Revealing competitive interfacial reactions in high-energy Li–S batteries

Researchers visualized concentration-driven phase segregation within high-concentration interfacial layers in high-energy lithium–sulfur (Li–S) batteries on June 17, 2026. The study, published in Nature, utilized liquid-cell electrochemical transmission electron microscopy to reveal competitive interfacial reactions occurring under lean electrolyte conditions at different phase boundaries. This advanced imaging technique allowed for unprecedented observation of dynamic processes at the nanoscale, providing critical insights into the degradation mechanisms that limit the performance and cycle life of Li–S batteries. Understanding these interfacial reactions is crucial for developing next-generation battery technologies with higher energy densities and improved stability. The findings offer a pathway to designing more robust electrolytes and electrode materials, potentially accelerating the adoption of Li–S batteries for applications requiring high energy storage capacity.