Abstract

Flexible batteries based on Na‐ion have been regarded as one of the most promising advanced energy storage devices, which is primarily due to the natural abundance of sodium resources. In this chapter, a summary is given on the recent progress for flexible Na-ion batteries with aspect to cell configurations, electrolytes, electrode materials, and separators. It is expected that this summary can offer us some crucial guidance for future investigation, and meanwhile, promote the innovation of next-generation flexible smart batteries. In spite of some major challenges, some potential solutions with respect to the design of cell configuration and the development of advanced electrode materials and electrolytes need further studies in the near future.