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A kind of tin selenide/tin oxide composite material and its preparation method and application

A technology of composite materials and tin oxide, applied in nanotechnology, electrochemical generators, nanotechnology, etc. for materials and surface science, can solve the problems of reducing material energy density, complex preparation process, harsh reaction conditions, etc., to achieve Excellent rate performance, simple and reliable method, low cost effect

Active Publication Date: 2018-10-12
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since carbon has a lower density and occupies a larger volume, the addition of carbon will reduce the energy density of the material
And because other substances need to be added for reaction, the preparation process is more complicated and the reaction conditions are more harsh

Method used

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  • A kind of tin selenide/tin oxide composite material and its preparation method and application
  • A kind of tin selenide/tin oxide composite material and its preparation method and application
  • A kind of tin selenide/tin oxide composite material and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] First, dissolve 0.5 mol of sodium hydroxide in 100 mL of aqueous solution, then add 0.003 mol of selenium powder, stir at 80°C to fully dissolve it, and obtain a selenium-containing alkaline solution. Dissolve 0.4 mol of citric acid in 100 mL of aqueous solution, then add 0.003 mol of tin dichloride dihydrate, stir well to dissolve it, and obtain a tin-containing acidic solution. Then the above two solutions were mixed, heated and stirred at 90°C for 8h, then the reaction precipitate was washed with water and absolute ethanol, filtered with suction, dried, and finally placed in a muffle furnace, heated at 10°C / min in an air atmosphere to 350°C, keep warm for 5 minutes, and cool naturally to obtain the tin selenide / tin oxide composite material. XRD results show that the substance is a mixed phase of tin selenide and tin dioxide. from figure 2 It can be seen that the complex is irregular nanoparticles with a particle diameter of 10-70nm.

[0044] The sodium-ion half-b...

Embodiment 2

[0046] First, dissolve 0.5 mol of sodium hydroxide in 100 mL of aqueous solution, then add 0.004 mol of selenium powder, and stir at 80°C to fully dissolve it to obtain a selenium-containing alkaline solution. Dissolve 0.4 mol of citric acid in 100 mL of aqueous solution, then add 0.004 mol of tin dichloride dihydrate, stir well to dissolve it, and obtain a tin-containing acidic solution. Then the above two solutions were mixed, heated and stirred at 90°C for 10h, then the reaction precipitate was washed with water and absolute ethanol, filtered with suction, dried, and finally placed in a muffle furnace, heated at 10°C / min in an air atmosphere to 350°C, keep warm for 5 minutes, and cool naturally to obtain the tin selenide / tin oxide composite material.

[0047] The sodium-ion half-battery prepared in this example can still maintain a specific discharge capacity of 405 mAh / g after 100 cycles at a constant current discharge density of 200 mA / g. The lithium-ion half-battery pre...

Embodiment 3

[0049] First, dissolve 0.4 mol of sodium hydroxide in 100 mL of aqueous solution, then add 0.004 mol of selenium powder, stir at 80°C to fully dissolve it, and obtain an alkaline solution containing selenium. Dissolve 0.35 mol of citric acid in 100 mL of aqueous solution, then add 0.004 mol of tin dichloride dihydrate, stir well to dissolve it, and obtain a tin-containing acidic solution. Then the above two solutions were mixed, heated and stirred at 80°C for 10h, then the reaction precipitate was washed with water and absolute ethanol, filtered with suction, dried, and finally placed in a muffle furnace, heated at 10°C / min in an air atmosphere to 330°C, keep warm for 5 minutes, and cool naturally to obtain the tin selenide / tin oxide composite material.

[0050] The sodium-ion half-battery prepared in this example can still maintain a specific discharge capacity of 400 mAh / g after 100 cycles at a constant current discharge density of 200 mA / g. The lithium-ion half-battery pre...

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Abstract

The invention discloses a tin selenide and tin oxide composite material and a preparation method and application thereof. The method comprises the following steps that a selenium-containing alkaline solution and a tin-containing acid solution are mixed according to the selenium-tin molar ratio of 1:1, heating is conducted to reach the temperature of 70-100 DEG C, stirring is conducted, reacting is conducted, precipitates obtained through reacting are washed, filtered, dried and calcined at 300-400 DEG C, and the tin selenide and tin oxide composite material is obtained. The tin selenide and tin oxide composite material serving as a sodium (lithium) ion battery cathode material has an excellent electrochemical property, the preparation method of the material is simple, the cost is low, and the material has a wide industrial application prospect.

Description

technical field [0001] The invention relates to the field of preparation of negative electrode materials for sodium (lithium) ion batteries, in particular to a tin selenide / tin oxide composite material and a preparation method and application thereof. Background technique [0002] As a socially dominant electrochemical energy storage device, lithium-ion batteries have achieved good results in portable electronics (laptops, smart mobile devices, tablets, etc.), electric vehicles, and plug-in hybrid electric vehicles. application. At the same time, sodium-ion batteries have also received widespread attention due to their rich reserves of sodium resources and environmental friendliness. The research and development of sodium-ion batteries can alleviate the limited development of batteries caused by the shortage of lithium resources to a certain extent, and are considered to be the next generation of electric vehicles. It is an ideal choice for automobile power supply and large...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/054H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/366H01M4/58H01M4/628H01M10/0525H01M10/054H01M2004/021Y02E60/10
Inventor 张治安李军明宋俊肖赖延清李劼
Owner CENT SOUTH UNIV
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