▎ 摘　　要

In this paper, Ni2P nanoparticles is incorporated onto the graphene & carbon nanotubes composite (Ni2P NPs/rGO & CNTs) to form flexible free-standing intertwining network film anodes for improving the cycle-life of sodium-ion batteries (SIBs). Benefited from the volume accommodation by this Ni2P NPs/rGO & CNTs structure and its excellent electronic conductive network along with high mechanical strength, such an anode-based SIB shows a superior capacity retention with a stable and long cycle-life at high current densities. For Ni2P NPs/rGO & CNTs electrode, it remains a capacity of 224 mAh g(-1)after 100 cycles, at a high current density of 0.5 A g(-1), the Ni2P NPs/rGO & CNTs can still maintain a stable reversible capacity of similar to 150 mAh g(-1)after 500 cycles, after cycling at a rate as high as 1 A g(-1), the reversible capacity of the Ni2P NPs/rGO/CNT can still sustain stable capacities at 91 mAh g(-1)after 2000 cycles, respectively. Even at 5 A g(-1), it still exhibits a high rate capacity of 65 mAh g(-1), thus exhibiting an excellent sodium storage kinetics.