Li₄Ti₅O₁₂@N-Doped Carbon Composites as Anode Materials for Lithium Ion Batteries

摘要

Li4Ti5O12 is considered a promising anode material for lithium ion batteries because of its zero-straininsertion. However, this material is difficult for widespread application due to its shortage of electronicand ionic conductivity. Herein, we reported a facile hydrothermal combined calcination method tosynthesize Li4Ti5O12@nitrogen-doped carbon (LTO@NC) composites by using urea as the nitrogenand carbon sources. The results of electrochemical experiments showed that the LTO@NC compositesexhibited a high initial capacity of 194.3 mA h g-1, an increased specific capacity and an improved rateperformance. This could be ascribed to the N-doped carbon coating that enhanced the electronicconductivity and decreased the polarization of the material and the reduced particle size thathydrothermally shortened the diffusion path of Li+.