Nickel Vanadium Oxyphosphide Nanosheets with Synergistic Metal–Phosphide Interfaces for Fast and Durable Lithium Storage

Achieving high capacity, long-term stability, and fast charge–discharge capability remains a central challenge in the development of advanced anode materials for lithium-ion batteries. In this work, we present nickel vanadium oxyphosphide (NVOP) nanosheets synthesized via controlled thermal phosphorization of NiV-layered double hydroxide (NiV-LDH). The resulting multiphase structure, composed of conductive Ni₂P and redox-active vanadium oxides, delivers an initial discharge capacity of 1345-mAh/g and retains 442-mAh/g after 200 cycles at 0.1-A/g, with Coulombic efficiency stabilizing near 99.5%. NVOP also demonstrates excellent rate performance, maintaining 359-mAh/g at a high current density of 1.0-A/g. Electrochemical and structural characterization suggest that the improved cycling stability and rate capability may stem from the multiphase architecture, which integrates conductive and redox-active components within a porous nanosheet framework. These findings underscore the potential of direct phosphorization of mixed-metal layered hydroxide precursors as an effective strategy for constructing high-performance, durable anode materials for next-generation lithium-ion batteries.