New Study from the Chair of Technical Electrochemistry: Temperature Dependence of Chemical and Electrochemical Electrolyte Oxidation in Lithium-Ion Batteries with Ni-Rich CAMs — Gas Evolution, Salt Decomposition, and Metal Dissolution

In a recent study published in the Journal of The Electrochemical Society, the Chair of Technical Electrochemistry at TUM presents a detailed breakdown of the temperature-dependent chemical and electrochemical oxidation of the electrolyte, and its connection to key aging mechanisms such as LiPF₆ salt decomposition and transition metal dissolution from a LiNi₀.₈₀Co₀.₁₅Al₀.₀₅O₂ (NCA) cathode.

🔗 The full article is available open access: https://iopscience.iop.org/article/10.1149/1945-7111/ade0ec

Key highlights of the work:

💡 Identification of the structural stability limit and transition metal dissolution of Ni-rich NCA.

💡 Separation of chemical and electrochemical electrolyte oxidation via gas analysis.

💡 Analysis of the temperature-dependent rate of LiPF₆ hydrolysis.

💡 Operando hard X-ray absorption spectroscopy (XAS) used to study temperature-dependent transition metal dissolution.

💡 Correlation of gas evolution and operando XAS data reveals electrochemical electrolyte oxidation as the trigger for transition metal dissolution.