The major challenge for sodium metal anodes is Na dendrite growth owing to the unstable and fragile solid–electrolyte interphase (SEI), leading to terrible cycle life and safety hazards. Constructing a robust SEI around a 3D porous host is considered to be a facile and efficient approach to stabilize Na metal anodes. Here, a durable 3D porous SnCl 4 @Na–rGO metal anode is fabricated by the in situ chemical reaction of SnCl 4 ‐containing carbonate electrolyte with Na–rGO. Attributed to the robust SEI and the stereoscopic structure, the symmetric cells achieve a prolonged cycle life of 500 h without voltage fluctuation at 2 mA cm −2 and 2 mAh cm −2 . Moreover, the Na 3 V 2 (PO 4 ) 3 ||SnCl 4 @Na–rGO full cell exhibits long‐term cycle stability ( > 600 cycles) and remarkable capacity retention ( > 92%). The novel approach provides an efficacious strategy for the practical implementation of Na metal batteries.
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Lai et al. (2022) studied this question.