Abundant Defects-induced Interfaces Enabling Effective Anchoring for Polysulfides and Enhanced Kinetics in Lean Electrolyte Lithium-Sulfur Batteries

In response to the concept of “compact energy storage”, researches on electrolyte dosage dwindling is definitely efficient owing to present electrolyte usage up to 70 wt% in a cell. While less electrolyte usage leads to slow reaction kinetics. Herein, a heterojunction, MoP/MoS2 core with much defects and vacancies coated by porous carbon shell, is synthesized. Besides, the small particle size of MoP/MoS2@C facilitates a close packing to form a dense and porous modified layer on PP-based (F-PP) separator. The heterojunction with defects exposes abundant interfaces, assures an adequate local electrolyte availability and an improved electrolyte affinity that are beneficial for Li+ transfer. When using F-PP separator, Li-S cell performs well in the lean electrolyte. Apart from a high discharging capacity of 517.1 mAh g-1 at 5 C in E/S=10 (only half benchmark dosage) , the cell realizes a favorable stability at C/2 over 500 cycles even in E/S=7 (0.065% decay per cycle), demonstrating an effective polysulfide (...