Simulation of the Structural Design of Lithium-Sulfur Batteries

Lithium-sulfur (Li-S) batteries are used in niche applications with high demands for specific energy densities, which may be as high as ۵۰۰–۶۰۰ Wh/kg. A simulation is a computer program that helps in creating a real-time abstract model of a process. COMSOL, the finite element software, was used to solve the governing equations. The electrical conductivity of electrolyte and thickness of separator and cathode are among the most critical parameters of battery stability and voltage of the cell. The current study investigates the one-dimensional simulation of Li-S battery designed by graphene composite (COS) cathode, polyimide-based nano-fiber carbon anode, and optimized separator and electrolyte. This model, highly-safe lithium-sulfur batteries, is based on flame-retardant electrolyte (dimethoxyether/۱,۱,۲,۲-tetrafluoroethyl ۲,۲,۳,۳ tetrafluoropropyl ether) coupled with functional separator (MoO۳ nanobelts (MNBs) coated polypropylene (PP)) to resolve unfavorable stability of polysulfide. The results show the optimum thicknesses of cathode and separator for carbon/sulfur cathode–based lithium-sulfur batteries using this flame retardant electrolyte coupled with polypropylene (PP) coated by MoO۳ nanobelts separator are ۱۵۰, ۱۰ microns, respectively. Moreover, this could happen at the ۰.۲ charge/discharge rate and ۲.۱volts cell voltage.

Keywords:

Lithium-sulfur batteries , COMSOL , High energy density , Simulation