Electrostatic Regulation of Na+ Coordination Chemistry for High-Performance All-Solid-State Sodium Batteries

An electrostatic engineering strategy is proposed to regulate the Na + coordinated structure by employing a fluorinated metal–organic framework as an electron-rich model. The abundant electron-rich F sites can accelerate Na-salt disassociation while forcing anions into Na + coordination structure though electrostatic effect to weaken the Na–O coordination, thus promoting rapid Na + transport. Anion-rich weak Na + solvation structure is achieved and contributes to a highly stable inorganic-rich solid–electrolyte interphase, significantly enhances the interfacial stability toward Na anode. Impressively, Na/Na symmetric cell delivered stable Na plating/stripping over 2500 h, and the assembled all-solid-state sodium metal batteries demonstrated stable performance of over 2000 cycles under high rate of 2 C with capacity retention nearly 100%.