One-Pot Synthesis of Copper Sulfide Nanowires/Reduced\nGraphene Oxide Nanocomposites with Excellent Lithium-Storage Properties\nas Anode Materials for Lithium-Ion Batteries

Abstract

Copper\nsulfide nanowires/reduced graphene oxide (CuSNWs/rGO) nanocompsites\nare successfully synthesized via a facile one-pot and template-free\nsolution method in a dimethyl sulfoxide (DMSO)–ethyl glycol\n(EG) mixed solvent. It is noteworthy that the precursor plays a crucial\nrole in the formation of the nanocomposites structure. SEM, TEM, XRD,\nIR and Raman spectroscopy are used to investigate the morphological\nand structural evolution of CuSNWs/rGO nanocomposites. The as-fabricated\nCuSNWs/rGO nanocompsites show remarkably improved Li-storage performance,\nexcellent cycling stability as well as high-rate capability compared\nwith pristine CuS nanowires. It obtains a reversible capacity of 620\nmAh g^–1 at 0.5C (1C = 560 mA g^–1) after 100 cycles and 320 mAh g^–1 at a high current\nrate of 4C even after 430 cycles. The excellent lithium storage performance\nis ascribed to the synergistic effect between CuS nanowires and rGO\nnanosheets. The as-formed CuSNWs/rGO nanocomposites can effectively\naccommodate large volume changes, supply a 2D conducting network and\ntrap the polysulfides generated during the conversion reaction of\nCuS.