From bricks to walls: Crafting vanadium trioxide complex structures for enhanced lithium-ion battery performance

Abstract

Hollow structures with large surface areas are recognized as promising electrode materials for lithium-ion batteries. Inspired by the construction of brick walls, we have developed a novel, low-melting-point salt-assisted strategy for the assembly of V₂O₃-coated CoO/Co complex hollow nanocubes. The shell thickness of these hollow nanocubes can be precisely controlled by adjusting the quantities of raw materials. An optimal V₂O₃ shell thickness enhances reaction reversibility and stability, while minimizing overpotential due to the accelerated reaction rate at the electrode interface. This unique structure not only withstands volume expansion and extraction but also significantly improves the energy density and reduces resistance during cycling. These attributes demonstrate exceptional lithium storage properties, making them ideal anode materials for lithium-ion batteries.