Non-aqueous synthesis of high-quality Prussian blue analogues for Na-ion batteries.

A microwave-assisted solvothermal (MW-ST) method was developed to synthesize high-quality Prussian blue analogues. The tuned NaFeHCF exhibits low water content as well as good thermal stability. It delivers a high initial discharge capacity of 150 mA h g -1 , good rate capability and cycling life over 500 cycles.