Regulating cathode electrical double layer via electrolyte engineering for stable cycling of NCM811 cathode at 4.8 V

Abstract

A novel electrolyte formulation is rationally designed in this work to regulate the cathode electrical double layer (EDL), which enables the LiNi_0.8Co_0.1Mn_0.1O₂ (NCM811) cathode to realize stable cycling at a high charge cutoff voltage of 4.8 V with superior capacity retention. The core design principle lies in the construction of an inner Helmholtz plane (IHP) that can form an anion-dominated cathode electrolyte interphase (CEI) on the NCM811 surface. This work pioneers a new “EDL engineering” strategy, which provides a promising strategy for the development of high-voltage lithium-ion batteries (LIBs) with excellent cycling stability.