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High-voltage Na3V2(PO4)2F3 cathodes enabled by low-valence metal cations.

Yutian Chen1, Deyan Luan2, Hao Zhao1

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Introducing low-valence metal ions into sodium-ion battery cathode material Na3V2(PO4)2F3 (NVPF) stabilizes fluorine bonds. This enhances battery performance, including voltage and energy density, for advanced energy storage applications.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Computational Chemistry

Background:

  • Sodium-ion batteries (SIBs) are a promising alternative to lithium-ion batteries.
  • Na3V2(PO4)2F3 (NVPF) is a high-performance cathode material for SIBs.
  • Fluorine loss and phase transition are critical issues affecting NVPF stability.

Purpose of the Study:

  • To develop a strategy for stabilizing the NVPF structure by modulating the local electronic structure of vanadium.
  • To investigate the mechanism of fluorine stabilization using computational and experimental methods.
  • To enhance the electrochemical performance of NVPF-based cathodes.

Main Methods:

  • Density Functional Theory (DFT) calculations to investigate fluorine stabilization mechanisms.
  • Doping NVPF with low-valence metal ions (Cu2+, Cd2+, Ag+).
  • Electrochemical testing to evaluate battery performance (voltage, energy density, cycling stability).

Main Results:

  • Doping NVPF with low-valence metal ions effectively shortens V-F bonds, mitigating fluorine loss.
  • Cu-doped NVPF (2.5%) exhibited a higher mid-working voltage (3.69 V) and energy density (447.7 Wh/kg).
  • The doped material showed excellent cycling stability with 83.3% capacity retention after 10,000 cycles at 20 C.

Conclusions:

  • Modulating the electronic structure of vanadium via doping is an effective strategy for stabilizing NVPF cathodes.
  • This approach significantly improves the electrochemical performance and durability of sodium-ion batteries.
  • The findings pave the way for developing advanced NVPF-based materials for high-energy-density storage.