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Sulfur-Driven Structural Reinforcement for Long-Life Zn-Ion Storage.

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Sulfur-doped vanadium dioxide (S-VO2) enhances aqueous zinc-ion batteries (AZIBs) by improving cathode stability and charge transport. This novel material offers superior capacity and long-term durability for advanced energy storage.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • High-performance cathode materials are essential for advancing aqueous zinc-ion batteries (ZIBs).
  • Challenges include enhancing stability and charge transport kinetics while suppressing material degradation.

Purpose of the Study:

  • To develop a novel cathode material for ZIBs using sulfur-doped vanadium dioxide (S-VO2).
  • To investigate the effects of sulfur incorporation on electronic structure, vanadium dissolution, and electrochemical performance.

Main Methods:

  • Synthesis of S-VO2 cathode material.
  • Electrochemical testing including specific capacity, cycling stability, and rate capability.
  • Material characterization using ex situ XRD, in situ Raman, XPS, XANES, and EXAFS.

Main Results:

  • S-VO2 cathode delivered a high specific capacity of 386.3 mA h g-1 at 0.1 A g-1.
  • Excellent long-term cycling stability with 79.6% capacity retention after 1600 cycles at 2.0 A g-1 and 80.3% after 6000 cycles at 10.0 A g-1.
  • Sulfur doping induced oxygen vacancies, enhanced conductivity, strengthened V-O bonds, and stabilized vanadium's local coordination environment.

Conclusions:

  • Sulfur doping is an effective strategy to improve the performance and stability of VO2-based cathodes for ZIBs.
  • The synergistic effect of sulfur doping and oxygen defects optimizes cathode material design for next-generation AZIBs.
  • S-VO2 offers a promising pathway towards high-performance and reliable aqueous zinc-ion battery systems.