Scalable TiO2 embedded sulfur bulks@MnO2 nanosheets composite cathode for long-cyclic lithium-sulfur batteries

Lithium‐sulfur batteries have stimulated great attention as an advanced power system for scale storage requirements due to the overwhelming energy density . However, the capacity degradation caused by polysulfide shuttle and volume expansion still impedes the practical application. Herein, we designed and fabricated a facile TiO 2 embedded sulfur bulks@MnO 2 nanosheets composite as scalable cathode for long-cyclic lithium-sulfur batteries. The TiO 2 nanoparticles were embedded in sulfur bulks, which played important roles in the coverage of the uniform MnO 2 nanosheets. The embedded TiO 2 sites and external MnO 2 nanosheets brought out the physic trapping and chemical synergistic encapsulation of polysulfides. Such a composite cathode exhibited high reversible capacity of 1289 mAh g −1 at 0.1 C and long-term cycling stability at high rate condition (430 mAh g ‐1 after 500 cycles at 2 C). This work thus sheds new light on a scalable way to improve the electrochemical performance of sulfur cathode.