Iron oxide encapsulated titanium niobate nanotubes as a high-performance lithium-free anode for solid-state batteries

In the core–shell α-Fe₂O₃@TiNb₂O₇ nanofiber, the high rate character of TNO and high capacity of α-Fe₂O₃ work synergistically to provide enhanced specific capacity with prolonged cycle life and good rate capability, as a high performance Li-free solid-state battery anode.