Improving the specific capacity and electronic conductivity of TiO2 can boost its practical application as a promising anode material for lithium ion batteries. In this work, a three-dimensional networking oxygen-deficient nano TiO2-x/carbon fibre membrane was achieved by combining the electrospinning process with a hot-press sintering method and directly used as a self-standing anode. With the synergistic effects of three-dimensional conductive networks, surface oxygen deficiency, high specific surface area and high porosity, binder-free and self-standing structure, etc., the nano TiO2-x/carbon fibre membrane electrode displays a high electrochemical reaction kinetics and a high specific capacity. The reversible capacity could be jointly generated from porous carbon, full-lithiation of TiO2 and interfacial lithium storage. At a current density of 100 mA g−1, the reversible discharge capacity can reach 464 mA h g−1. Even at 500 mA g−1, the discharge capacity still remains at 312 mA h g−1. Compared with pure carbon fibre and TiO2 powder, the TiO2-x/C fibre membrane electrode also exhibits an excellent cycle performance with a discharge capacity of 209 mA h g−1 after 700 cycles at the current density of 300 mA g−1, and the coulombic efficiency always remains at approximately 100%.
Flexible lithium vanadium phosphate/carbon nanofiber (i.e., Li3V2(PO4)3/C) were fabricated by an electrospinning process combined with hot‐pressed sintering, and are used in lithium‐ion batteries as selfstanding, binderfree and flexible cathodes. The microstructure and crystalline phase of the as‐prepared films are characterized by scanning electron microscopy, transmission electron microscopy, and X‐ray diffractometry. The electrochemical properties of the Li3V2(PO4)3/C nanofiber films were analyzed by cyclic voltammetry and galvanostatic charge/discharge tests. When the nanofiber precursor was sintered at 850 °C for 20 h, the resulting film displays high flexibility and crystallinity. This selfstanding Li3V2(PO4)3/C film exhibits a superior rate performance even at 20 C and good cycle ability, with a retention capacity of 112 mAh g−1 at a current density of 1 C after 1000 cycles and 71 mAh g−1 at 5 C after 800 cycles. These features are attributed to the special composite structure formed by the Li3V2(PO4)3 and the carbon support, and the 3D long‐range conductive networks.
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