Facile Synthesis of Carbon Nanospheres with High Capability to Inhale Selenium Powder for Electrochemical Energy Storage.

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.