Superior cyclability of branch-like TiO2 embedded on the mesoporous carbon nanofibers as free-standing anodes for lithium-ion batteries

Abstract For the poor capacity utilization and insufficient cyclability of TiO 2 /C anodes for lithium-ion batteries, we synthesized branch-like TiO 2 @mesoporous carbon nanofibers (TiO 2 @MCNFs) as free-standing anodes via electrospinning technique, hydrothermal treatment and a subsequent carbonization process, where anatase TiO 2 branches were densely embedded on the mesoporous carbon nanofiber trunks. Due to the copious highly-exposed TiO 2 nanocrystal lattices on the branch except for the trunk support, the abundant intrinsic crystal channels for fluent Li + transportation, and the interlaced carbon nanofiber framework with a high structural integrity and mechanical flexibility, the branch-like TiO 2 @MCNFs composites presented a superior initial discharge capacity of 1932 mAhg −1 and an excellent reversible capacity of ∼617 mAhg −1 after 100 cycles. And compared with those of the reported TiO 2 /C electrodes, the initial discharge capacity and reversible capacity of the branch-like TiO 2 @MCNFs composites increased by ∼2 times and ∼50%, respectively. Hence, the unique architecture of the branch-like TiO 2 @MCNFs composites and their superior electrochemical performances may provide new insights for the development of better host materials for practical lithium-ion batteries.