Abstract
Carbon–selenium composite positive electrode (CSs@Se) is engineered in this project using a melt diffusion approach with glucose as a precursor, and it demonstrates good electrochemical performance for lithium–selenium batteries. X-ray diffraction (XRD) and scanning electron microscopy (SEM) with EDS analysis are used to characterize the newly designed CSs@Se electrode. To complete the evaluation, electrochemical characterization such as charge–discharge (rate performance and cycle stability), cyclic voltammetry (CV), and electrochemical impedance spectroscopy (EIS) tests are done. The findings show that selenium particles are distributed uniformly in mono-sized carbon spheres with enormous surface areas. Furthermore, the charge–discharge test demonstrates that the CSs@Se cathode has a rate performance of 104 mA h g−1 even at current density of 2500 mA g−1 and can sustain stable cycling for 70 cycles with a specific capacity of 270 mA h g−1 at current density of 25 mA g−1. The homogeneous diffusion of selenium particles in the produced spheres is credited with an improved electrochemical performance.
Highlights
The favorable profiles are due to the incorporation of selenium powder into the Carbon spheres (CSs), which results in the reduced development of the intermediary polyselenides, which normally dissolve in the electrolytes and cause capacity fading
Low and high magnification scanning electron microscopy (SEM) pictures of bare carbon spheres are shown in FigLow and high magnification SEM pictures of bare carbon spheres are shown in ure 1a,b
The elemental mapping of the CSs@Se composite is shown in Figure 1d–f, indicating that carbon and selenium oxides are generated during the in Figure 1d–f, indicating that carbon and selenium oxides are generated during the synthesis process, though in modest amounts
Summary
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. Selenium has a higher electrical conductivity (1 × 10−3 S m−1 ) than sulfur (5 × 10−28 S m−1 ) [9,10] resulting in good rate and cyclic performance without the requirement for a large amount of conductive carbon. Due to these properties, selenium is a good contender for high energy positive electrode material [11]. The favorable profiles are due to the incorporation of selenium powder into the CSs, which results in the reduced development of the intermediary polyselenides, which normally dissolve in the electrolytes and cause capacity fading
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