PNNL

Abstract

Lithium-sulfur (Li-S) batteries offer high energy density at low cost, yet their lifetime is compromised by the dissolution of lithium polysulfides that causes capacity degradation when cycled under practical conditions. Covalently bonding sulfur molecules onto organic polymers can mitigate the formation of soluble polysulfides with marginally improved cycling stability, but this typically yields sulfur cathodes with limited capacities (