Heterostructured Mn3O4-MnS Multi-Shelled Hollow Spheres for Enhanced Polysulfide Regulation in Lithium-Sulfur Batteries

作者：Qin, Bin; Wang, Qun; Yao, Weiqi; Cai, Yifei; Chen, Yuhan; Wang, Pengcheng; Zou, Yongchun; Zheng, Xiaohang^*; Cao, Jian; Qi, Junlei; Cai, Wei

来源：Energy & Environmental Materials, 2023, 6(6).

DOI：10.1002/eem2.12475

• electrocatalyst
• heterojunction host
• hollow multi-shelled structure
• Li-S battery
• Mn3O4-MnS

Constructing heterojunctions and hollow multi-shelled structures can render materials with fascinating physicochemical properties, and have been regarded as two promising strategies to overcome the severe shuttling and sluggish kinetics of polysulfide in lithium-sulfur (Li-S) batteries. However, a single strategy can only take limited effect. Modulating catalytic hosts with synergistic effects are urgently desired. Herein, Mn3O4-MnS heterogeneous multi-shelled hollow spheres are meticulously designed by controlled sulfuration of Mn2O3 hollow spheres, and then applied as advanced encapsulation hosts for Li-S batteries. Benefiting from the separated spatial confinement by hollow multi-shelled structure, ample exposed active sites and built-in electric field by heterogeneous interface, and synergistic effects between Mn3O4 (strong adsorption) and MnS (fast conversion) components, the assembled battery achieves prominent rate capability and decent cyclability (0.016% decay per cycle at 2 C, 1000 cycles). More crucially, satisfactory areal capacity reaches up to 7.1 mAh cm(-2) even with high sulfur loading (8.0 mg cm(-2)) and lean electrolyte (E/S = 4.0 mu L mg(-1)) conditions. This work will provide inspiration for the rational design of hollow multi-shelled heterostructure for various electrocatalysis applications.

• 单位
  华东理工大学