MoSe2 nanosheets-wrapped flexible carbon cloth as binder-free anodes for high-rate lithium and sodium ion storages

Layered two-dimensional MoSe 2 has raised much interest in lithium/sodium ion batteries (LIBs/SIBs) due to its unique structure and high theoretical capacity. In this work, we have fabricated MoSe 2 @carbon cloth (MoSe 2 @CC) composites through an in situ hydrothermal approach followed by an annealing treatment. The as-synthesized MoSe 2 @CC composites are constructed by MoSe 2 nanoflowers anchored on CC network, which can be directly used as binder-free anodes for LIBs and SIBs. As an anode for LIBs, the MoSe 2 @CC performs excellent rate capacity (1337, 1092, 952, 831 and 749 mAh g −1 at current densities of 0.1, 0.2, 0.5, 1.0, and 2.0 A g −1 ) and super long-life cycling stability (638 mAh g −1 remains after 1200 cycles at 5 A g −1 ). As for SIBs, the MoSe 2 @CC electrode delivers a high initial discharge capacity of 839 mAh g −1 and excellent long-life cycling stability, retaining 202 mAh g −1 after 1000 cycles. Kinetics results indicate that the Li + and Na + storages in MoSe 2 @CC are both dominated by surface-based pseudocapacitive process, which greatly improves the rate performance of LIBs/SIBs. The CC provides a conductive network and an excellent utilization rate of the active material MoSe 2 to improve the electrochemical performance.