Overlithiated Li1+xNi0.5Mn1.5O4 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 (Li1.33Ni0.5Mn1.5O4) 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 Li1.33Ni0.5Mn1.5O4/1 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.

Graphical abstractDownload high-res image (195KB)Download full-size image