Flower-like molybdenum disulfide/carbon nanotubes composites for high sulfur utilization and high-performance lithium–sulfur battery cathodes

• Published in: Applied surface science Vol. 473; pp. 540 - 547
• Main Authors: Walle, Maru Dessie, Zeng, Ke, Zhang, Mengyuan, Li, Yajuan, Liu, You-Nian
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 15.04.2019
• Subjects: Cathode; Flower-like MoS2; Lithium-sulfur battery; Sulfur utilization; Flower-like MoS2; Lithium-sulfur battery; Sulfur utilization; Cathode
• ISSN: 0169-4332; 1873-5584
• DOI: 10.1016/j.apsusc.2018.12.169

•Flower-like MoS2/CNTs-S composites with mesoporous structures for Li–S batteries were prepared.•The flower-like MoS2 NPs act as hosts of sulfur and have strong affinity toward polysulfides.•The MoS2/CNTs-S cathode exhibits a high reversible capacity of 855.5 mA h g−1 with 88.0% sulfur utilization. Lithium–sulfur (Li–S) batteries have attracted an increasing attention for advanced energy storage devices, because of their high energy density, low cost and lower environmental impacts. However, their commercial applications are still hampered with the low conductivity and sulfur utilization, the low sulfur loading and the serious capacity fading at a high current rate. Herein, we prepared flower-like molybdenum disulfide and carbon nanotubes (MoS2/CNTs) composites with mesoporous structures for high sulfur utilization cathodes. The flower-like MoS2 can immobilize sulfur and obstruct the solubility of polysulfide within the structures. The MoS2/CNTs-S cathode with 2.6 mg cm−2 sulfur loading and capacity per area of 3.83 mA h cm−2 delivers an initial specific discharge capacity of 1473 mA h g−1 with 88.0% sulfur utilization and maintains a reversible capacity of 855.5 mA h g−1 with coulombic efficiency up to 96.6% after 50 cycles at the current rate of 0.2 C (335.0 mA g−1). Impressively, the MoS2/CNTs-S cathode at 5 C shows the high specific capacity of 1254 mA h g−1 with 76.0% sulfur utilization and maintains 384.0 mA h g−1 with an average coulombic efficiency of 91% after 200 cycles. The MoS2/CNTs-S cathode could be a good candidate for high-performance Li–S battery.