Spatially Confined in Situ Formed Sodiophilic-Conductive Network for High-Performance Sodium Metal Batteries.

The sodium (Na) metal anode encounters issues such as volume expansion and dendrite growth during cycling. Herein, a novel three-dimensional flexible composite Na metal anode was constructed through the conversion-alloying reaction between Na and ultrafine Sb 2 S 3 nanoparticles encapsulated within the electrospun carbon nanofibers (Sb 2 S 3 @CNFs). The formed sodiophilic Na 3 Sb sites and the high Na + -conducting Na 2 S matrix, coupled with CNFs, establish a spatially confined "sodiophilic-conductive" network, which effectively reduces the Na nucleation barrier, improves the Na + diffusion kinetics, and suppresses the volume expansion, thereby inhibiting the Na dendrite growth. Consequently, the Na/Sb 2 S 3 @CNFs electrode exhibits a high Coulombic efficiency (99.94%), exceptional lifespan (up to 2800 h) at high current densities (up to 5 mA cm -2 ), and high areal capacities (up to 5 mAh cm -2 ) in symmetric cells. The coin-type full cells assembled with a Na 3 V 2 (PO 4 ) 3 /C cathode demonstrate significant enhancement in electrochemical performance. The flexible pouch cell achieves an excellent energy density of 301 Wh kg -1 .