Neutron Imaging Reveals Uneven Lithium Flow in Solid-State Batteries

Researchers used neutron imaging to track lithium movement in a working solid-state battery, uncovering uneven charging patterns that could inform future design improvements.

This article was drafted with AI assistance from multiple sources and was reviewed and approved by a human editor before publication.

A team of scientists has employed neutron imaging to observe lithium distribution inside a functioning solid-state battery, revealing that charging does not occur uniformly. The study, published on July 11, 2026, provides a direct visualization of lithium-ion transport in a solid electrolyte, which is critical for developing safer and more efficient energy storage.

Most rechargeable batteries rely on a liquid electrolyte to shuttle lithium ions between electrodes during charge and discharge cycles. However, liquid electrolytes pose safety risks, such as flammability, and limit performance gains. Solid-state batteries replace the liquid with a solid material, promising higher energy density and improved safety. Yet, understanding how lithium moves through the solid electrolyte has been challenging due to the difficulty of imaging inside an operating device.

The researchers used neutron beams, which are highly sensitive to lithium, to map its concentration in real time. They found that lithium ions accumulate unevenly, leading to regions with high and low concentrations. This non-uniform distribution can cause stress and degradation, reducing battery life and efficiency. The findings highlight the need for engineering solutions to promote homogeneous lithium transport.

The work was conducted at a neutron scattering facility, leveraging the unique ability of neutrons to penetrate battery materials without damaging them. The team hopes these insights will guide the design of solid-state batteries with more consistent charging behavior, accelerating their adoption in electric vehicles and portable electronics.