title: Synthesis of TiO2 hollow nanofibers by co-axial electrospinning and its superior lithium storage capability in full-cell assembly with olivine phosphate.
abstract: We report the formation and extraordinary Li-storage properties of TiO2 hollow nanofibers by co-axial electrospinning in both the half-cell and full-cell configurations. Li-insertion properties are first evaluated as anodes in the half-cell configuration (Li/TiO2 hollow nanofibers) and we found that reversible insertion of ~0.45 moles is feasible at a current density of 100 mA g(-1). The half-cell displayed a good cyclability and retained 84% of its initial reversible capacity after 300 galvanostatic cycles. The full-cell is fabricated with a commercially available olivine phase LiFePO4 cathode under optimized mass loading. The LiFePO4/TiO2 hollow nanofiber cell delivered a reversible capacity of 103 mA h g(-1) at a current density of 100 mA g(-1) with an operating potential of ~1.4 V. Excellent cyclability is noted for the full-cell configuration, irrespective of the applied current densities, and it retained 88% of reversible capacity after 300 cycles in ambient conditions at a current density of 100 mA g(-1).
authors.affiliation: Department of Mechanical Engineering, National University of Singapore, Singapore 117576, Singapore. seeram@nus.edu.sg.
authors.forename: X
authors.initials: X
authors.lastname: Zhang
authors.forename: V
authors.initials: V
authors.lastname: Aravindan
authors.forename: P Suresh
authors.initials: PS
authors.lastname: Kumar
authors.forename: H
authors.initials: H
authors.lastname: Liu
authors.forename: J
authors.initials: J
authors.lastname: Sundaramurthy
authors.forename: S
authors.initials: S
authors.lastname: Ramakrishna
authors.forename: S
authors.initials: S
authors.lastname: Madhavi