Two‐Step Synthesis of Hierarchical Dual Few‐Layered Fe3O4/MoS2 Nanosheets and Their Synergistic Effects on Lithium‐Storage Performance

Abstract

AbstractOwing to unique lamellar nanostructures, 2D inorganic materials are considered as promising candidates in energy storage and conversion. In this paper, a facile two‐step synthesis is developed to fabricate 3D hierarchical dual Fe3O4/MoS2 nanosheets (HD‐FMNs), in which few‐layered MoS2 nanosheets are anchored in 3D Fe3O4 nanosheet network to form the heterojunction structure. Furthermore, it is proved that the synergistic effects on both electron/lithium‐ion transport kinetics and mechanical cycling stability benefit from Fe3O4/MoS2 nanosheet incorporation in 3D HD‐FMN anode for lithium‐ion batteries (LIBs), resulting in the dramatically enhanced performance. The Fe3O4 nanosheet incorporation effectively improves the electronic conductivity due to its half‐metal characteristic, while the defect‐rich structure in the MoS2 nanosheets can facilitate the lithium ion transport. When tested as potential anode materials, 3D HD‐FMNs exhibit a high reversible capacity (650 mAh g−1) at current rate of 5 C (1 C = 1 A g−1) after superior long‐term cycles (1000 times), as well as an excellent rate capability even at high current rates. The outstanding electrochemical property of 3D HD‐FMNs allows their application in high‐performance anode materials for next‐generation LIBs. This strategy also opens a new way to design the novel 2D composite materials for electrochemical devices.