New Method Tracks Ion Motion in Battery Materials
The technique could sharpen models for solid-state batteries, though it is research-stage and has been shown on a single material.
Updated on Nov. 3, 2026 in Energy
Argonne National Laboratory researchers demonstrated 4D quasielastic neutron scattering (4D-QENS), a technique that rotates a single-crystal sample while exposing it to neutrons. The method was tested at the Spallation Neutron Source at Oak Ridge National Laboratory and revealed direct evidence of correlated ion motion in strontium chloride crystals. The work is research-stage, published in PRX Energy, not a shipped tool.
Why it matters
Understanding how ions move through solids is central to improving solid-state batteries, and the study's results agreed with earlier work on ion hopping between lattice sites. The technique gives researchers a finer-grained view of that motion than prior methods allowed.
The measurements used neutron scattering on single-crystal strontium chloride, which becomes a fast-ion conductor above 1,200 degrees Fahrenheit. The sample rotation approach itself is about 15 years old at pulsed neutron sources, and the new work applies it to 4D-QENS at a steady-state facility.
The players
Argonne National Laboratory
A U.S. Department of Energy national laboratory whose research spans energy storage, materials science, and neutron-based characterization.
Oak Ridge National Laboratory
A Department of Energy laboratory that operates the Spallation Neutron Source, a major facility for neutron scattering research.
Northwestern University
A research university whose materials science group contributed to the team studying ion transport in solid electrolytes.
Northern Illinois University
A public university in DeKalb, Illinois, that participated in the research team studying the crystal measurements.
The details
Quasielastic neutron scattering tracks how neutrons change speed and direction after striking atoms, which reveals how atoms move. In the 4D version, the team rotates a single crystal while exposing it to neutrons, adding a directional dimension that lets them chart ion movements in detail. Strontium chloride was chosen as the test material, and the measurements showed ions moving in correlated groups rather than independently.
Timeline
November 3, 2026: Argonne announced the study's publication in PRX Energy.
About 15 years ago: The sample rotation method was first used at pulsed neutron sources.
A few years ago: Questions about ion conductivity were studied in more limited scope.
The Tech Race
The work places Argonne and its partners alongside earlier neutron-scattering efforts at pulsed sources, now carried into a steady-state facility at Oak Ridge. The study frames future solid-state battery design as dependent on this kind of atomic-level ion-motion data.
This is research-stage work and no product or battery design has been released from it. The timeline for any practical application is not announced.
The takeaway
Watch for follow-on work applying 4D-QENS to more complex materials, which the researchers said is planned. Atomic-level ion data of this kind is expected to feed into the theoretical models used to design next-generation solid-state batteries.
Further reading
For broader context on how materials research is advancing battery science, see the Energy section.
Source note: This article includes information reported by Argonne National Laboratory.
