Abstract
Sulfur is a promising cathode material for lithium sulfur batteries due to its high theoretical capacity (1675 mAh/g). Sulfur cathodes mostly suffer from rapid falls of capacity resulting in poor Coulombic efficiency starting from the dissolution of intermediate polysulfides in the electrolyte during discharge cycles. To enhance the electrochemical performance, carbon nanotube as conductive material has been added in sulfur. Ferroelectric materials on the other hand, have unique property of possessing permanent internal microscopic field in the ferroelectric phases. Coupling with highly polarized ferroelectric material, such as doped BiFeO3 (Bi0.9Gd0.1Fe0.95Ni0.05O3), is a process that can be used to enhance higher rate characteristics and trapping of shuttle mechanism because ferroelectrics provide internal electric field that induces macroscopic charge separation on the surface of the cathode.We report a study on nanostructured composite of Sulfur and doped BiFeO3 in wt % of the formula SX(BGFNO)1-X (where x=0.1, 0.2, 0.3 and 0.4) and adding 10% CNT in the composites as a cathode material fabricated by ball-milling technique for lithium sulfur batteries. The characterization of the sulfur composites were carried out by techniques, namely X-ray diffraction (XRD), scanning electron microscopy (SEM), RAMAN spectroscopy and the electrochemical studies and the results will be presented.
Published Version
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