Tunable CuS nanocables with hierarchical nanosheet-assembly for ultrafast and long-cycle life sodium-ion storage

Boosting High-Rate Sodium Storage of CuS via a Hollow Spherical Nanostructure and Surface Pseudocapacitive Behavior

“…Recently, transition metal sulfides (TMSs) have been rapidly emerging as attractive stars among the numerous candidates of anode materials for alkali metal ion batteries. − This is benefited from their inherent features such as abundant raw materials, conveniently tunable nanostructures, high reversible capacity, and relatively high electrical conductivity. Furthermore, TMSs generally exhibit pseudocapacitive behavior in the process of sodiation-desodiation, which is conducive to relieve the structure destruction of electrode materials caused by sodium insertion-extraction without sacrificing the capacity. − Through nanostructure engineering, many TMSs with various unique nanostructures, take CuS as an example, such as microflowers, microspheres, nanoplates, nanocables, nanosheets, etc., have been fabricated and applied as SIB anodes, − whereas, such structure design is somewhat random and complicated. Therefore, targeted design and simple synthesis of TMSs-based anodes with customized nanostructures to fully explore the pseudocapacitive contribution is highly desirable.…”

Spatially Confined Silicon Nanoparticles Anchored in Porous Carbon as Lithium-Ion-Battery Anode Materials

“…Si@C-PAM with such a 3D porous skeleton should be beneficial for permeation of electrolytes into the entire electrode materials, enhancement of the charge-transfer rate, and shortening of the ion diffusion pathway. 40 The elemental mappings (Figure 2f,g) verify the presence and homogeneous dispersion of Si nanoparticles over the hydrogel-derived C framework. In contrast, Si@C-Gel shows the bulk morphology of Si particles adhered to C (Figure S5a,b).…”

“…The d spacing of the crystal lattice fringe, 0.311 nm, is indexed to the (111) planes of cubic Si, which is also confirmed by its XRD pattern in the following discussion. Si@C-PAM with such a 3D porous skeleton should be beneficial for permeation of electrolytes into the entire electrode materials, enhancement of the charge-transfer rate, and shortening of the ion diffusion pathway . The elemental mappings (Figure f,g) verify the presence and homogeneous dispersion of Si nanoparticles over the hydrogel-derived C framework.…”

Copper nanowire-derived one-dimensional hollow copper sulfides as electrode materials for sodium-ion batteries

“…5a), the cathodic peaks at 1.52 and 1.15 V that appeared in the first cycle correspond to the process of insertion of Na + into the Cu 2 S lattice. The two broad peaks at about 0.73 and 0.48 V are attributed to the sequential phase transitions, including the further intercalation of Na + into Na x Cu 2 S and the conversion reaction to generate Cu and Na 2 S. 16,32,33 During the anodic process, the evident peaks at 1.60, 1.81 and 2.11 V are related to the reversible conversion reaction and deintercalation of Na + from Na x Cu 2 S. 34 An extra reduction peak appears at 1.95 V in the initial scan of the CuS-3h sample, which can be attributed to the intercalation of Na + into the lattice of covellite CuS based on previous reports 35–37 (Fig. 5b).…”