In-situ construction of edge site-enriched VS4/graphene hybrids toward high-performance lithium storage

In-situ construction of edge site-enriched transition metal sulfides coupled graphene hybrids holds an effective strategy for high-performance lithium-ion storage. Here, a hybrid architecture with edge site-enriched VS4 electroactive species anchored on graphene sheet is tailor-made as an ideal host for Li+via a simple in-situ as-sembly process. The etching effect is an indispensable factor in the formation of hybrid structure with ultra-rich edge sites, which makes a positive contribution to the surface-structure activity. The integrated hybrids not only guarantee a high utilization of electroactive species and fast reaction kinetics, but also open up synergistic electrochemical properties. Thus, the optimized VS4/Graphene electrodes exhibit uplifting specific capacity (1220 mAh g1 at 1 A g1), superb rate (476 mAh g1 at 20 A g1), and excellent cycling durability (100% maintains over 1000 cycles at 10 A g1). In addition, an irreversible amorphous transition and redox reaction mechanism in the first cycle have been revealed. This work is expected to expound a feasible strategy for the progress of energy storage system.

Automated summary

In-situ construction of edge site-enriched transition metal sulfides coupled with graphene hybrids provides an effective strategy for high-performance lithium-ion storage. The optimized electrodes exhibit uplifting specific capacity, superb rate performance, and excellent cycling durability. The irreversible amorphous transition and redox reaction mechanism in the first cycle were revealed, contributing to the progress of energy storage system.