Abstract
AbstractNano‐TiNb2O7/multiwalled carbon nanotube and ketjen black (TiNb2O7/CNT‐KB) composite microspheres with porous three‐dimensional (3D) hierarchical heterostructure are fabricated by spray drying and solvothermal method. This composite material exhibits a high reversible charge specific capacity of 327.8 mAh g−1 at the current rate of 0.1 C and 151.1 mAh g−1 at 20 C rate. When it is cycled at a high current rate of 5 C for 1000 cycles, the charge capacity is dropped from the maximum value of 220.8 mAh g−1 (6th cycle) to the end value of 145.4 mAh g−1, with capacity retention of 65.9 %. The TiNb2O7/CNT‐KB composite material demonstrates much superior electrochemical performance over the bare TiNb2O7 material, and this result should be attributed to its particular porous 3D hierarchical structure, which possesses enhanced electrical conductivity as well as the ability for accommodating volume change and preventing particle aggregation of the electrode active material during the discharge and charge cycles.
Published Version
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