Amorphous Sb(2)S(3) Nanospheres In-Situ Grown on Carbon Nanotubes: Anodes for NIBs and KIBs

Antimony sulfide (Sb(2)S(3)) with a high theoretical capacity is considered as a promising candidate for Na-ion batteries (NIBs) and K-ion batteries (KIBs). However, its poor electrochemical activity and structural stability are the main issues to be solved. Herein, amorphous Sb(2)S(3) nanospheres/carbon nanotube (Sb(2)S(3)/CNT) nanocomposites are successfully synthesized via one step self-assembly method. In-situ growth of amorphous Sb(2)S(3) nanospheres on the CNTs is confirmed by X-ray diffraction, field-emission scanning electron microscopy, and transmission electron microscopy. The amorphous Sb(2)S(3)/CNT nanocomposites as an anode for NIBs exhibit excellent electrochemical performance, delivering a high charge capacity of 870 mA h g(−1) at 100 mA g(−1), with an initial coulomb efficiency of 77.8%. Even at 3000 mA g(−1), a charge capacity of 474 mA h g(−1) can be achieved. As an anode for KIBs, the amorphous Sb(2)S(3)/CNT nanocomposites also demonstrate a high charge capacity of 451 mA h g(−1) at 25 mA g(−1). The remarkable performance of the amorphous Sb(2)S(3)/CNT nanocomposites is attributed to the synergic effects of the amorphous Sb(2)S(3) nanospheres and 3D porous conductive network constructed by the CNTs.