Nuclear magnetic resonance spectroscopy and differential capacity analysis as tools to study electrolyte consumption during the formation cycle of Li-ion pouch cells

This study investigates electrolyte consumption during the formation cycle of lithium-ion pouch cells through the integrated use of Nuclear Magnetic Resonance (NMR) spectroscopy and differential capacity (dQ/dV) analysis. By employing deuterated acetonitrile (ACN-d3) as the extraction solvent to facilitate NMR analysis, we quantitatively assess the degradation of electrolyte additives and solvent components across a range of voltages. By combining NMR and dQ/dV analysis, we gain a deeper understanding of how electrolytes break down and react through reduction and oxidation. These insights could help us develop more accurate models to predict battery degradation and performance. Early results indicate that NMR and dQ/dV findings align well, underscoring the potential of combining these techniques to accurately investigate electrolyte behavior during the formation process. This research represents a significant step forward in harnessing the combined power of NMR spectroscopy and dQ/dV analysis to advance the field of lithium-ion battery research. • Electrolyte consumption was studied during the formation cycle of Li-ion cells. • NMR and dQ/dV were used to quantify those consumptions. • NMR was performed at multiple voltages to decouple oxidation from reduction.