Soluble inorganic quantum dots as an electrolyte additive to boost lithium-sulfur battery performance.

Herein, MoS 2 quantum dots (QDs) are constructed to serve as electrolyte additives for lithium-sulfur batteries, which can 'solidify' soluble polysulfides by chemisorption and promote sulfur conversion chemistry by electrocatalysis. The Li-S cell with MoS 2 QDs shows high retained capacity and high-rate capability, much better than the counterpart without MoS 2 QDs.