Orderly integration of porous TiO2(B) nanosheets into bunchy hierarchical structure for high-rate and ultralong-lifespan lithium-ion batteries
Abstract TiO 2 (B) has stimulated great interests in lithium storage owing to the highest Li-ion mobility and theoretical capacity among all TiO 2 polymorphs. However, the low conductivity and metastability of TiO 2 (B) still impede its practical application in lithium-ion batteries (LIBs). In this context, the porous TiO 2 (B) nanosheets offering rich lithium-insertion channels are rational appeals to enhancing the transport kinetics. And the firm 1D TiO 2 nanowire can serve as a crossgirder to string together these nanosheets, which improves the deformation resistance of TiO 2 (B) nanosheets during repeated lithiation/delithiation processes. Herein, the motivation was realized by constructing a bunchy hierarchical structure (TiO 2 (B)-BH) in a facile solvothermal process. As an anode material for LIBs, TiO 2 (B)-BH exhibits high reversible capacity, long-term cycling stability (186.6mAhg −1 at 1675mAg −1 after 1000 cycles) and desirable rate performance. The multiple TiO 2 (B) nanosheets stringed by 1D nanowire possess fast pseudocapacitive behaviour, effective pathway for ion/electron transfer and high structural stability, leading to the superior electrochemical performance of TiO 2 (B)-BH. This orderly integration strategy of nanosheets can be extendedly applied to the architectural construction of electrode materials for other energy devices. Highlights A integration strategy was presented to construct TiO 2 bunchy hierarchical structure. Porous TiO 2 (B) nanosheets were densely integrated onto 1D long TiO 2 nanowire. The well-designed anode exhibits remarkable rate capability and ultralong cyclelife. This strategy provids good reference to electrode materials for other energy devices. Graphical abstract A smart assembly strategy was presented to construct TiO 2 bunchy hierarchical structure (TiO 2 (B)-BH) by integrating porous TiO 2 (B) nanosheets onto one-dimensional (1D) TiO 2 nanowire crossgirder. The well-designed TiO 2 (B)-BH anode exhibits high reversible capacity, remarkable rate capability and ultralong cycle life. This integration strategy of nanosize building blocks provid good reference to the architectural construction of electrode materials for other energy devices. [DISPLAY OMISSION]
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