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Abstract Sodium (Na) metal is able to directly use as a battery anode but have a highly reductive ability of unavoidably occurring side reactions with organic electrolytes, resulting in interfacial instability as a primary factor in performance decay. Therefore, building stable Na metal anode is of utmost significance for both identifying the electrochemical performance of laboratory half‐cells employed for quantifying samples and securing the success of room‐temperature Na metal batteries. In this work, we propose an NaF‐rich interface rapidly prepared by pressure and diglyme‐induced defluorination reaction for stable Na metal anode. Once the electrolyte is dropped into the coin‐type cells followed by a slight squeeze, the Na metal surface immediately forms a protective layer consisting of amorphous carbon and NaF, effectively inhibiting the dendrite growth and dead Na. The resultant Na metal anode exhibits a long‐term cycling lifespan over 1800 h even under the area capacity of 3.0 mAh cm −2 . Furthermore, such a universal and facile method is readily applied in daily battery assembly regarding Na metal anode.
Zhang et al. (Wed,) studied this question.