(Digital Presentation) The Effects of Charging Rates on the Thermal Behavior of Lithium-Sulfur Batteries Via Comsol Simulation

Li-S battery, with Li metal as anode and sulfur as cathode, exhibits a theoretical capacity of 1667 mAh/g and outperforms Lithium-ion batteries (LIBs) in energy density, and promises great utilization in battery-based aircraft. Given its important role in the SEI interphase and safety concerns, the temperature distribution within cells is of great interest to the community these days. In this study, with thermal effects during charging/discharging process considered, a 3D homogeneous electrochemical model was introduced. What’s more, the effects of increasing charging rates from 1 C charging to 6 C charging of typical Li-S single layer pouch cells were probed via COMSOL simulation. It is found that the higher the charging rates, the higher the temperature within Li-S pouch cells. Meanwhile, for a given charging rate, the middle part of the electrodes exhibits the highest temperature increase due to its worst heat transfer in the core regions. All simulation results agree well with published experimental result, this 3D model can be further utilized by designers to assess temperature distribution within Li-S batteries and exaccerlate design for battery packages.