Heterojunction engineering and ether-based electrolyte boost In2S3/MoS2 for high-efficient sodium storage

In 2 S 3 /MoS 2 @NC was constructed via a chemical foaming and sulfuration strategy. • The In 2 S 3 /MoS 2 heterostructure effectively accelerates the charge transfer. • The glyme-based electrolyte used boosts a thin and stable SEI layer. • In 2 S 3 /MoS 2 @NC shows excellent Na storage properties at room/low temperatures. To position transition metal sulfides to function effectively as anodes in sodium-ion batteries (SIBs), it is essential to address their poor sodium storage performance, which stems from low conductivity and substantial volume fluctuations. Inspired by the heterojunction engineering, herein, a composite of In 2 S 3 /MoS 2 heterostructure in three-dimensional N-doped carbon frameworks (In 2 S 3 /MoS 2 @NC) was constructed via an efficient chemical foaming and subsequent sulfuration strategy. The In 2 S 3 /MoS 2 heterostructure could effectively accelerate the charge transfer, augment the pseudocapacitive contribution and enhance Na + adsorption ability. The system employs a glyme-based electrolyte, which helps generate a thin, stable solid-electrolyte interface. Synchronously, the N-doped carbon frameworks serve to buffer the volume variation of In 2 S 3 /MoS 2 by functioning as a shielding layer. As anticipated, the In 2 S 3 /MoS 2 @NC electrode displays superior high-rate performance (243.2 mAh g −1 at 10 A g −1 ) and long-term cycling stability (352.3 mAh g −1 at 1 A g −1 after 1000 cycles, 223.1 mAh g −1 at 5 A g −1 and 170.5 mAh g −1 at 10 A g −1 after 2000 cycles). Particularly, it also shows potential in cryogenic applications (266.5 mAh g −1 after 70 cycles at 0.5 A g −1 , as well as 185.9 mAh g −1 at 2 A g −1 ). By proposing a straightforward strategy to rationally design anodes for SIBs, this work further advances the understanding of heterojunction engineering and ether-based electrolytes for transition metal sulfides. A hybrid of In 2 S 3 /MoS 2 @NC was constructed via a chemical foaming and subsequent sulfuration strategy. In the hybrid, the In 2 S 3 /MoS 2 heterostructure effectively accelerates the charge transfer and enhance Na + adsorption ability. The glyme-based electrolyte boosts a thin, stable solid-electrolyte interface. In 2 S 3 /MoS 2 @NC as an anode material in SIBs, delivers excellent sodium storage performance at room and low temperatures. Download: Download high-res image (242KB) Download: Download full-size image