TiO2(B)@carbon composite nanowires as anode for lithium ion batteries with enhanced reversible capacity and cyclic performance

Abstract

Novel TiO 2 (B)@carbon composite nanowires were simply prepared by a two-step hydrothermal process with subsequent heat treatment in argon. The nanostructures exhibit the unique feature of having TiO 2 (B) encapsulated inside and an amorphous carbon layer coating the outside. The unique core/shell structure and chemical composition is likely to lead to perfect performance in many applications. In this paper, the results of Li-ion battery testing are presented to demonstrate the superior cyclic performance and rate capability of the TiO 2 (B)@carbon nanowires. The composite nanowires exhibit a high reversible capacity of 560 mAh g À1 after 100 cycles at the current density of 30 mA g À1, and excellent cycling stability and rate capability (200 mAh g À1 when cycled at the current density of 750 mA g À1), indicating that the composite is a promising anode candidate for Li-ion batteries.

Electrospun Conformal Li4Ti5O12/C Fibers for High‐Rate Lithium‐Ion Batteries

“…This can be attributed to the presence of the carbon layer that was formed in situ, which prohibits the growth of the LTO grains. [11] Figure 2 a shows the representative scanning electron microscopy (SEM) images for the electrospun precursor fibers. Long and continuous fibers with smooth surfaces and an average diameter of approximately 500 nm are observed.…”

Compositing Amorphous TiO2 with N‐Doped Carbon as High‐Rate Anode Materials for Lithium‐Ion Batteries

“…Figure 6 a shows the charge-discharge voltage profiles cycled at a current rate of 1 C (1 C = 305.4 mA g À1 , which is calculated based on the capacity of the C and TiO 2 ) over the potential window of 0.01-3.00 V versus Li + /Li. Usually the commonly used potential window is 0.01-3.00 V for carbon materials and 1.00-3.00 V for TiO 2 ; therefore, to more effectively achieve the synergistic effect between carbon and TiO 2 in this hybrid, we used a voltage window of 0.01-3.00 V. [25] The initial discharge and charge specific capacities are 871.8 and 483.3 mA h g À1 , respectively, in which the large initial discharge capacity can be attributed to the formation of solid electrolyte interface (SEI) films on the surface of the electrode owing to electrolyte decomposition and some side reactions; this is similar to most reports on LIBs. [1][2][3]26] Although a large irreversible capacity loss is observed in the first cycle, the reversible capacity is still as high as 541.1 mA h g À1 in the second cycle and in subsequent cycles it exhibits very slight fading.…”

Anodes for Li-Ion Batteries

“…They exhibited a large discharge capacity of 258 mAh g À1 at the fifth cycle and maintained a large discharge capacity of 253 mAh g À1 after ten cycles. TiO 2 -B nanowires encapsulated inside and an amorphous carbon layer coating the outside were obtained by hydrothermal process [349]. These carbon-TiO 2 -B nanowires exhibited a high reversible capacity of 560 mAh g À1 after 100 cycles at the current density of 30 mA g À1 , good cycling stability, and rate capability (200 mAh g À1 when cycled at the current density of 750 mA g À1 ).…”