Supporting data for "Correlations between precipitation reactions and electrochemical performance of lithium-sulfur batteries"

<p>This is the dataset of electrochemical and operando small-angle and wide-angle scattering experiments for our publication &quot;Correlations between precipitation reactions and electrochemical performance of lithium-sulfur batteries probed by operando scattering techniques&quot;. The title of the article was changed in the revision process while this dataset was already published.&nbsp;This archive contains the raw data and scripts written in R used in the analysis and presentation of the results in this manuscript.</p> <p><strong>Abstract for the manuscript:</strong></p> <p>A comprehensive description of electrochemical processes in the positive electrode of lithium-sulfur batteries is crucial for the utiliza- tion of active material. However, the discharge mechanisms are complicated due to various reactions in multiple phases and the tor- tuosity of the highly porous carbon matrix. In this work, simulta- neous measurements of small-angle and wide-angle scattering and cell resistance are performed on operating lithium-sulfur cells. Re- sults indicate that precipitates grow mostly in number, not in size, and that the structure of the carbon matrix is not affected. The com- parison of the small-angle and wide-angle scattering reveals the amorphous discharge products found at a low discharge rate. Further analysis demonstrates the correlation between the diffusion resistance and the compositional change of electrolyte in the meso- pores at the end of discharge, which suggests that Li-ion deficiency is the limiting factor for sulfur utilization at a medium discharge rate.</p>