Lithium-Sulfur Batteries with Glyme-Li Salt Equimolar Complexes

Lithium-sulfur (Li-S) battery consists of sulfur cathode, Li metal anode, and a Li+-ion conductive electrolyte. Sulfur has the high theoretical capacity of 1672 mA h g-1, which is 10 times higher than that of conventional cathode materials (such as LiCoO2 and LiFePO4) for lithium ion batteries, therefore, much higher energy density can be achieved using sulfur cathode. However, Li-S batteries with conventional liquid electrolytes suffer from rapid capacity fade due to the dissolution of lithium polysulfides into the electrolytes. Recently, we reported that the dissolution of lithium polysulides can be suppressed using glyme-Li salt complex electrolytes, leading to a high Coulombic efficiency of charge-discharge and long cycle life of Li-S batteries. The glyme molecule having the chemica