Preparation of lamellar structure MoS2@rGO/S and its energy storage performance

Aiming at the lithium polysulfides’ shuttle effect, elemental sulfur’s poor conductivity, and large volume changes in the lithium sulfur battery (LSB), the petal MoS 2 (high adsorption to lithium polysulfides) and reduced graphene oxide (rGO, excellent conductivity, and structural stability) were introduced in the LSB. MoS 2 @rGO was prepared by growing MoS 2 in situ on the surface of graphene oxide (GO). MoS 2 @rGO/S cathode material was prepared by thermally melting sulfur on MoS 2 @rGO. Morphological structure and electrochemical properties of the samples were characterized. The results show that the prepared MoS 2 is a petal-like structure and grows in situ on the GO. The composite MoS 2 @rGO/S shows a lamellar structure and an excellent electrochemical performance: its first discharge specific capacity is up to 1243.3 mAh g −1 at 0.1 C. Even at 3 C, its discharge specific capacity is 732.0 mAh g −1 . Its capacity decay rate for 200 cycles at 0.5 C is only 0.09%.