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Related Concept Videos

Valence Bond Theory02:42

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Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
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Atomic Layer Deposition of Vanadium Dioxide and a Temperature-dependent Optical Model
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Validating the Electronic Structure of Vanadium Phosphate Cathode Materials.

Tristram Jenkins, Jose A Alarco, Bruce Cowie1

  • 1Australian Synchrotron, 800 Blackburn Road, Clayton, Victoria 3168, Australia.

ACS Applied Materials & Interfaces
|September 21, 2021
PubMed
Summary
This summary is machine-generated.

Alkali metal surface depletion in vanadium phosphate cathodes enhances battery performance by improving charge transfer and reducing diffusion limitations. This study clarifies electronic structure for better battery design.

Keywords:
Li3V2(PO4)3Na3V2(PO4)3X-ray absorption spectroscopyalkali-ion batteriescathode materialselectronic structurephosphatesvanadium phosphate

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Solid-State Chemistry

Background:

  • Understanding electrode material electronic structure is crucial for advancing rechargeable battery mechanisms.
  • Vanadium phosphates are promising cathode materials for alkali-ion batteries, but their performance is limited by diffusion and charge transfer kinetics.

Purpose of the Study:

  • To investigate the electronic structure, band positioning, and band gap of Na3V2(PO4)3, Li3V2(PO4)3, and K3V3(PO4)4·H2O.
  • To elucidate the role of surface properties in the electrochemical performance of these alkali metal vanadium phosphates.

Main Methods:

  • Synchrotron soft X-ray absorption spectroscopy (XAS) in fluorescence and electron yield modes.
  • Complementary experimental techniques.
  • Density functional theory (DFT) calculations.

Main Results:

  • XAS measurements revealed significant variations in surface-to-bulk atomic structure, vanadium oxidation states, and oxygen hole states.
  • An intrinsic alkali metal surface depletion was identified across the studied samples.
  • This surface depletion correlates with a raised Fermi level and improved surface charge transfer kinetics.

Conclusions:

  • Alkali metal surface depletion in vanadium phosphates creates a beneficial interface, enhancing charge transfer and mitigating diffusion limitations.
  • The findings provide insights into the electronic structure of alkali metal vanadium phosphates, guiding future battery material development.
  • Optimizing surface properties can significantly improve the performance of alkali-ion rechargeable batteries utilizing these cathode materials.