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 Ti₃C₂T_x MXene flakes. The highly conductive Ti₃C₂Tx 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. [ABSTRACT FROM AUTHOR]