MoS2 nanoflowers implanted in nitrogen-doped carbon fibers with Fe2O3 nanoparticles decorated for enhanced lithium storage performance

作者：Chen, Xuemei; Zhang, Qi; Wang, Hu; Wang, Liu^*; Wang, Heng; Zeng, Yaping^*

来源：Journal of Alloys and Compounds, 2023, 963: 171195.

DOI：10.1016/j.jallcom.2023.171195

• Lithium-ion batteries
• Carbon fibers
• MoS2 nanoflowers
• Anode materials

MoS2 has attracted extensive attention due to its unique two-dimensional layered structure and high theoretical capacity. Unfortunately, the large volume variation and sluggish lithiation kinetics during charging/discharging result in low-rate capability and poor cyclic stability. To solve those issues, MoS2/Fe2O3 @ carbon fiber (CNF) composite was designed delicately by implanting MoS2 nanoflowers in nitrogen-doped carbon fibers with Fe2O3 nanoparticles decorated. The carbon nano-fibers served as a holder to accommodate the volume expansion of MoS2 and provide a high-speed channel for electron transport, while Fe2O3 nanoparticles are apt to form heterojunction with MoS2, producing an internal electric field to enhance the ionic dynamic. As a result, the optimized sample, denoted as MoS2/Fe2O3 @CNF-3, exhibits high first discharge capacity of similar to 1370 mAh g(-1) at 50 mA g(-1) and excellent cycle performance (559.74 mAh g(-1) after 500 cycles at 1 A g(-1), with capacity retention rate of 71.6%). In summary, the design techniques of heterojunction building and carbon encapsulation can be applied to different energy storage materials and have significant potential for enhancing lithium-ion battery performance electrochemically.

• 单位
  桂林理工大学