MoS2 self-embedded in pleated carbon pyrolyzed by ionic liquids as a high-performance anode materials for lithium-/sodium-ion batteries

MoS 2 is a promising anode with high theoretical capacity in lithium-/sodium-ion batteries. Nevertheless, the unstable structure and poor conductivity of MoS 2 limit its practical applications. Herein, a carbon layer-coated MoS 2 composite (MoS 2 /C) is synthesized by a pyrolysis strategy, in which ionic liquid-derived carbon improves the conductivity and structural stability of composites by wrapping MoS 2 . When MoS 2 /C composite is used as anode in lithium-/sodium-ion batteries, it exhibits excellent stability, high capacity and long cycle life. After 50 cycles at 100 mA g −1 , the lithium storage capacity of the MoS 2 /C composite is more than 760 mAh g −1 , and the sodium storage capacity reaches 480 mAh g −1 . When the current density is 2 A g −1 , the sodium storage capacity maintains at 355 mAh g −1 after 500 cycles. Even after 1000 cycles, it still exhibits a stable lithium storage capacity of 350 mAh g −1 at the current density of 4 A g −1 . The improved performance of MoS 2 /C composite can be explained by its stable structure and high charge mobility.