The Preparation of Porous CuO@F-GDY Nano-Arrays for High-Performance Sodium-Ion Battery Anodes

Area of Science:

• Materials Science
• Electrochemistry
• Energy Storage

Background:

• Growing demand for efficient energy storage necessitates advanced anode materials for sodium-ion batteries (SIBs).
• Existing anode materials face challenges in capacity, stability, and accommodating volume changes during cycling.
• Fluorinated graphdiyne (F-GDY) shows promise as a conductive support and structural template.

Purpose of the Study:

• To design and synthesize a novel porous CuO@F-GDY composite anode for high-performance SIBs.
• To investigate the synergistic effects of F-GDY confinement and CuO structure on electrochemical properties.
• To evaluate the cycling stability and sodium storage mechanism of the developed anode material.

Main Methods:

• Fabrication of porous CuO@F-GDY composite via a F-GDY coating-guided strategy.
• Characterization of material morphology, structure, and composition using advanced techniques.
• Electrochemical performance evaluation including cyclic voltammetry, galvanostatic cycling, and rate capability tests.

Main Results:

• The F-GDY shell facilitated the formation of a porous CuO structure with preserved morphology.
• The composite anode demonstrated high reversible capacity (681 mAh g^-1 at 50 mA g^-1) and excellent long-term cycling stability (278 mAh g^-1 at 2000 mA g^-1 after 1250 cycles).
• Mechanistic studies revealed a predominantly capacitive sodium storage process with a high ionic diffusion coefficient.

Conclusions:

• The porous CuO@F-GDY composite anode effectively accommodates volume fluctuations and enhances interfacial charge transfer.
• The synergistic interaction between CuO and F-GDY significantly improves electron transport and sodium ion adsorption.
• This study presents a promising strategy for developing high-stability anode materials for next-generation SIBs.