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Preparation method for sodium-ion battery antimony/carbon anode composite material with yolk-shell structure

A technology of sodium ion battery and composite material, applied in the field of preparation of negative electrode material of sodium ion battery, can solve the problem of inability to effectively suppress the volume expansion of antimony, achieve good thermal stability and mechanical properties, good mechanical stability, and improve electronic conductivity sexual effect

Inactive Publication Date: 2015-09-09
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These composite materials greatly improved the electrochemical performance of antimony negative electrodes, but they could not effectively suppress the volume expansion of antimony during charge and discharge.

Method used

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  • Preparation method for sodium-ion battery antimony/carbon anode composite material with yolk-shell structure
  • Preparation method for sodium-ion battery antimony/carbon anode composite material with yolk-shell structure
  • Preparation method for sodium-ion battery antimony/carbon anode composite material with yolk-shell structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039]Weigh 2 g of antimony trichloride and add it into deionized water, and stir at room temperature to form a clear solution A. In addition, 1.4 g of sodium borohydride and 6 g of sodium hydroxide were weighed and dissolved in deionized water to obtain solution B. Under the condition of stirring, at a temperature of 60° C., solution B was dropped into solution A drop by drop, and the stirring was continued for 1 h. Then centrifuge and wash to obtain nano-antimony particles; add 1 g of nano-antimony particles prepared into a mixed solution of 50 mL of deionized water, 100 mL of absolute ethanol and 3 mL of 30wt.% ammonia water, ultrasonically treat for 1 h, and measure 0.8 g of ethyl orthosilicate Drop into it and stir at 30°C for 5h. Centrifugal cleaning to obtain the antimony silica core-shell structure; weigh 1g of dopamine hydrochloride and dissolve it in deionized water, add 1.5g of antimony silica, ultrasonically disperse for 1 hour, and adjust the pH of the solution t...

Embodiment 2

[0041] Weigh 2 g of antimony nitrate and add it into deionized water, stir at room temperature to form a clear solution A. In addition, 1.4 g of sodium borohydride and 6 g of sodium hydroxide were weighed and dissolved in deionized water to obtain solution B. Under the condition of stirring, at a temperature of 100° C., solution B was dropped into solution A drop by drop, and the stirring was continued for 1 h. Then centrifuge and wash to obtain nanometer antimony particles; add 1g of nanometer antimony particles to 50mL of deionized water, 90mL of absolute ethanol and 5mL of 25wt.% ammonia solution, sonicate for 1.5h, and measure 0.8g of ethyl orthosilicate Ester was added dropwise and stirred at 30°C for 10h. Centrifugal cleaning to obtain the antimony silica core-shell structure; weigh 1g of dopamine hydrochloride and dissolve it in deionized water, add 1.5g of antimony silica, ultrasonically disperse for 1 hour, and adjust the pH of the solution to 8.5 by adding tris(hydr...

Embodiment 3

[0043] Weigh 2 g of antimony trichloride and add it into deionized water, and stir at room temperature to form a clear solution A. In addition, 1.5 g of sodium borohydride and 7 g of sodium hydroxide were weighed and dissolved in deionized water to obtain solution B. Under the condition of stirring, at a temperature of 60° C., solution B was dropped into solution A drop by drop, and the stirring was continued for 1 h. Then centrifuge and wash to obtain nano-antimony particles; add 1g of nano-antimony particles prepared into 60mL of deionized water, 100mL of absolute ethanol and 3mL of 30wt.% ammonia water mixed solution, sonicate for 1h, measure 1g of ethyl orthosilicate dropwise Into it, stirred at 30°C for 3h. Centrifugal cleaning to obtain the core-shell structure of antimony silica; weigh 1g of dopamine hydrochloride and dissolve it in deionized water, add 1.5g of antimony silica, ultrasonically disperse for 2 hours, and adjust the pH of the solution to 8.5 by adding tris...

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Abstract

The invention discloses a preparation method for a sodium-ion battery antimony / carbon anode composite material with a yolk-shell structure. The preparation method comprises the following steps: preparing nano antimony particles through a reduction method; sequentially coating the surfaces of the nano antimony particles with a silicon dioxide layer and a poly-dopamine layer; carbonizing, and removing the silicon dioxide layer through an etching method to obtain the antimony / carbon anode composite material with the yolk-shell structure. The antimony / carbon anode composite material is good in mechanical stability and thermal stability, and can be used to prepare a sodium-ion battery with high mass ratio capacity and good rate capability. The preparation method is simple in operation, easy to operate, low in cost and suitable for being applied to industry and mass production.

Description

technical field [0001] The invention relates to a preparation method of a negative electrode material of a sodium ion battery, and belongs to the field of sodium ion batteries. Background technique [0002] With the rapid development of portable electronic devices and electric vehicles, secondary batteries for supplying energy have received more and more attention. In recent years, sodium-ion batteries have attracted great interest. Na-ion batteries take advantage of the abundant sodium resources in the earth's crust, which makes Na-ion batteries low-cost and may replace Li-ion batteries as a secondary battery system that can be used in large-scale commercial applications. However, the radius of Na ions is 55% larger than that of Li ions, which makes it difficult to effectively intercalate and desorb Na ions in electrode materials. Some materials that can be successfully used in lithium-ion batteries, such as graphite, are not suitable for sodium-ion batteries. Research a...

Claims

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Application Information

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IPC IPC(8): H01M4/38H01M4/583H01M4/1393H01M4/1395H01M10/36
CPCH01M4/1393H01M4/1395H01M4/38H01M4/583H01M10/36Y02E60/10
Inventor 张治安杨富华付云赖延清
Owner CENT SOUTH UNIV
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