A PEGylated deep eutectic solvent for "bubbling" synthesis of SnO/SnS heterostructure for the stable lithium-ion storage.

Constructing heterostructures is an effective strategy for the synthesis of high-performance anode electrode materials for lithium-ion batteries (LIBs). In this study, a "bubbling" PEGylated deep eutectic solvent (DES) method is utilized to synthesize SnO/SnS heterostructure nanodots anchored on carbon nanosheets (SnO/SnS@CN). A comprehensive investigation of the physical and chemical processes during the "bubbling" reaction offers in-depth insights into the underlying mechanism of the PEGylated DES approach. The carbon nanosheet structure enhances the electrical conductivity between SnO particle units and, due to its excellent mechanical properties, significantly contributes to material stability. The nanodot configuration of the heterostructure further improves electron transfer and lithium-ion (Li) migration within the SnO units. The SnO/SnS@CN material exhibits outstanding Li storage performance, achieving a high capacity of 675.6 mA h/g at 1 A/g after 1000 cycles. These findings establish a theoretical foundation for preparing heterostructure anode materials using the "bubbling" PEGylated DES method.