A review of solid-state electrolyte/electrode interface stability optimisation studies

Researchers have found that all-solid-state batteries can solve the problems of leakage, poor thermal stability, and flammability of organic liquid electrolytes through the coupling process of solid-state electrolytes and lithium metal anodes. With the advantages of higher safety and energy density, wider temperature adaptability, and material selectivity, solid-state batteries are a revolutionary technology in the field of electric vehicles. However, the industrialization of all-solid-state batteries is still limited by the multi-scale coupling problem at the solid-solid interface. In this paper, we first analyze the interfacial failure mechanisms of solid-state batteries, including lithium metal deposition kinetics, space charge layer effects, and interfacial side-reaction thermodynamics. Secondly, it reviews the innovative strategies of atomic layer deposition (ALD) interface modification, electrolyte gradient design, and external field regulation. Finally, a collaborative multi-interface optimization route is proposed, and an outlook is given to enhance the electrochemical performance of Li-ion batteries through in-situ characterization techniques.This research not only provides critical insights into overcoming the key challenges of solid-state batteries but also paves the way for their large-scale commercialization, which could revolutionize energy storage and accelerate the global transition to sustainable electric mobility.