Tin diselenide/polyethyleneimine composite material and preparation method and application thereof

A polyethyleneimine, tin diselenide technology, applied in secondary batteries, electrochemical generators, electrical components, etc., can solve the problem of reducing the cycle stability of electrode materials, reducing the cycle life of sodium ion batteries, and limiting diselenide. tin industrial production and other issues, to achieve broad industrial application prospects, excellent rate performance and cycle stability performance, and the effect of improving rate performance and cycle stability performance

Active Publication Date: 2016-10-26
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the granular tin diselenide is very easy to agglomerate during the charging and discharging process of the sodium ion battery, thereby reducing the cycle life of the sodium ion battery; Polymerization is also relatively serious, so it also affects the electrochemical performance of the battery
Moreover, in the existing preparation process, highly toxic substances such as selenium diselenide and hydrazine are generally used as raw materials, which seriously limits the industrial production of tin diselenide
[0005] In addition, due to the large volume expansion of tin diselenide in the process of deintercalating sodium ions, the cycle stability of it as an electrode material is greatly reduced.

Method used

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  • Tin diselenide/polyethyleneimine composite material and preparation method and application thereof
  • Tin diselenide/polyethyleneimine composite material and preparation method and application thereof
  • Tin diselenide/polyethyleneimine composite material and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] First, weigh 5 mmol of tin tetrachloride pentahydrate and dissolve it in 50 mL of deionized water and stir for 10 min to dissolve it completely. Take another 50mL of water, pass nitrogen gas for 5min first, then add 20mmol sodium borohydride, stir well, after it is completely dissolved, add 10mmol selenium powder, stir for 30min to make it completely dissolved. Then the above two solutions were mixed, 0.4g of polyethyleneimine with a molecular weight of 1200 was added, stirred for 1 hour, then moved to a reaction kettle, and subjected to a hydrothermal reaction at 200°C for 24 hours, and then the hydrothermal reaction product was suction filtered, After washing and vacuum drying, a tin diselenide / polyethyleneimine composite material is obtained. XRD results show that the tin diselenide material does not have any impurities.

[0041] From figure 2 and image 3 It can be seen that the thickness of the tin diselenide hexagonal nanosheet is about 10 nm, and the side len...

Embodiment 2

[0044]First, weigh 6 mmol of tin tetrachloride pentahydrate and dissolve it in 50 mL of deionized water and stir for 10 min to completely dissolve it. Take another 50mL of water, pass nitrogen gas for 5min first, then add 25mmol sodium borohydride, stir well, after all dissolved, add 12mmol selenium powder, stir for 30min to make it completely dissolved. Then the above two solutions were mixed, 0.4g of polyethyleneimine with a molecular weight of 1200 was added, stirred for 1 hour, then moved to a reaction kettle, and subjected to a hydrothermal reaction at 200°C for 24 hours, and then the hydrothermal reaction product was suction filtered, After washing and vacuum drying, a tin diselenide / polyethyleneimine composite material is obtained. The thickness of the tin diselenide hexagonal nanosheet is about 15nm, and the side length is about 80nm.

[0045] The negative electrode composite material of the sodium ion battery prepared in this example and the sodium sheet are assemble...

Embodiment 3

[0047] First, weigh 6 mmol of tin tetrachloride pentahydrate and dissolve it in 50 mL of deionized water and stir for 10 min to completely dissolve it. Take another 50mL of water, pass nitrogen gas for 5min first, then add 25mmol sodium borohydride, stir well, after all dissolved, add 12mmol selenium powder, stir for 30min to make it completely dissolved. Then the above two solutions were mixed, 0.4 g of polyethyleneimine with a molecular weight of 2000 was added, stirred for 1 hour, then moved to a reaction kettle, and subjected to a hydrothermal reaction at 200°C for 24 hours, and then the hydrothermal reaction product was suction-filtered, After washing and vacuum drying, a tin diselenide / polyethyleneimine composite material is obtained. The thickness of the tin diselenide hexagonal nanosheet is about 14nm, and the side length is about 80nm.

[0048] The negative electrode composite material of the sodium ion battery prepared in this example and the sodium sheet are assemb...

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Abstract

The invention discloses a tin diselenide/polyethyleneimine composite material and a preparation method and application thereof. The preparation method comprises: dissolving selenium powder in a sodium borohydride solution with inert gas saturated to obtain a selenium-powder-containing solution, mixing the selenium-powder-containing solution with a tin sources aqueous solution according to a required ratio of selenium to tin for preparation of tin diselenide to obtain a mixed solution, adding polyethyleneimine into the mixed solution, performing full stirring, and carrying out a hydrothermal reaction; and filtering, washing and drying the obtained product to obtain the tin diselenide/polyethyleneimine composite material. In the obtained composite material, polyethyleneimine uniformly coats tin diselenide hexagonal nanosheets. The composite material can be taken as an anode material for a sodium-ion battery and has excellent electrochemical performance. The composite material is simple in preparation method and low in cost and has bright industrialized application prospects.

Description

technical field [0001] The invention relates to the field of preparation of negative electrode materials for sodium ion batteries, in particular to a tin diselenide / polyethyleneimine composite material and its preparation method and application. 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-scale...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/60H01M10/054
CPCH01M4/362H01M4/581H01M4/602H01M10/054Y02E60/10
Inventor 张治安李军明陈晓彬赖延清张凯李劼
Owner CENT SOUTH UNIV
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