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Three-dimensional-antimony/carbon network structure composite material, preparation method and application thereof

A technology of network structure and composite material, which is applied in the field of three-dimensional-antimony/carbon network structure composite material and its preparation, and achieves the effects of improving cycle stability, high structural stability and short operation period

Active Publication Date: 2017-11-17
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the use of three-dimensional-antimony / carbon network structure composites as electrode materials has not been reported

Method used

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  • Three-dimensional-antimony/carbon network structure composite material, preparation method and application thereof
  • Three-dimensional-antimony/carbon network structure composite material, preparation method and application thereof
  • Three-dimensional-antimony/carbon network structure composite material, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] 1) Add 0.5g polyvinylpyrrolidone (PVP, K30) and 2.5g citric acid monohydrate into 50mL distilled water, stir until dissolved, and obtain a colorless transparent solution;

[0035] 2) Add 14.7g of sodium chloride to the above solution, mix and stir until dissolved;

[0036] 3) Add 0.456g of antimony chloride to the mixed solution, raise the temperature to 50°C, and stir for 30 minutes to finally obtain a colorless and transparent precursor solution;

[0037] 4) Rapidly transfer the precursor solution, pour liquid nitrogen into the solution, and quickly freeze the liquid nitrogen to obtain a crystalline solid, and dry it in a freeze dryer for 48 hours to sublimate the aqueous solution and maintain its shape;

[0038] 5) Calcining the dried product in a hydrogen atmosphere, the heating rate is 2°C / min, the calcination temperature is 700°C, and the calcination time is 6h;

[0039] 6) The obtained black product was washed with deionized water to remove NaCl, washed 3 times,...

Embodiment 2

[0045] 1) Add 0.5g polyvinylpyrrolidone (PVP, K30) and 2.5g citric acid monohydrate into 50mL distilled water, stir until dissolved, and obtain a colorless transparent solution;

[0046] 2) Add 11.76g of sodium chloride to the above solution, mix and stir until dissolved;

[0047] 3) Add 0.456g of antimony chloride to the mixed solution, raise the temperature to 50°C, and stir for 30 minutes to finally obtain a colorless and transparent precursor solution;

[0048] 4) Rapidly transfer the precursor solution, pour liquid nitrogen into the solution, and quickly freeze the liquid nitrogen to obtain a crystalline solid, and dry it in a freeze dryer for 48 hours to sublimate the aqueous solution and maintain its shape;

[0049] 5) Calcining the dried product in a hydrogen atmosphere, the heating rate is 2°C / min, the calcination temperature is 700°C, and the calcination time is 6h;

[0050] 6) The obtained black product was washed with deionized water to remove NaCl, washed 3 times...

Embodiment 3

[0053] 1) Add 0.5g polyvinylpyrrolidone (PVP, K30) and 2.5g citric acid monohydrate into 50mL distilled water, stir until dissolved, and obtain a colorless transparent solution;

[0054] 2) Add 8.82g of sodium chloride to the above solution, mix and stir until dissolved;

[0055] 3) Add 0.456g of antimony chloride to the mixed solution, raise the temperature to 50°C, and stir for 30 minutes to finally obtain a colorless and transparent precursor solution;

[0056] 4) Rapidly transfer the precursor solution, pour liquid nitrogen into the solution, and quickly freeze the liquid nitrogen to obtain a crystalline solid, and dry it in a freeze dryer for 48 hours to sublimate the aqueous solution and maintain its shape;

[0057] 5) Calcining the dried product in a hydrogen atmosphere, the heating rate is 2°C / min, the calcination temperature is 700°C, and the calcination time is 6h;

[0058] 6) The obtained black product was washed with deionized water to remove NaCl, washed 3 times,...

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Abstract

The invention relates to a three-dimensional-antimony / carbon network structure composite material and a preparation method of the three-dimensional-antimony / carbon network structure composite material. The material can be used as negative active material of a sodium-ion battery and has a continuous carbon skeleton network structure, and 0.5 to 2 microns holes are distributed on the network structure. Active substance antimony particles are evenly embedded in the carbon skeleton network structure, and the antimony particles are 50 to 200 nm big. The invention is to prepare the three-dimensional-antimony / carbon network structure composite material by combining a simple and practicable freeze-drying method with a high-temperature calcination method. While being used as the negative active material of the sodium-ion battery, the three-dimensional-antimony / carbon network structure composite material has excellent cycling stability, high capacity and good rate capability. Secondly, the preparation method of the invention is simple in process and could obtain a precursor solution by simply and practicably stirring, and obtain the three-dimensional-antimony / carbon network structure composite material by combining a freeze drying process and the follow-up calcination process to process the solution. The method is strong in feasibility, easy to be amplified, and suitable for market promotion, and meets the feature of efficient chemical.

Description

technical field [0001] The invention belongs to the technical field of nanometer materials and electrochemistry, and specifically relates to a three-dimensional-antimony / carbon network structure composite material and a preparation method thereof. The material can be used as a negative electrode active material of a sodium ion battery. Background technique [0002] Sodium-ion batteries have attracted extensive attention from researchers because of their rich natural resources of sodium, long cycle life, wide temperature range, no memory effect, and no environmental pollution. As an ideal alternative energy storage for lithium-ion batteries, they have developed rapidly. In recent years, alloying reaction-type negative electrode materials have attracted attention due to their high specific capacity, among which antimony (Sb) negative electrode materials have the characteristics of low cost and high theoretical specific capacity (660mAh / g), and are considered to be the most pote...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/054
CPCH01M4/364H01M4/38H01M4/625H01M10/054H01M2004/021Y02E60/10
Inventor 韩春华麦立强罗雯
Owner WUHAN UNIV OF TECH
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