Ning Kang2 Li Yang1 Mei Cai1

2, Optimal CAE, Plymouth, Michigan, United States
1, General Motors, Warren, Michigan, United States

Li-S batteries has a theoretic energy density of 2510 Wh/kg and 2740 Wh/L, which is one of the most promising candidates for the next generation rechargeable batteries 1. Despite the great merits of the Li-S batteries such as high energy density and low cost, challenges, including polysulfide anions redox2 and low lithium cycling efficiency, hinder its commercialization.
There has been great research effort devoted to the optimization of sulfur electrodes, the formulations of electrolytes as well as the ratios of electrolyte to sulfur. In this talk, we will address the impact of sulfur electrode porosity on the energy density of Li-S battery and the influence of electrolyte/sulfur ratio on the Li-S battery performance.
Based on our preliminary results, at sulfur loading of 3mAh/cm2, when the porosity of sulfur electrode reduced from 70% to 50%, the energy density of Li-S battery (n/p=2) will increase from 380 Wh/kg and 400 Wh/L to 510 Wh/kg and 530 Wh/L, respectively.
Furthermore, the cycling efficiency of lithium will be discussed in this talk with different electrolyte formulations.

1) A. Manthiram, Y. Fu, S. Chung, C. Zu, Y. Su, Rechargeable Lithium–Sulfur Batteries, Chem. Rev., 2014, 114 (23), pp 11751–11787
2) SS Zhang, Improved Cyclability of Liquid Electrolyte Lithium/Sulfur Batteries by Optimizing Electrolyte/Sulfur Ratio, Energies 2012, 5, 5190-5197