Correlating Interfacial Li+ Exchange Rate with Reversible Cycling of Lithium Metal Anodes

7Li solid-state nuclear magnetic resonance (NMR) spectroscopy is a powerful technique for probing interfacial lithium-ion dynamics at the lithium metal/SEI interface in lithium-ion batteries.This database provides two openly available analysis scripts: (1) a script for analyzing selective inversion one-dimensional exchange (1D EXSY) NMR data of mixed SEI–lithium metal systems, enabling quantitative extraction of the Li⁺ exchange rate between the SEI and lithium metal; and (2) a script for analyzing saturation-recovery relaxation behavior of mixed systems consisting of single-component SEI phases (e.g., Li2O) and lithium metal, which likewise allows determination of the Li⁺ exchange rate across the SEI–Li interface.