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Related Experiment Video

Updated: Jan 29, 2026

Focused Ion Beam Fabrication of LiPON-based Solid-state Lithium-ion Nanobatteries for In Situ Testing

Focused Ion Beam Fabrication of LiPON-based Solid-state Lithium-ion Nanobatteries for In Situ Testing

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Correlated terahertz phonon-ion interactions control ion conduction in a solid electrolyte.

Kim H Pham¹, Kiarash Gordiz², Natan A Spear³

¹Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California 91125, USA. scushing@caltech.edu.

Materials Horizons

|January 28, 2026

Summary

Researchers found that exciting specific lattice vibrations, or phonon-ion hopping modes, in lithium lanthanum titanium oxide (LLTO) significantly boosts lithium-ion (Li+) conductivity. This discovery offers new pathways for developing advanced solid-state electrolytes for batteries.

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Dynamic Electrochemical Measurement of Chloride Ions

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Dynamic Electrochemical Measurement of Chloride Ions

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Published on: February 5, 2016

Area of Science:

Solid-state ionics
Materials science
Condensed matter physics

Background:

Ionic conduction in solids is crucial for energy storage technologies.
High ionic conductivity (>1 mS cm ^-1) is often linked to coupled phonon-ion interactions.
Understanding these interactions is key to designing efficient solid electrolytes.

Purpose of the Study:

To investigate the role of coupled phonon-ion hopping modes in enhancing Li ⁺ migration in Li _0.5La _0.5TiO ₃ (LLTO).
To explore targeted excitation of specific lattice vibrations for improved ion transport.

Main Methods:

Utilized *ab initio* calculations to predict the impact of exciting TiO ₆ rocking modes on Li ⁺ jump rates.
Employed terahertz (THz) illumination to coherently drive TiO ₆ rocking modes experimentally.
Used laser-driven ultrafast spectroscopy (LUIS) to differentiate responses from THz vibrations and ultrafast heating.

Main Results:

*Ab initio* calculations showed targeted excitation of TiO ₆ rocking modes significantly increases Li ⁺ jump rates.
THz illumination resulted in a ten-fold decrease in differential impedance compared to other phonon excitations.
LUIS revealed a unique, long-lived response for THz-range phonon excitation.

Conclusions:

THz-range coupled phonon-ion hopping modes play a critical role in enabling fast ion conduction in LLTO at room temperature.
Targeted excitation of specific lattice vibrations offers a promising strategy for enhancing ionic conductivity in solid electrolytes.
Findings provide new mechanistic insights into ion migration, relevant for solid-state battery development.