READ ME File For 'Data set for Operando Detection of Gas Evolution from Lithium-Ion Batteries' Dataset DOI: 10.5258/SOTON/D3412 ReadMe Author: Liam Lu, University of Southampton This dataset supports the thesis entitled AWARDED BY: University of Southampton DATE OF AWARD: 2025 DESCRIPTION OF THE DATA [This should include a detailed description of the data, how it was collected/created, any specialist software needed to view the data] This dataset contains all the experimental data used to generate the figures included in the main text and supplementary material of the thesis 'Operando Detection of Gas Evolution from Lithium-Ion Batteries' The dataset contains 4 main folders. The first folder (Electrode Log and Cell Tracker) contains files that document the cells that were used during the thesis and details on the electrodes in said cells. The second folder (Methodology Data) contains all the key raw data obtained that was used during the development of the project methodology (Chapter 2). The third folder (Preliminary Tests Data) contains all the key raw data obtained that was used during the preliminary tests in the initial stages of the project (Chapter 2). The fourth folder (Results Data) contains all the key raw data used during for the results chapter in the thesis (Chapter 3, 4, and 5). Date of data collection: September 2020 - December 2024 Information about geographic location of data collection: University of Southampton, U.K. Date that the file was created: March 2025