CBE Colloquia - Understanding and regulating dynamic interphases in advanced lithium batteries
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Electrode–electrolyte interphases critically influence the stability, reversibility, and lifespan of advanced lithium batteries. Their composition and structure are determined by electrolyte chemistry but continue to evolve during battery operation, making a mechanistic understanding of their origin, functionality, and dynamics essential for rational electrolyte design. This seminar presents our efforts to understand and regulate battery interphases through electrolyte engineering and advanced characterizations. The talk will cover the chemical origin, structural evolution, and dynamic behavior of lithium-metal interphases, as well as cathode interphase design for stabilizing high-voltage electrode materials and suppressing detrimental interfacial reactions. The synergistic regulation of interphases on both electrodes will also be explored as a strategy to enable lithium-ion batteries over a wide temperature range and improve sulfur conversion and interfacial stability in lithium–sulfur batteries. Together, these studies establish mechanistic connections among electrolyte chemistry, interphase evolution, and electrochemical performance, providing guidance for the design of more stable and durable lithium batteries.
Dr. Sha Tan is a Professor in the Department of Materials and Energy at the University of Electronic Science and Technology of China (UESTC). She received her Ph.D. in Chemistry from Stony Brook University and later worked as a postdoctoral researcher and staff scientist at Brookhaven National Laboratory. Dr. Tan’s research focuses on electrolyte and interphase chemistry in advanced lithium batteries, with particular emphasis on understanding the dynamic interphasial reactions using advanced synchrotron and operando characterization techniques. Her research aims to understand and control how the local electrolyte and interphase environment regulates the nucleation and growth of electrochemically formed phases on electrode surfaces through the coupled effects of ion transport, interfacial kinetics, and morphology evolution.