High performance Cr, N-codoped mesoporous TiO2 microspheres for lithium-ion batteries

Abstract

Cr, N-codoped TiO₂ mesoporous microspheres have been successfully synthesized by a facile hydrothermal reaction followed by annealing under an ammonia atmosphere. Through introduction of Cr, the nitrogen doping level was increased from 2.81 at.% for N-doped TiO₂ to 5.68 at.% for Cr, N-codoped TiO₂, which improves the electrical conductivity of TiO₂. When used as an anode for lithium-ion rechargeable batteries, the Cr, N-codoping TiO₂ microspheres led to an enhanced performance of 159.6 mA h g⁻¹ at 5 C with a drop of less than 1% after 300 cycles.