Fundamental interplay between anionic/cationic redox governing the kinetics and thermodynamics of lithium-rich cathodes.

ABSTRACT: Reversible anionic redox has rejuvenated the search for high-capacity lithium-ion battery cathodes. Real-world success necessitates the holistic mastering of this electrochemistry's kinetics, thermodynamics, and stability. Here we prove oxygen redox reactivity in the archetypical lithium- and manganese-rich layered cathodes through bulk-sensitive synchrotron-based spectroscopies, and elucidate their complete anionic/cationic charge-compensation mechanism. Furthermore, via various electroanalytical methods, we answer how the anionic/cationic interplay governs application-wise important issues-namely sluggish kinetics, large hysteresis, and voltage fade-that afflict these promising cathodes despite widespread industrial and academic efforts. We find that cationic redox is kinetically fast an

SUBMITTER: Assat G 

PROVIDER: S-EPMC5738393 | biostudies-literature | 2017 Dec

REPOSITORIES: biostudies-literature