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.

► Introduce a novel anode material of Ti2Nb10O29 for lithium-ion batteries.
► 15 Li can be inserted and 13.8 Li can be extracted into/from 1 mol Ti2Nb10O29.
► In-situ XRD reveals Ti2Nb10O29 experiences two-phase and single-phase mechanism.
► At discharge rates of 10C, the reversible capacities of 133 mAh/g can be achieved.