A novel scaly N‐doped carbon/Mo‐doped TiO 2 composite to regulate polysulfides for excellent‐performance lithium‐sulfur batteries

Lithium-sulfur batteries with a high energy density have got eye-catching attention for next-generation energy storage systems. However, their practical application is impeded by the lithium polysulfide shuttle effect causing rapid capacity fading. Herein, a novel scaly N-doped carbon/Mo-doped TiO2 (N-TiO2@Mo) composites as sulfur-wrapping host for lithium-sulfur batteries are prepared. This host not only can physically adsorb polysulfides due to the unique scaly carbon structure with a rough surface and large specific surface area, but also chemically adsorb polysulfides and effectively inhibit the shuttle effect from the Ti-O bond. As cathode for lithium-sulfur battery, 0.2 N-TiO2@Mo/S shows a high-capacity maintenance (70.41%, 83.97%, and 95.04% after 30, 50, and 50 cycles at 0.2, 0.5, and 1 C) and a low-capacity degradation (0.091% per each cycle for 200 cycles). Moreover, the cathode delivers a smallest voltage gap (0.18 V) between oxidation and reduction plateaus and a high Qlow/Qhigh (2.43 at 0.1 C). This work offers a promising avenue and provides a new guide to high-performance lithium-sulfur batteries.