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Modular MPS3-Based Frameworks for Superionic Conduction of Monovalent and Multivalent Ions.

Zachery W B Iton1, Zion Irving-Singh2, Son-Jong Hwang2

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Researchers developed a new method for next-generation batteries using ligand-coordinated ions in M M PS3-based crystals. This approach enables superionic conductivity at room temperature, paving the way for safer, cheaper, and higher-capacity energy storage solutions.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Solid-State Chemistry

Background:

  • Current lithium-ion batteries face limitations in performance, safety, and cost.
  • Next-generation batteries utilizing "beyond-Li" ions, particularly multivalent ions, are hindered by a poor understanding of their solid-state ion conduction.
  • Developing advanced battery technologies requires exploring new materials and ion conduction mechanisms.

Purpose of the Study:

  • To introduce a novel ligand-assisted ion conduction mechanism in M M PS3-based solid host crystals.
  • To enable ambient temperature superionic conductivity for various next-generation mobile ions.
  • To investigate the influence of host structure, mobile ions, and coordinating ligands on ionic conductivity.

Main Methods:

  • Synthesis of ligand-coordinated ions within M M PS3 (M = Mn, Cd) solid host crystals.
  • Investigation of ionic conductivity using pulsed-field gradient nuclear magnetic resonance (PFG-NMR) spectroscopy.
  • Analysis of ion migration mechanisms, distinguishing between hopping and vehicular transport.

Main Results:

  • Ligand coordination significantly increased interlayer spacing and screened charge-dense ions, facilitating ion migration.
  • Ambient temperature superionic conductivity was achieved in M M PS3-based solids with ligand-assisted conduction.
  • PFG-NMR revealed a hopping conduction mechanism involving cations moving between H2O molecules.

Conclusions:

  • Ligand-assisted solid-state ionic conductivity is strongly influenced by cation charge density, diffusion channel size, and charge screening.
  • The modular system allows for tailoring to specific battery applications and probing fundamental conduction principles.
  • This research provides insights for designing novel solid-state ionic conductors, especially for multivalent ions, and M M PS3 frameworks may serve as universal solid-state electrolytes.