Copper sulfides (CuxS) with different stoichiometry are considered as prospective
cathode materials for lithium batteries owing to their large energy storage capability.
In this work, three-dimensional CuxS cathodes were synthesized via introducing commercially
available copper foam into the solution of dimethyl sulfoxide (DMSO) and sulfur powder.
The synthesis procedures were straightforward and ultrafast and did not require additional
reagents, high temperature, or long processing time and can be considered as a facile
one-step method. Copper sulfide materials with different stoichiometry (x= 1.8, 1.96)
were obtained by changing the temperature and the residence time of the copper foam
in the DMSO solution. The effects of the temperature and time on phase and morphology
of CuxS were characterized by X-ray diffraction and scanning electron microscopy coupled
with energy dispersive X-ray spectroscopy. Electrochemical tests resulted in a stable
cyclability of Cu-1.S-8 cathode with 100% Coulombic efficiency and capacity of approximately
250 mAh g(-1).