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Abstract Development of high‐performance sodium metal batteries (SMBs) with a wide operating temperature range (from −40 to 55 °C) is highly challenging. Herein, an artificial hybrid interlayer composed of sodium phosphide (Na 3 P) and metal vanadium (V) is constructed for wide‐temperature‐range SMBs via vanadium phosphide pretreatment. As evidenced by simulation, the VP‐Na interlayer can regulate redistribution of Na + flux, which is beneficial for homogeneous Na deposition. Moreover, the experimental results confirm that the artificial hybrid interlayer possesses a high Young's modulus and a compact structure, which can effectively suppress Na dendrite growth and alleviate the parasitic reaction even at 55 °C. In addition, the VP‐Na interlayer exhibits the capability to knock down the kinetic barriers for fast Na + transportation, realizing a 30‐fold decrease in impedance at −40 °C. Symmetrical VP‐Na cells present a prolonged lifespan reaching 1200, 500, and 500 h at room temperature, 55 °C and −40 °C, respectively. In Na 3 V 2 (PO 4 ) 3 ||VP‐Na full cells, a high reversible capacity of 88, 89.8, and 50.3 mAh g −1 can be sustained after 1600, 1000, and 600 cycles at room temperature, 55 °C and −40 °C, respectively. The pretreatment formed artificial hybrid interlayer proves to be an effective strategy to achieve wide‐temperature‐range SMBs.
Xia et al. (Wed,) studied this question.