Coral structure nano micro-mesoporous sphere as an effective host for Li-S batteries

To enhance the gravimetric specific capacity of Lithium-Sulfur battery electrodes, it is significant to develop a host material capable of accommodating sufficient sulfur. This host not only provides a space for binding of Li and S elements, but also effectively suppresses the dissolution of lithium polysulfide in the electrolyte, avoiding capacity loss. Herein, a composite carrier consisting of CeO 2 nanoparticles, sulfur, and Ti 3 C 2 T F was prepared through the hydrothermal method and the ball-milling method. This hierarchical structure enables efficient sulfur entrapment and dynamic storage. Benefiting from these structural advantages, the composite with 60.2 wt% sulfur exhibits an outstanding initial discharge capacity of 1714.57 mAh g ‐1 at 1C. Remarkably, after 1000 cycles, it maintains a reversible capacity of 1714.41 mAh g ‐1 , corresponding to a capacity retention of 99.94%. The composite material incorporating carbon nanotubes (CNTs) offers a higher initial discharge capacity (2211.28 mAh g ‐1 ), yet under identical cycling conditions, its capacity retention rate is 99.92% (2209.55 mAh g ‐1 ).