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A kind of flower structure SB2S3 material and preparation method thereof for sodium ion battery negative electrode

A sodium-ion battery, flower-like structure technology, applied in battery electrodes, structural parts, circuits, etc., can solve the problems of small contribution to the improvement of battery electrochemical performance, large environmental pollution of sulfur sources, and restrictions on mass production, etc. Excellent electrochemical performance, improving the effect of low capacity, reducing environmental pollution and human injury

Active Publication Date: 2018-11-30
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] It can be seen that Sb 2 S 3 It can greatly improve the electrochemical performance of electrode materials, but on the other hand, the method used in the current report is complicated, which greatly limits its mass production; the sulfur source used is polluted to the environment; the prepared structure is very important for batteries. The contribution to the improvement of electrochemical performance is small, so the development of a Sb with simple preparation process, environmental protection and high capacity 2 S 3 Anode materials are of great scientific significance

Method used

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  • A kind of flower structure SB2S3 material and preparation method thereof for sodium ion battery negative electrode
  • A kind of flower structure SB2S3 material and preparation method thereof for sodium ion battery negative electrode
  • A kind of flower structure SB2S3 material and preparation method thereof for sodium ion battery negative electrode

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 1) 0.2g SbCl 3 Add 10mL dodecanethiol, stir until Sb 2 S 3 Solution A was obtained after complete dissolution.

[0029] 2) Add 0.26g of thioacetamide into 10mL of ethanol, and ultrasonicate for 10min until completely dissolved to obtain solution B.

[0030] Solution A was added dropwise to solution B to obtain mixed solution C. The mixed solution was initially colorless, and turned yellow as the reaction progressed, and precipitates occurred.

[0031] 3) Transfer the mixed liquid C to a polytetrafluoroethylene hydrothermal kettle, place it in a homogeneous reactor, and then react at 140°C for 15 hours. After the reaction is completed, it is naturally cooled to room temperature, and then precipitated by centrifugation. The obtained precipitate was vacuum freeze-dried (-50°C, 20Mpa, ~24h) to obtain the flower-like structure Sb for the negative electrode of the sodium-ion battery 2 S 3 Powder.

Embodiment 2

[0033] 1) 2.57g SbCl 3 Add 25mL dodecanethiol, stir until Sb 2 S 3 Solution A was obtained after complete dissolution.

[0034]2) Add 2.11g of thioacetamide into 25mL of ethanol, and sonicate for 20min until completely dissolved to obtain solution B. Solution A was added dropwise to solution B to obtain mixed solution C. The mixed solution was initially colorless, and turned yellow as the reaction progressed, and precipitates occurred.

[0035] 3) After transferring the mixed liquid C to a polytetrafluoroethylene hydrothermal kettle, place the polytetrafluoroethylene hydrothermal kettle in a homogeneous reactor, then react at 160°C for 20h, and cool to room temperature naturally after the reaction, Then the precipitate is separated by centrifugation, and the separated precipitate is vacuum freeze-dried (-50°C, 20Mpa, ~24h) to obtain the flower-like structure Sb for the negative electrode of the sodium ion battery. 2 S 3 Powder.

Embodiment 3

[0037] 1) 5.34g SbCl 3 Add 40mL dodecanethiol, stir until Sb 2 S 3 Solution A was obtained after complete dissolution.

[0038] 2) Add 4.47g of thioacetamide into 40mL of ethanol, and ultrasonicate for 30min until completely dissolved to obtain solution B. Solution A was added dropwise to solution B to obtain mixed solution C. The mixed solution was initially colorless, and turned yellow as the reaction progressed, and precipitates occurred.

[0039] 3) After transferring the mixed liquid C to a polytetrafluoroethylene hydrothermal kettle, place the polytetrafluoroethylene hydrothermal kettle in a homogeneous reactor, then react at 180°C for 24h, and cool to room temperature naturally after the reaction, Then the precipitate is separated by centrifugation, and the separated precipitate is vacuum freeze-dried (-50°C, 20Mpa, ~24h) to obtain the flower-like structure Sb for the negative electrode of the sodium ion battery. 2 S 3 Powder.

[0040] 4) Analyze the sample (Sb ...

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Abstract

The invention provides a flower-like structure Sb2S3 material for a sodium ion battery anode and a preparation method of the flower-like structure Sb2S3 material. The Sb2S3 material prepared from an antimony source and a sulfur source through a hydrothermal method has a flower-like structure assembled by 200-400 nm nano-rods. When the Sb2S3 material serves as a sodium ion battery anode material, the first-time discharge capacity of the material can reach 900 mAh g<-1>, under the current density of 50 mAh g<-1>, the capacity can be kept at 290 mAh g<-1> after 50 times of circulation, and excellent electrochemical performance is shown. The preparation process is simple, the reaction temperature is low, energy consumption is low, the production cost is reduced, and the material is suitable for large-scale production and preparation.

Description

technical field [0001] The invention belongs to the technical field of materials, and mainly relates to a flower-like structure Sb for negative electrodes of sodium ion batteries. 2 S 3 The method of preparation of the material. Background technique [0002] Sodium-ion batteries are an alternative to lithium-ion batteries for large-scale applications. However, finding suitable anode materials is a great challenge. In the study of anode materials, antimony-based materials have attracted widespread attention in the battery material community due to their high theoretical energy. [0003] However, during the process of Na ion intercalation, Sb will have a large volume effect, resulting in the powdering and falling off of the material during charge and discharge, which reduces the efficiency and cycle stability of the battery, and greatly affects the practical application of this type of material. . In current reports, Sb@C or Sb is mostly used 2 o 3 As a negative electro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/58
CPCH01M4/5815Y02E60/10
Inventor 曹丽云郭玲程娅伊黄剑锋李嘉胤许占位齐慧席乔
Owner SHAANXI UNIV OF SCI & TECH
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