Electrospinning Polyanionic Materials for High-Rate Na Storage

As emerging energy storage devices, sodium-ion batteries (SIBs) are perceived as promising alternatives to lithium-ion batteries (LIBs) due to their low cost and high safety. The cathodic side plays a crucial role in determining the energy density as well as the service life of SIBs, and the polyanionic cathode materials are featured by excellent cycle stability, flexible operating voltage and suitable overall electrochemical properties. However, the intrinsic inferior electronic conductivity limits their rate performance. Recently, the possibility of employing advanced electrospinning techniques to fabricate polyanionic materials has been explored. The facile electrospinning can greatly facilitate the ionic and electronic conduction of cathodes by constructing three-dimensional (3D) conductive networks with the one-dimensional (1D) nanofibers, and thus improves their electrochemical performance. In this review, we summarize the research progress of the electro-spun polyanionic cathodic materials and their applications in SIBs, and present future prospects as well as challenges of the electro-spun polyanions faced to the ever-increasing demand of advanced energy storage.