Ultralong SrLi2Ti6O14 nanowires composed of single-crystalline nanoparticles: Promising candidates for high-power lithium ions batteries

Abstract

To deploy Li-ion batteries for large scale application, it is essential to develop durable electrodes with high power and energy density. Here, we demonstrate that ultralong SrLi2Ti6O14 nanowires anode materials synthesized by a simple electrospinning technique are capable of excellent high-rate performance with long stability. The SrLi2Ti6O14 nanowires composed of single-crystalline nanoparticles possess the features of “nano-bead-chain” architecture. Used as anode material for lithium ions batteries, the novel SrLi2Ti6O14 nanowires exhibits a high reversible capacity of 171.4mAhg−1 at 0.1C and retains 96.2mAhg−1 even at high rate of 20C. In addition, the capacity is able to stabilize at 101mAhg−1 after 1000 cycles, corresponding to 0.0086% capacity fading per cycle. Importantly, the Li-storage mechanism of Li2SrTi6O14 was revealed by X-ray photoelectron spectroscopy (XPS) and X-ray absorption near edge structure (XANES). The greatly improved electrochemical performance arises from the favorable kinetics properties stemming from unique nanoparticle-in-nanowire one-dimensional architecture.