Wyniki wyszukiwania - BazTech

Ograniczanie wyników

2 Materials Science Poland

Znaleziono wyników: 2

Liczba wyników na stronie

Wyniki wyszukiwania

Sortuj według:

Ogranicz wyniki do:

Structural characteristic of vanadium(V) oxide/sulfur composite cathode for magnesium battery applications

Sheha E., Kamar E. M.

Materials Science Poland

2019

Vol. 37, No. 4

570--576

Magnesium batteries are regarded as promising candidates for energy storage devices owing to their high volumetric capacity. The practical application is hindered, however, by strong electrostatic interactions between Mg2+ and the host lattice and due to the formation of a passivation layer between anode and electrolyte. V2O5is a typical intercalation compound with a layered crystal structure ((0 0 1) interlayer spacing ~ 11.53 Å), which can act as a good host for the reversible insertion and extraction of multivalent cations. Herein, we have presented an investigation of the effects of S injection on the structure, electrochemical performance and Mg2+ diffusion in V2O5 cathode materials for Mg-ion batteries. The V2O5/S composite structure was investigated using X-ray diffraction, field-emission scanning electron microscope and energy dispersive X-ray spectroscopy. The integrated electrode exhibits an improvement in the electrical and electrochemical properties compared to the V2O5 electrode. The as-prepared V2O5/S composite has an initial discharge capacity of 310 mAh∙g−1 compared to 160 mAh∙g−1 for the V2O5 electrode. The V2O5 /S composite is a promising cathode material for magnesium-ion battery applications.

Green synthesis of Co3O4/graphene nanocomposite as cathode for magnesium batteries

Kamar E. M., Sheha E.

Materials Science Poland

2017

Vol. 35, No. 3

528--533

Ultrafine Co3O4 nanoparticles homogeneously attached to graphene sheets by sonochemical method have been demonstrated as a promising cathode material for magnesium batteries. X-ray diffraction (XRD), scanning electron microscopy (SEM), and energy dispersive spectroscopy (EDS) have been employed to characterize the structural properties of this material. SEM analyses clearly confirmed that the Co3O4 nanoparticles have been uniformly coated on the entire surface of graphene sheets to form a compact composite. The Co3O4-graphene nanocomposite was employed as a cathode electrode in magnesium-ion batteries, and their electrochemical properties were briefly investigated. The graphene sheets can also effectively buffer the volume change in Co3O4 upon magnesium insertion/extraction, thus improving the cycling preformance of the composite electrode. It was revealed that the Co3O4-graphene composite can provide a small capacity of 16 mAh·g-1 using a new nonaqueous electrolyte that is tetrahydrofuran-free, which provides a new direction to explore cathode materials for Mg batteries.