Anomalous high ionic conductivity of nanoporous β-Li3PS4

Area of Science:

• Materials Science
• Electrochemistry
• Solid-State Chemistry

Background:

• Solid electrolytes are crucial for developing safer, high-energy lithium batteries.
• Achieving high ionic conductivity and a wide electrochemical window simultaneously in solid electrolytes remains a significant challenge.
• Conventional lithium batteries pose safety risks due to flammable liquid electrolytes.

Purpose of the Study:

• To enhance the ionic conductivity of lithium thiophosphate (Li(3)PS(4)) solid electrolytes.
• To investigate the effect of nanostructuring on the properties of Li(3)PS(4).
• To explore the potential of nanostructured Li(3)PS(4) for advanced battery applications.

Main Methods:

• Synthesis of nanostructured Li(3)PS(4).
• Measurement of room-temperature lithium-ion conductivity.
• Evaluation of electrochemical window and chemical stability against lithium metal.

Main Results:

• Achieved a 3-orders-of-magnitude enhancement in room-temperature lithium-ion conductivity.
• Demonstrated a wide electrochemical window of 5 V for the nanostructured material.
• Exhibited superior chemical stability of nanoporous Li(3)PS(4) against lithium metal.
• Stabilized the high-conduction β phase at room temperature via nanostructuring.
• Promoted surface conduction due to the high surface-to-bulk ratio.

Conclusions:

• Nanostructuring Li(3)PS(4) effectively enhances ionic conductivity and electrochemical stability.
• The developed material offers a promising alternative to conventional lithium battery electrolytes.
• This work has broad implications for designing solid electrolytes for various energy storage and conversion devices.