Edge-enriched MoS2@C/rGO film as self-standing anodes for high-capacity and long-life lithium-ion batteries

Restraining the aggregation and polysulfide dissolution of edge-enriched metal sulfides is of significance for their applications as anode materials of lithium-ion batteries (LIBs) with high capacity and long cycle-life. In this work, we have reported the incorporation of MoS2 nanocrystals into amorphous carbon on the surface of reduced graphene oxide (rGO) by balancing the decomposition rates of phenolic resin (PF)-impregnated ammonium thiomolybdate (ATM), which subsequently forms the MoS2@C/rGO film through redispersion and vacuum filtration. Such structural design effectively avoids the aggregation of MoS2 nanocrystals and Li2S loss, and meanwhile ion enrichment in amorphous carbon and diffusion reinforcement can greatly accelerate the electrochemical reaction kinetics. When applied as the self-standing anode, the MoS2@C/rGO film possesses high reversible capacities of 1164 mA h g(-1) at the current density of 0.2 A g(-1) and 810 mA h g(-1) at 6.4 A g(-1). It also exhibits quite a high capacity retention after 1000 cycles at 3.2 A g(-1). This work develops the formation theory of incorporation structures and promotes their applications in energy storage devices.

Automated summary

Balancing the decomposition rates of chemicals, such as phenolic resin and ammonium thiomolybdate, allowed the successful synthesis of MoS2 nanocrystals on the surface of reduced graphene oxide, forming the MoS2@C/rGO film that effectively prevents aggregation and loss of Li2S. The structural design greatly accelerates electrochemical reaction kinetics and promotes high capacity retention in energy storage devices.