Research Progress on the Interface of NASICON-Structured Sodium Solid Electrolytes

Inorganic all-solid-state sodium batteries have emerged as promising alternatives to conventional lithium-ion batteries for large-scale energy storage systems, owing to their potential advantages, including abundant raw materials, enhanced safety, low cost, high energy density, and superior reliability and stability. Among their components, the sodium-ion solid-state electrolyte plays a pivotal role in ensuring both the safety and cycling stability of the system. This review begins by outlining the fundamental properties of NASICON-type electrolytes, including their ionic conductivity, mechanical strength, and chemical and electrochemical stability. It emphasizes how interface issues between electrode materials hinder the performance of solid-state batteries. The review also explores practical strategies for creating intimate interfaces between NASICON electrolytes and both cathodes and anodes, offering a critical analysis of the primary methods employed to optimize these interfaces. Finally, the current challenges and key perspectives for advancing interfacial contacts are discussed, providing insights into the potential developments and future directions for the practical application of all-solid-state electrolytes. This comprehensive review aims to contribute to the understanding and development of next-generation rechargeable all-solid-state batteries.