Architecting robust interphase on high voltage cathodes via aromatic polyamide

Abstract High voltage cathodes are necessary for improving energy density of electrochemical energy storage devices, but face issues originated from the instable interface between cathodes and electrolytes. In this work, we report a novel strategy to enforce the interface stability of high voltage cathode by architecting an efficiently protective interphase via simply one-step treating the cathode materials with polymers. A representative high voltage cathode, lithium/manganese-rich oxide (LMR), is considered with a match of a polymer, aromatic polyamide (APA). Electrochemical measurements combining with physical characterizations and theoretical calculations demonstrate that a thin but robust interphase of 5 nm thick is successfully architected on LMR and consequently the cycling performances of LMR are significantly improved. This strategy is facile but efficient and therefore helpful for the application of high voltage cathodes in large scale.