Carbon-coated SnSe/r-GO@ C compound with sandwich-like structure and preparation method and application thereof

A sandwich, carbon coating technology, applied in structural parts, active material electrodes, nanotechnology for materials and surface science, etc., to achieve the effect of improving electrochemical performance, high repeatability, and improving structural stability

Active Publication Date: 2021-07-09
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the performance of tin selenide-based anode materials for sodium-ion batteries has great potential, but its charge-discharge structural stability still needs to be further improved

Method used

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  • Carbon-coated SnSe/r-GO@ C compound with sandwich-like structure and preparation method and application thereof
  • Carbon-coated SnSe/r-GO@ C compound with sandwich-like structure and preparation method and application thereof
  • Carbon-coated SnSe/r-GO@ C compound with sandwich-like structure and preparation method and application thereof

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preparation example Construction

[0026] The invention provides a preparation method and application of a carbon-coated sandwich structure SnSe / r-GO@C composite, comprising the following steps:

[0027] Step 1): Add 30-90 mg of graphene oxide GO into 30-70 mL of ethylene glycol or glycerin solvent, and add 0.05696 g-5.696 g of SnCl after ultrasonic dispersion 2 2H 2 O, after stirring evenly, add 0.02g~0.2g of oleic acid until completely dissolved to form solution A; add 0.01975g~1.975g of selenium powder to 3~10ml of ethylenediamine, triethanolamine, hydrazine hydrate or hydroboration In sodium aqueous solution, stir until completely dissolved to obtain solution B; then add solution B dropwise to solution A to form mixed solution C, and stir evenly; wherein, the molar ratio of tin ions to selenium ions is 1: (1~4) ; The concentration of graphene oxide in solution A is 1-2 mg·mL -1 ;

[0028] Step 2): Transfer the mixed solution C to a hydrothermal kettle, then place the hydrothermal kettle in a hydrothermal...

Embodiment 1

[0033] Preparation methods include:

[0034] 1) Add 30 mg of graphene oxide GO to 30 mL of ethylene glycol, ultrasonically disperse and add 0.07595 g of SnCl 2 2H 2 O, after stirring evenly, add 0.02g of oleic acid until completely dissolved to form solution A; add 0.0263g of selenium powder to 3ml of ethylenediamine aqueous solution, stir until completely dissolved to obtain solution B; then add solution B dropwise Add solution A to form mixed solution C, and stir evenly;

[0035] 2) Transfer the mixed solution C to a hydrothermal kettle, then place the hydrothermal kettle in a hydrothermal reactor, and fully react at 120 ° C. After the reaction is completed, cool to room temperature with the furnace to obtain a black mixed solution D; 10 g of graphite oxide Add alkene into 10ml of ethylene glycol, ultrasonically disperse evenly to obtain solution E, add solution E to solution D, and stir to obtain mixed solution F; transfer mixed solution F to a hydrothermal kettle, and th...

Embodiment 2

[0038] Preparation methods include:

[0039] 1) Add 45mg of graphene oxide GO to 50mL of glycerol, ultrasonically disperse and add 0.52785g of SnCl 2 2H 2 O, after stirring evenly, add 0.08g of oleic acid until completely dissolved to form solution A; add 0.0789g of selenium powder to 5ml of triethanolamine aqueous solution, stir until completely dissolved to obtain solution B; then add solution B dropwise to the solution A mixed solution C is formed in A and stirred evenly;

[0040] 2) Transfer the mixed solution C to a hydrothermal kettle, then place the hydrothermal kettle in a hydrothermal reactor, and fully react at 140 ° C. After the reaction is completed, cool to room temperature with the furnace to obtain a black mixed solution D; 10 g of graphite oxide Add alkene into 10ml of glycerin, ultrasonically disperse evenly to obtain solution E, add solution E to solution D, stir evenly to obtain mixed solution F, transfer mixed solution F to a hydrothermal kettle, and then...

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Abstract

The invention discloses a carbon-coated SnSe / r-GO@ C compound with a sandwich-like structure and a preparation method and application thereof. The carbon-coated SnSe / r-GOcompound with the sandwich-like structure is prepared with from ethylene glycol or glycerin serving as a solvent, inorganic tin salt servingas a tin source, a reducing agent and a surface active agent through a simple solvothermal method, wherein the reducing agent not only can reduce selenium powder and provide Se < 2->, but also can reduceoxygen-containing functional groups on the graphene oxide, so that the conductivity of the graphene in the composite material is further improved; and the added reducing agent can be effectively complexed with Sn < 2 + >, the size of the product is controlled, and the nanocrystallization material is more effective for improving the electrochemical performance. The preparation method is simple and high in repeatability, the conductivity of the SnSe-based composite material is improved after the graphene oxide is added and a hydrothermal reaction is carried out, the structural stability of the composite material is further improved by coating a layer of pyrolytic carbon, and the composite material has good electrochemical performance as a sodium ion electrode material.

Description

technical field [0001] The invention relates to the technical field of anode materials for sodium ion batteries, in particular to a carbon-coated sandwich structure SnSe / r-GO@C composite and its preparation method and application. Background technique [0002] Na-ion batteries have an electrochemical energy storage principle similar to lithium-ion batteries, and are rich in sodium resources and low in price. They are considered to be secondary batteries with great potential for large-scale energy storage. However Na + The diameter is much larger than that of Li + , commercial Li-ion battery graphite anodes exhibit poor Na + storage performance. Therefore, the development of high-performance Na-storage anode materials is crucial for Na-ion batteries. As a kind of alloy negative electrode material, tin selenide has a sodium intercalation capacity of 780mAh g -1 , has great potential for development. In addition, SnSe is an important IV-VI semiconductor material with an e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/58H01M10/054B82Y30/00B82Y40/00
CPCH01M4/581H01M4/62H01M4/625H01M10/054B82Y30/00B82Y40/00H01M2004/021H01M2004/027Y02E60/10
Inventor 黄剑锋胡炎杰王芳敏李嘉胤曹丽云王佳乐刘旭华
Owner SHAANXI UNIV OF SCI & TECH
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