Electron Paramagnetic Resonance in Battery Research

This technical report discusses the application of Electron Paramagnetic Resonance (EPR) spectroscopy in battery research, particularly focusing on lithium-ion batteries. EPR is highlighted as a sensitive analytical technique for studying materials with unpaired electrons, which is crucial for understanding electrolyte reactions. The report details how EPR can detect and quantify oxygen radicals, analyze redox mechanisms in cathode materials, and study electrolyte decomposition, thus providing insights into battery performance and capacity. Additionally, the report examines the stability of the cathode/electrolyte interface and presents findings on the impact of state of charge on the physical properties of the VO2+/VO2+ redox pair in all-vanadium redox flow batteries. The findings demonstrate EPR's role in investigating the degradation processes and the effects of redox mediators like lithium iodide in aprotic lithium-oxygen batteries. Overall, the report underscores EPR's significance in enhancing battery efficiency and durability by mitigating parasitic reactions.