Constructing BaLi2Ti6O14@C nanofibers with a low carbon content as high-performance anode materials for Li-ion batteries

摘要

In this work, BaLi2Ti6O14 nanofibers coated by a thin carbon layer were rationally designed and synthesized by a controlled electrospinning process and a simple annealing process. The carbon content of the composite is as low as 1.91 wt%. This thin carbon layer is considered to contribute to remarkably improving the rate capability. Furthermore, BaLi2Ti6O14@C nanofibers can deliver a high reversible capacity of 95.0 mA h g(-1) with a capacity retention of 83.4% at a high current density of 1000 mA g(-1) after 800 cycles. Analysis of the electrochemical results showed that the existence of the carbon coating layer plays a positive role in improving the structural stability and ionic transport of BaLi2Ti6O14 during the charge/discharge processes, thereby indicating a general method for improving the electrochemical performance of electrode materials with poor electrical conductivity.