High-Performance Black Phosphorus/Cnts/Mxene Ternary Composite as an Anode Material for Lithium-Ion Batteries

Black phosphorus (BP) is a promising anode material to improve the power and energy densities of Li-ion batteries because it provides a large theoretical specific capacity (2596 mAh g -1 ), good electronic conductivity, and ultrafast Li + diffusion channels. However, the practical application of BP anode is hampered by poor cycling performance arising from its large volume change and the dissolution of lithium polyphosphides intermediates during lithiation and delithiation processes. Herein, a novel BP/carbon nanotubes/MXene ternary composite was prepared by a simple ball milling method. The rich surface functional groups of Ti 3 C 2 T x MXene can adsorb the soluble lithium polyphosphides intermediates and suppress side reactions, increasing the reversible specific capacity. One-dimensional carbon nanotubes (CNTs) can prevent the stacking of BP and MXene, which contribute to enhancing structural stability and improving the rate performance. Thus, the BP/CNTs/MXene ternary composite shows a high specific capacity, good cycling stability, and rate performance. At a current density of 0.1 A g -1 , BP/CNTs/MXene composite delivers an initial reversible capacity of 1074 mAh g -1 and initial coulombic efficiency of 82.5%. Moreover, the BP/CNTs/MXene composite also delivers excellent rate performance and cycling performance, demonstrating about 490 mAh g -1 reversible capacity after 100 cycles at a current density of 3 A g -1 .