Linearly Bonded Organoselenide‐Sulfide Hybrid Compound Cathode Materials for High‐Capacity and Shuttling‐Suppressed Lithium‐Organochalcogenide Batteries

ABSTRACT

Lithium‐organochalcogenide batteries have the merits of high energy density, eco‐friendliness, and low costs, but facing issues like rapid capacity fading and poor rate capability. Herein, we propose the design and synthesis of an organoselenide‐sulfide hybrid compound by reacting tetramethyl thiuram disulfide with molten selenium disulfide (SeS ₂ ). The organoselenide‐sulfide hybrid compound possesses a chain‐like structure, high chalcogen (S and Se) atom ratios, and enhanced conductivity, capable of serving as a high‐capacity and long‐cycling cathode material for lithium‐organochalcogenide batteries. The 1D linear molecular structure formed through synergistic selenium–sulfur bonding enabled significant enhancement of electrochemical performance via dual mechanisms involving chemical adsorption and electrochemical conversion. Moreover, an array of electrochemical tests and mechanistic analyses verified that this configuration can effectively suppress the shuttle effect during battery cycling and simultaneously enhance material structural stability. The organoselenide‐sulfide hybrid compound cathode exhibited a heightened specific capacity (816.8 mAh g ⁻¹ at 1.0 A g ⁻¹ ) and an improved capacity retention (with a decay of 0.06% per cycle). These dual advantages provide fresh insights into advancing lithium–organochalcogenide battery technology and offer a promising pathway toward their practical implementation.