Application of nitrogen-doped SnO₂/MXene/CNTs composite with long cycle stability in lithium-ion batteries

MXene is a novel two-dimensional (2D) material with high electronic conductivity and hydrophilicity. MXene's progress is hampered because of its poor theoretical capacity. Based on this, a simple hydrothermal method is used to evenly distribute SnO2 on two-dimensional Ti3C2Tx MXene flakes. The highly conductive Ti(3)C(2)Tx MXene provides an excellent channel for the fast transit of electrons and Li ions and buffers the volume changes of SnO2 during lithiation/delithiation by constraining SnO2 between MXene nanosheets. CNTs enable their structural integrity to be ensured. As a result, the nitrogen-doped SnO2/MXene/CNTs hybrid material exhibits outstanding lithium storage performance, including high capacity, stable cyclic performance (927.26 mAh g(-1) at 100 mA g(-1), with 99.82% capacity retention after 100 cycles), and great rate performance (462.3 mAh g(-1) at 1 Ag-1), making it as a promising negative electrode material for lithium-ion batteries.