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Nanoscaled Na 3 PS 4 Solid Electrolyte for All-Solid-State FeS 2 /Na Batteries with Ultrahigh Initial Coulombic Efficiency of 95% and Excellent Cyclic Performances
Nanosized Na
PS
solid electrolyte with an ionic conductivity of 8.44 × 10
S cm
at room temperature is synthesized by a liquid-phase reaction. The resultant all-solid-state FeS
/Na
PS
/Na batteries show an extraordinary high initial Coulombic efficiency of 95% and demonstrate high energy density of 611 Wh kg
at current density of 20 mA g
at room temperature. The outstanding performances of the battery can be ascribed to good interface compatibility and intimate solid-solid contact at FeS
electrode/nanosized Na
PS
solid electrolytes interface. Meanwhile, excellent cycling stability is achieved for the battery after cycling at 60 mA g
for 100 cycles, showing a high capacity of 287 mAh g
with the capacity retention of 80%.