Dataset of Pulse – Echo Ultrasonic A – Scan Signals for Derived Recovery Features of NMC – 622 Cathode Slurries during Post – Mixing Structural Evolution

This data article presents an open ultrasonic pulse – echo dataset acquired from NMC – 622 cathode slurries monitored under static conditions to characterise their post – mixing structural recovery behaviour. Slurries were prepared at varying solid contents of 63, 65, 67 and 69 wt.% and transferred into a fixed test container for ultrasonic monitoring. A 5 MHz contact transducer was used to record continuous A – Scan waveform under consistent acquisition settings (raw time – domain signals paired with frequency – domain representation). From each waveform, reflection amplitude and time – of – flight (ToF) features extracted from the slurry – air interface echo provides a compact representation of evolving acoustic response over time. The dataset is intended for benchmarking of signal processing pipelines, development of physics – informed feature extraction, and machine – learning models for slurry metrology and coating readiness assessment. By Packing signals, minimal metadata, and lightweight visualisation and analysis script, the resources enable reproducible reuse across materials – processing and signal – processing communities.