Design and Construction of Carbon-Coated Bimetallic Selenide Heterostructures Loaded on Reduced Graphene Oxide Substrate for Superior Lithium-Ion Storage

In this work, carbon-coated bimetallic tin-nickel selenide heterostructures loaded on reduced graphene oxide composites were prepared through a metal-organic framework-assisted strategy. The carbon coating mitigates the volume expansion and maintains the structural stability, while the introduction of reduced graphene oxide and heterojunction enhances electrical conductivity and reaction kinetics, thereby together contributing to the enhanced lithium-ion storage performance. As expected, the optimal material delivers excellent lithium-ion storage performance in terms of a high reversible capacity of 1033.4 mAh g^-1 at 0.2 A g^-1, outstanding rate capability, and long-term cyclability with the capacity of 726.2 mAh g^-1 after 500 cycles at 1.0 A g^-1 and 452.4 mAh g^-1 after 1000 cycles at 2.0 A g^-1. Furthermore, the electrochemical reaction mechanism of the composite is analyzed.