Supplementary material from "Electrospinning preparation of oxygen-deficient nano TiO_2-x/carbon fibre membrane as a self-standing high performance anode for Li-ion battery"

Improving the specific capacity and electronic conductivity of TiO₂ can boost its practical application as a promising anode material for lithium ion battery. In this work, a three-dimensional networking oxygen-deficient nano TiO_2-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 TiO_2-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 mAh g⁻¹. Even at 500 mA g⁻¹, the discharge capacity still remains 312mAh/g. Compared with pure carbon fibre and TiO₂ powder, the TiO_2-x/C fibre membrane electrode also exhibits an excellent cycle performance with a discharge capacity of 209 mAh g⁻¹ after 700 cycles at the current density of 300 mA g⁻¹, and the coulombic efficiency always maintains at approximately 100%.