Hierarchical Assembly of CNTs-VSe₂-VO_x/S for Flexible Lithium-Sulfur Batteries

Constructing highly conductive compact sulfur cathode composites with shorter ion diffusivity lengths is vital for achieving comprehensively superior electrochemical performance under a high mass loading condition. Guided by computerization modeling, we, herein, report self-supporting CNTs-VSe₂-VO/S assembly with balanced tortuosity and porosity for flexible Li-S batteries. The resultant hybrid sulfur cathode with a tortuosity of 2.42 and a porosity of 0.44 delivers prominent rate performance and cycling stability with a medium sulfur loading. More importantly, we demonstrate that the pouch cells with a high sulfur loading of 6.0 mg cm^-2 and a low electrolyte to sulfur ratio of 4.2 μL mg^-1 could synchronously deliver high gravimetric/volumetric energy densities of 424.1 Wh kg^-1 and 469.2 Wh L^-1, as well as decent cycling behavior under arbitrary bending conditions, which provides a ponderable reference for future flexible and wearable electronic devices.