Abstract
While LiNixMnyCo1−x−yO2 (NMC) is one of the most widely used cathode materials for lithium-ion batteries (LIBs), the composition of NMC is evolving to Ni-rich NMC to achieve higher lithium capacity that fulfills the constant demand for LIBs with ever-higher energy densities. The change in the composition of NMC affects electrochemical features and electrode cross-talk, which explains the performance change during cycling. In this study, we introduce various NMC materials (LiNi0.5Mn0.3Co0.2O2, LiNi0.6Mn0.2Co0.2O2 and LiNi0.8Mn0.1Co0.1O2) to reveal how the NMC composition affects electrode cross-talk. The study reveals that NMC composition strongly affects transition metal dissolution; dissolution of manganese linearly decreases as its stoichiometric ratio in NMC decreases, while dissolution of nickel is only prominent in LiNi0.8Mn0.1Co0.1O2. Aged electrolyte samples are characterized with high-performance liquid chromatography, and two electrolyte decomposition species, C8H16O5 and C9H18O5, are identified across all samples.
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