Engineering Metal Sulfide with Hierarchical Interfaces towards Advanced Sodium-ions Storage
Antimony sulfide as energy-storage material with remarkable theoretical capacity have captured numerous interests, whereas it was restricted by volume expansion, dissolution of polysulfide and sluggish kinetics. Utilizing oxygen-function groups of phenolic resin, engineering Sb2S3 with hierarchical interfaces (Sb, S-doped carbon) are obtained, effectively facilitating the diffusion of ions and accommodation of volume change. Importantly, double-controlling synergistic effects of Sb shell and S-doped carbon would prolong the diffusion pathway of polysulfide, strongly bringing about advanced sodium-ions storage capability. As a result, it delivers a capacity retention rate of 97.1% at 0.1 A g-1 after 200 cycles. At 0.5, 1.0, 2.0 A g-1 after 150 cycles, it still maintains capacity of 422.6, 367, 311.1 mAh g-1, respectively. The detailed exploration of capacity confirm that the introduced hierarchical interfaces significantly promoted the faster transfer of electrons and the trapping of poly-sulfide accompanied with improved reversible conversion reaction. The quantitative analyses of capacitive contribution and EIS reveal that core-shell structure and S-doped carbon would fundamentally enhance the pseudocapacitive behaviors and boosted the transferring of electrons/ions. This rational design is expected to brighten the prospects for designing metal-sulfides as advanced anodes of sodium-ion batteries.