Efficient CuO coating on assembled Cu₂V₂O₇nanoflakes for better lithium storage performance.

Area of Science:

• Materials Science
• Electrochemistry
• Nanotechnology

Background:

• Metal vanadates offer high theoretical capacity for lithium storage but suffer from poor cycle stability due to structural reconstruction during lithiation.
• Developing stable and high-performance anodes is crucial for advancing next-generation lithium-ion batteries.

Purpose of the Study:

• To synthesize and investigate a Cu2V2O7 nanoflake architecture on a conductive carbon scaffold for enhanced lithium storage.
• To explore the impact of thermal treatments on the material's morphology and electrochemical performance.
• To understand the role of the in-situ generated CuO phase in improving anode stability and capacity.

Main Methods:

• Coupled hydrothermal-annealing synthesis of Cu2V2O7 nanoflakes on a doped graphitic carbon scaffold.
• Systematic investigation of varied thermal treatment conditions.
• Electrochemical characterization including cycling performance and rate capability tests.

Main Results:

• The synthesized C@Cu2V2O7 hybrid anode exhibits a reversible capacity of 997.4 mAh g-1 after 150 cycles at 0.1 A g-1.
• Excellent long-term cycling stability was achieved, with 366.07 mAh g-1 maintained after 2000 cycles at 2 A g-1.
• Remarkable capacity retention of 56.36% was observed after 8000 cycles, highlighting the material's durability.

Conclusions:

• The in-situ generation of a secondary CuO phase effectively mitigates structural reconstruction and enhances lithium storage kinetics.
• The developed C@Cu2V2O7 hybrid anode demonstrates superior electrochemical performance compared to traditional metal vanadates.
• In-situ growth of protective oxide layers is a promising strategy for designing high-performance metal vanadate anodes.