Hierarchical Assembly of CNTs-VSe<sub>2</sub>-VO<sub>x</sub>/S for Flexible Lithium–Sulfur Batteries
Jing Qi, Tianli Wu, Mengyao Xu, Zhubing Xiao
Abstract
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-VSe 2 -VO x /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.