In Situ Engineering of the Electrode–Electrolyte Interface for Stabilized Overlithiated Cathodes

Author(s): Evans, T; Piper, DM; Sun, H; Porcelli, T; Kim, SC; Han, SS; Choi, YS; Tian, C; Nordlund, D; Doeff, MM; Ban, C; Cho, SJ; Oh, KH; Lee, SH | Abstract: Researchers demonstrate electrode–electrolyte interactions known to accelerate phase change in the lithium–manganese-rich (LMR) system. Leveraging the understandings of LMR interfacial Behavior, the researchers employ a unique electrolyte composition to form a cathode–electrolyte interface (CEI) that allows for the improved long-term capacity and energy retention of the LMR cathode. Our novel CEI is formed in situ through the oxidative decomposition of a room temperature ionic liquid (RTIL) electrolyte doped with a sacrificial fluorinated salt additive.