Facile Synthesis of Binder-Free Three-Dimensional CuxS Nanoflowers for Lithium Batteries

Abstract

Copper sulfides (Cu x S) with different stoichiometry are considered as prospective cathode materials for lithium batteries owing to their large energy storage capability. In this work, three-dimensional Cu x S 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 Cu x S 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. 8 S cathode with 100% Coulombic efficiency and capacity of approximately 250 mAh g −1 .

Morphology and Dimension Variations of Copper Sulfide for High-Performance Electrode in Rechargeable Batteries: A Review

“…Recently the facile approach of soaking Cu foam in a DMSO/S solution was used to prepare Cu 1.8 S and Cu 1.96 S electrodes for LIBs. The cell demonstrated the stable capacity of about 250 mAh g −1 in the case of Cu 1.8 S. 131 ■ FULL-CELLS WITH Cu x S ELECTRODES Although above we discussed the effect of dimensionality on the electrochemical performance of Cu x S electrodes in halfcells mainly, the full capability of application of such batteries should be tested further in the full-cell configurations. So far, only a few works can be found demonstrating the practical application of Cu x S electrodes in full-cells.…”

“…Recently the facile approach of soaking Cu foam in a DMSO/S solution was used to prepare Cu 1.8 S and Cu 1.96 S electrodes for LIBs. The cell demonstrated the stable capacity of about 250 mAh g –1 in the case of Cu 1.8 S …”

Advanced Battery Materials Research at Nazarbayev University: Review

“…Electrochemical testing of Cu x S/Cu foam elec- trodes (x=1, 1.8) showed a reasonable capacities of 450 mAh g -1 and 250 mAh g -1 at 0.1 C and excellent cyclability, which might be attributed to the unique 3D structure of the current collector and hierarchical nanocrystalline branches and nanoflowers that provide fast diffusion and a large surface area (Fig. 9) [34,35].…”

Molecular precursor-mediated facile synthesis of phase pure metal-rich digenite (Cu1.8S) nanocrystals: an efficient anode for lithium-ion batteries

“…16 However, its use as an anode material for LIBs still remains largely underexplored. 17 To access the technologically important copper sulfide, several synthetic strategies have been adopted. These include the ubiquitous hot injection method, [18][19][20] solvothermal synthesis, [21][22][23] precipitation, 24 and cation exchange.…”