LAUSR

Inhibiting the shuttle effect caused by soluble lithium polysulfides (LiPSs) is of importance for lithium-sulfur (Li-S) batteries. Here, we report a strategy to construct protective layers by self-assembly networks to regulate the LiPSs. 2,5-dichloropyridine (25DCP) holds two kinds of functional groups. Among them the two C-Cl bonds are nucleophilic substituted by S in LiPSs to form long chains. And the pyridine N interacts with Li in other LiPSs via Li bonds to form a short chain. As a result, the long chains are cross-linked by the short chain to form an insoluble network. The as-prepared network covers the sulfur electrode interface to suppress the shuttle effect of the subsequently generated LiPSs. Furthermore, 25DCP improves the redox dynamics by changing the energy level and electronic structure of the sulfur species. Therefore, the Li-S batteries with 25DCP exhibit good electrochemical performance. This work provides a feasible strategy for regulating the LiPSs.