Understanding and Design of Cathode-Electrolyte Interphase in High-Voltage Lithium-Metal Batteries

The development of lithium-metal batteries (LMBs) has emerged as a mainstream approach for achieving high-energy-density energy storage devices. The stability of electrochemical interfaces plays an essential role in realizing stable and long-life LMBs. Despite extensive and comprehensive research on the lithium anode interface, there is limited focus on the cathode interface, particularly regarding high-voltage transition metal oxide cathode materials. In this review, the challenges associated with developing stable high-voltage cathode materials are first discussed. Characterization techniques for understanding the composition and structure of the cathode-electrolyte interphase (CEI) are then introduced. Subsequently, recent developments in electrolyte design and interface modification for constructing a stable CEI are summarized. Finally, perspectives on future research trends for understanding and developing the high-voltage CEI are discussed. This review can offer valuable guidance for understanding and designing the high-voltage CEI, pushing forward the development of high-energy-density LMBs. This review summarizes the challenges faced with the cathode-electrolyte interphase (CEI) in high-voltage lithium-metal batteries (LMBs), advanced characterization techniques for understanding the CEI chemistry and structure, as well as the recent developments in constructing stable CEI. Moreover, a perspective for the future research trends of the CEI is offered, serving as a guide for advancing the development of high-energy-density LMBs. image