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Carbon sphere coated cobalt selenide nano-composite material and preparation method and application thereof

A cobalt selenide nanometer and nanomaterial technology, applied in structural parts, electrical components, battery electrodes, etc., can solve problems such as cycle performance degradation, impact on battery cycle performance and rate performance, electrode structure collapse, etc., to achieve good electrochemical performance , excellent cycle stability, the effect of promoting close contact

Active Publication Date: 2019-06-25
PEKING UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Although sodium-ion batteries have the above advantages, there are still the following problems: 1. The mass of sodium ions is heavier and the radius is larger, resulting in slower deintercalation of sodium ions in electrode materials, which affects the cycle performance and rate performance of batteries; 2. , The redox potential of sodium is lower, resulting in a lower energy density of sodium-ion batteries than lithium-ion batteries
[0005] Although the above method can improve the cycle performance of sodium ion batteries to a certain extent, the improvement range is limited. The main reason may be that the above materials cannot effectively accommodate the volume of the negative electrode material caused by the insertion and extraction of sodium ions during the charge and discharge process. changes, thus leading to the collapse of the electrode structure, leading to a decrease in cycle performance

Method used

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  • Carbon sphere coated cobalt selenide nano-composite material and preparation method and application thereof
  • Carbon sphere coated cobalt selenide nano-composite material and preparation method and application thereof
  • Carbon sphere coated cobalt selenide nano-composite material and preparation method and application thereof

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Effect test

Embodiment 1

[0033] Dissolve 0.6 mol of cobalt nitrate and 0.2 mol of selenous acid in 80 mL of isopropanol, then add glycerol with a volume of 25% of the above solution, stir magnetically at 40°C for about 1 hour, and then conduct solvothermal at 120°C Reaction, after 12 hours of reaction, the reaction product was taken out, centrifuged, washed with ethanol, dried, and then carbonized. The carbonization reaction conditions were under nitrogen atmosphere, the heating rate was 3°C / min, the reaction temperature was 400°C, and the reaction time was 4h. , to obtain cobalt selenide nanocomposites wrapped in carbon spheres.

[0034] Such as figure 1 As shown, the cobalt selenide nanocomposite material wrapped by carbon spheres prepared above is a spherical material with a particle size of about 100nm, wherein the particle size of the cobalt selenide nanomaterial is 3-10nm, such as figure 2 shown.

[0035] Such as image 3 As shown, the positions and intensities of the diffraction peaks revea...

Embodiment 2

[0038] Dissolve 0.6 mol of cobalt nitrate and 0.2 mol of selenous acid in 80 mL of isopropanol, then add glycerol with 20% volume of the above solution, stir magnetically at 40°C for about 1 hour, and then conduct solvothermal at 120°C Reaction, after 12 hours of reaction, the reaction product was taken out, centrifuged, washed with ethanol, dried, and then carbonized. The carbonization reaction conditions were under nitrogen atmosphere, the heating rate was 3°C / min, the reaction temperature was 400°C, and the reaction time was 4h. , to obtain cobalt selenide nanocomposites wrapped in carbon spheres.

[0039] Such as Figure 5 As shown, the scanning electron microscope image shows that the particle size of the above material after carbonization is about 300nm.

Embodiment 3

[0041] Dissolve 0.6 mol of cobalt nitrate and 0.2 mol of selenous acid in 80 mL of isopropanol, then add glycerol with a volume of 13% of the above solution, stir magnetically at 40°C for about 1 hour, and then conduct solvothermal at 120°C Reaction, after 12 hours of reaction, the reaction product was taken out, centrifuged, washed with ethanol, dried, and then carbonized. The carbonization reaction conditions were under nitrogen atmosphere, the heating rate was 3°C / min, the reaction temperature was 400°C, and the reaction time was 4h. , to obtain cobalt selenide nanocomposites wrapped in carbon spheres.

[0042] Such as Figure 6 As shown, the scanning electron microscope image shows that the particle size of the above material after carbonization is about 500nm.

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Abstract

The invention discloses a carbon sphere coated cobalt selenide nano-composite material and a preparation method and an application thereof. The material includes a cobalt selenide nano-material with the particle size being 3-10nm and porous carbon spheres coating the cobalt selenide nano-material, wherein the particle size of the porous carbon spheres is 100-700nm. The nano-composite material usesthe porous carbon spheres to disperse cobalt selenide nano-material, and uses the porous carbon spheres to play a role of electron conduction at the same time. As a negative electrode material of sodium-ion batteries, the nano-composite material can accommodate the volume change of the cobalt selenide nano-material in the charging and discharging process and improve the cycle stability of the sodium-ion batteries.

Description

technical field [0001] The invention relates to a nanocomposite material, in particular to a cobalt selenide nanocomposite material wrapped in carbon spheres, a preparation method and application thereof. Background technique [0002] A sodium ion battery is a battery that realizes charging and discharging through the intercalation and deintercalation process of sodium ions between the positive and negative electrode materials. Compared with lithium-ion batteries, sodium-ion batteries have more abundant sodium reserves, wider distribution, and lower cost, and have similar physical and chemical properties to lithium. It is expected to replace traditional lithium-ion batteries in large-scale energy storage device applications. [0003] Although sodium-ion batteries have the above advantages, there are still the following problems: 1. The mass of sodium ions is heavier and the radius is larger, resulting in slower deintercalation of sodium ions in electrode materials, which aff...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/62
CPCY02E60/10
Inventor 侯仰龙梓杉阿里
Owner PEKING UNIV
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