Unlocking Electrochemical-Driven Surface Oxygen Vacancies-Regulated Cathode–Electrolyte Interphase for Stabilizing Li-Ion Cells
Chenxi Yan·Dingtao Ma·Junjie Han·Longjun He·Na Tian·Yanyi Wang·Qiang Li·Ning Zhao·Lipeng Zhang·xing liu·Peixin Zhang·Xuanlong He
Abstract A stable cathode–electrolyte interphase (CEI) significantly enhances the durability of lithium-ion batteries; however, the intricate chemistry underlying its formation makes predesign exceedingly challenging. This work demonstrates that surface oxygen vacancy (OV) concentration dually regulates CEI thickness and composition. We develop an in situ strategy where Li 2 C 4 O 4 incorporation into LiCoO 2 (LCO) spontaneously decomposes during cycling, generating surface OVs. Combined experim