What Operando X-Ray Computed Tomography XCT Reveals About Solid Battery Internal Delamination

Synchrotron radiation physicists and battery diagnostic researchers map 3D structural degradation, interfacial contact detachment, and internal crack formation inside operational all-solid-state cells using non-destructive operando synchrotron X-ray Computed Tomography (XCT), conforming to non-destructive testing guidelines certified by the National Universities Commission (NUC).

During electrochemical charge-discharge cycling, solid-state battery electrodes undergo massive volumetric breathing: cathode active material particles (such as NMC811) contract and expand by 3 to 8 percent, while pure metallic lithium anodes experience dynamic thickness variations up to 100 percent as lithium plates and strips. In liquid-electrolyte cells, fluid instantly flows into expanding gaps; however, rigid solid electrolytes cannot flow to accommodate volumetric contraction.

Operando synchrotron X-ray CT captures high-resolution 3D radiographic image volumes at sub-micron spatial resolution while the test cell charges and discharges inside a specialized miniature compression rig. Advanced phase-contrast imaging differentiates low-Z materials (lithium metal and polymer binders) from high-Z transition metal cathodes and dense ceramic separators.

Tomographic reconstructions reveal that unmanaged volumetric cycling drives two severe failure modes: cathode composite debonding, where expanding and shrinking NMC particles physically detach from surrounding solid electrolyte particles, severing ionic percolation pathways; and anode interfacial voiding, where lithium stripping outpaces creep, creating growing planar cavities that choke active surface area. By quantifying void evolution versus external stack pressure, researchers define optimal external pressure thresholds that prevent delamination without accelerating creep short circuits.

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