Metal–Organic Frameworks-Derived Biphasic Selenide Heterostructures Wrapped with Nitrogen-Doped Carbon Nanotubes for Robust Lithium Storage

Metal–organic frameworks (MOFs) are widely used as anode materials for lithium-ion batteries (LIBs) because of their high specific surface areas and rich surface-active sites. However, their poor electronic conductivity and structural durability severely hamper the rapid transport of Li ions, leading to poor electrochemical performance and rapid capacity fading. Herein, we rationally designed biphasic nickel-selenide heterostructures wrapped with nitrogen-doped carbon nanotubes (Ni3Se4/NiSe@NC) using MOF nanotubes as a template and a dopamine agent as a nitrogen-doped carbon coating source. The well-constructed Ni3Se4/NiSe@NC electrode delivered a reversible specific capacity of 452.1 mAh g-1 in a half cell after 3000 cycles at 10000 mA g-1 and a specific capacity of 436.2 mAh g-1 in a full cell after 200 cycles at 200 mA g-1. The outstanding performance of Ni3Se4/NiSe@NC can be attributed to its robust tubular structure, large specific surface area, uniform N-doped carbon decoration, and novel heterostructure. This design provides an avenue to manufacture biphasic anode materials with desirable structures for high-performance LIBs.