Understanding Sulfur Redox Mechanisms in Different Electrolytes for Room-Temperature Na-S Batteries.

ABSTRACT: This work reports influence of two different electrolytes, carbonate ester and ether electrolytes, on the sulfur redox reactions in room-temperature Na-S batteries. Two sulfur cathodes with different S loading ratio and status are investigated. A sulfur-rich composite with most sulfur dispersed on the surface of a carbon host can realize a high loading ratio (72% S). In contrast, a confined sulfur sample can encapsulate S into the pores of the carbon host with a low loading ratio (44% S). In carbonate ester electrolyte, only the sulfur trapped in porous structures is active via 'solid-solid' behavior during cycling. The S cathode with high surface sulfur shows poor reversible capacity because of the severe side reactions between the surface polysulfides and the carbonate ester solvents. To

SUBMITTER: Liu H 

PROVIDER: S-EPMC8096878 | biostudies-literature | 2021 May

REPOSITORIES: biostudies-literature