Hierarchically Micro-/Nanostructured TiO2/Micron Carbon Fibers Composites for Long-Life and Fast-Charging Lithium-Ion Batteries

Long-life lithium-ion batteries require materials with well-designed and controlled structures on nanometer and micrometer scales. Therefore, the hierarchically structured TiO2/micron carbon fibers composites (TiO2/MCFs) composed of well-defined nanowires are fabricated through a straightforward impregnation-calcination process. The unique features, including hierarchically mesoporous micro-/nanostructures, large specific surface area, and high electrical conductivity endow the TiO2/MCFs with convenient lithium-ion and electron diffusion channels and effective stress-strain relief during repeated electrochemical reaction process. As anticipated, TiO2/MCFs deliver an excellent cycling stability with 92% capacity retention after 5000 cycles at high current density of 2000 mAg(-1), highlighting the great potential for long-life and fast-charging lithium-ion batteries.