Electrospun P2-type Na 2/3 (Fe 1/2 Mn 1/2 )O 2 hierarchical nano fibers as cathode material for sodium-ion batteries

Sodium-ion batteries can be the best alternative to lithium-ion batteries, because of their similar electrochemistry, nontoxicity, and elemental abundance and the low cost of sodium. They still stand in need of better cathodes in terms of their structural and electrochemical aspects.