Path Dependent Battery Degradation: NCA 18650 Cell Aging Under Combined Loads

Twelve commercially available lithium-ion 18650 cells with nickel cobalt aluminium oxide (NCA) positive electrodes and graphite negative electrodes were subjected to combined load profiles to study path-dependent degradation. The dataset contains data from four experimental groups, each with three cells, where fixed periods of calendar aging and constant current constant voltage (CCCV) cycling were applied in different orders and durations. It includes data from the combined load profiles, reference performance tests, and electrochemical impedance spectroscopy measurements.

Use Cases

• Modeling path-dependent battery degradation based on the order and periodicity of calendar and cyclic aging events.
• Analyzing the impact of state of charge (90% vs. 100%) during calendar aging on long-term cell performance.
• Validating electrochemical impedance spectroscopy (EIS) data against reference performance test results for aging diagnosis.
• Comparing degradation rates between cells subjected to 1-day vs. 2-day cycling periods followed by calendar aging.

Strengths

• Dataset is derived from a controlled experiment with four distinct experimental groups, each containing three cells for statistical robustness.
• Includes multiple data modalities: combined load profile data, reference performance tests, and electrochemical impedance spectroscopy.
• Open Access (green) license facilitates reuse and sharing in academic and industrial research.

Limitations

• Key metadata such as row count, column names, and specific file formats are not provided in the available sources.
• The dataset's temporal coverage and the date of the last update are unknown, limiting assessment of freshness.
• The experimental scope is limited to one cell chemistry (NCA/graphite 18650) and specific aging protocols, which may affect generalizability.

Provenance

Source

University of Oxford, authored by Trishna Raj.

Collection Method

Laboratory experiment on twelve 18650 cells subjected to combined calendar and cyclic aging load profiles in four groups.