 0.06g silica template into a 100mL beaker, add water and ethanol 40mL (20:20 / v:v), and disperse evenly. The mixed solution was ultrasonicated for 10 min and stirred for 30 min. The stirred mixture was transferred into a polytetrafluoroethylene reactor, heated to 250°C, and reacted for 18 hours. The obtained product was washed with deionized water at a rotation speed of 6000 rpm / min for 5 minutes, and then dried at a temperature of 50° C. for 1 d. The obtained sample was annealed in a tube furnace at 650°C for 5 hours, and the heating rate was 5°C / min; the obtained powder was etched with hydrofluoric acid to prepare a hollow molybdenum disulfide / tin sulfide composite Material. The samples prepared as figure 1 Shown in B.

Embodiment 3

[0032] Add 0.05g sodium molybdate, 0.05g sodium stannate, 0.2g thioacetamide and 0.2g silica template into a 100mL beaker, add water and ethanol 40mL (20:20 / v:v), and disperse evenly. The mixed solution was ultrasonicated for 10 min and stirred for 30 min. The stirred mixture was transferred into a polytetrafluoroethylene reactor, heated to 250°C, and reacted for 18 hours. The obtained product was washed with deionized water at a rotation speed of 6000 rpm / min for 5 minutes, and then dried at a temperature of 50° C. for 1 d. The obtained sample was annealed in a tube furnace at 650°C for 5 hours, and the heating rate was 5°C / min; the obtained powder was etched with hydrofluoric acid to prepare a hollow molybdenum disulfide / tin sulfide composite Material. The samples prepared as figure 1 C shown.

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Abstract

The invention relates to a method for preparing a molybdenum disulfide / stannic sulfide composite material of a hollow structure. The method comprises the following steps: dispersing sodium molybdate,sodium stannate, thioacetamide and a silicon dioxide template into water and ethanol, carrying out uniform ultrasonic mixing, carrying out a hydrothermal reaction in a polytetrafluoroethylene reactionkettle so as to obtain a molybdenum disulfide-stannic sulfide composite material with a template, and finally etching with hydrofluoric acid so as to remove the template, thereby obtaining the molybdenum disulfide / stannic sulfide composite material of the hollow structure. The molybdenum disulfide / stannic sulfide composite material of the hollow structure, which is prepared by using the method, has good reaction activity, has a synergistic effect in an electrode reaction, can be used as an electrode material and applied to lithium ion batteries and sodium ion batteries, is capable of greatlyimproving rate capability and circulation stability of the batteries, has the potential of being an excellent energy storage material and can be widely applied to lithium ion batteries and sodium ionbatteries.

Description

technical field [0001] The invention relates to a method for preparing an energy storage device material, in particular to a method for preparing a molybdenum disulfide / tin sulfide composite material with a hollow structure. Background technique [0002] With the development of the times, the world's population continues to grow, and human demand for energy is increasing day by day. However, energy depletion and environmental problems are increasingly threatening human security and social progress. Exploring environmentally friendly, sustainable and efficient new energy sources is one of the most reliable ways to fundamentally solve these problems. However, the further use and promotion of new energy must effectively combine the power generation system and energy storage system, so further development of energy storage technology has become very urgent and important. Chemical power sources can realize mutual conversion between electrical energy and chemical energy, and can ...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M10/0525H01M10/054
CPCH01M4/366H01M4/5815H01M10/0525H01M10/054Y02E60/10
Inventor 杨金虎茹佳佳贺婷郝天姿陈炳杰
Owner TONGJI UNIV
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