Overlithiated Li_1+xNi_0.5Mn_1.5O₄ in all one dimensional architecture with conversion type α-Fe₂O₃: A new approach to eliminate irreversible capacity loss

We first report the fabrication of all one dimensional (1D) active materials based Li-ion power packs using conversion type anode (α-Fe₂O₃). Electrospining procedure has been used to prepare all the 1D nanostructures. Half-cell studies are performed with metallic Li to ascertain the electrochemical activity of the individual components. In order to overcome irreversible capacity loss (ICL) in α-Fe₂O₃, the high voltage cathode has been over lithiated electrochemically (Li_1.33Ni_0.5Mn_1.5O₄) prior to the full-cell assembly. The combined advantages of 1D nanostructure and a new over lithiation concept certainly provides the less amount of active material loading to mitigate ICL. On the other hand, all based cell Li_1.33Ni_0.5Mn_1.5O₄/1 M LiPF₆ gelled PVdF-HFP/α-Fe₂O₃ delivered an energy density of ∼193 Wh kg⁻¹ with working potential of ∼3.27 V and rendered ∼88% of initial reversible capacity after 60 cycles.