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Carbon negative electrode material for sodium ion battery and preparation method of carbon negative electrode material

A carbon negative electrode material and sodium-ion battery technology, applied in battery electrodes, circuits, electrical components, etc., can solve problems such as low degree of graphitization, weak sodium storage capacity, and mismatched layer spacing, achieving good repeatability and low cost. Inexpensive, well-sourced effects

Active Publication Date: 2017-07-07
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, although graphite has a high lithium storage capacity, its ability to store sodium is very weak, which is generally believed to be caused by the mismatch between the radius of sodium ions and the spacing between graphite layers.
Amorphous carbon has a low degree of graphitization, and its structure is mainly composed of a large number of disordered carbon crystallites interlaced. The graphite layer spacing is large and contains a large number of nanopores, which provide ideal active sites for the storage of sodium ions. Therefore, amorphous carbon materials have high reversible sodium storage capacity, but such materials have poor cycle stability and fast capacity decay, which greatly limits their application in sodium-ion batteries.

Method used

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  • Carbon negative electrode material for sodium ion battery and preparation method of carbon negative electrode material
  • Carbon negative electrode material for sodium ion battery and preparation method of carbon negative electrode material
  • Carbon negative electrode material for sodium ion battery and preparation method of carbon negative electrode material

Examples

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Effect test

Embodiment 1

[0057] First weigh 3.0kg of gelatin and dissolve it in 5L of deionized water, heat it to 80°C with stirring in an oil bath to form a transparent gelatin solution; then weigh 1.36kg of zinc chloride, 0.15kg of N-methylpyrrolidone, 0.81 kg of nickel chloride was dissolved in water to form a solution; the latter was slowly added to the gelatin solution under magnetic stirring conditions, and after stirring evenly, the resulting mixed solution was sprayed and pyrolyzed at 900°C; the obtained pyrolysis product was used Washed with ion water and alcohol, placed under the temperature condition of 80° C., and vacuum-dried for 10 hours to obtain a composite structure carbon negative electrode material.

[0058] The nickel carbonate nano-electrode material of the sodium ion battery prepared in this example and the sodium sheet are assembled into a button battery, and its material structure characterization and electrochemical performance are shown in the figure:

[0059] figure 1 The c...

Embodiment 2

[0065] First weigh 3.0kg of gelatin and dissolve it in 5L of deionized water, heat it to 80°C with stirring in an oil bath to form a transparent gelatin solution; then weigh 1.02kg of zinc chloride, 0.1kg of N-methylpyrrolidone, 0.60 kg of nickel chloride was dissolved in water to form a solution; the latter was slowly added to the gelatin solution under magnetic stirring conditions, and after stirring evenly, the resulting mixed solution was sprayed and pyrolyzed at 1000°C; the obtained pyrolysis product was used Washed with ion water and alcohol, placed at 80° C., and vacuum-dried for 12 hours to obtain a carbon negative electrode material with a composite structure.

[0066] The composite structure carbon negative electrode material prepared by this method is a loose, porous, spherical material with a rough surface, wherein the carbon composite nanoparticle (the composite structure carbon negative electrode material prepared in this embodiment) has a size of 120-600 nm.

[...

Embodiment 3

[0069] First weigh 3.0kg of gelatin and dissolve it in 5L of deionized water, heat it to 80°C under stirring in an oil bath to form a transparent gelatin solution; then weigh 1.02kg of zinc chloride, 0.1kg of N-methylpyrrolidone, 0.81 kg of nickel chloride was dissolved in water to form a solution; the latter was slowly added to the gelatin solution under magnetic stirring conditions, and after stirring evenly, the resulting mixed solution was sprayed and pyrolyzed at 800°C; the obtained pyrolysis product was used Washed with ion water and alcohol, placed at 80° C., and vacuum-dried for 8 hours to obtain a composite structure carbon negative electrode material.

[0070] The composite structure carbon negative electrode material prepared by this method is a loose, porous, spherical material with a rough surface, wherein the carbon composite nanoparticle (the composite structure carbon negative electrode material prepared in this embodiment) has a size of 100-800 nm.

[0071] Th...

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Abstract

The invention discloses a preparation method of a carbon negative electrode material for a sodium ion battery. The preparation method comprises the steps of performing spray pyrolysis on solution of a carbon-containing nitrogen source, an activating agent, a surfactant and a nickel salt, and washing and drying the obtained product to prepare the carbon negative electrode material. Moreover, the invention also discloses the carbon negative electrode material obtained by employing the preparation method. The composite structure carbon negative electrode material prepared by the method is a carbon sphere with certain graphitized degree and rich pores, and the carbon negative electrode material has low potential, high specific capacity and excellent cycle performance when used as a negative electrode material of the sodium ion battery; and moreover, the preparation method is simple and is low in cost and has wide industrial application prospect.

Description

technical field [0001] The invention relates to a negative electrode material of a sodium ion battery and a preparation method thereof, in particular to a composite structure carbon negative electrode material for a sodium ion battery and a preparation method thereof, belonging to the field of sodium ion batteries. Background technique [0002] With the rapid development of lithium-ion batteries, especially the large-scale application of batteries in electric vehicles and grid energy storage in the future, the challenges brought about by the shortage of lithium resources, uneven distribution and rising prices in the future are increasingly recognized by people. Therefore, researchers focus on sodium-ion batteries. Due to the similarity between the properties of sodium and lithium and the uniformity and abundance of sodium resource distribution, sodium-ion batteries are considered as potential substitutes for lithium-ion batteries. [0003] In recent years, research efforts ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62
CPCH01M4/625Y02E60/10
Inventor 张治安杜柯宋俊肖赖延清张凯李劼
Owner CENT SOUTH UNIV
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