Ag/SnS2@rGO, preparation method and application

A 1gsncl5·5h2o, flower-shaped technology, applied in the field of preparation, Ag/SnS2@rGO, can solve the problems of poor electrode stability and large volume change, and achieve strong crystallinity, high purity, and improved conductivity.

Inactive Publication Date: 2019-08-16
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The object of the present invention is to provide a kind of Ag / SnS 2 @rGO, preparation method and application, solve the existing SnS 2 Defects of large volume change and poor electrode stability during charge and discharge

Method used

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  • Ag/SnS2@rGO, preparation method and application
  • Ag/SnS2@rGO, preparation method and application
  • Ag/SnS2@rGO, preparation method and application

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preparation example Construction

[0031] The invention provides a kind of graphene self-assembled wrapped Ag ion modified curdled SnS 2 As the preparation method of sodium ion battery negative electrode material, comprise the following steps:

[0032] Step 1, Spherical SnS 2 Preparation of:

[0033] 0.1~1g SnCl 5 ·5H 2 O was mixed with 20ml polyvinyl alcohol to obtain solution A; 0.01-0.5g thioglycolic acid was mixed with 20ml polyvinyl alcohol to obtain solution B; 0.1-0.5g CTAB was mixed with 30ml polyvinyl alcohol to obtain solution C. Wherein, the concentration of solution A is 0.05-0.1ml / L; the concentration of solution B is 0.1-0.5ml / L;

[0034] Solution A and solution C were mixed at a volume ratio of 2:3 and then ultrasonically treated for 30 minutes to obtain product D;

[0035] Then mix the product D and the solution B at a volume ratio of 5:2 to obtain the product E; put the product E into the reaction kettle, and conduct a hydrothermal reaction at 150-220°C for 8-10 hours; After washing three...

Embodiment 1

[0045] (1) 0.1g of SnCl 5 ·5H 2 O, the mercaptoacetic acid of 0.01g and the CTAB of 0.1g melt into 20ml respectively, in the polyvinyl alcohol (PEG200) of 30ml respectively stir 30 minutes, then SnCl 5 ·5H 2 O and CTAB were mixed and sonicated for 30 minutes, then mixed with thioglycolic acid and stirred for 2 hours.

[0046] (2) Put the stirred solution into a 100 mL stainless steel reaction kettle and react at 200° C. for 10 hours. After the reaction, the solution was washed three times with water and alcohol, and then dried at 80°C to obtain flower-shaped SnS 2 .

[0047] (3) Tollens reagent: 50ml of 2% silver nitrate was placed in a 250ml beaker, and 1ml of 2% ammonia water was added and stirred until the brown color just disappeared to prepare Tollens reagent.

[0048] (4) Weigh 0.2g of flower-shaped SnS prepared in step 1 2 Add 10ml of Tollens reagent and stir gently for 30 minutes, add 3ml of formaldehyde dropwise and stir for 10 hours, finally, wash with water an...

Embodiment 2

[0055] (1) 0.4655g of SnCl 5 ·5H 2 O, the mercaptoacetic acid of 0.2579g and the CTAB of 0.35g melt into 20ml respectively, in the polyvinyl alcohol (PEG200) of 30ml respectively stir 30 minutes, then SnCl 5 ·5H 2 O and CTAB were mixed and sonicated for 30 minutes, then mixed with thioglycolic acid and stirred for 2 hours.

[0056] (2) Put the stirred solution into a 100 mL stainless steel reaction kettle and react at 200° C. for 10 hours. After the reaction, the solution was washed three times with water and alcohol, and then dried at 80°C to obtain flower-shaped SnS 2 .

[0057] (3) Tollens reagent: 50ml of 2% silver nitrate was placed in a 250ml beaker, and 1ml of 2% ammonia water was added and stirred until the brown color just disappeared to prepare Tollens reagent.

[0058] (4) Weigh 0.3g of flower-shaped SnS prepared in step 1 2 Add 20ml of Tollens reagent and stir gently for 30 minutes, drop a little formaldehyde and stir for 10 hours. Finally, wash with water an...

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Abstract

The invention provides a preparation method of Ag / SnS2@rGO, which includes the following steps: weighing and taking 0.25g of Ag-modified globular-flower-like SnS2 prepared by the preparation method ofAg-modified globular-flower-like SnS2 described in Right 3, adding the Ag-modified globular-flower-like SnS2 into 3-10ml of monolayer graphene oxide dispersion liquid with a concentration of 1mg / ml,and stirring the Ag-modified spherical SnS2 uniformly by magnetic force; and then, adding 0.1-0.5g of ascorbic acid to prepare Ag / SnS2@rGO through self-assembly. The sheet structure of graphene oxideis used to restrain the enormous volume expansion caused by SnS2 intercalation and de-intercalation in sodium ions, and thus, the cycle stability of the material is improved. Moreover, the sheet structure of graphene oxide can further limit the de-intercalation of Ag ions from SnS2 sheets.

Description

technical field [0001] The invention relates to the technical field of sodium ion batteries, in particular to an Ag / SnS battery 2 @rGO, preparation method and application. Background technique [0002] With the rapid development of the battery industry, the disadvantages of lithium-ion batteries are becoming more and more obvious. Lithium resource reserves are limited and can no longer meet people's growing energy needs. However, sodium-ion batteries will gradually become the mainstream due to their low cost, abundant reserves and wide distribution. Ideal replacement for lithium-ion batteries. [0003] Battery technology is the threshold for the vigorous promotion and development of electric vehicles, and the current battery industry is at a time when both lead-acid batteries and traditional lithium batteries are facing bottlenecks. bring about new changes. [0004] Graphene is a planar film composed of carbon atoms with sp2 hybrid orbitals to form a hexagonal honeycomb l...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/054
CPCH01M4/362H01M4/5815H01M4/626H01M4/628H01M10/054Y02E60/10
Inventor 杨艳玲孙瑜侯小江冯雷锁国权和茹梅陈华军叶晓慧张荔陈志刚朱建锋毕雅欣邹鑫鑫李丹石洪昌
Owner SHAANXI UNIV OF SCI & TECH
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