Investigation on Ti2Nb10O29 anode material for lithium-ion batteries

Electrochemical lithium insertion property of Ti2Nb10O29 anode with ReO3 structure was investigated in the voltage range of 1.0-2.5 V. This host can be inserted up to 15 Li per formula unit (corresponding to 270 mAh/g) on the first discharge and 13.8 Li can be extracted reversibly. In-situ X-ray diffraction measurements suggest that during discharge process, the structure evolution of Ti2Nb10O29 experiences a solid-solution reaction followed by phase-separation and again solid-solution process. The Ti2Nb10O29 anode exhibits a good rate performance. At discharge rates of 2C and 10C, the reversible capacities of 210 and 133 mAh/g can be obtained. (C) 2012 Elsevier B.V. All rights reserved.