Exceptional performance of a high voltage spinel LiNi_0.5Mn_1.5O₄ cathode in all one dimensional architectures with an anatase TiO₂ anode by electrospinning

We report for the first time the synthesis and extraordinary performance of a high voltage spinel LiNi_0.5Mn_1.5O₄ fiber cathode in all one dimensional (1D) architecture. Structural and morphological features are analyzed by various characterization techniques. Li-insertion/extraction properties are evaluated in a half-cell assembly (Li/LiNi_0.5Mn_1.5O₄) and subsequently in full-cell configuration with an anatase TiO₂ fiber anode. In both half- and full-cell assemblies, gelled polyvinylidene fluoride-co-hexafluoropropylene (PVdF–HFP) is used as the separator-cum-electrolyte. All the one dimensional components used for fabricating Li-ion cells are prepared by a simple and scalable electrospinning technique. The full-cell, LiNi_0.5Mn_1.5O₄/gelled PVdF–HFP/TiO₂ delivered the reversible capacity of ∼102 mA h g⁻¹ at 0.1 C rate with an operating potential of ∼2.8 V. Excellent rate capability and stable cycling profiles are noted for such a full-cell assembly with a capacity retention of ∼86% after 400 cycles.