Scope This record contains electrochemical impedance spectroscopy (EIS) measurements of the NMC cathode from an LG CHEM INR18650-MJ1 lithium-ion cell, structured for machine-readable applications. The dataset includes Parquet files with harmonized tabular impedance data, suitable for computational pipelines, and optionally linked data in JSON-LD format for semantic annotation. These measurements were recorded at 25°C and cover both charge and discharge sequences over the full SOC range. Files Data Filename Description Format Usage 18650_LG_3500_MJ1_EIS_cathode_charge.parquet Structured impedance spectrum of NMC cathode at indicated SOC and 25°C. application/parquet Use in data science pipelines or impedance modeling. 18650_LG_3500_MJ1_EIS_cathode_discharge.parquet Structured impedance spectrum of NMC cathode at indicated SOC and 25°C. application/parquet Use in data science pipelines or impedance modeling. RDF Metadata Filename Description Format Usage ro-crate-metadata.json RDF metadata describing the data table schema, test, and battery application/json+ld Semantic Web integration ro-crate-preview.html RDF metadata describing the data table schema, test, and battery application/json+ld Semantic Web integration Related Resources Relationship Name Description isPartOf INR18650-LG-3500-MJ1 Cathode Structured Data Collection This collection contains records with structured data files representing GITT measurements on the positive electrode (cathode) harvested from an INR18650-MJ1 Li-ion battery cell. The active material in the electrode is NMC. The measurment is obtained in three-electrode configuration with the working electrode NMC, counter electrode composite graphite/silicon oxide, and reference electrode lithium metal in a coin cell casing. The records include raw data obtained from GITT and EIS measurements. The data is intended to be used to charactrize the open-circuit potential and lithium diffusion coefficient in the NMC material to support model-based analysis of MJ1 cells. Continues INR18650-LG-3500-MJ1 Cathode EIS Raw Data This record contains Electrochemical Impedance Spectroscopy (EIS) measurements at 25°C of NMC cathodes harvested from an INR18650-MJ1 lithium-ion battery cell manufactured by LG CHEM. Continues INR18650-LG-3500 Cathode EIS Data Preprocessing This record contains workflows for packaging EIS measurements of an INR18650-MJ1 battery cell cathode from LG CHEM at 25°C. Licensing This dataset is licensed under CC-BY 4.0, allowing for sharing and adaptation with proper attribution. Contact Information For questions or further assistance, please contact Dennis Kopljar at dennis.kopljar@dlr.de. References This dataset is linked to the following publication: [DOI/Link to publication].