Operando Neutron Radiography Validates a Parameter-Free Transport–Kinetics Model for Thick Solid-State Battery Cathodes

Key Points

• The research aims to validate a parameter-free model for lithium transport in solid-state battery cathodes.
• Used operando neutron radiography to visualize lithium transport in thick cathodes.
• Derived microstructures and concentration-dependent solid diffusion from GITT measurements.
• Utilized tortuosity-weighted interfacial flux model for accurate predictions.
• Successfully reproduced lithium gradients in through-thickness measurements without fitted parameters.
• Demonstrated the accuracy of TWIF-Li in predicting interfacial flux.
• Showed improved understanding of solid diffusion in composite cathodes.