Abstract
Ni-rich cathodes are a class of materials for lithium-ion batteries (LIBs), which are currently gaining popularity in applications requiring high energy density, such as electric vehicles (EVs). Successful integration of these materials into EVs necessitates a fundamental understanding of their electrochemical properties, including the open circuit potential (OCP) curve. This study investigates the relationship between Ni stoichiometry and the OCP curve of two cathode families: Ni-rich NCAs and Ni-rich NCMs with a constant Mn content of 20%. First, it demonstrates how to predict the OCP curves of the materials within these two cathode families. Then, it applies the same methodology to determine the Ni content in a Ni-rich NCA cathode with an unknown chemical formula with similar accuracy as the inductively coupled plasma (ICP) technique. Our results suggest that the presented methodology can be further extended to additional cathode families and aid both in the prediction of their OCP curves and in validating the stoichiometry of newly synthesized materials.
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