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Sodium-ion batteries show great potential as an alternative energy storage system, but safety concerns remain a major hurdle to their mass adoption. This paper analyzes the key factors and mechanisms leading to safety issues, including thermal runaway, sodium dendrite, internal short circuits, and gas release. Several promising solutions are proposed, such as high-safety electrode materials in the cathode and anode, high-safety electrolytes, and external battery management systems. Here in also we emphasize the importance of selecting appropriate analysis methods and developing reliable failur...

Sodium metal has been regarded as one of excellent candidates of anode materials for the next-generation high-energy sodium-ion batteries owing to its low redox potential, low cost, and high theoretical capacity. However, the poor reversibility and the dendrite growth of Na anode on cycling have significantly hindered the practical application of sodium metal anodes (SMAs). Herein, we report that a mixed-ion/electron-conducting interface (MIECI) layer, in-situ generated through the conversion of CuP2 into the mixed conductor of Cu and Na3P, enable dendrite-free Na plating/stripping in ether-ba...