TiO2-B fibers were obtained by heat treatment of the precursor of tetratitanate (H2Ti4O9· xH2O)
which was derived from potassium tetratitanate (K2Ti4O9) via ion exchange.Structure characterization showed that TiO2-B fibers sintered at 600℃ still maintained pure phase and high crystallinity.Lithium insertion performance indicated that the capacity performance of this TiO2-B material sintered at 600℃ was up to 225 mA·h·g-1
and was 50 mA·h·g-1 (i.e.22.5%) higher than that of the anatase material with similar structure.The TiO2-B fibers exhibited excellent rate performance mainly because the open structure of the TiO2-B fibers led to fast lithium-ion diffusion coefficient of 1.92×10-7 cm2·s-1
which was nearly 8 times higher than that of anatase material.1 C stability test showed that the capacity of TiO2-B fiber was 159 mA·h·g-1 after 80 cycles
which was about 1.5 times higher than the capacity of anatase material (64 mA·h·g-1).