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A battery is a galvanic cell that is used as a source of electrical power for specific applications. Modern batteries exist in a multitude of forms to accommodate various applications, from tiny button batteries such as those that power wristwatches to the very large batteries used to supply backup energy to municipal power grids. Some batteries are designed for single-use applications and cannot be recharged (primary cells), while others are based on conveniently reversible cell reactions that...
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Cobalt-Mediated Defect Engineering Endows High Reversible Amorphous VS4 Anode for Advanced Sodium-Ion Storage.

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Small (Weinheim an Der Bergstrasse, Germany)
|February 1, 2024
PubMed
Summary

Cobalt-doped amorphous VS4 wrapped in graphene oxide enhances sodium-ion battery performance. This defect engineering strategy improves kinetics and cycling stability for advanced energy storage applications.

Keywords:
Co dopingVS4amorphous structuredefect engineeringsodium‐ion storage

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Nanotechnology

Background:

  • Metal sulfides are promising anode materials for sodium-ion batteries (SIBs) due to their high theoretical capacity.
  • However, poor structural stability and sluggish kinetics lead to capacity decay and hinder practical applications.

Purpose of the Study:

  • To develop a cobalt-doped amorphous VS4 wrapped by reduced graphene oxide (Co0.5-VS4/rGO) for improved SIB performance.
  • To investigate the effect of cobalt doping and defect engineering on the electrochemical properties of VS4.

Main Methods:

  • Co-induced defect engineering strategy to synthesize Co0.5-VS4/rGO.
  • Electrochemical testing of the material as an anode in SIBs and sodium-ion capacitors.
  • Analysis of structure-property relationships.

Main Results:

  • Co0.5-VS4/rGO exhibits excellent rate capacities over 10 A g-1 and superior cycling stability at 5 A g-1 over 1600 cycles.
  • The enhanced performance is attributed to defects from Co doping, the amorphous structure, and the rGO substrate.
  • The material also shows promise in sodium-ion capacitors.

Conclusions:

  • Cobalt doping and defect engineering effectively boost the kinetics and stability of VS4 for sodium storage.
  • Amorphous metal sulfides, particularly Co0.5-VS4/rGO, are promising electrode materials for advanced batteries and capacitors.
  • This study provides insights into preparing amorphous functional materials for energy storage.