Three-Dimensional Hierarchical MoSe2/N, F Co-Doped Carbon Heterostructure Assembled by Ultrathin Nanosheets for Advanced Lithium-Ion Batteries

MoSe2 has attracted great interest as an anode material for lithium-ion batteries (LIBs) thanks to its high capacity. Nevertheless, the poor cycle performance caused by the huge volume change during the lithiation/delithiation process seriously limits its practical application in LIBs. Herein, a 3D hierarchical MoSe2/N, F co-doped carbon (MoSe2/NFC) heterostructure is prepared via a simple method. Notably, the N, F co-doped heterostructure can expand the (002) plane of MoSe2, which contributes in facilitating Li+ insertion/extraction. Furthermore, N, F co-doped carbon confined MoSe2 nanosheets to form a 3D hierarchical heterostructure, leading to fast electron/ion transfer, buffering of the volume change, and prevention of the aggregation of MoSe2 nanosheets during the repeated discharge/charge process. Therefore, the MoSe2/NFC composite exhibits good rate performance and ultra-long cycling life when applied in LIBs. A high capacity of 452.9 mAh g(-1) is maintained at 5 A g(-1), and a high capacity of 598.3 mAh g(-1) is obtained after 1000 cycles at 2 A g(-1).