Molybdenum disulfide and double-carbon-layer co-modified stannous sulfide nanospheres and preparation method thereof

A technology of molybdenum disulfide and stannous sulfide, which is applied in the direction of secondary batteries, electrochemical generators, electrical components, etc., can solve the problems of limiting sodium ion storage capacity, enhancing electronic conductivity, and limiting electron transmission, etc. The effect of large-scale production, good repeatability, and high cycle performance

Inactive Publication Date: 2019-06-11
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method can only enhance the electronic conductivity of the material, and has certain limitations in promoting the transport of sodium ions.
It has also been reported that the use of chemically active substance modification can effectively improve the electrochemical performance of the material, because the active substance coated on the surface of SnS can generate a phase interface and accelerate the transport of ions, thereby improving the performance of high-current charge and discharge, but this method does not Able to provide sufficient active sites for electrons, limiting electron transport
Therefore, these two modification methods limit the sodium ion storage capacity of SnS anode materials under high current to a certain extent.

Method used

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  • Molybdenum disulfide and double-carbon-layer co-modified stannous sulfide nanospheres and preparation method thereof
  • Molybdenum disulfide and double-carbon-layer co-modified stannous sulfide nanospheres and preparation method thereof
  • Molybdenum disulfide and double-carbon-layer co-modified stannous sulfide nanospheres and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Weigh 4.0g of glucose and 1.2g of sodium stannate in a beaker of 30mL of deionized water, stir on a magnetic stirrer for 30min, completely dissolve the raw materials and mix them uniformly, then transfer them to a reaction kettle lined with polytetrafluoroethylene , and then put it in an oven at 170°C for 4 hours; wait for the reaction kettle to cool down to room temperature naturally, pour off the supernatant, then centrifuge, wash with water and ethanol three times in turn, and put it in an oven at 80°C to dry After 12 hours, brown tin dioxide nanosphere powder was obtained; the tin dioxide nanosphere powder of 0.2 g was weighed and put into 50 mL of deionized water, ultrasonicated for 30 minutes, and 300 μL of pyrrole and 1.0 g of phosphomolybdic acid were added to the solution. Stir continuously at room temperature for 24 hours; then centrifuge at 8,000 rpm for 10 minutes, then disperse with water and ethanol, centrifuge, and wash 3 times to obtain a black solid, whi...

Embodiment 2

[0046] Weigh 4.5g of glucose and 1.5g of sodium stannate in a beaker of 30mL of deionized water, stir on a magnetic stirrer for 30min, completely dissolve the raw materials and mix them evenly, then transfer them to a reaction kettle lined with polytetrafluoroethylene , and then put it in an oven at 180°C for 6 hours; wait for the reaction kettle to cool down to room temperature naturally, pour off the supernatant, then centrifuge, wash with water and ethanol three times in turn, and put it in an oven at 70°C to dry After 11 hours, brown tin dioxide nanosphere powder was obtained; the tin dioxide nanosphere powder of 0.2 g was weighed and put into 50 mL of deionized water, ultrasonicated for 30 minutes, and 400 μL of pyrrole and 1.2 g of phosphomolybdic acid were added to the solution. Continue to stir at room temperature for 23 hours; then centrifuge at 8000 rpm for 10 minutes, then disperse with water and ethanol, centrifuge, and wash 3 times to obtain a black solid, which is...

Embodiment 3

[0050] Weigh 3.0 g of glucose and 1.8 g of sodium stannate in a beaker of 30 mL of deionized water, stir on a magnetic stirrer for 30 min, completely dissolve the raw materials and mix them uniformly, then transfer them to a reaction kettle with a polytetrafluoroethylene liner , and then put it in an oven at 160°C for 7 hours; wait for the reaction kettle to cool down to room temperature naturally, pour off the supernatant, then centrifuge, wash with water and ethanol three times in turn, and put it in an oven at 90°C to dry After 13 hours, brown tin dioxide nanosphere powder was obtained; the tin dioxide nanosphere powder of 0.2 g was weighed and put into 50 mL of deionized water, ultrasonicated for 30 minutes, and 200 μL of pyrrole and 0.8 g of phosphomolybdic acid were added to the solution. Stir continuously at room temperature for 25 hours; then centrifuge at 8,000 rpm for 10 minutes, then disperse with water and ethanol, centrifuge, and wash 3 times to obtain a black soli...

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Abstract

The invention discloses molybdenum disulfide and double-carbon-layer co-modified stannous sulfide nanosphere and a preparation method thereof; the preparation method comprises the following steps of by taking sodium stannate and glucose as raw materials, preparing stannic oxide nanospheres by using a hydrothermal method, then dispersing the nanospheres into an aqueous solution containing phosphomolybdic acid and pyrrole, and carrying out stirring and complete mixing, so that phosphomolybdic acid and pyrrole are polymerized on the surface of the stannic oxide nanospheres to obtain a precursor template; and placing the precursor template in a tubular furnace, and carrying out high-temperature reaction with sulfur powder under an argon hydrogen atmosphere to obtain the molybdenum disulfide and double-carbon-layer co-modified stannous sulfide nanospheres. When the synthesized molybdenum disulfide and double-carbon-layer co-modified stannous sulfide nanospheres are used as the negative electrode material of a sodium ion battery, high electrochemical performance and high repeatability are shown, a guiding effect on the development of novel sodium-ion battery materials is achieved, and large-scale production and popularization can be realized easily.

Description

technical field [0001] The invention relates to the field of nanomaterial preparation and sodium ion batteries, in particular to stannous sulfide nanospheres co-modified with molybdenum disulfide and double carbon layers and a preparation method thereof. Background technique [0002] In order to achieve large-scale, stable, and sustainable utilization of clean and renewable energy, it is imperative to develop efficient and inexpensive energy storage devices. The sodium-ion battery is widely distributed and abundant in its raw material sodium, which makes it relatively cheap and suitable for large-scale energy storage. In order to promote the practical application of sodium-ion batteries, ensure that the sodium-ion batteries have the characteristics of high specific capacity, long cycle life and good safety. Higher requirements are put forward for electrode materials, and it is necessary to overcome the problems of low conductivity and volume expansion of electrode materials...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/587H01M10/054
CPCY02E60/10
Inventor 康文裴王玉玉曹东炜孙道峰
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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