Synthesis of Copper Oxide/Graphite Composite for High-Performance Rechargeable Battery Anode

Area of Science:

• Materials Science
• Electrochemistry
• Nanotechnology

Background:

• Developing high-performance anode materials is crucial for advancing lithium-ion and sodium-ion battery technology.
• Existing anode materials often face limitations in capacity, cycle stability, and ion intercalation efficiency.

Purpose of the Study:

• To propose and synthesize a novel copper oxide/graphite composite (GCuO) anode.
• To investigate the structural and electrochemical properties of the GCuO composite for battery applications.
• To evaluate the performance of GCuO in both half-cell and full-cell configurations.

Main Methods:

• A one-step synthesis method involving heat treatment of a copper ion complex and graphite.
• Material characterization using techniques to analyze nanoparticle formation and graphite layer expansion.
• Electrochemical testing of GCuO in lithium-ion battery half-cells and a lithium iron phosphate (LiFePO4)/GCuO full cell.

Main Results:

• The synthesis resulted in copper oxide nanoparticles and expanded graphite interlayers (0.34 to 0.40 nm).
• The GCuO anode demonstrated a high capacity of 532 mAh/g at 0.2 C with 83% retention after 250 cycles in a Li-ion half-cell.
• A LiFePO4/GCuO full cell achieved a capacity of 70 mAh/g with 99% coulombic efficiency.

Conclusions:

• The GCuO composite exhibits excellent electrochemical performance, including high capacity and long cycle stability.
• The expanded graphite structure facilitates effective ion intercalation, crucial for reversible battery operation.
• GCuO is a promising anode material for next-generation lithium-ion and sodium-ion batteries.