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Composites; metal oxide; lithium–sulfur; acetylene black; energy storage

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

G RADHIKA R SUBADEVI M SIVAKUMAR¹

1. #120, Energy Materials Lab, Department of Physics, Science Block, Alagappa University, Karaikudi, Tamil Nadu 630 003, India

Published

12 March 2020

Manuscript received

1 September 2019

Manuscript revised

1 December 2019

Accepted

2 December 2019