Research progress of preparation of Na/β″-Al₂O₃ solid electrolyte applied in sodium based batteries

Na/β″-Al₂O₃ has high Na⁺ conductivity and small electronic conductivity, corrosion resistance and a sufficient mechanical strength, and become one of the most concerned solid electrolyte. The production process, choice of raw materials, impurity control and influence were reviewed and the progress of key production technology, such as the preparation of Na/β″-Al₂O₃ powder, forming and Sintering, was introduced. The future directions of applications and development of Na/β″-Al₂O₃ as solid electrolyte were also prospected.