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Hollow spherical cerium dioxide nano material and preparation method and application thereof

A technology of hollow spherical ceria, which is applied in secondary batteries, electrochemical generators, active material electrodes, etc., can solve the problem of low specific capacity, rate performance and cycle stability, and difficult control of the specific surface area of ​​hollow spherical ceria , unable to control the hollow spherical shell, etc., to achieve excellent circulation, easy process operation, and good application prospects

Active Publication Date: 2021-06-04
QILU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when cerium oxide is used as the electrode material, the volume of cerium ions expands due to the change of valence state when the electrode is charged and discharged, which makes the electrode easy to collapse and lead to a sharp drop in performance.
[0005] In the application process of cerium oxide, due to its poor electrical conductivity, its performance cannot achieve good results. For example, when cerium oxide is used as an electrode material for lithium-ion batteries, due to its low electrical conductivity, its specific capacity , rate performance and cycle stability are low
The preparation process is complex and requires the etching of the template, which is not conducive to large-scale production
[0007] After research by the inventors, it was found that the preparation of hollow spherical ceria in the above-mentioned patent not only requires a template, but the preparation method is complicated, and it is impossible to control the shell of the hollow sphere, and it is difficult to control the specific surface area and lithium ion storage site of the hollow spherical ceria. control

Method used

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  • Hollow spherical cerium dioxide nano material and preparation method and application thereof
  • Hollow spherical cerium dioxide nano material and preparation method and application thereof
  • Hollow spherical cerium dioxide nano material and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] (1) Dissolve 0.130 g of glucose in 20 mL of ultrapure water.

[0064] (2) Dissolve 0.376g of urea in 12mL of ultrapure water.

[0065] (3) 0.068g CeCl 3 ·7H 2 O was added to the solution obtained in step (2).

[0066] (4) Add the solution obtained in step (3) into the solution obtained in step (1) under constant stirring, and continue stirring for 30 min.

[0067] (5) Transfer the mixed solution obtained in step (4) to a 100 mL polytetrafluoroethylene-lined autoclave.

[0068] (6) Tighten the autoclave in step (5) and put it into an oven, keep it warm at 160° C. for 20 hours, and then cool it down to room temperature naturally.

[0069] (7) The precipitate obtained in step (6) was centrifuged, washed with distilled water and ethanol three times respectively, dried in a blast drying oven at 80° C. for 24 hours, and ground to collect the product.

[0070] (8) Keep the solid powder obtained in step (7) in a muffle furnace at 400° C. for 450 min, and calcinate to obtai...

Embodiment 2

[0073] (1) Dissolve 0.130 g of glucose in 32 mL of ultrapure water.

[0074] (2) 0.068g CeCl 3 ·7H 2 O was added to the solution obtained in step (1), and stirring was continued for 30 min.

[0075] (3) Transfer the mixed solution obtained in step (2) to a 100 mL polytetrafluoroethylene-lined autoclave.

[0076] (4) Tighten the autoclave in step (3) and put it into an oven, keep it warm at 160° C. for 20 hours, and then cool it down to room temperature naturally.

[0077] (5) The precipitate obtained in step (4) was centrifuged, washed three times with distilled water and ethanol, dried in a blast drying oven at 80° C. for 24 hours, and ground to collect the product.

[0078] (6) Keep the solid powder obtained in step (5) in a muffle furnace at 400° C. for 450 min, and calcinate to obtain a hollow spherical single-shell structure ceria nanomaterial.

[0079] Observation by transmission electron microscope, such as figure 2 As shown, the ceria nanomaterial prepared by thi...

Embodiment 3

[0081] (1) Dissolve 0.260 g of glucose in 20 mL of ultrapure water.

[0082] (2) Dissolve 0.188g of urea in 12mL of ultrapure water.

[0083] (3) 0.067g CeCl 3 ·7H 2 O was added to the solution obtained in step (2).

[0084] (4) Add the solution obtained in step (3) into the solution obtained in step (1) under constant stirring, and continue stirring for 30 min.

[0085] (5) Transfer the mixed solution obtained in step (4) to a 100 mL polytetrafluoroethylene-lined autoclave.

[0086] (6) Tighten the autoclave in step (5) and put it into an oven, keep it warm at 160° C. for 20 hours, and then cool it down to room temperature naturally.

[0087] (7) The precipitate obtained in step (6) was centrifuged, washed with distilled water and ethanol three times respectively, dried in a blast drying oven at 80° C. for 24 hours, and ground to collect the product.

[0088] (8) Keep the solid powder obtained in step (7) in a muffle furnace at 400° C. for 450 min, and calcinate to obtai...

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Abstract

The invention discloses a hollow spherical cerium dioxide nano material and a preparation method and application thereof. The preparation method comprises: glucose serving as a carbon source, urea serving as a precipitator, cerium trichloride serving as a cerium source, water serving as a solvent, and preparing a cerium dioxide / carbon composite material through a hydrothermal method; and calcining in a muffle furnace to obtain the hollow spherical multi-shell structure cerium dioxide nano material. The number of shell layers of the material can be adjusted by adjusting the amount of urea and the calcination temperature. In the process, the preparation method is simple, the preparation process is safe, environment-friendly, low in energy consumption and high in operability. According to the cerium dioxide nano material with the hollow spherical structure prepared in the invention, the number of shell layers can be adjusted, the shell layer spacing is relatively large, the specific surface area can be increased, the contact area between the material and an electrolyte is increased, and the structure collapse caused by volume expansion of an electrode material in the charging and discharging process can be relieved. The electrochemical performance is effectively improved.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and relates to a hollow spherical ceria nanometer material, a preparation method and an application. Background technique [0002] The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily taken as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. [0003] As a rare earth metal oxide, cerium oxide has two oxidation states (Ce 3+ and Ce 4+ ), has a unique chemical characteristic of redox, which makes it widely used in the fields of catalysis, secondary batteries (such as lithium-ion batteries, lithium-sulfur batteries, etc.) and supercapacitors. [0004] Whether ceria is used as a catalytic material or an electrode material, its performance depends greatly on its specific surface area...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/485H01M4/62H01M10/0525
CPCH01M4/485H01M4/625H01M10/0525H01M2004/027Y02E60/10C01P2004/34C01P2004/62C01F17/235C01P2004/04C01P2002/72C01P2006/40B82Y30/00H01M50/417H01M4/131H01M10/052B82Y40/00C01P2004/64H01M4/13H01M4/483H01M10/0568H01M10/0569H01M2004/021H01M2300/004
Inventor 周国伟宫庆华任永强姜越张蓓高婷婷孙学凤
Owner QILU UNIV OF TECH
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