R SUBADEVI
Articles written in Journal of Chemical Sciences
Volume 132 All articles Published: 12 March 2020 Article ID 0053
G RADHIKA R SUBADEVI M SIVAKUMAR
Lithium–sulfur (Li–S) batteries have established a tremendous interest in recent years because of their high specific capacity (1675 mAh g-1) and energy density (2600 Wh kg-1). In the present work, the electrode comprising carbon source viz., Acetylene Black (AB) and Manganese Oxide (MnO2) to serve as anefficient sulfur host in two different ratios (MnO2:AB as 10:20 (M1) and 20:10 (M2)) for Li/dissolved polysulfide batteries. The composite was characterized and studied by X-ray diffraction (XRD), Raman Spectroscopy, Nitrogen adsorption/desorption measurements, High-resolution transmission electron microscopy (HRTEM), X-ray photon spectroscopy (XPS), Thermogravimetric analysis (TGA) and electrochemical performance such as cyclic voltammetry (CV) and charge–discharge (C/D) tests. It shows good cycle performanceand exhibits an initial capacity of 1540 mAh/g at 0.1 C between 1.5 and 3.0 V for MnO2 rich sample. Performance enhancement was also brought about by the adsorptive properties of MnO2 which help in locking the polysulfide discharge products within the cathode structure
Volume 132, 2020
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